3M EVM Series User manual

3M Occupational Health & Environmental Safety Division
3MTM EVM Series Environmental Monitor
Particulate
Simultaneous
and Gas
User Manual
Concentration Measurement
Distributed by:
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Dangers, warnings, & cautions
ii
3MTM EVM series environmental monitor
Dangers, warnings, & cautions
Danger!
Failure to observe the following procedures may result in serious personal injury:
 Not for use in Explosive or Hazardous locations. This product is NOT Intrinsically Safe.
 Contains built-in lithium ion battery pack. Do not incinerate or dispose of in fire.
 Do not disassemble, alter, or re-construct the li-ion battery.
 Contains Class 3b visible laser radiation source (658 nm, nominal 5 mW). Do not look directly into
beam or view with telescopic devices.
 This instrument will NOT detect natural gas.
Warning!
 Read the manual before operation.
 Do not store in temperatures exceeding 60°C (140°F) and in direct sunlight.
 Do not immerse in liquids.
 The Sensors and batteries in this instrument have limited shelf-life, even if never used.
 Do not disassemble, service, or clean the optical engine internal components while power is applied.
The laser source can hurt you.
Caution!
General
 Condensation may damage your instrument and its sensors.
 A non-condensing environment is required for proper measurements.
 Do not charge batteries outside the range of 0°C to 40°C (32°F to 104°F).
 Battery run-time may be somewhat reduced at lower than 20°C (68°F) temperatures.
Temp/RH/Dew Point
 The internal Temp/RH sensor in this instrument is not designed for use in bright sunlight or in the
presence of a strong radiant heat sources. It is intended primarily for indoor use. It is not equivalent to
a protected dry-bulb thermometer.
PM/dust
 Clean the optical engine mirror with a soft cloth, if it is dirty. Scratches will affect performance.
 Avoid measuring wet particles, fogs, and liquid mists that will tend to cling to the impactor, optical engine,
tubing, and pump surfaces.
 Avoid oily mists as found near some machining operations.
 This monitor is designed to measure dry particulates, not filaments.
 Do not attempt to measure Asbestos with this instrument.
 Keep a "Pump Protection Filter" or other gravimetric filter in place to help prolong the life of the pump.
 You must check & calibrate the flow rate, when using this device as a (gravimetric) sampling pump.

Dangers, warnings, & cautions (continued)
iii
Dangers, warnings, & cautions (continued)
Caution!
CO2
 Avoid exposure to condensation, fogs, and liquid mists, that can contaminate the optical path inside the
CO2 sensor.
PID
 This instrument cannot detect methane gas.
 For best sensor life, avoid acidic condensing gases.
 The presence of moisture can affect performance of the PID.
Toxic
 Beware of certain cross-sensitivities when measuring toxic gas levels. Readings can be nonspecific in
the presence of certain cross-contaminant gases.
Air velocity
 The tip of the Air velocity probe is very fragile.
FCC Compliance Statement
 This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial or residential environment. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications. If harmful interference
occurs, the user will be required to correct the interference at his or her expense.

Table of Contents
iv
Table of Contents
Dangers, warnings, & cautions ........................................................................................................................................................................ii
Chapter 1: Introduction .....................................................................................................................................................................................1
Particulate sampling (Aerosols/dust vapors) .................................................................................................................................................2
Particulate path..............................................................................................................................................................................................2
Particulate sizes.............................................................................................................................................................................................3
Particulates and cut-point ..............................................................................................................................................................................4
Collecting/sensing the particulates................................................................................................................................................................4
Gravimetric sampling .....................................................................................................................................................................................4
Pump..............................................................................................................................................................................................................4
Gas sensors sampling.......................................................................................................................................................................................5
Gas sensors and path....................................................................................................................................................................................5
Volatile organic compounds (VOC’s) sampling .............................................................................................................................................6
Temperature, Relative humidity, Dew Point....................................................................................................................................................6
What the standards say.....................................................................................................................................................................................6
Resources......................................................................................................................................................................................................7
EVM Series..........................................................................................................................................................................................................7
Applications....................................................................................................................................................................................................7
Models explained...........................................................................................................................................................................................9
Chapter 2: Getting started...............................................................................................................................................................................11
Checking the equipment .................................................................................................................................................................................11
Display and keypad .........................................................................................................................................................................................12
Diagram........................................................................................................................................................................................................12
Keypad description ......................................................................................................................................................................................13
Turning on.........................................................................................................................................................................................................14
Start screen explanation..............................................................................................................................................................................14
Navigating ....................................................................................................................................................................................................15
Indicators/Icons on the display ....................................................................................................................................................................15
Turning off ........................................................................................................................................................................................................16
Instrument Information....................................................................................................................................................................................16
Unit information screen................................................................................................................................................................................16
3MTM Detection Management Software DMS.................................................................................................................................................18
Communicating................................................................................................................................................................................................18
Powering and outputs on the EVM..............................................................................................................................................................19
Battery....................................................................................................................................................................................................19
Charging.................................................................................................................................................................................................19
Table of
Contents

