Met One Instruments BAM-1020 User manual

Met One Instruments, Inc.
1600 NW Washington Blvd.
Grants Pass, OR 97526
Telephone: [phone]
Facsimile: [phone]
www.metone.com
BAM 1020 Particulate Monitor Operation Manual - ©
Copyright 2020 Met One Instruments, Inc. All Rights Reserved
worldwide. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any
other language in any form without the express written permission of Met One Instruments, Inc.
BAM 1020
P
ARTICULATE
M
ONITOR
O
PERATION
M
ANUAL
BAM 1020-9805 R
EV
A

Page 2 BAM 1020-9805 Manual Rev A.docx
Table of Contents
1 INTRODUCTION 5
1.1 About This Manual ................................................................................................................. 5
1.2 Technical Service ................................................................................................................... 6
1.3 BAM: Beta Attenuation Monitor .............................................................................................. 6
1.4 Beta Radiation Safety Statement ........................................................................................... 7
1.5 BAM 1020 US-EPA Configurations ........................................................................................ 7
1.6 BAM 1020 Other Configurations ............................................................................................ 7
1.7 BAM 1020 Specifications ....................................................................................................... 8
2 SITE SELECTION AND INSTALLATION 9
2.1 Unpacking, Inspection, and Evaluation Testing ..................................................................... 9
2.2 Enclosure Selection and Temperature Control ...................................................................... 9
2.3 Site Selection and Inlet Positioning Criteria ......................................................................... 10
2.4 Mounting Options in a Walk-In Shelter ................................................................................. 10
2.5 BAM 1020 Installation Instructions ....................................................................................... 11
2.6 BAM 1020 Power and Electrical Service .............................................................................. 19
2.7 Configuring External Sensors .............................................................................................. 20
2.7.1 Configuring the BX-597A / BX-598 Sensor .......................................................................... 20
2.7.2 Changing Sensor Addresses ............................................................................................... 20
3 USER INTERFACE 22
3.1 Main Operating Screen ........................................................................................................ 23
3.2 Menu Hierarchy and Navigation ........................................................................................... 25
3.3 The OPERATE Menu ........................................................................................................... 27
3.3.1 Load Filter Tape ................................................................................................................... 27
3.3.2 Transfer Data ....................................................................................................................... 28
3.3.3 About ................................................................................................................................... 29
3.3.4 Conc Chart ........................................................................................................................... 29
3.4 The TEST Menu System – Overview ................................................................................... 30
3.4.1 Leak Test ............................................................................................................................. 30
3.4.2 Ambient Temperature .......................................................................................................... 31
3.4.3 Ambient Pressure ................................................................................................................ 31
3.4.4 Flow Calibration ................................................................................................................... 31
3.4.5 Self Test ............................................................................................................................... 32
3.4.6 Filter Sensors ....................................................................................................................... 32
3.4.7 Span Membrane .................................................................................................................. 33
3.4.8 Tape Sensors ....................................................................................................................... 34
3.4.9 Inlet Heater .......................................................................................................................... 35
3.4.10 Beta Counter ........................................................................................................................ 35
3.4.11 Membrane Sensors .............................................................................................................. 36
3.4.12 Nozzle Sensors .................................................................................................................... 36
3.4.13 Digital Link ........................................................................................................................... 37
3.4.14 Relay Outputs ...................................................................................................................... 37
3.4.15 Analog Calibration ................................................................................................................ 38

