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BAM-1020Beta Attenuation Mass Monitor
PM2.5 and PM10 Federal Equivalent Method
Met One Instruments, Inc.
August 2009
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Typical Configurations
The BAM-1020 is designated as a class III U.S. EPA PM10 or PM2.5Federal Equivalent Method (FEM) monitor, when equipped with
the appropriate settings and accessories.
For PM2.5 FEM monitoring, the unit must use the EPA-mandatedBGI VSCC-A PM2.5 cyclone, along with the normal PM10 inlet, the
BX-596 AT/BP sensor, and the BX-827 Smart Inlet Heater. The
unit is operated with standard glass fiber filter tape, and actual
volumetric flow control.
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Typical Configurations
For PM10 monitoring, the cyclone is omitted, and unit is operatedwith standard glass fiber filter tape, actual flow control, and
standardized flow and concentration reporting.
A pair of BAM-1020 units are also configurable for PM10-2.5 (PM-coarse) monitoring by connecting the two units together with a BX-
COARSE kit. This provides PM10, PM2.5, and PM10-2.5
measurements all at once.
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Typical Configurations
The BAM-1020 can be set up on a
workbench with all accessories for
acceptance testing and evaluation in
a matter of only minutes.
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The BAM-1020 is frequentlyinstalled inside a walk-in
shelter with a variety of other
instruments.
Any length of inlet tube canbe supplied, up to 16.
A 2 hole in the roof is
required.
Bench-top or rack mountable.
Typical
Configurations
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The BAM-1020 is often
installed inside a small
weatherproof enclosure.
Air conditioned, heated, and
dual-BAM enclosures areavailable from Met One.
There is enough room inside
for dataloggers or telemetry
equipment.
Typical
Configurations
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Operation
At the beginning of the hour, a small Carbon 14element emits beta rays through a clean spot of
filter tape to determine a zero reading. The BAM advances this exact spot to the sample
nozzle where air containing particulate is sampled
onto the filter tape.
At the end of the hour, the same exact dirty spot is
placed back at the source where is it re-measuredwith beta rays.
The dirty tape absorbs more beta rays than theclean spot did. The difference between the two
measurements is related to the mass concentration
by a variation of Beers Law.
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Operation
The BAM-1020 always makes a separate concentrationmeasurement on a fresh spot of tape each hour.
An automatic hourly membrane foil measurement verifies the
span stability of the unit. The beta attenuation method is virtually unaffected by the
chemical or elemental composition of the sampled particulate.
A smart inlet heater controls the RH of the sampled air.
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Maintenance
The BAM-1020 filter tape roll will last just over 60 days.
The cyclone and PM10 head particle traps should becleaned on a monthly basis.
BAM-1020 leak checks, nozzle/vane cleaning, and flow
audits are the three critical maintenance items, and areusually performed on the same monthly basis. Complete
maintenance and audits can usually be performed in less
than 15 minutes.
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Maintenance
A leak check is always performed during flow audits as a datavalidation check. A flow leak is basically the only problem that the
BAM-1020 may not automatically detect. Unresolved leaks may
cause positive or negative concentration errors.
The sample nozzle and tape support vane must be kept clean toprevent nozzle leaks.
Flow audits consist of simpleambient temperature, barometric
pressure, and air flow checksusing the same traceable
reference devices that would be
used for an FRM sampler.
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Data Collection
The BAM-1020 has a powerful built-in datalogger to store up to182 days worth of all data parameters and alarms.
Data may be collected from the BAM through the serial port usinga separate digital datalogger, or a computer and simple software.
The ESC 8832, Campbell CR1000, and Dr DAS dataloggers areare all widely used with the BAM-1020, especially when other airmonitors are also being operated at the same site.
BAM serial data may be obtained through phone, cell, radio,satellite, or IP addressable modems.
Complete error logs, settings files, and flow statistics files are alsoavailable from the BAM through the serial port.
BAM concentration data may also be obtained through a 0-1 voltanalog voltage output channel.
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Contacts
Sales: David Gobeli, Ph.D.Jo Ann PottbergPeter Pomponi
Science: Herbert Schloesser, Ph.D.
Engineering: Dennis Hart
Service: Mike Putnam, Service Mgr.
Phone: (541) 471-7111 Web: www.metone.com