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D-R 808 long probe

D-R 808
Dust monitor

For continuous measurement of low to medium dust concentrations in dry flue and process gases. Single-sided installation for difficult plant conditions.  


Functionality: Forward scattering

  • Continuous dust measurement
  • Smallest certified measuring range 0 … 7.5 mg/m3
  • Single-sided installation without optical alignment
  • Automatic control functions
  • Continuous, integrated purge air monitoring
  • Maintenance and linearity check without disassembly
  • Suitable for official emission monitoring
  • Reliable measurement of small dust concentrations
  • Space-saving and easy installation
  • Reliable emission monitoring
  • Long service life
  • Emission measurement of dry flue gases at the stack
  • Measurement of dry process gases with small concentrations
  • Technical data
  • System components
Measuring principleForward scattering, in-situ measurement, single-sided installation
Measuring variableStray light units, calibratable as dust concentration in mg/m³
Measuring rangeMinimum 0 … 5 mg/m³Maximum 0 … 200 mg/m³
Certified measuring range 0 … 7.5 mg/m³
Ambient conditionsInstallation location: Indoor or outdoor installation**Temperature: -40 … +60 °C
Operating conditions in ductTemperature: Maximum 350 °C, optional 500 °CRelative humidity: 0 … 95%, non-condensingRelative pressure: -50 … +50 hPa
Duct dimensionsMin. inner diameter: 0.3 mMax. wall thickness: 0.47 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
Control functionsAutomatic zero point and reference point measurement, automatic contamination measurement and compensation, integrated purge air monitoring
Light sourceLaser, class II, < 1 mW at 650 nm

* Additional interfaces with D‑ISC 100 operating unit

** Weather protection cover required for outdoor installation

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

Dust monitor D-R 808
Software D-ESI*
Terminal Box with purge air unit D-TB 200 or
Terminal Box without purge air unit D-TB 100** or
Operating and purge air unit D-ISC 100 P

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

** External purge air supply required

  • Maintenance and linearity check without disassembly
  • Mandatory
  • Recommended
D-TB x00
D‐ESI 100
D-ISC 100 xx2