BAM 1020-9805 Manual Rev A.docx Page 3
3.4.16 Analog Output ...................................................................................................................... 38
3.5 Setup Menu Description ....................................................................................................... 39
3.5.1 Clock .................................................................................................................................... 40
3.5.2 Sample ................................................................................................................................. 40
3.5.3 Flow ..................................................................................................................................... 41
3.5.4 Calibration ............................................................................................................................ 41
3.5.5 Inlet Heater .......................................................................................................................... 42
3.5.6 Units ..................................................................................................................................... 43
3.5.7 Clear Memory ...................................................................................................................... 44
3.5.8 Password ............................................................................................................................. 44
3.5.9 Reports ................................................................................................................................ 45
3.5.10 Alarms .................................................................................................................................. 50
3.5.11 Station ID ............................................................................................................................. 51
3.5.12 Met Average ......................................................................................................................... 51
3.5.13 Analog Outputs .................................................................................................................... 52
3.5.14 Serial Ports .......................................................................................................................... 52
3.5.15 Modbus ................................................................................................................................ 53
3.5.16 Ethernet ............................................................................................................................... 53
3.5.17 Ethernet Config .................................................................................................................... 53
3.5.18 Sound Volume ..................................................................................................................... 54
3.5.19 Touch Calibration ................................................................................................................. 54
3.5.20 Set Language ....................................................................................................................... 54
3.6 Alarms Menu ........................................................................................................................ 55
4 INITIAL SETUP OF THE BAM 1020 56
4.1 Power Up ............................................................................................................................. 56
4.2 Warm-up Period ................................................................................................................... 56
4.3 The Main Operate Screen .................................................................................................... 56
4.4 Filter Tape Loading .............................................................................................................. 57
4.5 Self-Test............................................................................................................................... 58
4.6 Initial Setup Settings Considerations ................................................................................... 59
4.7 Initial Leak Check and Flow Check ...................................................................................... 59
4.8 Starting a Measurement Cycle ............................................................................................. 59
5 THE MEASUREMENT CYCLE 60
5.1 The One-Hour Cycle Timeline .............................................................................................. 60
5.2 Automatic Span Checks During The Cycle .......................................................................... 61
5.3 Filter Tape Use .................................................................................................................... 62
6 MAINTENANCE, DIAGNOSTICS and TROUBLESHOOTING 63
6.1 Met One Recommended Periodic Maintenance Table ......................................................... 63
6.2 Filter Sensor Tests ............................................................................................................... 64
6.2.1 Filter Temperature Sensor Tests ......................................................................................... 64
6.2.2 Filter Humidity Sensor Tests ................................................................................................ 65
6.2.3 Filter Pressure Sensor Tests................................................................................................ 65
6.3 Flow System and Flow Calibrations ..................................................................................... 66
6.3.1 Flow System Diagram .......................................................................................................... 66

Page 4 BAM 1020-9805 Manual Rev A.docx
6.3.2 Flow Control ......................................................................................................................... 66
6.3.3 Total Flow (Q
TOT
) and Flow Rate (LPM) Conversions .......................................................... 66
6.3.4 About Leak Checks, Nozzle Cleaning, and Flow Checks .................................................... 67
6.3.5 Leak Check Procedure ........................................................................................................ 67
6.3.6 Nozzle and Vane Cleaning Procedure ................................................................................. 72
6.3.7 Field Calibration of the Flow System .................................................................................... 74
6.4 BAM 1020 Error and Alarm Descriptions ............................................................................. 76
6.4.1 Alarm Relay ......................................................................................................................... 78
6.5 Comparison of BAM 1020 Data to Integrated Filter Sampler Data ....................................... 79
6.6 Power Up Problems and Electrical Safety Considerations ................................................... 80
6.7 Basic Problem and Cause/Solution Table ............................................................................ 81
6.8 Nozzle Component Service and O-ring Replacement .......................................................... 84
6.9 Performing the 72-Hour Zero Filter Background Test .......................................................... 85
7 DATA COLLECTION AND COMMUNICATIONS 87
7.1 Back Panel Connections ...................................................................................................... 87
7.2 External Data Logger Interface System ............................................................................... 88
7.2.1 Analog Concentration Output Signal .................................................................................... 88
7.2.2 Early Cycle Mode Option For Analog Data Collection .......................................................... 89
7.2.3 Interfacing a Digital Data logger with the BAM 1020 ............................................................ 90
7.3 Digital Communications and Data Retrieval ......................................................................... 91
7.3.1 Direct Serial Port Connections and Settings ........................................................................ 91
7.3.2 Using Met One Comet Communications Software ............................................................... 92
7.3.3 Downloading Data Using Simple Terminal Programs .......................................................... 93
7.3.4 Help Menu and Command Descriptions Using a Terminal Program .................................... 94
7.3.5 Modem Option ..................................................................................................................... 99
7.3.6 BAM 1020 Firmware Upgrade .............................................................................................. 99
8 ACCESSORIES and PARTS 100
8.1 Consumables, Replacement Parts, and Accessories ........................................................ 100
9 THEORY OF OPERATION 105
9.1 Converting Data Between EPA Standard and Actual Conditions ....................................... 106

BAM 1020-9805 Manual Rev A.docx Page 5
1 INTRODUCTION
1.1 About This Manual
This document is organized with the most important information toward the front of the manual, such
as site selection, installation, setups, and field calibrations.
Toward the back are sections that provide in-depth information on subjects such as theory,
diagnostics, accessories, and alternate settings. These sections provide valuable information which
should be consulted as needed. Electronic versions of this manual are also available.
This manual is periodically revised for maximum accuracy, and to incorporate new features or
updates. Below is a brief description of the BAM 1020 manual revision history:
Rev Released Manual Description
A 2020-06-09 Initial release of BAM 1020 (83440)
Table 1-1 BAM 1020 Manual Change Summary