Table of Contents
v
Outputs...................................................................................................................................................................................................19
Chapter 3:Setting up the EVM ........................................................................................................................................................................21
Setting up parameters via the keypad...........................................................................................................................................................21
Time and date setting ..................................................................................................................................................................................21
Checking battery power ...............................................................................................................................................................................22
Display: language, contrast, & key click .....................................................................................................................................................24
Setting logging and viewing run time...........................................................................................................................................................25
PID correction –adding/editing....................................................................................................................................................................27
Changing units (temperature, particulates, PID, and air velocity)...............................................................................................................29
Setting up particulate settings......................................................................................................................................................................30
Setting profiles (particulate correction factors) ............................................................................................................................................30
How particulate factors are adjusted and calculated...................................................................................................................................30
Dust correction factors (profiles)............................................................................................................................................................31
Particulate pump: enable or disable ............................................................................................................................................................33
Resetting the gravimetric filter .....................................................................................................................................................................33
Auxiliary input/output....................................................................................................................................................................................34
Digital output..........................................................................................................................................................................................34
Air Velocity ...................................................................................................................................................................................................36
Analog-out....................................................................................................................................................................................................37
Restoring default factory settings ................................................................................................................................................................38
Backlight setting...........................................................................................................................................................................................39
Resetting the EVM.......................................................................................................................................................................................39
Lock/secure run and/or setup ......................................................................................................................................................................40
Unlock run and/or setup...............................................................................................................................................................................41
Auto-run .......................................................................................................................................................................................................42
Auto-run and timed-run mode................................................................................................................................................................42
Auto-run with date mode........................................................................................................................................................................43
Auto-run with day of week (DOW) mode...............................................................................................................................................45
Chapter 4: Calibrate sensors.........................................................................................................................................................................47
Placement and calibration of sensors...........................................................................................................................................................47
Inserting and removing sensors...................................................................................................................................................................47
Calibrating particulates ................................................................................................................................................................................49
Impactor and use .........................................................................................................................................................................................49
Adjusting the impactor/turret setting............................................................................................................................................................50
Particulates calibration (zero cal).................................................................................................................................................................52
Particulate Advanced Calibration (Gravimetric) ..........................................................................................................................................56
Gravimetric Calibration Overview ..........................................................................................................................................................56
Performing a gravimetric calibration............................................................................................................................................................57
Pump flow rate calibration ...........................................................................................................................................................................58
Toxic gas sensors........................................................................................................................................................................................59
Cross sensitivity ...........................................................................................................................................................................................60
How sensors operate.............................................................................................................................................................................60
Quality calibrations.......................................................................................................................................................................................60
About sensors and cal storage ....................................................................................................................................................................61
Calibration history and sensor serial numbers ............................................................................................................................................61
Applying a gas sensor..................................................................................................................................................................................62
Calibrating toxic gas sensors.......................................................................................................................................................................63
Toxic gas zero calibration......................................................................................................................................................................63
Ozone calibration for zero and span......................................................................................................................................................63
Toxic gas span calibration .....................................................................................................................................................................65

Table of Contents
vi
Calibrating CO2 AND O2..............................................................................................................................................................................67
CO2Accuracy.........................................................................................................................................................................................67
O2 Accuracy............................................................................................................................................................................................67
Calibrating Photo-Ionization Detector (PID) Sensor....................................................................................................................................71
PID parts per million (ppm) zero calibration ..........................................................................................................................................71
PID parts per billion (ppb) zero calibration ............................................................................................................................................71
PID span calibration...............................................................................................................................................................................72
Calibrating relative humidity and temperature.............................................................................................................................................74
Calibration history ........................................................................................................................................................................................76
Verify calibration and drifting analysis .........................................................................................................................................................77
Chapter 5: Measuring and Viewing...............................................................................................................................................................80
Overview of running a session.......................................................................................................................................................................80
Measuring .........................................................................................................................................................................................................81
Understanding what data is stored ..............................................................................................................................................................81
Summary data........................................................................................................................................................................................81
Logged data/ Time history ...........................................................................................................................................................................81
Running and stopping.....................................................................................................................................................................................82
Measurement screens and navigation...........................................................................................................................................................83
Unit defined..................................................................................................................................................................................................84
About the measurement softkeys ................................................................................................................................................................85
Particulate measurement screen ...................................................................................................................................................................86
Impactors and particulate measuring ..........................................................................................................................................................87
Extending run-time for PM measurements..................................................................................................................................................87
Changing particulate measurements...........................................................................................................................................................88
Relative humidity & temperature measurements.........................................................................................................................................89
Relative humidity and temperature screen..................................................................................................................................................89
Gas measurements..........................................................................................................................................................................................90
Gas screen...................................................................................................................................................................................................90
Composite measurement................................................................................................................................................................................90
Composite screens ......................................................................................................................................................................................91
Air velocity meaursurement screen...............................................................................................................................................................92
Summary Data..................................................................................................................................................................................................93
Viewing details in the measurement screen................................................................................................................................................93
Trend Data ........................................................................................................................................................................................................93
Viewing trend data in the measurement screen..........................................................................................................................................94
Past session .....................................................................................................................................................................................................95
Summary data screen..................................................................................................................................................................................95
File System menu.............................................................................................................................................................................................97
Deleting sessions individually......................................................................................................................................................................97

