HANGZHOU ZETIAN TECHNOLOGY CO., LTD

- Model DMS-200 - Probe-in Dust Particulate Matter Monitoring

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DMS-200 dust monitor is a self-developed probe-in monitor, based on years of research on dust detection technology. Different from traditional back scattering dust monitor (such as DMS-100/MS-1000), DMS-200 installs dust measurement module at the top of probe, which directly stretches into the stack for dust measurement in close distance and it adopts laser forward scattering method to realize low detection limit.

DMS-200 adopts laser forward scattering principle to detect dust concentration in measured stack. Detection schematic diagram is in the right.

Modulated laser irradiates on the dust particles in stack and produces scattered light to emit around. The lens collects forward scattered light to converge and then enter high temperature resistant fiber; transfer the optical signal to the detector; signal processing unit will analyze the optical signals. The intensity of scattered light is in direct proportion to the PM concentration. The dust concentration from current stack can be obtained through specific transformation of signals from detector.

  • Measuring principle: Laser forward scattering
  • Measuring range: 0~10mg/m3, 0~200mg/m3 (customizable)
  • Detection lower limit: 0.05mg/m3
  • Indication error: ±20%
  • Indication repeatability: 10%
  • Flue gas temperature: <250℃ (no condensation)
  • Ambient temperature: -40℃~+45℃
  • Purging gas: (0.2~1)MPa, no water, oil or dust, consumption 5L/min
  • Probe length: 1m, 1.5m (customizable)
  • Weight: 15kg
  • COMM interface: Rs485 (default), Rs232 (customizable)
  • Analog output: Isolation 4-20mA output, maximum load 500Ω
  • Supply voltage: 24VDC
  • Power: <5W (when calibrating <15W)
  • Dimension: 185mm* 185mm*1500mm

1. Instrument is installed on stack by flange

2. For convenience of instrument installation, the height of flange installation port shall be higher than that of guard bar

3. Power and gas source are connected at back end of monitor

  • Adopt laser forward scattering method to measure dust concentration; the lower detection limit is as low as 0.05mg/m3
  • Employ gas curtain purging to protect laser and lens of detector end; purging gas is automatically heated by the temperature of stack inside feeler lever and achieve positive pressure dust prevention inside feeler lever
  • High temperature resistance design of probe part
  • Automatic zeroing and calibration of double optical path
  • Support manual range calibration
  • Support automatic range calibration

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