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Durag D-R 290 Optical opacity-dust monitor

Categories: Dust & Particulate Monitors, Manual & Automatic Stack Testing Equipment,
Brand: ,

The DURAG D-R 290 has been used successfully for more than 15 years in various applications as reliable and low maintenance opacity / dust monitor. Now in its 2nd generation, the D-R 290 is a certified optical transmission monitor to measure the opacity or dust concentration of flue gases with medium to high dust concentrations.

The D-R 290 uses the double-pass method according to the auto-collimation principle. The light beam traverses the measuring path twice. The attenuation of the light beam by the dust content in the measuring section is measured and evaluated.

Key Benefits

  • Continuous and contact-less measurement
  • Automatic zero and span check
  • Automatic measurement and correction of contamination of optical surfaces
  • Extremely powerful and stable super-wide band diode (SWBD) light source
  • Extremely low-maintenance
  • Fail-safe shutters with purge air monitoring as option
  • Certified according to EN 15267-3
  • Compliant with US EPA 40 CFR 60 PS1 and ASTM 6216

Advantages of the new generation

  • Digital Modbus interface according to VDI 4201-3
  • Convenient operation with remote access option
  • All settings can be changed without opening the device
  • Compatible with universal display and control unit D-ISC 100


Suitable for dust concentration measurement

  • on incineration plants
  • on power plants
  • on cement plants
  • in the metal industry
  • on plants according to IED 2010/75/EC
  • on converter plants and asphalt mixing plants
  • on plants for the incineration of biomass

Suitable for measuring the opacity of flue gas

  • on plants in accordance with U.S. EPA 40 CFR 60 PS1, special MCOC required
  • on cruise and container ships.

Suitable for measurement of dust load in warehouses



Stack, Process & CEMS


Sample gas type Air, flue gas, non flammable process gas
Sample gas temperature Above dew point up to 250 °C (482 °F) standard,
optional up to 1000 °C (1832 °F)
Inner duct pressure -50…+20 hPa (optional higher)
Sample gas relative humidity 0…95% RF, non-condensing
Stack/duct inne diameter 1…18 m (3.3…59.1 ft)
Measuring principle Measuring the optical transmission of visible light which passed a measuring path twice.
Conformities IED 2010/75/EU
EN 13284-2, EN 14181
EN 15267-3
40 CFR 60 US EPA PS1
40 CFR 60 US EPA PS11
Certificates CE, COC QAL1 DIN EN 14181 / DIN EN ISO 14956 / EN 15267-3, MCERTS, Pattern Approval GOST R, Pattern Approval certificate Rep.of Belarus, Pattern Approval Certificate PRC, MCOC 40CFR 60 EPA PS1
Measuring location In-situ, non-contact
Self-check, protective functions Automatic zero- and span check
Automatic soiling correction
LED light source: no readjustment needed
Automatic fail safe shutter in case of purge air failure (option)
System components D-R 290 M xx2 measuring head
D-R 290 R xx2 reflector
D-ISC 100 Universal operating and display unit
D-BL purge air unit
D-R 290 E mounting flange with tube
D-SK fail safe shutter (option)


D-R 290 M 2nd-gen MEASURING HEAD
Physical measuring value Optical density/ extinction, opacity
Derived measuring values Transmission, opacity (SP), extinction, dust concentration in mg/m3, mg/Nm3 (after gravimetric calibration)
Measuring range opacity 0…20% … 0…100%
Output range opacity Freely programmable
Measuring range extinction 0…0.1 … 0…2.0
Output range extinction Freely programmable within the measuring range
Measuring range dust concentration 0…10000 mg/m3 (depending on calibration)
Output range dust concentration Freely programmable within the measuring range
Lowest detection limit 0.75% for measuring range 0…0.1 extinction
Combined standard uncertainty acc. to QAL1, DIN EN 14181 1.8%, related to the certified measuring end value 15mg/m3
Light source, spectral range 450…680 nm, SWBD LED white
Process connection Connection flange, bolt circle 100 mm, tube ID = 59 / 83 / 105 mm
Digital interfaces RS 485 Modbus RTU, bi-directional communication
Mini-USB (service)
Analog outputs 1x 4-20 mA, 400 Ohm, potential free, assignment programmable
Digital outputs 2x contact NC/NO, max. load 60 VDC /
30 VAC / 0.5 A
assignment programmable, typically: maintenance, failure
Power supply 24 VDC, 0.5 A
Ambient temperature (operational) -40…+60 °C (-40…140 °F)
IP protection class (IEC 60529) IP65
EX zone Option: Ex II 3G Ex pz II T4, Ex II 2G Ex px II T4
Dimensions (hxwxd) 370 x 190 x 400 mm
Weight 10 kg
Material Aluminium, painted blue RAL 5017
D-R 290 M 2nd-gen REFLECTOR
Process connection Connection flange, bolt circle 100 mm, tube ID = 59 / 83 / 105 mm
Ambient temperature (operational) -40…+60 °C (-40…140 °F)
IP protection class (IEC 60529) IP65
Dimensions (HxWxD) 370 x 190 x 270 mm
Weight 7 kg
Material Aluminum, painted blue RAL 5017
Bronwyn Straccione

Bronwyn Straccione

Category Manager - CEMS and Gasmet

Hi there, I'm Bronwyn. I've been with TES for 15 years and I'm the Category Manager for our Gasmet and CEMS equipment sales. My usual work days are Monday - Wednesday. If there's something I can help you with, please give me a call on 0404 161 353 or send me a message and myself or your local sales support will be in touch shortly!

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