HANGZHOU ZETIAN TECHNOLOGY CO., LTD.
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DMS-300 Dust Monitor

DMS-300 Dust Monitor

DMS-300 Dust Monitor

Overview

DMS-300 dust monitor is a self-developed high-temperature heat tracing extraction dust monitor, based on years of technology research and development for dust detection. Different from conventional in-situ scattering dust monitor, DMS-300 extracts dust from flue (stack) in uniform speed to dust measurement module with full-process high-temperature heat tracing for measurement. It owns features of low detection limit (as low as 0.05mg/m3), no interference by moisture, high measurement accuracy, and etc. It applies to low temperature and high humidity dust conditions of super clean emission and after wet desulphurization.

Principle Of DMS-300 Dust Monitor


Under the negative pressure effect of the jet pump, dust in the stack enters the measurement module after being heated by tracing the sampling probe. Heat tracing will be in the whole process of extraction, measurement, and emission to eliminate moisture interference and prevent dust from blocking the gas path if encountering condensate water. The dust after being heated enters the measurement module, where the laser forward scattering principle is used to measure dust concentration. After the measurement, the exhaust gas goes into the stack again.

DMS-300 employs a magnetic valve and control unit to realize the automatic purging of the gas path and measurement module. Automatic zeroing shall be performed termly.  After maintenance, close laser device and insert calibration module for manual zeroing and calibration. Micro differential pressure transmitter and pitot tube are used to measure gas velocity in stack and feedback to the flow-control device at the same time. It can realize isokinetic sampling and isokinetic flue dust extraction for measurement of pitot tube by changing the jet gas flow to control extraction velocity.

Features Of DMS-300 Dust Monitor


•Adopt the laser forward scattering method to detect dust concentration; low detection limit.
•Full-process heat tracing, which heats water vapor to the gaseous state to prevent dust from caking and blocking gas path when encountering water. Thus it applies to high humidity occasion.
•Pitot tube isokinetic sampling method meets the technical condition of dust sampling
•Support automatic purging to clean  gas path and avoid dust blocking
•Support automatic zeroing technology under high temperature and automatic calibration technology of all optical paths
•Support on-site manual span calibration
•Support automatic double-range switching


Specification Of DMS-300 Dust Monitor


Technical parameter       DMS-300 Extraction Dust monitor

Measurement Data

MeasuringPrinciple

Laser forward scattering

MeasuringRange

0~20mg/m3, 0~50mg/m3 (customizable)

Detection Lower Limit

0.05mg/m3

IndicationError

±20%

Indication Error Repeatability

±10%

Response Time

2s (optional)

Laser Device

650nm, 20mW

Measurement Condition

Sampling Head Diameter

6mm, 8mm, 10mm, 12mm (customize according to working condition)

Heat Tracing Temperature

120℃~180℃

Medium Temperature

<300℃

Ambient Temperature

-20℃~+50℃

Compressed Air

No water and oil,≥0.4MPa, gas consumption 100L/min

Purging Time

Purge 3min (concentration data keeps), interval period 4h (adjust according to working condition )

Velocity Range

(2~40)m/s

Preheating Time

15min

Input, Output and Interface

Analog Output

4-20mA, maximum load 500Ω

Communication Interface

Rs485, RS232 (optional)

General Information

Weight

103kg

Dimension

1620mm(H)* 850mm(L)* 264mm(D)

Power

1500W

Supply

220VAC


Composition Of DMS-300 Dust Monitor



The extraction dust monitor is composed by jet gas control unit (1, 2),  measurement unit (3, 4, 5, 8, 9), control & display unit (7),  and gas path control unit (6,10, 11, 12).   The flue gas inside stack is extracted to measurement unit in constant speed by gas path control unit. Measurement unit is with full-process high temperature tracing to eliminate influence from moisture to dust measurement. Actual concentration signal is processed and displayed by control &display unit. The gas control unit is able to achieve flue gas isokinetic extraction and reflect real dust concentration through velocity measurement inside stack, extraction velocity measurement of gas path, and velocity valve adjustment.The extraction dust monitor is composed of a jet gas control unit (1, 2),  measurement unit (3, 4, 5, 8, 9), control & display unit (7),  and gas path control unit (6,10, 11, 12).   The flue gas inside stack is extracted to the measurement unit at a constant speed by the gas path control unit. Measurement unit is with full-process high temperature tracing to eliminate influence from moisture to dust measurement. The actual concentration signal is processed and displayed by the control &display unit. The gas control unit is able to achieve flue gas isokinetic extraction and reflect real dust concentration through velocity measurement inside the stack, extraction velocity measurement of the gas path, and velocity valve adjustment.
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