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The E-BAM Real-Time Beta Gauge


  • Accuracy and precision consistent with U.S. EPA requirements for Class III PM2.5 and PM10 measurement.
  • Real-time, accurate results without correction factors, regardless of season or geographic location.
  • rue ambient sampling provides accurate measurement of semi-volatile nitrates and organic compounds.
  • Lightweight, rugged construction is easily mounted on a tripod in minutes.
  • All-weather construction allows for true ambient sampling.
  • Operates on AC or DC power. Battery and Solar options available upon request.

The E-BAM Real-Time Beta Gauge

The Met One E-BAM is a portable, real-time beta gauge which is comparable to U.S. EPA methods for PM2.5 and PM10 particulate measurements. The Met One E-BAM has been built to satisfy users, regulators and those from the health community by providing truly accurate, precise, real time measurement of fine particulate matter automatically. In addition, it is rugged, portable, battery operated, and deployable in 15 minutes.

Continuous Monitoring

The E-BAM automates particulate measurement by continously sampling and reporting concentration data. Data records are updated every minute. E-BAM eliminates the old process of filter collection and manual filter weighing, and eliminates the need for more expensive, high maintenance instruments. Today, with the adaptation of Beta Attenuation to ambient monitoring this process became simple, streamlined, and inexpensive.

About Accuracy

Real-time accurate, reliable, and repeatable measurement of ambient fine particulate matter has been the elusive goal of environmental regulators and health professionals for many years. Met One Instruments has developed advanced particulate monitoring instrumentation which is reliable, and is easy to operate. It will also automatically report results in near real time, eliminating the need for high levels of human intervention. Because sampling occurs under true ambient conditions semi-volatile organic compounds and nitrates are easily detected thereby avoiding under measurement.

Continuous Sampling

E-BAM is a lightweight portable instrument that operates directly in hostile environments without an exterior enclosure. E-BAM is a very robust portable sampler system that is easily installed in less than 15 minutes. No other sampler matches the portability and flexibility of the E-BAM.

Set Up

Quick setup of the E-BAM is assured with a series of prompts instructing the installer on the sequence to follow. Then the E-BAM performs a series of self test diagnostics and alerts the installer of any corrective action. Upon completion, the E-BAM automatically places itself in normal operate mode.

Particulate Size Selection

Size selective concentration measurements are made using a variety of sampling inlets. The E-BAM may be supplied with TSP (Total Suspended Particulate), PM-10, PM 2.5 or PM 1 inlets. Flow dependent cut points in the size selective inlets are maintained using integral flow meter, pressure sensor and ambient temperature sensor. The PM-10 inlet removes particles larger than 10 microns, the inlet is not affected by wind speed and wind direction. For PM 2.5 or PM 1 secondary size selection is made using a second downstream inlet.


The standard configuration of the E-BAM is a self-contained environmentally sealed aluminum enclosure placed on a rugged tripod. This system can be permanently placed on rooftops, near roads, at industrial sites, or rapidly deployed to monitor emergency situations. ‘E- ‘represents Environment Proof instrument, E-BAM has been specifically designed to work in hostile environments without additional protection.

Direct Field Reporting

Collecting real time or historical particulate data from a field site has never been easier. Advanced communication options include cellular phone, Line of Sight Radio, and for very remote sites, satellite communications are now available. E-BAM also supports the full line of standard MET ONE options, such as phone modem, and direct communications to a portable computer. E-BAM data is recorded internally and may be retrieved using one of the communication options, or data may be forwarded to third party data acquisition system. MicroMet Plus Software supports the E-BAM and provides a complete communication, data base and reporting modules with charting. Comet data retrieved software is included.

Digital, Analog and Alarm Outputs

The E-BAM provides both continuous digital and analog outputs. Analog output is selectable to several full-scale voltages. Digital output is supplied as RS-232.

Product Specifications


Range: 0 – 65 mg per cubic meter
Accuracy: 2.5 μg or 10% in 24 hour period
Measurement Cycle: Hourly measurements with 1, 5, 10, 15, or 30 min real-time averages
Beta Source: C14, less than 75 microcurie, Half life of 5730 years
Detector: Scintillation probe
Analog Output: 0-1V, 0-2.5v, 0-5V, selectable hourly or real-time output
Filter Tape: Continuous glass fiber filter
Inlet: Compatible with EPA PM10 and PM2.5 inlets
Flow Rate: 16.7 liters per minute, adjustable
Flow Accuracy: +/- 2% of reading, volumetric flow controlled
Sample Pump: Dual diaphragm type, DC powered, 4000 hr rating
Alarm Signals: Filter, flow, power and operation failure
Input Power: 12 Volts DC @ 48 Watts max
Alarm Contact Closure: 2 Amp @ 240 VAC max
Operating Temperature: -30 Deg C to 50 Deg C
Enclosure: 41 cm x 36 cm x 20 cm, 13kg


Standard Components

  • 8 Channel Datalogger
  • Internal DC Vacuum Pump Standard
  • PM10 Inlet
  • Real-Time Concentration
  • Aluminum Tripod
  • Ambient Temperature Sensor
  • Weatherproof Enclosure
  • Volumetric Flow Control
  • Filter Temperature Sensor
  • Filter RH Sensor
  • Filter Pressure Sensor
  • Calibration Membrane


Options and Accessories

  • BX-302 Zero Calibration Kit
  • EX-034 Wind speed and direction sensor
  • BX-305 Leak check valve
  • EX-121 AC Power supply, 100-240 VAC, 12 VDC output
  • BX-307 Flow Calibrator
  • EX-593 Ambient RH Sensor
  • BX-308 PM2.5 Sharp-Cut Cyclone
  • EX-996 Phone modem kit
  • EX-911 Cell modem kit
  • BX-803 TSP Inlet
  • 460130 Filter tape, roll
  • 9425 Wall mount bracket
  • Airsis Satellite modem kit
  • External AC Vacuum Pump
  • MMP MicroMet Plus Software
  • Solar Panel Array