Page 6 BAM 1020-9805 Manual Rev A.docx
1.2 Technical Service
Technical Service representatives are available during normal business hours of 7:00 a.m. to 4:00
p.m. Pacific Time, Monday through Friday. In addition, technical information and service bulletins are
available from our website. Please contact us at the phone number or email address below to obtain
a Return Authorization (RA) number before sending any equipment back to the factory.
Phone: [phone] Fax: [phone]
E-Mail: [email protected] Web: www.metone.com
Address: Technical Services Department
Met One Instruments, Inc.
1600 NW Washington Blvd.
Grants Pass, OR 97526
All BAM 1020 monitors have a serial number on the label on the back panel, embossed on the two
metal NRC tags, and printed on the calibration certificate. This number is needed if contacting the
technical service department to request information about repairs or updates for the BAM 1020. The
serial number begins with a letter which represents the year of manufacture, followed by a unique
four or five digit number. Example: Y21723 was built in 2019.
Letter Year Letter Year Letter Year
Y 2019 K 2029 A 2039
A 2020 M 2030 B 2040
B 2021 N 2031 C 2041
C 2022 P 2032 D 2042
D 2023 R 2033 E 2043
E 2024 T 2034 F 2044
F 2025 U 2035 G 2045
G 2026 W 2036 H 2046
H 2027 X 2037 J 2047
J 2028 Y 2038 K 2048
Table 1-2 Met One Instruments, Inc. Serial Number Designations by Year
1.3 BAM:
B
eta
A
ttenuation
M
onitor
The Met One Instruments BAM 1020 beta attenuation mass monitor automatically measures and
records ambient particulate mass concentration levels using the principle of beta ray attenuation. This
method provides a simple determination of the ambient concentration of particulate matter in mg/m
3
or μg/m
3
. A small
14
C (carbon 14) element inside of the BAM 1020 provides a constant source of beta
rays. The beta rays traverse a path through which glass fiber filter tape is passed before being
detected with a scintillation detector. At the beginning of the measurement cycle the beta ray count
(I
0
) across clean filter tape is recorded. Then, an external pump pulls a known volume of PM-laden air
through the filter tape thereby trapping the PM on the filter tape. At the end of the measurement cycle
the beta ray count (I
3
) is re-measured across PM-laden filter tape. The ratio of I
0
to I
3
is used to
determine the mass density of collected PM on the filter tape. A complete description of the
measurement cycle is included in Section 5.1. In addition, a scientific explanation of the theory of
operation and the related equations is included at the back of the manual.

BAM 1020-9805 Manual Rev A.docx Page 7
1.4 Beta Radiation Safety Statement
The Met One Instruments BAM 1020 contains a small
14
C (carbon 14) beta radiation-emitting source.
The activity of the source is 60 Ci ±15 Ci (microcuries), which is below the “Exempt Concentration
Limit” of 100 µCi as determined by the United States Nuclear Regulatory Commission (US-NRC). The
owner or operator of the BAM 1020 is not required to have a license to possess or operate the
equipment under US-NRC regulations. The owner may however elect to return the monitor to Met
One Instruments for recycling of the
14
C source when the monitor has reached the end of its service
life, although is under no obligation to do so. Under no circumstances should anyone but factory
technicians attempt to remove or access the
14
C source.
14
C has a half-life of about 5730 years and
should never need to be replaced. Neither the
14
C source nor the detector are serviceable in the field.
Should these components require repair or replacement, the BAM 1020 must be returned to the
factory for service and recalibration.
1.5 BAM 1020 US-EPA Configurations
The BAM 1020 is US-EPA designated for PM
10
, PM
2.5
and PM
10-2.5
under the following designation
numbers:
 Designation Number: EQPM-0798-122 (PM
10
)
 Designation Number: EQPM-0308-170 (PM
2.5
with BGI/Mesa Labs VSCC™ or Tisch Cyclone)
 Designation Number: EQPM-0715-266 (PM
2.5
with URG Cyclone)
 Designation Number: EQPM-0709-185 (PM
10-2.5
with BGI/Mesa Labs Cyclones)
US-EPA designated methods using the BAM 1020 are modified from time to time in order to reflect
hardware or software improvements. These modifications do not impact previously designated
configurations of the BAM 1020 but may provide the end user with a product upgrade path that will
allow the monitor to continue to be operated as a US-EPA designated method. For further details,
please contact our service department. Details concerning US-EPA designated configurations of the
BAM 1020 may be found on the US-EPA website:
https://www.epa.gov/amtic/air-monitoring-methods-criteria-pollutants
1.6 BAM 1020 Other Configurations
The BAM 1020 is used worldwide. Although many international jurisdictions use the US-EPA
configurations, others do not. Consult with the appropriate local monitoring authority for details on
how the BAM 1020 should be configured and operated locally.

