Dust Monitor Model ES-642

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Met One's ES-642 Remote Dust Monitor is an industrial air-quality sensor designed to provide accurate measurements of particle concentration in both indoor and outdoor environments. The unit is supplied in a rugged weatherproof enclosure. It includes an LCD display to provide informatin about particulate concentration, flow rate, instrument status and power. The electronics and optical system are protected from moisture by a built-in intake heater that is humidity level controlled. The heater power is regulated to maintain a minimum humidity level. Additional features include a purge air system and an automatic zero calibration routine.

The sensor can be wall mounted or installed on a vertical mast up to 3 inch in diameter.

The ES-642 is supplied with a 10ft cable and connector for power (15 to 40 VDC) and signal output.

The ES-642 measures particulate concentration using a highly sensitive forward scatter laser nephelometer, having a measurement range of 0 to 100 mg/cubic meter or 0 to 100,000 ug/cubic meter. Optional sharp-cut cyclones are used to set the measure level of the ES-642. As supplied, it provides particulate montioring for TSP, but with the addition of the sharp-cut cyclone it can be set for particulate smaller than PM10 or smaller than PM2.5 or PM1. The accuracy of the instrument is +/-5% based on a traceable PSL 0.6 micron reference standard.

Measurement Principles: Particulate concentration by forward light scatter laser Nephelometer
Availabile Cut Points: TSP Inlet Standard. PM10, PM2.5, and PM1 sharp-cut cyclone inlets available
Measurement Range: 0 to 100 mg/m3 (0 to 100,000 μ g/m3 )
Measurement Sensitivity: .001 mg/m3 .
Nephelometer Accuracy: 0.1 to 100 micron. Optimal sensitivity 0.5 to 10 micron particles.
Particle Size Sensitivity: 0.1 to 100 micron. Optimal sensitivity 0.5 to 10 micron particles.
Display: 2 X 16 backlit LCD. Provides information on operation including: Power, Flow Operation, Status and Concentration.
Zero Calibration: Automatic Zero Calibration every hour or as programmed from 1 to 999 minutes.
Flow Rate: 2.0 liters/minute ± 0.1 lpm.
Power: 15 – 40 VDC @ 1.5 A maximum.
Power Consumption: 350 mA (no heater) 1.1 A (with heater) @ 15 VDC
Analog Output: 4-20 mA and 0 – 10 VDC
Digital I/O: RS-485 full and half duplex, RS-232
Serial Communication: 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
Factory Service Interval: 24 Months typical, under continuous use in normal ambient air.
Mounting Options: Wall mount bracket standard. Optional EX-905 tripod
Unit Weight: 2.27 kg ( 6.0 lbs)
Unit Dimensions: 22.9cm high, 17.8cm wide, 10.8cm deep. (9.0” x 7.0” x 4.25”). w/out inlet assy. 48.3cm high, 17.8cm wide, 10.8cm deep. (19.0” x 7.0” x 4.25”). w/ inlet assy.
  • Designed to provide accurate information on paricle concentration and operate continuously in adverse environments.
  • Special features such as the purge air system and automatic zero calibration enable the monitor to operate 24/7.
  • A sheath air system isolates the aerosol in the chamber to keep the optics clean for long term reliability and low maintenance.
  • LCD display provided information on operation including: power, heater power, flow operation, status and particulate concentration.

Industrial Outputs

  • Serial ASCII Text
  • RS-232 and RS-485
  • 0-10V Analog Signal
  • 4-20 mA Analog Signal


  • Automatic zero calibration
  • Controlled input heater
  • Easily removable filters
  • Contact closure alarm output
  • Front panel LCD display
  • Sealed environmental enclosure


  • Military Applications
  • Bulding Automation
  • Environmental Cleanup Sites
  • Air Pollution Level Monitoring
  • Dust Level Warning Systems
  • Mining

The unit does not include any datalogging or power source. 

Standard with the Model ES-642:

  • Weatherproof TSP Inlet with debris screen
  • Multi-Signal cable (10ft)
  • Instruction Manaul
  • 3/16" Allen wrench
  • Mounting ears
  • Wall mouting bracket and V-Bolts
  • Certificate of calibration


  • SCC 110 Sharp Cut Cyclone PM10
  • SCC 111 Sharp Cut Cyclone PM1.0
  • SCC 112 Sharp Cut Cyclone PM2.5
  • EX-905 Tripod for ES-642
  • 81039 Solar Shield for ES-642

Dust Monitor Model ES-642
Item # ES-642 

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Product Image of Dust Monitor Model ES-642