mPower Electronics POLI MP400 User manual

POLI
Multi-Gas Detectors
MP400 & MP400P
User’s Guide
Rev 1.11
July, 2019

POLI User’s Guide
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Contents
1. General Information..............................................................................................................5
1.1 Main Features............................................................................................................................................................ 5
2. Battery................................................................................................................................6
2.1 Battery Charging........................................................................................................................................................ 6
2.2 Battery Status ............................................................................................................................................................ 6
2.3 Battery Replacement................................................................................................................................................. 6
3. User Interface.......................................................................................................................7
3.1 Displays and Keys....................................................................................................................................................... 7
4. Basic Operation ....................................................................................................................9
4.1 Turning On.................................................................................................................................................................. 9
4.2 Turning Off .................................................................................................................................................................9
4.3 Active Sensor Displays.............................................................................................................................................10
4.4 Pump Status.............................................................................................................................................................10
4.5 Alarm Testing...........................................................................................................................................................11
4.6 Main User Menu......................................................................................................................................................11
5. Configuration Mode ............................................................................................................12
5.1 Entering Configuration Mode .................................................................................................................................12
5.2 Exiting Configuration Mode....................................................................................................................................12
5.3 Navigating Configuration Mode to Edit Parameters.............................................................................................13
5.4 Calibration and Bump Testing ................................................................................................................................16
5.5 Measurement...........................................................................................................................................................20
5.6 Alarm Settings..........................................................................................................................................................21
5.7 Datalog.....................................................................................................................................................................23
5.8 Monitor Set-up.........................................................................................................................................................23
5.9 Wireless Set-up ........................................................................................................................................................25
6. Data Communication...........................................................................................................26
6.1 Connecting and Configuring....................................................................................................................................26
6.2 Datalog Retrieval.....................................................................................................................................................27
6.3 Real-Time Data ........................................................................................................................................................28
7. Maintenance......................................................................................................................29
7.1 Year of Manufacture ...............................................................................................................................................29
7.2 Replacing Filters.......................................................................................................................................................29
7.3 Removing/Cleaning/Replacing Sensor Modules....................................................................................................29
7.4 Replacing Pump or Battery .....................................................................................................................................30
8. Troubleshooting..................................................................................................................31
9. Technical Specifications .......................................................................................................32
Recommended Gas Span Concentrations ....................................................................................................................33
Technical Support and mPower Contacts....................................................................................34

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Read Before Operating
This manual must be carefully read by all individuals who have or willhave the responsibility of
using, maintaining or servicing this product. The product willperform as designed only if it is
used, maintained and serviced in accordance with the manufacturer’s instructions. The user
should understand how to set the correct parameters and interpret the obtained results.
CAUTION！
•REMOVE MONITOR COVER ONLY IN AREA KNOWN TO BE NON-HAZARDOUS.
•RECHARGE BATTERY ONLY IN AN AREA KNOWN TO BE NON- HAZARDOUS.
•USE ONLY mPOWER’S RECHARGEABLE LITHIUM BATTERY P/N M004-3002-000.
•USE OF NON-mPower COMPONENTS WILL VOID THE WARRANTY AND CAN
COMPROMISE THE SAFE PERFORMANCE OF THIS PRODUCT
•SUBSTITUTION OF COMPONENTS MAY IMPACT INTRINSIC SAFETY.
CAUTION: HIGH OFF-SCALE READINGS MAY INDICATE AN EXPLOSIVE
CONCENTRATION. ANY RAPID UP-SCALE READING FOLLOWED BY A DECLINING
OR ERRATIC READING MAY INDICATE A GAS CONCENTRATION BEYOND UPPER
SCALE LIMIT WHICH MAY BE HAZARDOUS.
ATTENTION: DES LECTURES SUPÉRIEURES A L’ÉCHELLE PEUVENT INDIQUER
DES CONCENTRATIONS EXPLOSIVES. TOUTE LECTURE RAPIDE ET POSITIVE,
SUIVIE D’UNE BAISSE SUBITE AU ERRATIQUE DE LA VALEUR, PEUT INDIQUER
UNE CONCENTRATION DE GAZ HORS GAMME DE DÉTECTION QUI PEUT ÊTRE
DANGEREUSE.
WARNINGS
ONLY THE COMBUSTIBLE GAS DETECTION PORTION OF THIS INSTRUMENT HAS
BEEN ASSESSED FOR PERFORMANCE.
UNIQUMENT, LA PORTION POUR DÉTECTOR LES GAZ COMBUSTIBLES DE CET
INSTRUMENT A ÉTÉ ÉVALUÉE.
CAUTION: BEFORE EACH DAY’S USE, THE SENSITIVITY OF THE COMBUSTIBLE
GAS SENSOR MUST BE TESTED ON A KNOWN CONCENTRATION OF METHANE
GAS EQUIVALENT TO 20 TO 50% OF FULLSCALE CONCENTRATION. ACCURACY
MUST BE WITHIN 0 AND +20% OF ACTUAL. ACCURACY MAY BE CORRECTED
BY A CALIBRATION PROCEDURE.
ATTENTION: AVANT CHAQUE UTILISATION JOURNALIERE VERIFIER LA
SENSIBILITE AVEC UNE CONCENTRATION CONNUE DE METHANE EQUIVALENTE
A 20-50% DE LA PLEINE ECHELLE. LA PRECISION DOIT ETRE COMPRISE ENTRE
0-20% DE LA VALEUR VRAIE ET PEUT ETRE CORRIGEE PARUNE PROCEDURE
D’ETALONNAGE.