Page 8 BAM 1020-9805 Manual Rev A.docx
1.7 BAM 1020 Specifications
PARAMETER SPECIFICATION
Measurement Principle Particulate Concentration by Beta Attenuation.
U.S. EPA Designations
PM
10
: EQPM-0798-122
PM
2.5
EQPM-0308-170
PM
2.5
EQPM-0715-266
PM
10-2.5
EQPM-0709-185
Standard Range 0 - 10.000 mg/m
3
(0 – 10,000 g/m
3
)
Accuracy Exceeds US-EPA Class III PM
2.5
FEM standards for additive and multiplicative
bias
Lower Detection Limit < 4.8 g/m
3
(2σ) (1 hour) (< 4.0 g/m
3
typical) (8-minute count time)
Lower Detection Limit < 1.0 g/m
3
(2σ) (24 hour)
Measurement Cycle Time 1 hour
Flow Rate 16.67 liters/minute
Filter Tape Glass fiber filter
Span Check Nominally 800 μg/cm
2
Beta Source C-14 (carbon-14), 60 µCi ±15 µCi (< 2.22 X 106 Beq), Half-Life 5730 years
Beta Detector Type Photomultiplier tube with scintillator
Operating Temp. Range 0° to +50°C
Ambient Humidity Range 0 to 90% RH, non-condensing
Humidity Control Actively controlled inlet heater module
Approvals U.S. EPA, MCERTS, CE, NRC, TUV, CARB, ISO 001
Standard User Interface 4.3” graphic color touch screen display
Analog Output Two channels; 0-1, 0-2.5, 0-5 VDC
Serial Interface
One (1) full duplex RS-232, one (1) half duplex RS-485 serial port for PC or
modem communications
One (1) USB Type B serial port
One (1) Ethernet port
Two (2) RS-485 serial ports for sensor network
Alarm Contact Closure 1 channel; dry NO contact; 1 A at 125 VAC or 60 VDC maximum.
Compatible Software Air Plus™, Comet™, HyperTerminal
®
Error Reporting User-configurable. Available through serial port, display, and relay outputs
Memory 14,000 records (1.5 Years @ 1 record/hr)
Power Supply 100-240 VAC 50/60 Hz universal input; 12 VDC, 8.5 A output
Power Consumption Unit: 12W; Heater: 100W/175W; Medo Pump 150W; GAST Pump 530W
Weight 19 kg (42 lbs) without external accessories
Unit Dimensions H x W x D = 36.2cm x 48.3cm x 46.7cm (14.25” x 19” x 18”).
Specifications may be subject to change without notice.

BAM 1020-9805 Manual Rev A.docx Page 9
Table 1-3 BAM 1020 Specifications
2 SITE SELECTION AND INSTALLATION
2.1 Unpacking, Inspection, and Evaluation Testing
If any damage to the shipment is noticed before unpacking, a claim must be filed with the
commercial carrier immediately. Notify Met One Instruments after notification of the commercial
carrier.
Unpack the BAM 1020 and accessories and compare them to the packing list to make sure all of the
required items are included for the type of installation planned. A separate quick setup guide with
color photos of most of the common accessories will be included with this manual. Operators can use
the quick setup guide to fully configure and operate the BAM 1020 on a test bench if desired.
The BAM 1020 is shipped with one or two white foam rings and a white plastic shim inside the front of
the BAM 1020, which prevent the moving parts of the tape control assembly from being damaged
during transit. The rings and shim should be replaced when the BAM 1020 is being transported in
order to avoid damaging the tape control mechanism. Do not ship or transport the BAM 1020 with
filter tape installed. Met One Instruments, Inc. recommends keeping the special shipping box and
foam packing material which the BAM 1020 came in as they could be re-used if the BAM 1020 needs
to be transported to another site or returned to the factory for any reason.
2.2 Enclosure Selection and Temperature Control
The BAM 1020 monitor is not weatherproof. It is designed to be mounted in a weatherproof, level, low
vibration, dust free, and temperature-stable environment where the operating temperature is between
0
o
C and +50
o
C, and where the relative humidity is non-condensing and does not exceed 90%. There
are two standard configurations described below for providing a weatherproof location in which to
install the BAM 1020. Please contact Met One Instruments, Inc. for advice if there is a need to use a
non-standard mounting or enclosure configuration.
1. A walk-in shelter or building: These are usually semi-portable pre-fabricated shelters or
portable trailers with a flat roof, or a room in a permanent building or structure. The BAM 1020
may be placed on a workbench or mounted in an equipment rack. The inlet tube of the BAM
must extend up through a hole in the roof of the structure with appropriate sealing hardware.
AC power must be available. Instructions for this type of installation are included in this section
of this manual.
2. BX-902/903/906 mini weatherproof enclosures: these small pre-fabricated enclosures are
just big enough for the BAM and related accessories and are installed on the ground or on the
roof of a larger building. They are available with a heater (BX-902), or with a heater and air
conditioner (BX-903). A dual-unit air conditioned mini shelter is also available (BX-906). These
enclosures are all specified by Met One to accept the BAM 1020, and are supplied with a
supplemental installation manual.
Shelter Temperature Control Notes: The air temperature inside a BAM shelter or enclosure is not
required to be regulated to any specific narrow range or set point (such as 25 °C), subject to the
following caveats:

