D-R 820 F

Extractive measurement of humid flue or process gases. For monitoring small to medium dust concentrations. 


  • Dilution of the sample
  • Hyperkinetic gas extraction
  • Single-sided installation on stack
  • Automatic zero point and reference point check
  • Automatic measurement of contamination and correction of measured values
  • Local control panel and LC display
  • Suitable for plants with variable gas velocity
  • Long life time due to stable laser light source
  • Easy commissioning, adjustment and maintenance without PC
  • Emission measurement of humid flue gases
  • Measurement of humid process gases with small to medium concentrations


Measuring principleExtraction of sample gas, dilution and heating for evaporation of H2O, forward scattering, single-sided installation
Measuring variableStray light units, calibratable as dust concentration in mg/m³
Measuring rangeMinimum 0 … 15 mg/m³
Maximum 0 … 200 mg/m³
Certified measuring range0 … 15 mg/m³
Ambient conditionsInstallation location: Indoor or outdoor installation*
Temperature: -20 … +50 °C
Operating conditions in ductTemperature: -25 … 220 °C
Relative humidity: > 95 %, maximum 30 g/m³ H2O as aerosol
Relative pressure: -30 … +2 hPa
Duct dimensionsMinimum inner diameter: 0.4 m
InterfaceAnalogue output: 4x 4 … 20 mA, maximum 1,000 Ohm, potential-free
Digital output: 4x NC/NO, maximum 35 VDC, 0.4 A
Operation and displaySupply and display unit on the measuring device
Control functionsAutomatic zero point and reference point measurement, automatic contamination measurement and compensation
Light sourceLaser diode, red, 650 nm

* Weather protection cover required for outdoor installation


DURAG Group products and solutions under its group such as:

  • SMITSVONK (Netherlands-based) for high-energy ignition systems, pilot burners, and ignition burners
  • Hegwein GmbH (Stuttgart-based) for (gas and oil ignition burners and gas burners
  • AP2E (France-based) for ProCeas® lasercem analyzers for gas traces in hydrocarbons via infrared spectrometry online gas analysis, with no need for sample conditioning/heating
  • Grimm Aerosol Technik for detection and analysis of aerosol particles in various fields such as environmental monitoring, occupational safety and research.
  • Mercury Analysers for measuring principle that allows separate determination of elemental and oxidized mercury
  • Dust Monitors and Analysers for measure dust concentrations in dry and wet gases continuously

Approvals And Certifications

  • TÜV certificate (Germany requirement for continuous emission monitoring systems)
  • Compliant to US EPA, QAL 1 Certification, EN 14181, EN 15267, EN 16911-2
  • FM approval (ANSI safety standards)
  • Explosion Proof Certification (IECEx, ATEX, NEPSI, TIIS)
  • CE Marking (conforms with the applicable EU directive)

The DURAG GROUP is a leading provider of intelligent solutions for combustion technology, emissions and ambient air monitoring, multi-gas analysis, tunnel sensors, and environmental and process data management, with more than 70 years of experience.

The company has around 500 specialists who offer modern technology, certified instruments, and reliable services for the individual requirements of customers worldwide.

It provides a comprehensive product portfolio for industrial combustion and flame control technology, visualization and online analysis of thermal processes, gas analysis, as well as the measurement and analysis of emissions and ambient air monitoring.


D-R 820 F