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Special Conditions for Safe Use
•The POLI multi-gas detector must be calibrated if it does not pass a bump test, when a
new sensor has been installed, or at leastonce every 180 days, depending on use and
sensor exposure to poisons and contaminants
•No precautions against electrostatic discharge are necessary for portable equipment that
has an enclosure made of plastic, metal or a combination of the two, except where a
significant static-generating mechanism has been identified. Activities such as placing the
item on a belt, operating a keypad or cleaning witha damp cloth, do not present a
significant electrostatic risk. However, where a static-generating mechanism is identified,
such as repeated brushing against clothing, then suitable precautions shall be taken, e.g.,
the use of anti-static footwear.
Note: Users are recommended to refer to ISA -RP12.13, Part II-1987 for general information on
installation, operation, and maintenance of combustible gas detection instruments.
Proper Product Disposal at the End of Life
The Waste Electrical and Electronic Equipment (WEEE) directive
(2002/96/EC) is intended to promote recycling of electrical and
electronic equipment and their components at end of life. This symbol
(crossed-out wheeled bin) indicates separate collection of waste
electrical and electronic equipment in the EU countries. This product
may contain one or more Nickel-metal hydride (NiMH), Lithium-ion, or
Alkaline batteries. Specific battery information is given in this user
guide. Batteries must be recycled or disposed of properly. At the end of
its life, this product must undergo separate collection and recycling from
general or household waste. Please use the return and collection system
availablein your country for the disposal of this product.

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1. General Information
The POLI multi-gas detectors (MP400 & MP400P) offer 4- or 5-gas monitoring of oxygen (O2),
combustible (LEL) gases, toxic gases, carbon dioxide (CO2), and volatile organic compounds
(VOCs). The MP400 is a diffusion sampling model with standard O2, LEL, carbon monoxide
(CO) and hydrogen sulfide (H2S) configuration. A firefighter versionuses O2, LEL, CO and
hydrogen cyanide (HCN) sensors, and a 5-gas version including sulfur dioxide (SO2) is also
avaliable.The MP400P is a standard model with pump and allowsa full selection of sensors, e.g.
over 15 different electrochemical (EC) sensors, pellistorfor LEL, non-dispersive infrared
(NDIR) for hydrocarbons in both LEL and Vol% range and photo-ionization detector (PID) for
VOCs. The MP400S (check availability) is an advanced model with pump and a built-in wireless
module that sends critical data including man-down, gas concentration, and battery alarms to
supervisors and control centers on site or at remote locations for faster responses and maximized
safety.
1.1 MainFeatures
•3 models of diffusion, pumped and wirelessoptimized for basic confined space entry (CSE)
compliance, professional, and advanced applications
•Large, graphical display and icon-driven user interface through intuitive, simple, two-button
operation. Auto flip-screen when held up-side down.
•Over 30 interchangeable sensor configurations, including PID for VOC, NDIR and catalytic
sensor for combustibles, and NDIR for CO2
•Intelligent sensors store calibrationdata ready for quick installation in the field
•Easy access to pump, sensors and filter
•Long battery run time of 16 hours in diffusion mode and 12 hours with pump running
•6 months continuous datalog storage with 4 sensors
•Man-down, gas concentration and battery alarm notification via ISM wirelessat no
operating cost
•IP-65/67 water and dust resistant rating
•Durable double-shot outer case

