Filter paper with fluff, broken phenomenon, resulting in a small air leakage, it will seriously affect the filter efficiency of filtration and air quality, to the production workshop, clean bench, clean room has brought unnecessary trouble and burden, so that the entire production Processes are hampered.
The air flow rate is expressed by “m / s”, and the air flow is expressed by “m / h3”. The unit of resistance, initial resistance and end resistance is expressed by “Pa”. The filtration efficiency is expressed by “% MPPS” Micron um as a unit.
Air duct system fan air volume is generally measured by the maximum filter airflow 1.3 times the calculation; duct resistance is generally calculated according to 1.2 times the resistance calculation, inlet air filter resistance is calculated according to the initial resistance of 2 times; The rated air volume and wind speed of the tested filter […]
Clean room temperature and relative humidity should be compatible with the production process requirements. The temperature is controlled between 18 ° C and 24 ° C. The relative humidity of 45% ~%; pressure is generally relatively positive pressure, cleanliness of the air between the different clean room pressure should be ≤ 4.9Pa
At the rated air volume, two dust particle counters are commonly used to measure the particle diameter of the air in the upper and lower air of the test filter is greater than or equal to 0.5um, greater than or equal to 1.0um, greater than or equal to 3.0um, greater than or equal to 5um […]
Labels: Each filter must be marked in a prominent position, if necessary, should also indicate the direction of air flow, marked at least the product name, filter model specifications, the rated air flow efficiency and the initial resistance, the factory name and product factory date. Packaging: packaging should ensure that the factory inspection of qualified […]
For the extraction of a sample, the inspection items in the main item has one or other items are two failed, then the sample is unqualified; In the sampling of a test failed, then double extraction, such as there is still a failure, the batch of filters for the non-conforming products; If more than 3 […]
The dimensions of the air filter are expressed by the principle that the vertical length is the height and the horizontal length is the width when the airflow passing direction is the depth and the vertical surface of the airflow passing direction is correctly installed.
Refers to the volume or mass of suspended particulates in the air per unit volume. When the unit of “grain / liter”, said the count concentration: When the unit in mg / m3 said, called the weight concentration. In the clean room sampling, the sampling location should be 0.8m from the ground level of the […]