Page 10 BAM 1020-9805 Manual Rev A.docx
1. The shelter temperature must stay between 0 and 50 °C inside at all times or alarms and
failures may result. Remember that the vacuum pump and inlet heater can contribute
significantly to shelter heating.
2. The exact shelter temperature within the 0-50 °C range is not critical. However, temperature
changes during the measurement cycle can lead to measurement artifacts. These artifacts,
when present tend to present only during hourly measurements and are generally insignificant
when daily averages are calculated.
3. BAM 1020 users in hot climates where the ambient temperature exceeds 40 °C should
consider using the model BX-903 air conditioned mini shelter or an air conditioned walk-in
shelter to avoid over-heating the BAM 1020.
4. The portion of the inlet tube inside of the shelter or building should always be adequately
insulated. This is especially important when the equipment is operated under conditions of high
ambient dew point. Otherwise condensation could occur inside the sampling tube and/or
measurement artifacts could result. If this proves to be an issue, the user may consider
increasing the temperature inside the shelter to a point closer to ambient temperature. The
BAM 1020 should not be placed directly in the path on an air conditioning vent.
2.3 Site Selection and Inlet Positioning Criteria
Met One Instruments, Inc. recommends checking for local regulations and guidance documentation
that may exist before selecting the site in which to install the BAM 1020. For example, US-EPA
provides a variety guidance documents where site selection issues are addressed. Such guidance
and regulation may provide information concerning:
1. Inlet height
2. Spacing and clearance
3. Proximity to particulate sources, both mobile and stationary
4. Additional siting criteria or considerations
These details should be understood before selecting a site.
2.4 Mounting Options in a Walk-In Shelter
When the BAM 1020 is to be located in a walk-in shelter, it may be installed in either an equipment
rack or on a bench top. Take the following into account when planning the mounting:
 Rear Access: It is important to leave plenty of access to the rear of the BAM 1020 for wiring
connections and maintenance. At least five inches is required. Full access to the back is
recommended whenever possible. There must be adequate access to the power switch
located on the back of the instrument.
 Top Access: It is necessary to have a minimum of eight inches clearance between the top of
the BAM 1020 inlet receiver and the bottom of the shelter ceiling to accommodate the smart
inlet heater.
 Mobile Shelters: If the BAM 1020 is being installed into an equipment rack in a mobile trailer
or van, then additional care should be taken to ensure that the mounting can handle the
additional strain. The foam shipping rings must also be inserted any time a mobile shelter is
moved with the BAM 1020 inside.

BAM 1020-9805 Manual Rev A.docx Page 11
 Rack Modifications: It is usually necessary to modify the top plate of the equipment rack by
cutting a 2 inch diameter (75mm) hole to allow the inlet tube to extend through to the ceiling.
The BAM 1020 dimensional drawings below show the location of the inlet. Note: The inlet
heater installs onto the inlet tube two inches above the top of the inlet receiver of the BAM
1020. If the BAM 1020 is to be mounted in a rack, it will be necessary to leave extra room
above the BAM 1020 in the rack for the heater, or to make the hole in the top of the rack larger
in order to clear the heater diameter. The heater is supplied with a foam insulation sleeve
which may be modified as needed. Make sure these parts are going to fit before installing the
BAM 1020.
2.5 BAM 1020 Installation Instructions
When installing the BAM 1020 into a shelter or structure the following issues should be taken into
consideration.
1. Roof Modifications: Determine the exact location where the BAM inlet tube will pass through
the roof of the shelter and drill a 2 ¼” or 2 ½” (60mm) diameter hole through the roof at that
location. Make sure the hole is directly above where the inlet receiver is to be located, so the
inlet tube will be perfectly vertical. A plumb weight is useful for determining where to locate the
hole. Note that the inlet receiver on the BAM 1020 is slightly off-center! BX-902/903 mini
shelters do not require any roof drilling.
2. Waterproof Roof Flange: Apply all-weather silicone caulking around the top of the hole and
install the BX-801 roof flange onto the hole. The threaded barrel of the flange is usually
installed downward. Secure the flange in place with four lag bolts or self-tapping screws (not
supplied). Caulk around the screws to prevent leaks. Apply Teflon tape to the threads of the
gray plastic watertight fitting and screw it into the roof flange tightly. BX-902/903 mini shelters
come with a roof flange installed, and only need the watertight fitting. Note: Some users prefer
to fabricate their own roof flange instead of using the one supplied by Met One Instruments,
due to factors such as high snow loading or a sloped roof. Equipment damage from a leaking
roof is not covered under warranty.
3. Inlet Tube Installation and Alignment: Remove the threaded cap and rubber seal from the
watertight inlet tube seal assembly. This makes it easier to install the inlet tube since the
rubber seal is a tight fit. Lower the inlet tube through the flange assembly and into the inlet
receiver on the BAM 1020, making sure that the inlet tube is fully seated. It is very important
for the inlet tube to be perpendicular to the top of the BAM 1020. The nozzle may bind if the
inlet is misaligned. A simple check is to rotate the inlet tube back and forth by hand before
tightening the roof flange seal or the BAM 1020 inlet set screws. If the inlet tube is straight,
then the tube should rotate fairly easily while inserted into the BAM 1020. If it does not rotate,
check the inlet tube for vertical alignment or move the BAM 1020 slightly.
It is always recommended that the exposed portion of the inlet tube inside the shelter
be insulated.