Table of Contents
vii
Delete all sessions.......................................................................................................................................................................................98
Memory remaining and file properties .........................................................................................................................................................99
Estimated Run Time ..................................................................................................................................................................................100
Chapter 6: DMS (Software)...........................................................................................................................................................................101
EVM Communication .................................................................................................................................................................................101
Downloading data with the EVM................................................................................................................................................................102
EVM: Viewing Data.........................................................................................................................................................................................102
Selecting a session/study ..........................................................................................................................................................................102
EVM panel layout view (PLV) page...........................................................................................................................................................103
EVM Reports and Printing.............................................................................................................................................................................104
Customizing reports...................................................................................................................................................................................105
EVM Setup.................................................................................................................................................................................................106
Saving and sending configurations......................................................................................................................................................106
General EVM setup....................................................................................................................................................................................106
EVM general parameters table............................................................................................................................................................107
EVM and logging settings..........................................................................................................................................................................107
EVM logging parameters table ............................................................................................................................................................108
Figure 6-9: Logging EVM setups EVM and auto-run setting....................................................................................................................108
EVM and auto-run setting..........................................................................................................................................................................109
Timed-Run and auto-run setting..........................................................................................................................................................109
Date and auto-run setting ....................................................................................................................................................................109
Day of week and auto-run setting........................................................................................................................................................110
EVM and security settings .........................................................................................................................................................................111
EVM and triggering settings.......................................................................................................................................................................111
EVM and particulate settings.....................................................................................................................................................................113
EVM and Particulates setup ................................................................................................................................................................113
Chapter 7: Maintenance & cleaning............................................................................................................................................................115
Overview .........................................................................................................................................................................................................115
PID sensor .................................................................................................................................................................................................115
Removing and installing PID sensor..........................................................................................................................................................116
Maintenance and cleaning overview of PID ..............................................................................................................................................117
Cleaning PID sensor..................................................................................................................................................................................117
Optical Engine: maintenance and cleaning ...............................................................................................................................................120
Impactor care..................................................................................................................................................................................................123
Impactors and when to clean.....................................................................................................................................................................124
Gravimetric cassette and filter paper ..........................................................................................................................................................125
Appendix A: Specifications .........................................................................................................................................................................126
Replacement and optional parts ..................................................................................................................................................................136
Appendix B: Customer service ...................................................................................................................................................................138
Contacting 3M Quest Tecnologies Instrumentation ..................................................................................................................................138
International customers..............................................................................................................................................................................138
Calibration ......................................................................................................................................................................................................138