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2. Battery
Fully charge the POLI battery upon receiving the instrument and before each day’s use. The
Li-ion battery is charged using a Micro-USB cable.
NOTE: Any locally-obtained USB A to Micro B USB cable works for charging, but does not
work for communication with mPower Suite configuration and data transfer software. The
mPower USB cable P/N M-011-3003-000 is required for a PC to recognize the instrument and
communicate with mPower Suite.
WARNING
To reduce the risk of ignition of hazardous atmospheres, recharge, remove or replacethe battery
only in an area known to be non-hazardous!
2.1 Battery Charging
Plug the mini end of the Micro-USB cable into the charging port of POLI, and
the other end to a USB power adaptor or the USB port of a computer. The
screen will display a battery icon from empty to full and one alarmLED will
remain yellow. When the battery is fully charged, the icon displays full grid
status (see Section 3.1), and the alarmLED turns green.
2.2 Battery Status
The battery icon on the display shows how much charge is in the battery, and
alerts of any charging problem.
blink
Full charge
2/3 charge
1/3 charge
Battery Low
Battery Alarm
When the battery’s charge falls below a presetvoltage, the instrument warns by beeping once
and flashing once every minute. The instrument automatically powers down within 10 minutes,
after which the battery must be recharged. When a low-battery alarmoccurs, we recommended
promptly switching instruments to a fully charged POLI, and/or charging the battery in a non-
hazardous location.
2.3 Battery Replacement
The POLI Lithium-ion battery pack is free of maintenance. In case of a battery failure or end of
operating life, please contact the mPower Service Department or an authorized service center for
a battery replacement.

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3. User Interface
The POLI user interface consists of two keys, four sensor sockets, one large Liquid Crystal
Display (LCD), eight alarm LEDs, one buzzer, and two vibration alarms.
3.1 Displaysand Keys
The LCD provides visual information that includes real-time gas readings, sensor types, datalog /
battery / pump / wirelessstatus, and others.
Special notice
Man Down alarmenabled
Datalog on reminder
Battery status
Unit of measure
Functions of left and right keys
Concentration
reading
Sensor type
Wireless status
Pump status
Valid on Cal & Bump
test
(pump models)
(Gas inlet/outlet
diffusionmodels)

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3.1.1 Status Indicator Icons
Along the top of most screens are status icons that indicate whether a function is operating and/or
its strength or level.
Icon
Function
Wireless signal strength at 0-5 level
Pump status (pump versions only)
Datalogging enabled (cannot turn off)
Battery voltage status
Man-down alarmenabled
All sensors have been bump tested and calibrated;no sensor is overdue for a bump
test or calibration according to the intervals configured on the instrument.
3.1.2 Keys and Interface
The POLI has two keys:
Left [+/OK] Key Right [ /↓] Key
Confirm Operation/Increase Number Power On-Off/Move Cursor
These two keys are marked as [+/OK] to Confirm Operations or Increase Number and [ /↓] to
Power On-Off / Move Cursor. They also act as ‘soft keys’ mapped to two text or symbol boxes
at the LCD bottom that change numbers and make selections under various menus.
In addition to the functions describedabove, the Left [+/OK] key can be used to manually
activate the LCD backligh when it is off, and to manually test the LED, audio and vibration
alarms from the main display.
3.1.3 Alarm Overview
The POLI providesan unmistakable five-way alarm notification that combines local alarms on
the device with real-time remote wireless alarm notification to enhance worker safety up to the
next level. Device alarms include audible buzzer, visiblebright LED lights, vibration, and alarm
notification on the display. These can be programmed or selectively turned on or off.
During each measurement period, the gas concentration is compared with the programmed alarm
limits for Low, High, TWA and STEL alarms. If the concentration exceeds (or goes below,in the
case of oxygen) any of the preset limits, the alarms are activated immediately to warnboth the
POLI user and a remote safety officer (if wirelessis enabled) of the alarmcondition.
A major new feature is the Man-Down detection, which can be enabled to activate local and
remote alarms when the user has collapsed or stopped moving. In addition, the POLI alarms
when the battery voltage is low, pump is blocked, and in other fault conditions.

