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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.


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
  • 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