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What is the technology of powder concentration sensor?

2018-09-06 Source: admin

Friction electrostatic skills: a probe is inserted into the flue gas duct, which can measure the changes in the charge carried by particles and record their existence. Their accuracy and reliability are affected by the following factors: they can only measure the dust that collides, perhaps very close to the probe


Opacity: uses light transmission (more specifically, light absorption) as a technique to measure particle density, using a narrow beam through a flue gas duct to measure light absorption

Light scattering: the light scattering technique uses the frequency and duration of the flash of light reflected by particles in the air stream to measure the content of particles. It has an overwhelming advantage over other skills in that it greatly reduces errors caused by humidity in the air stream to insignificant levels


Light absorption skill: when light wave passes through a linear material, it will interact with the material. Some light waves are absorbed by the medium and converted into heat energy; some are scattered by the medium and deviate from the original transmission direction, The rest of them still pass through the medium according to the original transmission direction. The light intensity and incident light intensity of some pass through the medium according to Lambert Beer law. The light absorption dust concentration sensor is based on Lambert Beer law. After measuring the incident light intensity and the output light intensity, the dust concentration can be obtained through calculation. This method has the characteristics of accurate measurement in the case of high dust concentration


General introduction / principle of charge induction dust content detector: the dust content detector can be simply installed on the dust collector or bag filter without calibration and meet the requirements of "plug and play". The reliable sensor probe is installed at the outlet of the flue gas pipeline of the dust collector. When the dust particles pass by the probe, a weak charge signal is sensed by the probe, The signal is transmitted to the control unit through a special coaxial cable. After being processed by the control unit, the signal outputs a positive output value with a linear share of the particle mass content. The particle content value is displayed locally or an alarm is given, and the output value of 4-20mA is supplied. In the practical application process, in order to prevent the influence of conductive dust, condensate oil mist or water mist on the formation of measurement signal, it is necessary to prevent the influence of conductive dust, condensate oil mist or water mist on the measurement signal, We provide special probe maintenance skills to ensure that the probe can work normally under these harsh conditions. The sensor probe does not need air purge and is wear-resistant and corrosion-resistant

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