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4. Basic Operation
4.1 TurningOn
Press and hold the [ /↓] Key for 3 seconds, until the buzzer beeps and the red LED turns on. As
the unit is powers on, it willdisplay information such as:
•mPower logo and Company name
•Product type, Model No. and Serial No.
•Firmware version, Build date and time
•Battery type and Voltage
•Datalog interval
•Alarm Limits for each Sensor type
The POLI’s main reading screen then appears. It usually takes 1 to 2 minutes for sensors to show
meaningful readings. For some sensors not fully warmed up by the time, the main screen shows
‘- -’instead of numerical values until the sensor is stabilized, typically in a few more minutes. It
then displays instantaneous readings similar to the screens shown in Section 2.2 (depending on
the sensors installed) and is ready for use.
Note: If the battery has insufficient power, the LCD briefly shows the message ‘Battery Fully
Discharged’ and the POLI shuts off automatically. The battery should then be recharged or
replaced with a fully charged battery before turning on again.
IMPORTANT!
If a major error that prevents the POLI from functioning occurs during startup, the message
‘Contact Service’ is displayed. The instrument should be shut off and sent for service.
4.2 TurningOff
In normal reading mode, press and hold the [ /↓] key. The unit will show a 5-second count
down, with red LED flashes and buzzer beeps once per second. After the last long flash and
beep, the unit displays ‘Power Off’, and turns off.
Caution: The alarmis loud. During startup, one can mute most of the sound by temporarily
holding a finger over the buzzer opening hole. Do not put tape over the buzzer opening as it
permanently mutes and causes a serious safety concern.

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4.3 ActiveSensor Displays
The POLI is a flexible platform with four sensor sockets that allows use of anywhere between
one and five sensors, the latter with a dual toxic sensor. When one or more sensors is either not
installed or turned off, the display only shows the installed, active sensors:
4.4 Pump Status
During normal operation, the pump icon alternately shows inflow and outflow. If
there is a pump failure or obstruction, the alarm sounds and the pump stall icon
blinks on and off. If this occurs, clear the obstruction and press the Left [+/OK]
key to restart the pump.
IMPORTANT!
Obstructions can cause premature wear on the pump and false readings. If the pump does not
restart after pressing [+/OK], consult the Troubleshooting section of this guide or contact an
mPower servicecenter for technical support.
Note: Pump status is not indicated on diffusion versions of the POLI.

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4.5 Alarm Testing
Under normal operation mode and non-alarm conditions, the audible (buzzer) alarm, vibration
alarm, LED, and backlight can be tested at any time by pressing [+/OK] once.
WARNING!
If any of the alarms do not respond to this test, check the Alarm Settings in Configuration Mode
to see if the alarms have been turned off. If any of the alarms is enabled but not functional, do
not use the instrument. Contact an mPower servicecenter for technical support.
4.6 Main UserMenu
The user menu in the reading mode is simple to go through using the [ /↓] and [+/OK] keys.
The information sequence is shown below. The Peak, Minimum, STEL and TWA for each
sensor since turn-on are displayed, with the option to clear and re-start Peak or Minimum. In
addition, If the POLI is fitted with a PID or Pellistor LEL sensor, the corresponding Calibration
Gas and Measurement Gas (and its Correction Factor) are displayed (after Battery information).
REAL-TIME READINGS
[ /↓]
PEAK -----Clear Peak? [+/OK]
[ /↓]
MINIMUM -----Clear Min? [+/OK]
[ /↓]
STEL
[ /↓]
TWA
[ /↓]
DATE, TIME, TEMPERATURE
[ /↓]
BATTERY TYPE, VOLTAGE, RUN TIME, LAST RUN
[ /↓]
PID CAL GAS, MEASUREMENT GAS, CORRECTION FACTOR (If installed)
[ /↓]
LEL CAL GAS, MEASUREMENT GAS, CORRECTION FACTOR (If installed)
[ /↓]
START COMM?
[ /↓]
REAL-TIME READINGS
The last display before returning to Real time readings is “Start Comm?”. Pressing the check box
stops the pump and readings, and waits for communication with a PC using mPower Suite to
transfer data or update the instrument configuration (see Section 6).

