For continuous, contactless measurement of low to medium dust concentrations in dry flue and process gases. Also suitable for corrosive gases and potentially explosive atmospheres.


Functionality: Backward 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 and control
  • Maintenance and linearity check without disassembly
  • Contactless measurement



  • Suitable for official emission monitoring
  • Reliable measurement of small dust concentrations
  • Space-saving and easy installation
  • Long life time and high availability under extreme plant conditions
  • Low maintenance



  • Emission measurement of dry flue gases at the stack
  • Temperatures up to 600 °C
  • Corrosive flue gases, plants with complex gas matrix
  • Measurement of dry process gases with small concentrations


Technical Data:

Measuring principle Backward scattering, single-sided installation, contactless and in-situ measurement
Measuring variable Stray light units, calibratable as dust concentration in mg/m³
Measuring range Minimum 0 … 5 mg/m³Maximum 0 … 200 mg/m³
Certified measuring range 0 … 7.5 mg/m³
Ambient conditions Installation location: Indoor or outdoor installation**Temperature:-40 … +60 °C-30 … +60 °C (ATEX)-20 … +60 °C (IECEx)
Operating conditions in duct Temperature: Maximum 600 °CRelative humidity: 0 … 95%, non-condensingRelative pressure:-50 … +50 hPa-50 … 0 hPa (ATEX/IECEx)
Duct dimensions Minimum inner diameter: 0.7 mMaximum wall thickness: 0.56 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 display Software D-ESI 100*** orOperating unit D-ISC 100
Control functions Automatic zero point and reference point measurement, automatic contamination measurement and compensation, integrated purge air monitoring and control
Protective functions Integrated fail-safe shutter (optional)
Light source Laser, 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



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