List of Figures
viii
Warranty..........................................................................................................................................................................................................139
Appendix B: Glossary of Terms..................................................................................................................................................................140
Appendix C: PID sensor and correction factors tables............................................................................................................................146
Appendix D: FAQ’s; particulate measurements........................................................................................................................................158
Appendix E: System errors displayed on the EVM series .......................................................................................................................163
List of Figures
Figure 1-1: Particulate path diagram.................................................................................................................................................................................................... 2
Figure 1-2: Particulates and diameter size .......................................................................................................................................................................................... 3
Figure 2-1: Identifying your equipment............................................................................................................................................................................................... 11
Figure 2-2: EVM keypad and display explained ................................................................................................................................................................................ 12
Figure 2-3: Start screen defined......................................................................................................................................................................................................... 14
Figure 2-4: Unit Information screen.................................................................................................................................................................................................... 16
Figure 2-5: Selecting Unit Info. Sensors ............................................................................................................................................................................................ 17
Figure 2-6: Viewing installed sensors ................................................................................................................................................................................................ 17
Figure 2-7: Communicating with QSP-II via USB cable .................................................................................................................................................................... 18
Figure 2-8: USB, power jack and digital output port .......................................................................................................................................................................... 19
Figure 3-1: Time-Date screen parameters ......................................................................................................................................................................................... 22
Figure 3-2: Start screen ...................................................................................................................................................................................................................... 23
Figure 3-3: Battery screen .................................................................................................................................................................................................................. 23
Display: language, contrast, & key click............................................................................................................................................................................................. 24
Figure 3-4: Screen display settings.................................................................................................................................................................................................... 25
Figure 3-5: Logging screen................................................................................................................................................................................................................. 27
Figure 3-6: Estimated run time for logging screen............................................................................................................................................................................. 27
Figure 3-7: PID correction factor ........................................................................................................................................................................................................ 28
Figure 3-8: PID correction factor displayed on measurement screens ............................................................................................................................................. 28
Figure 3-9: Units screen ..................................................................................................................................................................................................................... 29
Figure 3-10: Edit profiles for dust calibration ..................................................................................................................................................................................... 31
Figure 3-11: Entering a profile for particulate calibration................................................................................................................................................................... 32
Figure 3-12: Particulate setup screen ................................................................................................................................................................................................ 34
Figure 3-13: Configuring digital output ............................................................................................................................................................................................... 35
Figure 3-14: Air Velocity setting ......................................................................................................................................................................................................... 36
Figure 3-15: Analog out results with temperature as output.............................................................................................................................................................. 37
Figure 3-16: Analog-Out screen ......................................................................................................................................................................................................... 37
Figure 3-17: Defaults screen (restoring factory settings)................................................................................................................................................................... 38
Figure 3-18: Restoring default calibrations ........................................................................................................................................................................................ 38
Figure 3-19: Backlight key .................................................................................................................................................................................................................. 39
Figure 3-20: Lock Softkey................................................................................................................................................................................................................... 40
Figure 3-21: Setting lock/secure......................................................................................................................................................................................................... 41
Figure 3-22: Selecting auto-run with timed-run mode ....................................................................................................................................................................... 42
Figure 3-23: Setting timed-run and duration ...................................................................................................................................................................................... 43
Figure 3-24: Selecting auto-run with date mode ................................................................................................................................................................................ 44
Figure 3-25: Setting auto-run date mode ........................................................................................................................................................................................... 44
Figure 3-26: Setting auto-run DOW mode ......................................................................................................................................................................................... 45
Figure 4-1: Sensor housing and manifold .......................................................................................................................................................................................... 48
Figure 4-2: Sensors’ locations............................................................................................................................................................................................................ 48
Figure 4-3: How the impactor functions .............................................................................................................................................................................................. 49
Figure 4-4: PM2.5 impactor setting example ..................................................................................................................................................................................... 50
Figure 4-5: Adjusting impactor/turret setting ...................................................................................................................................................................................... 51
Figure 4-6: Particulate zero cal with HEPA filter ................................................................................................................................................................................ 52
Figure 4-7: Selecting calibration screen............................................................................................................................................................................................. 53
Figure 4-8: Particulate cal screen........................................................................................................................................................................................................ 53
Figure 4-9: Particulate calibration and ready screen .......................................................................................................................................................................... 54
Figure 4-10: Particulate calibration and waiting screen...................................................................................................................................................................... 54
Figure 4-11: Particulate calibration pause screen .............................................................................................................................................................................. 55
Figure 4-12: Zero Cal set for Particulates ........................................................................................................................................................................................... 55