Page 12 BAM 1020-9805 Manual Rev A.docx
4. Smart Inlet Heater Installation: Before tightening the inlet tube in place, the BX-827 or BX-
830 smart inlet heater (used on most BAM 1020 monitors) must be installed onto the tube. Lift
the inlet tube out of the top of the BAM 1020, and pass the tube through the hole in the heater
body (the cable end is the bottom). Then re-insert the inlet tube into the BAM. Position the
bottom of the smart heater unit two inches above the top of the inlet receiver on the BAM, and
securely tighten the two set screws in the heater to fasten it to the tube.
Included with the smart heater is a 12” tube of white insulation. The tube is split down its length
for easy application. Wrap the insulation around the heater body and peel back the adhesive
cover strip to secure in place. The insulation may be cut to fit if needed. The insulation sleeve
provides more consistent heating, and prevents items from coming into contact with the hot
heater body.
5. Smart Heater Electrical Connections: All generations of the BX-827/830 Smart Heater have
the same 3-pin metal power connector. The Smart Heater connector plugs into the 3-pin
connection of the external heater relay enclosure mounted on the back panel. An A/C power
cord connects to the relay enclosure via a power entry module. The relay located inside the
heater relay enclosure is controlled by the 12VDC heater control signal.
Warning! The heater relay controls live AC line voltage to the 3-pin socket. Treat the 3-pin
socket like a live power outlet whenever power is applied. Do not open or service the heater
relay enclosure or heater module when power is applied.
Warning! The Smart Heater has triple redundant safety features to prevent overheating, but
the heater surface temperature can exceed 70 degrees C during high humidity conditions. Use
the white insulation sleeve to prevent contact with the heater during operation.
Smart Heater Back Panel Connection
6. Tightening the Inlet: After the inlet tube is aligned and the heater installed, slide the black
rubber seal and cap down over the top of the inlet tube and into the roof flange. It is easier if
the rubber seal is wetted with water first. Tighten the plastic cap. Tighten the two set screws in
the top of the BAM 1020 inlet receiver.
Heater Connector
Heater Relay Enclosure
AC Power Cable

BAM 1020-9805 Manual Rev A.docx Page 13
7. Inlet Support Struts: The BX-801 inlet kit comes with two angled aluminum struts to support
the inlet tube above the roof and prevent the inlet from moving in the wind. These struts are
typically fastened (about 90 degrees apart) to the inlet tube with a supplied hose clamp. The
bottom ends of the struts should be fastened to the roof with lag bolts (not supplied). Some
installations may require different methods or hardware for supporting the inlet tube. Support
the tube in the best manner available. The BX-902/903 mini shelters do not require inlet tube
supports.
8. Temperature Sensor Installation: BAM 1020 units are supplied with a BX-598 (AT) or BX-
597A (AT/BP/RH) sensor, which attaches to the inlet tube above the roof. The sensor cable
must route into the shelter to be attached to the BAM. Use a waterproof cable entry point or
weatherhead if the shelter has one. The BX-902/903 mini shelters have a cable entry on the
side. Route the cable into the shelter in the best manner available. In some cases, it may be
necessary to simply drill a 3/8” hole through the roof a few inches away from the inlet tube,
route the cable through the hole and caulk it to prevent leaks. The BX-597A sensor attaches
directly to the inlet tube with a supplied U-bolt.
Connect the cable to the Sensor Network on the back panel of the BAM 1020 as follows.
BX-597A Temp/RH/Pressure
Sensor
BX-598 Temp Sensor
Terminal
Block
Cable Wire
Color
Terminal
Block
Cable Wire
Color
Shield White/Brown Shield White/Brown
Gnd Black Gnd Black
RS485 - White RS485 - White
RS485 + Orange RS485 + Orange
DC Power Red DC Power Red
9. Wind Sensors: The AIO 2 or MOS-485 wind sensors may also be connected to the Sensor
Network. These sensors must be configured with address 2 in conjunction with a 597A or 598
temperature sensor (See section 2.7). Wind sensors must be mounted to avoid any possible
wind obstructions caused by the BAM inlet components. Reference sensor manuals for
mounting options.
AIO 2 Sensor MSO-485 Sensor
Terminal
Block
Cable Wire
Color
Terminal
Block
Cable Wire
Color
Shield White/Brown Shield White/Brown
Gnd Black & Green Gnd Black &
Green
RS485 - Grey RS485 - Brown
RS485 + Yellow RS485 + White
DC Power Red DC Power Red

