Product parameters of pipeline dust concentration detector

Working principle of pipeline dust concentration detector

The dust concentration detector measures the amount of electrostatic charge induced by dust particles passing through a fixed probe. The dust particles induce electrostatic charge with the probe, and the signal is amplified by the probe and transmitted into the monitoring and control system. The magnitude of the electrostatic charge is proportional to the flux of the dust particles. The high-tech electronic circuit of the system converts this part of the charge into a control signal output to start the dust emission alarm, and is used to continuously record the total amount or concentration of dust particles.

The device provides the latest AC coupling technology in the world. This is the most accurate and stable monitoring technology in modern times, especially suitable for continuous emission recording and data accumulation. The working principle of this monitoring system is to use the charge induction generated by dust particles flowing around the probe to confirm the online emission (mg/sec) or emission concentration (mg/m3) of dust particles. In the case of relatively stable combustion conditions (that is, at the same discharge point, the flow rate, temperature, pressure, humidity and soot particle properties have not changed much, less than ± 90% of the change), the system can also be used for online monitoring of emission concentration (unit = mg/M3) after direct calibration.

Application Scenarios

Petroleum and petrochemical, chemical plants, smelters, steel plants, coal plants, thermal power plants, pharmaceutical research, pharmaceutical production workshops, tobacco companies, environmental monitoring, school research, building construction, fire alarm, sewage treatment, industrial gas process control, boiler room, Garbage treatment plant, tunnel construction, oil pipeline, gas filling station, underground gas pipeline maintenance, indoor air quality inspection, safety protection in hazardous places, aerospace, military equipment monitoring, etc.

On-line dust concentration detector interface display introduction

The instrument has a total of 3 buttons, namely "add/cancel", "function/confirm", "move right/down" (hereinafter referred to as "add" ("cancel"), "function" ("confirm"), "move right" ("move left")). The three key positions are as follows. Press the "Function" button.

Internal diagram of online dust concentration detector

Installation and Precautions

The sensor is best installed in the vertical pipe, from the valve, elbow more than 5 times the diameter of the pipe, to be in the horizontal pipe sampling, shall not be installed at the bottom. For the gas dust removal system with multiple boxes running in parallel, a hole shall be opened on the pipeline before entering the net gas main pipe at the outlet of the tested dust removal box (the opening size is φ32mm), and the base interface end of the fixed sensor shall be vertically welded to the top of the horizontal pipeline with a longer straight pipe section.
② The length of the sensor probe, according to the user's need to measure the diameter of the pipe, is selected and supplied by the instrument manufacturer. The base shall be that the top of the insulating sleeve of the sensor probe is level with the inner wall of the pipeline or protrudes out of the inner wall of the pipeline. The base is supplied by the instrument manufacturer.
③ Add copper pad between the sensor and the socket, connect with screw thread and tighten to prevent the leakage of toxic gas in the pipe.
④ The sensor junction box is rainproof. The signal cable is directly connected to the connection terminal in the box through the threading hole on the junction box, and then the sealing rubber ring is compressed. The external cable should be fixed nearby to prevent it from swinging back and forth in wind and rain. Mechanical damage to the transmission wire.

Attention during installation

1. The base and length of the sensor shall be provided by the manufacturer. The opening size of the base in the pipeline shall be φ 32±2mm.
2, the transmission wire please choose 0.75mm2 -- 1.5mm2 ordinary twisted pair (in a particularly strong interference environment, please use a shielded double-core cable, and the shielding layer is well grounded).