Remote Dust Monitor ES-642

Belfort ES-642 Remote Dust Monitor is an industrial air-quality sensor designed to provide real time particle concentration measurements in both indoor and outdoor environments. It is suitable for use on construction sites, for military purposes, for civilian air pollution monitoring, etc..


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The ES-642 measures particulate concentration using a highly sensitive forward scatter laser nephelometer, which has a measurement range of 0 to 100 mg/cubic meter. As supplied, the ES-642 provides TSP particulate monitoring. Optional sharp-cut cyclones are available for PM1, PM2.5, or PM10. The ES-642 has flexible serial ports and analog outputs to support various data collection systems. The serial ports support MODBUS and simple ASCII commands via RS-232 or RS-485. Analog outputs include both 0-10 volts and 4-20 mA.

Sensor has rugged weatherproof enclosure for reliable continuous outdoor operation.  Built-in purge air system keeps optical components clean so the ES-642 can operate in adverse environments without performance degradation. Automatic Zero Calibration reduces long term measurement drift by automatically adjusting the zero value each hour. The interval is user settable from 1 to 999 minutes.

Inlet Heater control humidity levels and reduce measurement errors. Front Panel LCD Display provides information about particulate concentration, flow rate and instrument status. Mounting bracket included for wall or 5 cm vertical mast mounting. Optional mounting available for vertical mast diameters up to 120 mm.


Measurement Principle       

Particulate concentration by forward light scatter laser Nephelometer

Available Cut Points

TSP Inlet Standard. PM10, PM2.5, and PM1 sharp-cut cyclone inlets available. 

Measurement Range

0 to 100 mg/m3

Measurement Sensitivity

0.001 mg/m3

Nephelometer Accuracy

± 5% traceable standard with 0.6um PSL

Particle Size Sensitivity

0.1 to 100 micron


2 X 16 backlit LCD. Provides concentration, flow and status information

Zero Calibration

Automatic Zero Calibration every hour or as programmed from 1 to 999 minutes

Flow Rate

2.0 liters/minute ± 0.1 lpm

Input Voltage

11 – 40 VDC

Power consumption

12 VDC - 300 mA (heater off), 1.2 A (heater on)

24 VDC - 140 mA (heater off), 0.6 A (heater on)

Analog output

4-20 mA and 0 – 10 VDC

Serial ports

RS-232 and RS-485

Serial protocols

ASCII Text data format and MODBUS RTU

Alarm Output

Normally open and normally closed relay 30 VDC @ 1A maximum.

Operating temperature

-10  to + 50 ° C  (Ambient Temperature Sensor Range -30 to +50°C)

Barometric Pressure

600 to 1040 mbar pressure sensor range 

Ambient Humidity Range

0 to 90% RH, non-condensing

Intake Moisture Control

Automatic 10 Watt inlet heater module controlled to sample RH set point


178 W X 229 H X 108 D (mm) w/out inlet assy

178 W X 483 H X 108 D (mm) w/ inlet assy


2.7 kg

Factory Serivce Interval

24 Months typical, under continuous use in normal ambient air

Mounting Options

Mounting bracket standard (wall or 2” vertical mast).

Optional EX-905 tripod


Datasheet ES-642  Met_One_ES_642_Remote_Dust_Monitor_Spec_Sheet.pdf 

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Remote Dust Monitor ES-642
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