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In the clean room, we need to use instruments to measure the number and particle size distribution of dust particles in the air, which can provide a basis for the evaluation of air cleanliness, and the laser dust particle counter is used to measure the number and size of dust particles in the air.
Particle size distribution instrument
.
The laser dust particle counter is an instrument used to measure the number and particle size distribution of dust particles per unit volume in a clean environment, thereby providing a basis for the evaluation of air cleanliness
.
The common laser dust particle counter is the light scattering type (DAPC), which measures the particle size range of 0.
1-10 μm, in addition to the condensed core type laser dust particle counter (CNC), which can measure the dust particles of smaller size
.
Particles with different particle sizes will generate electrical pulse signals of different amplitudes (voltages) after being converted by the photoelectric system of the laser dust particle counter.
The larger the particle size, the higher the pulse voltage
.
The results measured by different personnel may be biased.
In order to meet the production conditions, the company builds a dust-free workshop.
How to measure the concentration of dust particles in it? After summarizing, mainly pay attention to the following aspects: 1.
Test at a test point! 2.
A maximum of two people are allowed at a test point to prevent the stability of the test data from being affected by the personnel! 3.
You can choose to use the average mode of the laser dust particle counter to test three times at a test point to get the average value, which will make the test data more stable and accurate! 4.
Testers must wear clean clothes, clean caps, etc.
in accordance with the regulations to avoid the influence of external factors; during the test, people should avoid walking, talking, shaking clothes, etc.
, which will affect the air flow near the test point and affect the stability of the test data; Avoid the high-efficiency air supply vents, because the air in the return air vents is relatively clean, so it will affect the accuracy of the test data; avoid the humidifier, which will increase the air humidity near the test point, and when the humidity exceeds the level of the laser dust particle counter At times, it was caused to fail to test normally; 5 or 5 decimeters means that the distance between the tester and the particle counter is 50 cm away!
Particle size distribution instrument
.
The laser dust particle counter is an instrument used to measure the number and particle size distribution of dust particles per unit volume in a clean environment, thereby providing a basis for the evaluation of air cleanliness
.
The common laser dust particle counter is the light scattering type (DAPC), which measures the particle size range of 0.
1-10 μm, in addition to the condensed core type laser dust particle counter (CNC), which can measure the dust particles of smaller size
.
Particles with different particle sizes will generate electrical pulse signals of different amplitudes (voltages) after being converted by the photoelectric system of the laser dust particle counter.
The larger the particle size, the higher the pulse voltage
.
The results measured by different personnel may be biased.
In order to meet the production conditions, the company builds a dust-free workshop.
How to measure the concentration of dust particles in it? After summarizing, mainly pay attention to the following aspects: 1.
Test at a test point! 2.
A maximum of two people are allowed at a test point to prevent the stability of the test data from being affected by the personnel! 3.
You can choose to use the average mode of the laser dust particle counter to test three times at a test point to get the average value, which will make the test data more stable and accurate! 4.
Testers must wear clean clothes, clean caps, etc.
in accordance with the regulations to avoid the influence of external factors; during the test, people should avoid walking, talking, shaking clothes, etc.
, which will affect the air flow near the test point and affect the stability of the test data; Avoid the high-efficiency air supply vents, because the air in the return air vents is relatively clean, so it will affect the accuracy of the test data; avoid the humidifier, which will increase the air humidity near the test point, and when the humidity exceeds the level of the laser dust particle counter At times, it was caused to fail to test normally; 5 or 5 decimeters means that the distance between the tester and the particle counter is 50 cm away!