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5. Configuration Mode
The Configuration Mode (Config Mode) is used to adjust the POLI’s operation settings and
calibrate sensors. Remember that the two text/symbol boxes at the bottom of the display are
mapped to the Left [+/OK] and Right [ /↓] keys and willvary with the menu.
5.1 EnteringConfigurationMode
Press and hold both the [+/OK] and [ /↓] keys simultaneously for 3 seconds until the password
screen appears. The default passwordis ‘0000’ and can only be changed using mPower Suite
software. The passwordis needed only the first time Config Mode is entered after power is
turned on.
•Increase the number from 0 through 9 by pressing [+/OK] (mapped to ).
•Step from digit to digit using [ /↓] (mapped to ).
•After entering all four digits, Press [ /↓] again and changes to ‘ ’.
•Press [+/OK] to register the password and enter Config Mode.
If the passwordis not correct, the message ‘Incorrect!’ is displayed and the unit returns to the
reading mode automatically. If a wrong digit is entered, use the [ /↓] key to move the cursor
among four digits and press [+/OK] to change the input.
5.2 Exiting ConfigurationMode
To exit, scroll through the main Confg Mode Menu using the [ /↓] key until the
door symbol is highlighted and press [+/OK]. Or simply wait, and the unit willreturn to
normal operating mode automatically if no buttons are pressed for one minute.

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5.3 NavigatingConfigurationMode to EditParameters
After entering Config Mode, the calibration menu is displayed first. Press [ /↓] (→) to step
through the menus and [+/OK] (Enter) to enter a menu to edit the parameters in its submenu.
5.3.1 Menusand Sub-menus
Configuration Mode menus and sub-menus are organized as shown here:
Calibration
Measurement
Alarm
Datalog
Monitor Setup
Wireless**
Exit
Fresh Air Calib
Enable/Disable
High Limit
Clear All
LCD Contrast
Register
Nitrogen Calib
Gas Unit
Low Limit
Interval
Pump Speed*
Host ID
Span Calib
Exit
STEL Limit
Sensor
Select
Pump Stall*
Channel
Bump Test
TWA Limit
Exit
TemperatureUnit
Exit
Span Value
Alarm Device
Language
Exit
Heart Beat
Light
Back Light Mode
M-D†On/Off
LCD Auto Flip
Man-Down
Warn Time
Clock Set-up
Man-Down
Threshhold
Exit
Man-Down
Tmotionless
Exit
*Operational in Pump versions only. **Operational inWireless versionsonly. †M-D= Man-Down

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5.3.2 Navigating Lists
There are two types of menus in Configuration Mode: 1) those that ask for selection from a list
and 2) those that ask for a numerical value to be entered. Simple lists and those with radio
buttons are used when only one option can be selected. Check [X] boxes are used when multiple
options can be selected at the same time.
5.3.2.1 Simple Lists
When a simple listis shown, use the [ /↓] down-arrow key to highlight the desireditem and
then press [+/OK] (Enter) to enter the sub-menu. To exit the simple list,scroll down until Exit is
highlighted and the Enter key changes to ‘ ’, then press [+/OK].
5.3.2.2 Check [X] Box Lists
When a Check [X] Box list appears as shown above, follow the numbered sequence in blue
above. If no change is desired, simply press [+/OK] ‘ ’ to exit. To make changes, 1press [ /↓]
and the first item is highlighted. 2Use [+/OK] to toggle the item checked or unchecked, and 3
use the arrow [ /↓] to move to the next item or end of the listwhere (Toggle) changes to ‘ ’.
Finally, 5 press [+/OK] ‘ ’ to exit and 6 press [+/OK] ‘ ’ again to save. If Save is not
acknowledged, no changes will be made and the unit will revertback to the previous settings.
Main Config Menu
Simple List
Main Config Menu
Simple List
Check-Box List
Change
Change
Toggle
CO
2
1
3
4
5
Change
Save?
Exit
Exit