Page 14 BAM 1020-9805 Manual Rev A.docx
10. Inlet Separator Heads: For PM
10
monitoring, the BX-802 Size-Selective Inlet is installed
directly onto the inlet tube with no cyclone. To configure the BAM 1020 for PM
2.5
monitoring,
install the PM
2.5
size fractionator below the PM
10
head as shown below. Use O-ring lubricant
as needed. Met One Instruments offers a variety of PM
2.5
fractionators for use with the BAM
1020.
11. Inlet Tube Grounding: The two ¼”-20 set screws located in the inlet receiver of the BAM
should create a ground connection for the inlet tube to prevent static electricity from building up
on the inlet tube under certain atmospheric conditions. This is also important in areas near
electromagnetic fields, high voltage power lines, or RF antennas. Check the connection by
scraping away a small spot of the clear anodizing near the bottom of the inlet tube and use a
multimeter to measure the resistance between this spot and the “CHASSIS” ground connection
on the back of the BAM 1020. It should measure only a couple of Ohms or less if a good
connection is made with the set screws. If not, remove the set screws and run a ¼-20 tap
through the holes. Then reinstall the screws and check the electrical resistance again. Note:
Anodized aluminum surfaces are non-conductive.
12. Pump Location and Installation: The best location for the vacuum pump is often on the floor
under the rack or bench, but it may be located up to 25 feet away if desired. It may be
preferable to locate the pump so that noise is minimized if the BAM 1020 is in an area where
personnel are present. If the pump is to be enclosed, ensure that it will not overheat. The Gast
pumps have a thermal shutdown inside which may trip if overheating occurs. Route the clear
10 mm air tubing from the pump to the back of the BAM 1020, and insert it firmly into the
compression fittings on both ends. The tubing should be cut to the proper length and the
excess tubing saved.
The pump is supplied with a 2-conductor signal cable which the BAM 1020 uses to turn the
pump on and off. Connect this cable to the terminals on the back of the BAM 1020 marked
“CONTROL.” The end of the cable with the black ferrite filter goes toward the BAM. Connect
the Black wire to the “Pump Black” terminal and the Red wire to the “Pump Red” terminal.
Connect the other end of the cable to the two terminals on the pump.
There are two pump types available for the BAM 1020. The Gast rotary vane pumps are louder
and draw considerably more power than the Medo linear piston pumps, but have better
vacuum capacity, especially at higher altitude or in 50 Hz applications. The Medo pumps are
smaller, quieter, and more efficient, but aren’t recommended for 50 Hz use.
13. Optional Connections: Newer data loggers often interface to the BAM 1020 using the digital
serial ports for better accuracy. Information about this is also found in Section 7. Met One can
also supply additional technical bulletins on the subject.
The BAM 1020 has a variety of other connections: Alarm relay, analog outputs, Ethernet and
serial port connections located on the back as shown in Figure 2-4 below . These items are
described in Section 7 of this manual.

BAM 1020-9805 Manual Rev A.docx Page 15
Figure 2-1 Typical BAM 1020 Installation in a Walk-in Shelter

Page 16 BAM 1020-9805 Manual Rev A.docx
Figure 2-2 Typical BAM 1020 Installation in a BX-902 Mini Enclosure

BAM 1020-9805 Manual Rev A.docx Page 17
Figure 2-3 BAM 1020 Mounting Dimensions

Page 18 BAM 1020-9805 Manual Rev A.docx
Figure 2-4 BAM 1020 Rear Panel Connections