List of Figures
ix
Figure 4-13: Reset gravimetric setting ................................................................................................................................................................................................ 57
Figure 4-14: Pump flow rate calibration ............................................................................................................................................................................................. 58
Figure 4-15: Flow Rate Calibration..................................................................................................................................................................................................... 59
Figure 4-16: Calibration history for EVM ............................................................................................................................................................................................ 61
Figure 4-17: Applying a gas sensor.................................................................................................................................................................................................... 62
Figure 4-18: Selecting sensor for calibration process........................................................................................................................................................................ 64
Figure 4-19: Calibration zero screen.................................................................................................................................................................................................. 64
Figure 4-20: Calibration zero pause screen....................................................................................................................................................................................... 65
Figure 4-21: Span Calibration............................................................................................................................................................................................................. 66
Figure 4-22: Saved Calibration screen............................................................................................................................................................................................... 66
Figure 4-23: Selecting a calibration sensor........................................................................................................................................................................................ 68
Figure 4-24: Calibration CO2 ready screen ....................................................................................................................................................................................... 69
Figure 4-25: Setting CO2Span Cal screen ........................................................................................................................................................................................ 70
Figure 4-26: Saved Calibration........................................................................................................................................................................................................... 70
Figure 4-27: Selecting PID sensor for calibration process ................................................................................................................................................................ 72
Figure 4-28: Calibration mode screen................................................................................................................................................................................................ 72
Figure 4-29: PID Calibration Span softkey......................................................................................................................................................................................... 73
Figure 4-30: Saved Calibration screen............................................................................................................................................................................................... 74
Figure 4-31: Temperature calibration ................................................................................................................................................................................................. 75
Figure 4-32: Calibration History screen.............................................................................................................................................................................................. 76
Figure 4-33: Calibrate offset verify screen for PID sensor................................................................................................................................................................. 77
Figure 4-34: Calibrating PID ............................................................................................................................................................................................................... 78
Figure 5-1: Quick help list for running a study ................................................................................................................................................................................... 80
Figure 5-2: Sample summary data from QSP-II reporting................................................................................................................................................................. 81
Figure 5-3: Sample time history data (or logged data) chart ............................................................................................................................................................. 82
Figure 5-4: Composite measurement screen in run mode ................................................................................................................................................................. 83
Figure 5-5: Example of measurement softkey menus ....................................................................................................................................................................... 85
Figure 5-6: Particulate Measurement screen..................................................................................................................................................................................... 86
Figure 5-7: Selecting a measurement calculation.............................................................................................................................................................................. 88
Figure 5-8: RH and temperature measurement screen ..................................................................................................................................................................... 89
Figure 5-9: Gas measurement screen ............................................................................................................................................................................................... 90
Figure 5-10: Composite measurement screen.................................................................................................................................................................................... 91
Figure 5-11: Attaching AirProbe and measuring Air velocity .............................................................................................................................................................. 92
Figure 5-12: Details of the composite measurement screen ............................................................................................................................................................. 93
Figure 5-13: Selecting Trend softkey .................................................................................................................................................................................................. 94
Figure 5-14: Trend Screen for PM (Dust)........................................................................................................................................................................................... 94
Figure 5-15: Past session screen........................................................................................................................................................................................................ 95
Figure 5-16: Past Session with Files selected .................................................................................................................................................................................... 96
Figure 5-17: Summary screen of a past session ................................................................................................................................................................................ 97
Figure 5-18: Delete session message................................................................................................................................................................................................. 98
Figure 5-19: Delete all sessions message ......................................................................................................................................................................................... 98
Figure 5-20: File Systems properties screen ..................................................................................................................................................................................... 99
Figure 5-21: Viewing estimated run time........................................................................................................................................................................................... 100
Figure 6: Communicating with the EVM and DMS .......................................................................................................................................................................... 101
Figure 6-1: DMS Start page and Setup/Download options ............................................................................................................................................................ 101
Figure 6-2: EVM and downloading ................................................................................................................................................................................................... 102
Figure 6-3: Data finder page............................................................................................................................................................................................................. 102
Figure 6-4: Charts and Graphs (panels) ........................................................................................................................................................................................... 103
Figure 6-5: EVM data in a report format........................................................................................................................................................................................... 104
Figure 6-6: Customizing DMS reports.............................................................................................................................................................................................. 105
Figure 6-7: Saving and sending EVM setups................................................................................................................................................................................... 106
Figure 6-8: General EVM setups ...................................................................................................................................................................................................... 107
Figure 6-9: Logging EVM setups...................................................................................................................................................................................................... 108
Figure 6-10: EVM Timed-Run Auto-Run setting .............................................................................................................................................................................. 109
Figure 6-11: EVM Auto-Run with Date setting................................................................................................................................................................................. 110
Figure 6-12: EVM Auto-Run with Day of Week setting.................................................................................................................................................................... 110
Figure 6-13: EVM Auto-Run with Day of Week setting.................................................................................................................................................................... 111
Figure 6-14: EVM Triggering setup .................................................................................................................................................................................................. 112
Figure 6-15: EVM Auto-Run with Day of Week................................................................................................................................................................................ 113
Figure 7-1: Removing and inserting PID sensor.............................................................................................................................................................................. 116
Figure 7-2: Removing intelligent-sensor casing with PID ................................................................................................................................................................ 118
Figure 7-3: Removing the lamp with removal tool ........................................................................................................................................................................... 118