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5.3.2.3 Radio Button Lists
Radio buttons are used when only a single item in the listcan be selected, and there are no
further sub-menus. When a radio button listappears, follow the numbered sequence in blue as
shown below. If no change is desired, simply press [+/OK] ‘ ’ to exit. To make changes, 1
press [ /↓] (Change) and the first item is highlighted. 2Use the down arrow [ /↓] to move to
the desired item, 3use [+/OK] (Select) to choose the highlighted item, and 4use the down arrow
[/↓] to move to the next item or end of the list where (Select) changes to ‘ ’. Finally, 5 press
[+/OK] ‘ ’ to exit.
5.3.3 Entering Numerical Values
To enter numerical values in a list, proceed as shown below. If no change is desired, simply press
[+/OK] (Done) to exit. To make changes, press [ /↓] (Change) and the first item is highlighted.
Use the arrow [ /↓] to move to the desired item(s), use [+/OK] (Inc/+) to increase the numerical
value. Then use the arrow [ /↓] to move to the next item or end of the list where (Inc/+) changes
to (Done). Finally, press [+/OK] (Done) to exit and press [+/OK] (Done) again to save. If Save is
not acknowledged, no changes willbe made and the unit willrevert back to the previous settings
5.3.3.1 Decreasing Numerical Values
To switch the Left soft key function from increasing to decreasing, hold both keys down
simultaneously for about 2 seconds until changes to . After exiting the menu, the
Left key willautomatically revert to increasing numbers again.
M-D On/Off
○ Off
◉ On
○ Vertical Off
○ Horizontal Off
M-D On/Off
○ Off
◉ On
○
Vertical Off
○ Horizontal Off
Select
M-D On/Off
○ Off
◉ On
○ Vertical Off
○ Horizontal Off
Change
4
2
Change
1
3
5
Radio Button List
Low Limit
CO(ppm) H2S(ppm)
35 10.0
O2(%) LEL(%LEL)
19.5 10
Low Limit
CO(ppm) H2S(ppm)
35 10.0
O2(%) LEL(%LEL)
19.5 10
Done
Inc/+
Low Limit
CO(ppm) H2S(ppm)
50 10.0
O2(%) LEL(%LEL)
19.5 10
Low Limit
CO(ppm) H2S(ppm)
50 10.0
O2(%) LEL(%LEL)
19.5 10
Inc/+
Done
Change
Change

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5.4 Calibrationand Bump Testing
Use this menu to perform zero or span calibrationfor one or more sensors, bump test the sensors
and alarms for function, and change the span gas concentration.
The POLI should be calibratedon the first day of use and at regular intervals not to exceed 180
days, depending on use and exposure to particulates, contaminants and sensor poisons. A daily
bump test should be performed to ensure a functional response of all sensors and alarms.
•BUMP TEST is defined as a brief exposure to sensor gases, typically 30 seconds, just long
enough to indicate that the sensors are responsive and the alarms are functional, without
concern for a quantitative measurement.
•CALIBRATION is defined as exposing the sensor(s) to a known concentration standard gas
for the full calibration time (typically 60 to 90 seconds) and setting the reading of the
sensor(s) equal to the concentration of the calibration gas.
Calibration intervals and bump test procedures may vary due to sensor type, ambient conditions,
local regulations and/or the user’s company policies.* Automatic reminders for calibrationand
bump tests can be set up using the mPower Suite software (see Section 6.1). When a calibration
or bump is due, the sensor name alternates with a highlighted 'CAL' or ‘BUMP’ as shown below:
Calibration is also required if:
•The sensor module has been replacedwith one whose calibrationis overdue.
•The user has changed the calibration gas type without recalibrating the instrument.
•The sensor has failed ina previous calibration.
For more on calibrationfrequency seeTech/App Note 3 “How Often to Calibrate Gas Detectors”.*
*The calibrationfrequency must be defined by the user’s company policy because each application is different and
may cause a sensor’s sensitivity loss for various reasons out of mPower’s control, such as liquids,dirt or corrosion
preventing gas fromreachinga sensor,or exposure to chemicals that poison a sensor’s function. Exotic gas
sensors tendto needmore frequent calibrationthancommonO2,LEL, CO and H2S sensors. In general we
recommend a bump test before each day’s use to test sensor response and alarm function. A calibrationcheckcan
be performedbyapplying a known concentrationgas to see if the sensors still respondwithintypical limits. Cal
checkintervals can be increasedas the user gains experience inthe application. If a bump or cal checkfails, the
instrument shouldbe given a full calibration. We recommendno more than one month between full calibrations,
but this can be extendedfor up to 6 months if company policyallows.

