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D-R 290
D-R 290 Ex

D-R 290
Dust and opacity monitor

For continuous, contactless dust and opacity measurement at medium to high concentrations in dry flue and process gases. Also suitable for difficult plant conditions. Exceeds EPA and ASTM standards.


Functionality: Transmission

  • Continuous dust measurement
  • Smallest certified measuring range 0 … 15 mg/m3
  • Automatic measurement and correction of contamination
  • Automatic check functions
  • Contactless measurement
  • Maintenance and linearity check without disassembly
  • Exceeds EPA and ASTM standards
    The D-R 290 was developed to comply with 40CFR60, App. B, PS-1 and ASTM D6216-20 Annex A1 “Standard Practice for Opacity Manufactures to Certify Conformance with Design and Performance Specifications."
  • Suitable for official emission monitoring
  • Reliable measurement of medium to large dust concentrations
  • Space-saving and easy installation
  • Long life time and high availability under extreme plant conditions
  • Emission measurement of dry flue gases at the stack
  • Temperatures up to 1,000 °C
  • Corrosive flue gases, plants with complex gas matrix
  • Measurement of dry process gases
  • Technical data
  • Explosion protection
  • System components
Measuring principleTransmission, contactless and in-situ measurement
Measuring variableExtinction, opacity, calibratable as dust concentration in mg/m³
Measuring rangeOpacity: Minimum 0 … 20%, maximum 0 … 100%Extinction: Minimum 0 … 0.1, maximum 0 … 2.0Dust concentration: Minimum 0 … 80 mg/m³, maximum 0 … 4,000 mg/m³
Certified measuring range0 … 15 mg/m³
Ambient conditionsInstallation location: Indoor or outdoor installation**Temperature: -40 … +60 °C -30 … +60 °C (ATEX)-20 … +60 °C (IECEx)
Operating conditionsIn duct:Temperature: Maximum 250 °C, optional: 1,000 °CRelative humidity: 0 … 95%, non-condensingRelative pressure: -50 … +20 hPa -50 … 0 hPa (ATEX/IECEx)
Inner duct diameter0.5***… 18 m
Interface*Analogue output: 1x 4 … 20 mA, maximum 400 Ohm, potential-free (various parameters adjustable)Digital output: 2x NC/NO, maximum 60 VDC, 30 VAC, 0.5 A (various parameters adjustable)RS 485 Modbus RTU, USBStatus display: LED
Operation and displaySoftware D-ESI 100*** orOperating unit D‑ISC 100
Check functionsAutomatic zero point and reference point measurement, automatic contamination measurement and compensation
Light sourceLED, 450 … 680 nm

* Additional interfaces with D‑ISC 100 operating unit 

** Weather protection cover required for outdoor installation

*** Measuring section > 1 m

ATEXII 2G Ex pxb IIC T4 GbII 3G Ex pzc IIC T4 GcII 3D Ex pD IIIC T100°C Dc
IECExEx pzc IIC T4 Gc
Dust monitor D-R 290 (measuring head and reflector)
Purge air unit(s) D-BL
Software D-ESI* and Terminal Box without purge air unit D-TB 100** or
Operating unit D‑ISC 100

* Enables remote access via web interface, PC with Windows operating system required

** External purge air supply required

  • Wide range of applications for almost any plant conditions
  • Mandatory
  • Recommended
D-TB x00
D‐ESI 100
D-BL
D-ISC 100 xx2