BAM 1020-9805 Manual Rev A.docx Page 19
2.6 BAM 1020 Power and Electrical Service
The BAM 1020 uses internal 12VDC motors for the tape control system. The external 12VDC power
supply accepts 100-240VAC at 50-60Hz. The external vacuum pump and inlet heater are AC
powered and voltage-specific. Note: The vacuum pump power cord is hardwired and may need to be
replaced or adapted to match local outlet types outside of North America.
Warning: The shelter and/or electrical service must be wired for the correct voltage and frequency in
accordance with local electrical codes. Running the vacuum pump or inlet heater on incorrect line
voltage or frequency will cause improper operation.
The current draw of the system varies considerably depending on optional accessories and
environmental conditions. A dedicated 15 Amp electrical circuit is generally adequate to run a single
complete BAM 1020 system, unless a large air conditioner is on the same circuit. Consult a qualified
electrician if unsure. A summary of some worst-case loads is given below:
Model Description Amps Wattage
BAM 1020 BAM 1020 only, 120V, worst case with tape transport motors running. 1.02A 12W
BX-126 Medo Linear Piston Pump, 120V, 60Hz, at 16.67 L/min through clean tape. 1.25A 150W
BX-121 Gast Rotary Vane Pump, 120V, 60Hz, at 16.67 L/min through clean tape. 4.44A 530W
BX-122 Gast Rotary Vane Pump, 230V, 50Hz, at 16.67 L/min through clean tape. 2.30A 530W
BX-827 Smart Inlet Heater, 120V, 60Hz, running at 100% high RH duty cycle. 0.85A 100W
BX-830 Smart Inlet Heater, 230V, 50Hz, running at 100% high RH duty cycle. 0.76A 175W
BX-902B Shelter One Mini Shelter, 120V, worst case with shelter heater ON 4.2A 500W
BX-903 Ekto Mini Shelter, 120V, 2000 BTU air conditioner. 7.4A 586W
BX-904/906 Ekto Mini Shelter, 120V, 4000 BTU air conditioner. 13.5A 1172W
Table 2-1 BAM 1020 Power Requirements
Notes:
 The BAM transport motors only run for a few seconds each per hour. Quiescent BAM current is 760mA.
 The vacuum pump runs for either 42 or 50 minutes per hour. Startup inrush current is higher.
 Smart Heater wattage drops to idle at 20% (120V) or 6% (230V) when filter RH is below 35%.
 The BX-902B shelter heater is usually off whenever shelter temp is over 40 degrees F and can be disabled.
 Values are based on measurements or best available information. Additional information is available from Service.
Fuse: There is one 5x20mm, 2.0A, 250V SLO BLO fuse in an inline fuse holder
located inside the BAM 1020 near the power switch. It can be accessed by
removing the BAM 1020 enclosure cover.
Power Outages and Battery Backup: Any momentary AC power outages will
reset the BAM 1020 CPU and prevent data collection for the sample hour. The
BAM 1020 may be plugged into a PC-style uninterruptible power supply (UPS)
battery back-up unit to prevent this. A UPS of at least 300 Watts is usually
sufficient. The vacuum pump does not need to be connected to the UPS, because
the BAM 1020 can compensate for short pump flow outages of less than 1 minute
duration. If the pump is to be backed up, then a much larger UPS wattage is
required.
Chassis Ground: Connect the ground marked “CHASSIS GROUND” on the back of the BAM 1020
to an earth ground point using the green/yellow ground wire supplied with the BAM 1020. A copper
earth-ground rod is recommended. The chassis ground is primarily for added RFI/EMI noise
immunity. The power cord also uses the standard electrical safety ground.

Page 20 BAM 1020-9805 Manual Rev A.docx
2.7 Configuring External Sensors
The BAM 1020 must have a 597A or 598 sensor connected and properly configured for operation. If
the sensor is not present, the BAM 1020 will not begin sampling.
2.7.1 Configuring the BX-597A / BX-598 Sensor
The BAM 1020 requires the sensor at address 1 of its serial network to begin sampling. Once the
physical connections are made (see section 2.5), the sensor is programmed using the Digital Link
screen located in the Test Menu 2 (see section 3.5).
Upon entering the Digital Link screen, any digital
sensor connected to the BAM 1020 with address
1 or 2 will appear in either the Sensor 1 or Sensor
2 fields, as appropriate. In addition to the sensor
type, the address fields on this screen also
display the firmware currently installed in the
sensor. This screen (right) shows a two sensor
configuration.
Figure 2-5 Digital Link Screen
The State field indicates that the BAM 1020 is either starting up digital communications or waiting for
a response from the sensor. If firmware revision is missing or incorrect, communications are not
properly established with the sensor. The SETUP button provides access to the Digital Setup screen
for configuring the addresses of the digital sensors. See section 2.7.2 for details.
2.7.2 Changing Sensor Addresses
The default address for most digital sensors provided by Met One Instruments, Inc. is to set the
address to 1.
If a connected sensor has an address other than
1 or 2, it can be located in the Digital Setup
screen by pressing the SCAN button. The digital
sensor network will scan through all potential
network address nodes in an attempt to locate
any connected devices. Progress of this scan
can be seen in the third address field label (which
displays Addr 3, by default) and the word
“Scanning” will appear in the field itself.
Figure 2-6 Scanning for Sensors