The normal working pressure difference range of the air shower transfer window pressure difference gauge is mainly determined based on the initial pressure difference of the high-efficiency filter. The general reference standards and details are as follows:
The initial pressure difference reference is the pressure difference when the air shower system is stably operating after the installation of the new high-efficiency filter. The conventional range is 5 to 15Pa (the specific value is subject to the equipment manual or the technical parameters of the high-efficiency filter).
During normal operation, the reading of the differential pressure gauge should be maintained within the range of 1 to 2 times the initial differential pressure. For example, if the initial pressure difference is 10Pa, then the normal working pressure difference range is 10 to 20Pa.
Regardless of the initial pressure difference, when the reading of the differential pressure gauge exceeds 25Pa or reaches twice the initial pressure difference, it is determined to be abnormal and the high-efficiency filter needs to be replaced in a timely manner.
Key points to note
This range is only for the resistance monitoring of high-efficiency filters. There is no separate chamber pressure difference requirement for the air shower transfer window (its cleanliness is achieved through the air shower airflow, rather than the pressure difference between the chamber and the clean area).
The differential pressure reading should be taken when the air shower system is operating stably and both door bodies are completely closed. Readings taken when the door is not tightly closed or the fan has just started are invalid.
The resistance of high-efficiency filters of different brands and models varies. Ultimately, the parameters provided by the equipment manufacturer should be taken as the standard.