D-R 800

Scattered light dust monitor

Certified scattered light dust monitor to detect low to medium concentrations of dust in dry flue gas and process gas.


  • In situ measurement, continuous measurement
  • Suitable for systems with variable gas speed
  • Allows calibration to measure the dust concentration
  • Qualitative dust measurement for monitoring the functions of filters
  • Single sided mounting on the chimney
  • Automatic zero and reference point check
  • Automatic measurement and correction of contamination of optical surfaces
  • Laser light source with long lifetime
  • No moving parts inside of the chimney
  • Nanotech surface protection against early corrosion
  • Easy installation, adjustment and maintenance without a PC
  • Local control panel with LCD display
  • Automatic range switching


Suitable for dust concentration measurement in mg/m3

  • at incineration in general,
  • at installations according 2000/76/EC WID / 17 BImschV
  • at garbage, hazardous waste incinerators,
  • at facilities for cement production
  • at installations according 2001/80/EC LCPD / 13 BImschV / Clean Air Act
  • at power stations with gas, oil, coal or co-firing
  • at installations for the incineration of biomass
  • at facilities pursuant to 27th BImschV

Suitable for monitoring of filter systems

Technical Data

measurementsstray light value, calibrated as dust concentration [mg/m3]
sample gasair, flue gas, non-flammable process gas, dust concentration typically** 0,5 - 10 / 2 - 50 / 5 - 100 / 10 - 200 mg/m3
duct diameter> 0,3 m
sample gas temperature-25 … 350°C, optional up to 500 °C
sample gas pressure-50 to +10 hPa, others on request
sample gas moisture< 95 % relative humidity (non-condensing)
ambient temperature-20 to +50°C, others on request
compliances2000/76/EG WID / 17. BImschV
2001/80/EG LCPD / 13. BImschV
27. BImschV
EN 13284/1 EN 14181
prEN 15267-3
measuring principlemeasurement of light intensity of laser light scattered by dust particles in forward direction
light sourcelaser diode, red 650nm
typein situ, installation at stack, probe in contact with sample gas
system componentsD-R 800 P probe with measuring head
D-R 800 SU purge air unit
measuring range0 - 2.500 SLU-x scattered light units in 4 selectable ranges
expanded uncertainty
EN 13284-2, EN 14181, EN 15267-3
better than 0,7 mg/m3 at
particle size 1-2mü
output rangesfree assignment of SLU values, scaled to mg/m3 concentration to 2 analog outputs.
process connectionflange, 100mm pitch circle, similar to DN 40 PN 6
pipe ID = 70mm
measurement outputs2 x 4-20 mA / 500 Ohm, isolated
1 x RS 485, Modbus RTU
status outputs4 x transistor output, function programmable
status inputs2 inputs, function programmable
analog signal input1 input, function programmable
power supply24 VDC +- 10%
dimensions (h x w x d)60 x 160 x 600 or 1000 mm
immersion depth: 400 or 800 mm
weight7 kg
materialprobe, in contact with sample gas: 1.4404, optionally Hastelloy
measuring head: Al cast alloy, painted RAL 5017
purge air flow rate5 - 10 m3/h
power supply90-264 VAC, 47-63 Hz, 50 VA
status output4 x relay, controlled by D-R 800 P transistor outputs
1 x relay for purge air monitoring*
max. load 48V, 0,5A
dimensions (h x w x d)380 x 300 x 210 mm
weight13 kg
remarks* variants
** the suitability of the D-R 800 for the listed ranges depends on the kind of dust and the size distribution
Subject to technical modifications!

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