List of Tables
x
Figure 7-4: Remove/insert PID sensor with lamp & pellet ................................................................................................................................................................ 119
Figure 7-5: PID sensor cleaning kit .................................................................................................................................................................................................. 119
Figure 7-6: Fitting/Inserting the lamp and pellet................................................................................................................................................................................ 120
Figure 7-7: Optical engine and cleaning .......................................................................................................................................................................................... 121
Figure 7-8: Cleaning the optical engine ............................................................................................................................................................................................ 122
Figure 7-9: When to clean impactors ............................................................................................................................................................................................... 124
Figure 7-10: Gravimetric cassette and filter paper maintenance .................................................................................................................................................... 125
List of Tables
Table 2-1: Keypad/user interface explained 13
Table 2-2: Indicators (i.e., run, stop, battery, Altf ) 15
Table 3-1: Display settings explained 24
Table 3-2: Logged intervals and selecting logged measurements 26
Table 3-3: Digital out/Logic settings 35
Table 4-1: Cross-sensitivity table of interfering gas 60
Table 4-2: Gas calibration softkeys explained 65
Table 5-1: Unit abbreviations 84
Table 5-2: Measurement softkeys explained 85
Table 5-2: Measurement softkeys explained (continued) 86
Table 5-3: Measurement values explained 89
Table 5-4: Past session files softkeys explained 96

Introduction
Particulate path
1
Chapter 1: Introduction
The EPA (Environmental Protection Agency)
conducted a study over the last 25 years (1975-
2000) and determined that 107 measurable air
pollutants, specifically carcinogens, exist in
working environments. Combined with the
advent of closed windows, modern office
buildings and various cleaning solvents, the
outcome has been energy efficient buildings and
homes which contain levels of carcinogens. At
high levels, this is known as “Sick Building
syndrome” and can cause acute effects such as
headaches, eye/nose/throat irritation, dry cough
or itchy skin, fatigue, and trouble concentrating just to name a few. Area
monitoring or spot checking for high levels of pollutants, such as particulates ,
VOC’s, and toxics, should be a common practice to ensure good indoor air
quality exists in your environment. If poor air quality is determined,
engineering controls such as proper air ventilation and the removal of toxic
gases, would be put into place in order to provide an adequate working/living
environment.
The EVM is equipped to measure several different airborne containments or air
pollutant applications including:
 Particulate matter sampling (dust monitoring)
 Gas sampling
 Temperature sampling
 Relative Humidity and Dew Point sampling
To get you started quickly with the EVM, the first chapter is dedicated to
introducing basic particulate matter and toxic gas information. The
subsequent chapters will guide you through setting up the EVM, running
studies, and assessing your results with easy to follow steps and illustrations.
CAUTION: The EVM is intended to measure gases that are potentially
dangerous to human health. To help ensure worker safety through the proper
use of your unit, it is important that you not only read but also understand the
contents of this manual. Please familiarize yourself with the unit before using it in
a potentially hazardous situation.
CHAPTER
1

Introduction
Particulate path
2
Particulate sampling (Aerosols/dust vapors)
The EVM is a portable-area monitoring instrument with a laser-photometer that
measures and stores concentration levels of airborne-dust over time. It is
designed to measure and help you identify the air pollutants, existing as matter
(gases and aerosols) in the environment. The methodology used entails a handful
of components including: an air inlet, the impactor (which is the particle size
selector), the collection of particulates, gravimetric sampling, and the pump which
are addressed in the upcoming sections.
Particulate path
Figure 1-1: Particulate path diagram
(1) TURRET
Air travels though the impactor and
the larger, heavier particulates will
stick to the greased plates within the
impactor.
(2) OPTICAL ENGINE
While the pump maintains the flow
rate, the smaller lighter particulates
will pass through the optical engine.
(4) PUMP
The remaining clean/filtered air
passes through the pump.
(3) GRAVIMETRIC CASSETTE
The particulates will collect/trap in the
gravimetric filter/cassettes.
(5) FLOW SENSOR
The clean/filtered air passes through
flow sensor (flow-control orifice hole).
(6) OUTLET
Lastly, it passes through to the Outlet
on the back of the instrument.
2
3
1
4
5
6
Flow
sensor
Temperature
sensor

Particulate sampling (Aerosols/dust vapors)
Particulate sizes
3
Particulate sizes
Aerosols and gases are experienced in industrial processes, workplaces, and in
every day life. Keeping in mind that inhalable dust is 100 microns and smaller, this
dust is usually filtered through the hairs and membranes in your sinuses. 10 microns
and smaller is considered “thoracic”, 4-10 microns is “inhalable” reaching into your
windpipe and other regions, and 4 microns and smaller is “respirable”. These
particulate sizes will represent what you will be measuring.
The figure below identifies different types and sizes of particulates and how it
affects the human body.
Gases and Aerosols Defined
----- Liquid : Mist--------------►
----- Solid: Fume---►
◄--------Spray----------------
◄-------Particulates----------
Aerosols
and
Particles
Medical
implications
◄--- Oil smokes ---►
◄-------------
◄---------------
Cement dust-----------►
---Fly ash----------------------
---- Tobacco smoke --►
◄--------------
--- Coal dust---------------►
◄---Pollens-------------►
◄--Atmosphere/Airborne--►
inhalable particulates
◄--Wood.►
Dust
◄--Textiles--►
Dust
---------Respirable pm---------►
(inhaled & penetrates the lungs)
---Thoracic pm------------------------►
(inhaled & penetrates the larynx/throat)
----------------------------Inhalable pm------------------►
(inhaled via the nose and /or mouth)
.01 0.1 1 10 100 1000
Particle matter (pm) diameter μm
Figure 1-2: Particulates and diameter size

