The dust particle counter detects whether the high efficiency filter leaks, mainly to avoid high efficiency air filter leakage and affect the entire production. It is mainly to check whether the suspended particles at each point exceed the requirements of the clean area. If it is, 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 high-efficiency filter is installed or replaced, the filter installation connection must be leaked to ensure that the clean room is clean.
The dust particle counter detects the high-efficiency filter leakage. The main application principle is the light scattering principle. When counting and measuring, the light reflected by the dust particles is received by the photomultiplier tube to determine the size and quantity thereof, and the cumulative and digital display is analyzed. Before the experiment, the temperature is controlled at 18-26 °C; the relative humidity is controlled at 45-65%. No more than 2 indoor testers. For different indoor cleanliness rooms, the static pressure difference is ≥5Pa, and the static pressure difference between the clean area and the non-clean area is ≥10Pa; for the room with large dust production during the process, the relative humidity should be maintained. With these objective conditions, the next step is to take the actual steps:
1. The dust particle counter is disinfected with water for injection and 75% alcohol, and then irradiated to the clean area by ultraviolet light for 30 minutes.
2. Place the dust particle counter horizontally on the table. Measure the plastic tube port and plug it into the connector of the filter.
3. Turn on the power. After the instrument performs the self-test and the option, the measuring plastic tube is removed from the rear panel. The port is placed where it needs to be measured.
4. When the detection head is 2 to 4 cm away from the high-efficiency filter, scan slowly along the inner frame and the middle of the high-efficiency filter. At least 5 points are tested for each high-efficiency filter to observe the display data.
After the test is completed, the sampling plastic tube port is connected to the rear panel of the dust particle counter for self-test. Then turn off the power. The dust filter counter was used to measure the high-efficiency filter results of the 100-level clean zone. From the above measurement, it can be seen whether the high-efficiency filter has a leak. Whether it needs to be plugged or replaced, the filter must be retested after repair or replacement.
The recommended long interval is 24 months. DOP leak detection should be performed after HEPA installation or replacement. When the environmental monitoring shows that the air quality is deteriorated, or when the product sterility test is unqualified and the medium simulation filling test fails, the leak detection can be performed as part of the deviation investigation. The filter that needs to be tested for leak detection also includes the drying tunnel and HEPA used in dry ovens.
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