Model 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

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.

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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