WT602 Online Laser Dust Monitor

Industrial Particulate Matter Emission Monitoring System

Product Overview

WT602 is an online laser dust monitor developed for continuous measurement of particulate matter (PM) concentration in industrial stacks, flues, and exhaust ducts.
Based on the laser backscattering principle, WT602 provides stable, real-time dust concentration data for environmental monitoring, emission control, and process optimization.

The instrument adopts single-end installation, does not require optical alignment, and can be directly mounted on chimneys or pipelines. It is widely used in power plants, cement plants, steel works, chemical and petrochemical industries, and can be easily integrated into CEMS, PLC, DCS, or SCADA systems.

Measurement Principle

WT602 uses a 650nm semiconductor laser (7mW) to emit a modulated beam into the flue gas.
When dust particles pass through the laser beam, scattered light is generated. The backscattered light is collected by a photoelectric sensor and converted into electrical signals.

Through DSP digital signal processing, phase-locked amplification, modulation and demodulation, the system accurately calculates the dust concentration and outputs stable real-time values.

This optical structure effectively avoids errors caused by:

• Gas temperature fluctuation

• Mechanical vibration

• Refractive index changes in flue gas

Key Features

• Laser Backscattering Technology – stable and accurate in harsh industrial environments

• Single-End Installation – no optical alignment required

• On-Site Display – real-time dust concentration shown directly

• Strong Anti-Interference – laser modulation & DSP processing

• 4–20mA Analog Output – compatible with PLC / DCS systems

• RS485 Modbus RTU Communication (optional)

• Low Power Consumption – only about 3W

• No-Tool Installation Concept – easy maintenance

• Purge Air Protection – prevents lens contamination

• Offline Zero & Span Calibration with calibration block

Typical Applications

WT602 can be used as a standalone monitor or integrated into a CEMS system. It is suitable for:

• Power plants

• Cement plants

• Steel works

• Chemical & petrochemical plants

• Industrial boilers

• Flue gas emission monitoring

• Dust removal system process control

Installation & Maintenance

• Flange mounting on stack or duct

• Purge air connection (oil-free, water-free compressed air)

• Zero & span calibration recommended every 3–6 months

• Optical window cleaning cycle: 3–6 months

• Designed for 24/7 continuous operation