DM 170 - Backscatter dust measurement

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DM 170 -
Backscatter dust measurement

DM 170 is a backscatter particulate measurement sensor for measuring
dust concentrations

  • is designed to comply with the TÜV suitability testing scheme to EN 15267
  • for measuring dust concentrations in a wide range of industrial applications
  • may be used in combustion applications as well as in higher dust loading applications
  • ideally suited for process opimisation applications
  • ProScatter Backscatter sensor technology with superior minimum detection level as low as 1 mg/m3
  • manual and remote Zero and Span (reference) checks available to ensure optimal instrument performance
  • purge Flow Fail Sensor and Optical Shield options
  • non-intrusive system designed to operate in non-condensing stack environments
  • contamination risks are further reduced due to single-side stack installation where critical optical components remain outside the stack
  • offers a more reliable PM dust measurement as an alternative to opacity and scintillation

What do you want to do?


The DM 170 is well-suited for use in medium to large stacks and is suitable for low to high dust concentration measurements, regardless of dust velocity or charge. Typical applications include:

  • Continuous Emission Monitoring (CEM) relative to Emission Limit Values (ELV) in Power Plant, Boiler and Metal Smelting applications
  • Filter performance monitoring in Metal, Mineral and Chemical plant


The DM 170 is based on PCME’s class-leading ProScatter Backscatter technology.

Particles in the stack are illuminated by a laser and the amount of laser-light scattered back from the particles is measured by a detector. Stray scattering and ambient light are eliminated by tuning the instrument’s field-of-view and by use of a modulated laser source. The instrument response is proportional to dust concentration.
It can be calibrated to provide a mg/m3 measurement by comparison to results of a standard reference (isokinetic) test. With the ability to measure dust levels as low as 1 mg/m3, the DM 170 can be used in applications where emissions are well below the sensitivity limit of traditional Opacity instruments.

Technical Data

Process / Application conditions Application suitability Suitable for measurement in non-condensing flue gases
  Location suitability Outdoor or sheltered use; safe for ambient temperature of -20 to 50 °C
  Flue gas temperatur (at monitoring point) -20 °C to 250 °C
option: up to 400 °C
  Stack pressure ± 20 mbarG
  Stack diameter (application specific) 1.5 - 15 m
  Flue gas composition Non-condensing
  Hazardous zone classification ATEX Zone 2/22
  Stack connection 3" 150 lb ANSI flange
DN80 PN10/PN16 flange
JIS 100-5k, -10k flange
Air pure requirements Requires an externa supply of 1000 l/min of dry, clean (oil-free) air.  
  Type Medium purge blower
  Power supply voltages (options) 110 V AC, 50/60 Hz, 7 A
230 V AC, 50/60 Hz, 2.3 A
  Blower tubing 3 m hose with fittings (supplied)
  Air filter Standard (included)
  Noise pressure level <80 dBA
  Cable entries 1x M20 cable gland
Measurement information Measurement type Light scattering
  Resolution 0.1 mg
  Response time 2 seconds
  Dust levels <1 to 1000 mg/m³
Sensor options Sensor versions Standard sensor up to 250 °C
High temperature sensor up to 400 °C
  Sensor material 316 stainless steel
  Sensor dimensions L 354 x H 216 x B 204 mm (14 x 8.5 x 8 in), including flange and cable glands
  Zero/Span sensor checks Included
  Protection rating IP 65
  Power supply voltage 100 – 240 V AC 50/60, 1 A
24 V DC
  I/O Outputs: 1x 4 ... 20 mA
2x alarm relays
1x RS-485 output
Inputs: 1x digital input
  Manual audit capability Single, compact unit (available in a selected range of dust concentrations)
  Automatic air purge failure check Option

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