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5.4.1 Calibration Set-Up
5.4.1.1 Span Gas Selection
The gas concentration chosen for span calibrationand bump testing should be near the middle to
upper range of the concentrations expected to be measured. If the possible gas concentrations
are unknown, choose a gas concentration near the upper end of the sensor’s range, or near the
highest exposure limit (e.g., TWA, STEL or Ceiling) of concern. Standard 4-gas mixtures allow
calibrationof 4 sensors at the same time. mPower has selected a mixture of 50 ppm CO/15 ppm
H2S/2.5% CH4/18% O2, (balance N2) as the recommended calibrationgas for such monitors.
Span gas recommendations for other gases are listed at the end of this manual and in TA Note 4.
Some sensors can be calibrated with surrogate gases when the gas they are designed to measure
is highly reactive, expensive or otherwise difficult to obtain.
Note that some common sensor combinations use calibration gases that are incompatible and
therefore must be applied separately, for example chlorine (Cl2) & ammonia (NH3) and chlorine
dioxide (ClO2) and hydrogen sulfide (H2S). For such cases it is important to allowa few minutes
between calibrations to allow one interfering gas to clear out before the other is applied.
5.4.1.2 Calibration Compounds for PID and LEL Sensors
Because PIDs and LEL sensors are broadband detectors, they can be calibrated with many
possible gases. The type of calibrationgas is selected from a listof several hundred compounds
in mPower Suite (Section 6.1), typically isobutylene for PID and methane for LEL. The
measurement gas is also selected in mPower Suite. Correction factors are calculated and
automatically applied to make the display read in equivalents of the Measurement Gas.
5.4.1.3 Gas Connections and Regulators
Calibration gas is most easilysupplied from a pressurized cylinder controlled by a regulator.
•Fixed-flow Regulators are pre-setto delivera consistent flow rate regardless of the gas
pressure remaining in the cylinder. We recommend 0.3 LPM regulators for diffusion POLI
versions and 0.5 LPM regulators for pumped POLI versions.
•Demand-flow Regulators are more expensive but save gas by allowing only the amount of
gas to flow that the POLI pump withdraws. These regulators cannot be used with diffusion
instruments since they have no pump.
•Gas Generators provide their own flow and are required for a few gases like ozone (O3)
and chlorine dioxide (ClO2) that are too unstable to be stored in a cylinder.
•Trigger Regulators supply a puff of gas at an undefined flow and are useful for quickly
doing a functional bump test without entering Config Mode to record the test.
Pumped Instruments. We recommend calibrating the POLI with the pump on the High Flow
setting, where it typically draws between 350 cc/min (0.35 LPM) and 450 cc/min (0.45 LPM)
with a 0.45 µm filter in place. In this case the instrument can be connected directly to the gas
cylinder fitted with either a demand-flow regulator or a 0.5 LPM fixed flow regulator. If the
fixed-flow regulator supplies more than 0.5 LPM, a T-connector, as illustrated below, must be
used in the gas supply line to allow excess gas to escape without being forced through the POLI
pump and sensor chambers. Even when using a T-connector, we recommend no more than 1.0
LPM total flow.
Note: Make sure the pressure in the gas cylinder is >100 psi when using a T-connector.

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Diffusion Instruments. Diffusion instruments have a black cap covering the Luer connector to
protect the unit from dirt and moisture. This cap must be removed to attach the Luer fitting and
connected tubing leading to the gas supply. (Internal channels distribute the gas to each sensor,
even though during measurements the gas enters and leaves through the four filters on the face of
the POLI.) The gas flow should be low, between 0.2 and 0.3 LPM to avoid pressure build-up in
the sensor channels. Do not use a
5.4.1.4 PTFE Connecting Tubing for Reactive Gases
For reactive gases including ozone, chlorine, chlorine dioxide, hydrochloric acid, hydrofluoric
acid, and absorbable gases such as most VOCs, it is criticalto use inert connecting tubing such
as PTFE (Teflon) and make connections as short as practical. More flexible variants such as
PTFE-lined Norprene or PTFE-lined Tygon are suitable alternatives. For most other gases,
including standard 4-gas mixes with carbon monoxide, hydrogen sulfide and methane, Tygon
tubing is adequate and convenient because of its flexibility.
5.4.1.5 Other Attachments
It is always most accurate to calibrate the POLI with all attachments in place in the same manner
as in the field measurements. For example, normally a filter should be used on the POLI inlet for
both measurements and calibration. However, if a filter is not used during measurement (as
preferred in a few cases of highly reactive gases) then no filter should be used during calibration.
Similarly, if extension tubing is being used during sampling, a more accurate calibrationis
obtained if the tubing is also attached during calibration. This method accounts for any small
changes made to the gas concentration by the attachment(s).
Demand-flow or 0.5 LPM
fixed flow regulator
Fixed-flow regulator with >0.5 to
1.0 LPM flow using T-connector
Connect
tubing using
Luer fitting
Remove cap
Pumped Instruments
DiffusionInstrument
Connect to gas with
fixed-flow regulator of
0.2-0.3 LPM flow
Luer fitting