Particulate sampling (Aerosols/dust vapors)
Particulates and cut-point
4
Particulates and cut-point
In consideration of how the size of particulates affect the human body, it is
important to select a particulate size cut-point. Essentially, the particle size
selector on the EVM is a top-mounted rotary impactor. Based on your
setting, it will filter out all particulates at or above the selected size. The
instrument has four settings which include 2.5 μm, 4 μm, 10 μm, or none
(100 μm). (This is explained in more detail in Chapter 4.)
Collecting/sensing the particulates
Once the impactor setting is selected, the EVM collects (or measures) real-
time aerosol/dust concentration using a 90º optical light scattering
photometer to determine the total mass concentration (in units of mg / m3)
of particulate matter. Additionally, gravimetric sampling, a more accurate
method, is also used to determine the mass of particulates.
Gravimetric sampling
Gravimetric sampling is a type of filtering
process in which the particulates are collected
and filtered into the gravimetric cassette after
the dust passes through the optical engine of
the EVM. A user supplied sealed gravimetric
cassette can be used in place of the cassette
provided by Quest. The sealed cassette can
be sent to a laboratory for analysis. This
testing is typically used to measure personal exposure to inhalable dust
concentrations.
Pump
The pump is used in the particulate sampling process as a source of air
movement so the particulates are aspirated (or suctioned out) and collected
for measurement. The flow rate is 1.67 Liter per minute. The pump is
typically calibrated before each gravimetric sampling.

Gas sensors sampling
Gas sensors and path
5
Gas sensors sampling
The EVM uses a unique smart sensor technology includes automatic
sensor recognition and measures up to three gases simultaneously: a
selection of optional nine toxic gases, Carbon Dioxide, combustible
gases, and VOC’s.
Gas sensors and path
Quest’s unique smart sensor technology includes automatic sensor
recognition, calibration levels, temperature compensation information
and other valuable data that travels with the sensor from one unit to
another.
The following diagram illustrates the gas sensor path for Toxic, CO2,
and PID sensors. It also identifies the temperature sensor for
additional analysis/measurements.
Figure 1-3: Gas sensor path illustration
1
Air inlet cover
2
3
Fan
Very quiet!
Gas sensor(s) path
(1) AIR INLET COVER
The path begins with the air pulling
through the air inlet cover.
(2) GAS SENSOR CHAMBERS
The air continues through the gas
sensor bar passing the Toxic, PID,
and CO2 sensor chambers.
(3) Fan
It is continuously ventilated by the
fan. (NOTE: when the pump is off,
the fan can be heard near the louvers
on the back cover.)
(4) Temperature sensor
Measures the ambient air temperature.
Temperature sensor

Volatile organic compounds (VOC’s) sampling
Gas sensors and path
6
Volatile organic compounds (VOC’s) sampling
According to the American Lung Association, Volatile Organic
Compounds (also referred to as VOC’s) are one of the top Indoor Air
Quality (IAQ) pollutants. These include:
 Biological agents (mold, dust, mites..etc..)
 Formaldehyde
 Second-hand tobacco smoke
 Volatile organic compounds (measured with a PID detector)
Serious, long-term exposure could lead to health affects including
leukemia, cancer, eye and respiratory irritations and short term
effects such as dizziness, memory loss, and visual impairments.
With the EVM you have the following parameters:
 Range 0 to 2,000 ppm Isobutylene.
 Calibrated with Sensitivity 1.0, using Isobutylene. Response
varies with each VOC.
 Units selection: ppm, ppb, mg/m3(for ppm PID sensor) or
μg/m3 (for ppb PID sensor).
Temperature, Relative humidity, Dew Point
It is important to monitor temperature, control moisture, relative
humidity, and monitor dew point levels in occupied spaces such as
office buildings, schools, and hospitals, to name a few. With the
presence of too much moisture mixed with dirt/dust particles, this can
contaminate the environment and enable mold to thrive. High levels of
relative humidity (RH) is a contributor of spreading and growing
biological pollutants such as molds, mildew, viruses, mites, building
dust, and pollen. Failure to control water leakage from humidifiers,
refrigerators, and ventilation equipment can also lead to high levels of
RH and high Dew Point. For appropriate air quality control, RH levels
should be maintained between 30 to 50 percent in a home/office
environment. Some of the common side effects include nausea,
headaches, running nose, coughing, and difficulty breathing to name a
few.
What the standards say
Many organizations have studied and analyzed the effects of toxic gas
and particulate exposures. As a result, standards were developed to
regulate exposure. In the United States, the Occupational Safety and

