Durag D-R 808 Dust Monitor

The DURAG D-R 808 is a suitability-tested scattered light dust monitor for monitoring small to medium dust concentrations in dry flue or process gases.

With its certification range of 0 … 7.5 mg/m3 the D-R 808 is ideally suited for monitoring very low dust concentrations.

Key Benefits

  • Certified for official emission monitoring – QAL1 certified according to EN 15267-3, compliant with the requirements of US-EPA PS-11
  • Lowest certified range 0 … 7.5 mg/m3 Reliable measurement of very low dust concentrations
  • Space-saving and easy installation – One-sided installation without alignment
  • Durable through integrated purge air monitoring – Protection of the device through continuously monitored purge air supply
  • Low maintenance effort – Linearity check with reference filters without removing the device from the stack (if stack pressure is negative)
  • Reliable emission monitoring – Automatic control functions ensure reliable measuring values
  • One-sided installation without optical alignment
  • Automatic zero and reference point check
  • Automatic contamination check and correction
  • Integrated purge air monitoring


Continuous emission monitoring, for example, in the following industries:

  • Waste incineration
  • Cement industry
  • Power industry
  • Wood industry
  • Chemical industry
  • Steel industry

Process monitoring, e.g.:

  • Monitoring of filter plants
  • Monitoring of ventilation systems

Download Specifications


Stack, Process & CEMS


Flue gas type Air, flue gas, non flammable process gas
Flue gas temperature Above dew point up to +350 °C
optional up to 500 °C with additional components
Inner duct pressure -50 … +50 hPa
Flue gas relative humidity 0 … 95% rel. humidity, non-condensing
Inner duct diameter > 0.3 m
Measuring principle Forward scattering
Conformities CE
IED 2010/75/EU
US-EPA 40 CFR 60 PS-11
Certificates CE, QAL1 EN 14181:2015 / EN 15267-1:2009 / EN 15267-2:2009 / EN 15267-3:2008, MCERTS pending
Measuring location In situ, probe in contact with flue gas, one-sided installation at the stack, no optical alignment
Measuring sequence Continuous
System components D-R 808 M measuring device
D-TB 200 terminal box incl. purge air supply
D-ISC 100 universal operating unit (option)
Self-check, protective functions Automatic zero and reference point check
Automatic contamination check and correction
Integrated purge air monitoring (option)
Connector for external purge air sensor or customer protective function supplied by the customer


Physical measuring value Scattered light units
Derived measuring values Dust concentration in mg/m3 after gravimetric calibration
Normalized dust concentration in mg/Nm3 after gravimetric calibration
Measuring range dust concentration min. 0 …5 mg/m³
max. 0 …200 mg/m³
Output range dust concentration Output range freely programmable. Any range can be assigned to an analogue output.
Certified measuring range Dust concentration
0 … 7.5 mg/m³
Integration time 1 … 180 s, programmable
Light source Laser diode, 650 nm
Process connection Flange, pitch circle 100 mm, similar to DN40 PN6, di=70 mm
Digital interfaces RS 485 Modbus RTU, bi-directional communication, USB (Service)
further with D-ISC 100
Analogue outputs 1x 4-20mA, 400 Ohm, isolated, assignment parameterisable
further with D-ISC 100
Digital outputs 2 x contact NC/NO, permissible load 60 VDC / 30 VAC / 0.5 A,
function can be assigned. Typically: maintenance, failure
further with D-ISC 100
Power supply 24 VDC, 0.5 A
Operation D-ISC 100 universal operating unit (option)
Service software D‑ESI 100, incl. remote access via web interface (option), requires PC with Windows OS
Ambient temperature (operational) -40 … +60 °C
IP protection class (IEC 60529) IP65
Dimensions (hxwxd) 160 x 160 x 600 mm
160 x 160 x 1000 mm (variants)
Weight Approx. 3 kg / 7 kg (variants)
Material Probe: 1.4404 (AISI 316L)
Housing: Al cast alloy, blue painted

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