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• Time of issue:2022-03-26 15:34
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(Summary description)Use a dust particle counter to detect whether the filter is leaking to avoid air filter leakage and affect the entire production. The dust particle counter mainly detects whether the suspended particles at each point exceed the required range of the clean area. If so, there is a leakage phenomenon, which needs to be plugged or replaced. This is also a relatively simple and accurate method of operation. After the filter is installed or replaced, the installation and connection of the filter must be checked for leaks to ensure that the cleanliness of the clean room meets the requirements.
 
After the particles of different particle sizes are converted by the photoelectric system of the laser dust particle counter, electrical pulse signals of different amplitudes (voltages) will be generated. The larger the particle size, the higher the pulse voltage. The relationship between signal voltage and particle size is also called conversion sensitivity. For a given laser dust particle counter, the particle size and pulse voltage correspond one by one. For example, the conversion sensitivity of a laser dust particle counter is 0.3μm corresponds to 69mv, 0.5μm corresponds to 531mv, 1.0μm corresponds to 701mv, etc. If the particle counter detects a pulse of 100mv, the particle size must be greater than 0.3μm and less than 0.5μm. The laser dust particle counter is an instrument that measures the number of particles greater than or equal to a certain particle size, and its internal circuit is a circuit that counts the number of pulses greater than or equal to a certain voltage value. For the example in the previous paragraph, to measure the number of particles greater than or equal to 0.3μm in the air, in the circuit is to count the number of pulses greater than or equal to 69mv, and to measure the number of particles greater than or equal to 0.5μm, in the circuit is to count the number of pulses greater than or equal to 0.5μm is the number of pulses of 531mv, and so on. Therefore, the measurement of dust particles by the dust particle counter mainly depends on the parameter of conversion sensitivity.