EVM Series
Resources
7
Health Administration (OSHA), the Mine and Safety and Health
Administration (MSHA), and the American Conference of Governmental
Industrial Hygienists (ACGIH), NFPA (National Fire and Protection
Agency), National Institute and Technology (NIST), and American
Society of Heating, Refrigeration, and Air-Conditioning (ASHRAE) have
all created regulations and limitations on total permissible exposure
levels.
International standards are specified by the health and safety
regulations such as the European Union (EU) and the European
Committee of Air Handling and Refrigeration Equipment Manufacturers
(EUROVENT-CEDOMAF). For Canadian standards, the Canadian
Standards Association (CSA) specifies air quality guidelines/regulations.
Resources
To access some of these copyrighted standards, please refer to the following:
 OSHA
http://www.osha.gov
 NFPA-654
http:///www.nfpa.org
 MSHA
http://www.msha.gov
 NIOSH
http://www.cdc.gov/niosh
 ACGIH
http://www.cdc.gov/niosh
 ASHRAE
http://www.ashrae.org
 NIST
http://www.nist.gov
 IEC
http://www.iec.ch
 CSA
http://www.csa.ca
EVM Series
Applications
A real-time, direct reading dust monitor is used in many different
applications such as walk-through surveys in manufacturing, wood
making plants and/or bakery shops, background sampling, site dust
measurements, assessment of the effectiveness of dust control
systems, and measurement of indoor air quality (IAQ). It is also used

EVM Series
Applications
8
to analyze work-place exposure and help identify dust control
techniques such as training or implementing engineering controls.
 Industrial setting - Used to monitor and ensure health
and safety in settings where toxic fumes are released (such
as testing levels at a paper mill or a foundry). This
information can be used to identify the source and particle
concentrations.
 Sick Building syndrome –Used to evaluate air toxins and
ensure building standards maintain a comfortable work
setting.
 Work site assessments
 Military applications
 Outdoor monitoring applications include construction
sites/dust outside of mines
 Regulatory compliance (i.e., OSHA, MSHA, IEC, ACGIH)
 As a mapping device- Layout a grid of high contaminant
areas, and quickly collect sample data at multiple locations to
help identify paths and sources, by relative readings.
 As a survey monitor
 Specific area in a plant/facility –used to maintain a
quality work environment and conduct area monitoring
samples throughout an entire facility.
 Specific areas in a plant/facility- used to identify
key areas that may be toxic or unsafe and implement
acceptable practices such as changes in the ventilation.
Time history: manufacturing
Particulate Measurement:
.250 mg/m3

EVM Series
Models explained
9
Models explained
The EVM Series simultaneously measures and data logs specific
sensors/parameters that were ordered with your instrument. The models,
sensors, and accessories are explained in detail below. Please refer to the
part’s listing for further details (such as calibration accessories).
Models and sensors
Optional sensor
accessories
EVM-7 includes:
 Particulates
 Carbon monoxide (CO) or (1) selectable toxic gas
 Selectable toxic gas sensors include:
1. Carbon Monoxide (CO) 2. Chlorine (CL2)
3. Ethylene Oxide (ETO) 4. Hydrogen Cyanide (HCN)
5. Hydrogen Sulfide (H2S) 6. Nitric Oxide (NO)
7. Nitrogen Dioxide (NO2) 8. Oxygen (O2)
9. Sulphur Dioxide (SO2)
 Volatile Organic Compounds with PID ppm or PID ppb sensor
 ppm – parts per million (0 – 2,000 ppm)
 ppb – parts per billion (0 – 50,0000 ppb)
 Relative Humidity
 Temperature
 Carbon Dioxide (CO2)
 AirProbe-10
EVM-4 includes:
 Carbon monoxide (CO) or selectable toxic gas
 Relative Humidity
 Temperature
 Carbon Dioxide (CO2)
 AirProbe-10
 Toxic
sensor/CO
sensor
 CO2 sensor
 PID sensor
 Particulates
EVM-3 includes:
 Particulates
 Relative Humidity
 Temperature
 AirProbe-10
 Toxic
sensor/CO
sensor
 CO2 sensor
 PID sensor

EVM Series
Models explained
10
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