metone bam-1020 basic presentation

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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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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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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

metone bam-1020 basic presentation

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