D-R 808

Dust monitor

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.


  • Single-sided installation without optical alignment
  • Automatic zero and reference point check
  • Automatic contamination check and correction
  • Integrated purge air monitoring
  • QAL1 certified according to EN 15267-3
  • Compliant with US EPA 40 CFR 60 PS11
  • Lowest certification range 0 ... 7.5 mg/m3

Your benefit

  • Certified for official emission monitoring
    Type approved according to EN 15267-3, compliant with the requirements of US EPA 40 CFR 60 PS11
  • 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




Continuous emission monitoring, e.g. 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 

Technical Data

Flue gas typeAir, flue gas, non flammable process gas
Flue gas temperatureAbove dew point up to +350 °C
optional up to 500 °C with additional components
Inner duct pressure-50 ... +50 hPa
Flue gas relative humidity0 ... 95% rel. humidity, non-condensing
Inner duct diameter> 0.3 m
Measuring principleForward scattering
IED 2010/75/EU
US-EPA 40 CFR 60 PS-11
CertificatesCE, QAL1 EN 14181:2015 / EN 15267-1:2009 / EN 15267-2:2009 / EN 15267-3:2008, MCERTS pending
Measuring locationIn situ, probe in contact with flue gas, one-sided installation at the stack, no optical alignment
Measuring sequenceContinuous
System componentsD-R 808 M measuring device
D-TB 200 terminal box incl. purge air supply
D-ISC 100 universal operating unit (option)
Self-check, protective functionsAutomatic 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 valueScattered light units
Derived measuring valuesDust concentration in mg/m3 after gravimetric calibration
Normalized dust concentration in mg/Nm3 after gravimetric calibration
Measuring range dust concentrationmin. 0 …5 mg/m³
max. 0 …200 mg/m³
Output range dust concentrationOutput range freely programmable. Any range can be assigned to an analogue output.
Certified measuring rangeDust concentration
0 ... 7.5 mg/m³
Integration time1 ... 180 s, programmable
Light sourceLaser diode, 650 nm
Process connectionFlange, pitch circle 100 mm, DN70 PN6
Digital interfacesRS 485 Modbus RTU, bi-directional communication, USB (Service)
further with D-ISC 100
Analogue outputs1x 4-20mA, 400 Ohm, isolated, assignment parameterisable
further with D-ISC 100
Digital outputs2 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 supply24 VDC, 0.5 A
OperationD-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)
WeightApprox. 3 kg / 7 kg (variants)
MaterialProbe: 1.4404 (AISI 316L)
Housing: Al cast alloy, blue painted
Power supply90 ... 264 VAC, 48 ... 62 Hz
Air supply capacityStage 1: max. 15.5 m3/h
Stage 2: max. 31 m3/h
IP protection class (IEC 60529)IP65
Dimensions (HxWxD)410 x 400 x 200 mm
WeightApprox. 10 kg
MaterialStainless steel 1.4301 (AISI 304)

The universal operating unit D-ISC 100 allows the connection of several DURAG devices. It allows parameterization and maintenance of all connected devices via the integrated keypad or a connected PC and also supports remote access via intranet or internet connection.

 Opens internal link in new windowD-ISC 100

  • The suitability of the D-R 808 for the listed ranges depends on the kind of dust, the size distribution and to a certain extend on the duct diameter.
  • Subject to technical modifications.


Universal display and operating units

The universal operating unit  Opens internal link in new windowD-ISC 100 allows the connection of several DURAG devices. It allows parameterisation and maintenance of all connected devices via integrated keypad or a connected PC and also supports remote access via intranet or internet connection.


Our  Opens internal link in new windowD-ESI Service and Parameterisation Software  assists you to manage all your DURAG sensors connected in one network system via a uniform graphical Interface.


Please contact your sales representitive for more Information.

Supply unit

  • Opens internal link in new window D-TB x00 in various versions
  • for voltage supply of one DURAG sensor
  • different housings available
  • version with integrated purge air blower available

Please contact your sales representitive for more information.

Purge air blower

  • D-BL xx in various versions
  • for supplying the measuring head with purge air
  • weather protection cover available as an option

Please contact your sales representitive for more information.

We offer various accessories such as weather protection covers for your sensor, reference filter sets, mounting flanges and so on to fit your application and to have all components from one source.

Please contact your sales representative for further information.