POLI User’s Guide
19
5.4.2 Fresh Air (Zero) Calibration
Zero calibrationshould precede span calibration and be done in clean air with 20.9% oxygen.
This procedure determines the zero points of most sensors and the span calibration for the
oxygen sensor. No gas connections are required if the ambient air contains no detectable
contaminants.
In Configuration Mode, enter the Calibration menu and select ‘Fresh Air Calib’to show the
selected sensor list. De-select any sensor(s) not wanted to be zeroed ([ /↓] (Change)). Start the
zero calibration by pressing [+/OK] ‘ ’ to initiate the 30-second zero calibrationcount-down.
The zeroing process can be aborted at any time during this count-down by pressing [ /↓]. When
the zero calibrationis complete, the ‘Pass’ or ‘Fail’ result is shown for each sensor.
5.4.3 Nitrogen Calibration
Nitrogen calibration is used to set the baseline for the oxygen sensor only. This calibrationis
needed only for applications in rather low oxygen concentrations below about 5 Vol%, because
the oxygen baseline is usually quite stable. It is not normally needed for breathing air
applications near 20.9 Vol% oxygen.
To perform an oxygen zero calibration, enter the ‘Nitrogen Calib’ menu, apply nitrogen gas to
the POLI inlet, and proceed as described for Fresh Air Calibration above. The nitrogen count-
down time is 60 seconds. Other inert gases such as argon or helium could also be used.
5.4.4 Span Calibration
In Configuration Mode, enter the Calibration menu and select ‘Span Calib’. Depending on the
configuration of the POLI, multiple sensors may be calibrated simultaneously. Select the desired
sensors and press [+/OK] ‘ ’. Verify that the span gas concentrations match those of the gas
cylinder. If not, abort and go to the Span Value menu to adjust. If OK, turn on the gas flow,
Fresh Air Calib
CO
H2S
----
----
O2
LEL
---- ----
Abort
29
Change
s
Change
s
Span Calib
CO H2S
50 ppm 15 ppm
O2 LEL
18% 50 %LEL
Abort
Span Calib
CO H2S
---- ----
O2 LEL
---- ----
Abort
59
Start
Start

POLI User’s Guide
20
connect the gas to the POLI, and press Start to initiate the 60-second count-down. The When
complete, the display shows the sensor readings alternately with a ‘Pass’ or ‘Fail’ message. The
span calibrationcan be aborted at any time during the count-down by pressing [ /↓] (Abort).
NOTE: If the sensor calibration fails, try again. If calibrationfails again, turn off the power and
replace the sensor. WARNING! Do not replace sensors in hazardous locations!
Gases that are not availableas mixtures must calibrated individually by de-selecting all other
sensors. When calibrating sensors for cross-reactivegases such as chlorine and ammonia or
chlorine dioxide and hydrogen sulfide, be sure to allowa few minutes between calibrations for
the previous gas to clear and toxic gas sensor readings to return to zero.
5.4.5 Bump Test
Enter the Calibration menu and select‘Bump Calib’. Most commonly the same gas is used for
bump testing as for a full calibration. Perform the bump test in the same manner as for Span
Calibration, ensuring that the test gas concentration values match those of the gas supply
cylinder. The Bump Test lasts 30 seconds, or as long as it takes to pass, whichever is shorter. It
can be aborted at any time during the 30 seconds. When the bump test is complete, the ‘Pass’ or
‘Fail’ result is shown for each sensor. Be sure to calibrate any sensor that fails a bump test.
Important! Make sure all of the sensors have warmed up before performing the bump test. The
instrument will displaythree dashes (‘--’) next to the sensor name during warm up. Once a
sensor has warmed up it willshow a concentration reading and a bump test can proceed.
5.4.6 Set Span Value
To change the calibration gas concentrations, enter the Calibration menu and select‘Span
Value’. Update the values as need and press Done to exit and acknowledge any changes when
asked to ‘Save?’ To switch the Left soft key function from increasing to decreasing, hold both
keys down simultaneously for about 2 seconds until changes to .
5.5 Measurement
Use this menu to enable or disablesensors and to set gas concentration units. Note that the
Measurement Gas type for PID and LEL sensors can only be selected using mPower Suite.
5.5.1 Enable/Disable Sensor
Sensors can be disabledif they are not needed for a particular application, or if a sensor fails but
the other sensors still provide useful readings. In Config Mode, enter the Measurement menu and
select ‘Enable/Disable’.Press ‘Change’and select or de-selectsensors as needed. Then scroll
to and press on the ‘ ’ box. Acknowledge ‘Save’ for any changes made, or press X to discard.
Span Value
CO(ppm)m H2S(ppm)
50 15
O2(%) LEL(%LEL)
18.0 50
Change
Done