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
dust monitor principle is used to measure dust concentration. After the measurement, the exhaust gas goes into the stack again.
DMS-300 manufactured by ZETIAN, one of the best
continuous emission monitoring system suppliers, 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
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Measurement Data
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MeasuringPrinciple
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Laser forward scattering
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MeasuringRange
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0~20mg/m3, 0~50mg/m3 (customizable)
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Detection Lower Limit
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0.05mg/m3
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IndicationError
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±20%
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Indication Error Repeatability
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±10%
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Response Time
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2s (optional)
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Laser Device
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650nm, 20mW
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Measurement Condition
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Sampling Head Diameter
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6mm, 8mm, 10mm, 12mm (customize according to working condition)
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Heat Tracing Temperature
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120℃~180℃
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Medium Temperature
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<300℃
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Ambient Temperature
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-20℃~+50℃
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Compressed Air
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No water and oil,≥0.4MPa, gas consumption 100L/min
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Purging Time
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Purge 3min (concentration data keeps), interval period 4h (adjust according to working condition )
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Velocity Range
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(2~40)m/s
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Preheating Time
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15min
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Input, Output and Interface
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Analog Output
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4-20mA, maximum load 500Ω
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Communication Interface
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Rs485, RS232 (optional)
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General Information
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Weight
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103kg
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Dimension
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1620mm(H)* 850mm(L)* 264mm(D)
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Power
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1500W
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Supply
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220VAC
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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.