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Pre-filter installation precautions

2019-10-29  762

1. Before installing all kinds of pre-filters, do not open the packaging bag or packaging film; and store the filter in the direction marked on the packaging box; during handling, it should be handled gently and gently to avoid violent vibration and collision. .

2. In the process of transportation, installation and use, it should be carried out according to the requirements to ensure the use effect. After using a variety of filters for a period of time, dust is trapped on the surface of the filter material, which reduces the efficiency and resistance of the filter, which affects the cleanliness of the air supply. In this case, the filter needs to be replaced in time.

3. For high-efficiency filters that need to be used in high humidity and high temperature environments, filter papers with high temperature and high humidity resistance, partition plates and frame materials must be selected to meet the production requirements. The biological clean room and the medical clean room must use the filter of the metal frame, and the surface should be not easy to rust. It is not allowed to use the filter of the wooden frame plate to prevent bacteria and affect the qualified rate of the product.

Prefilter

For the above filter, if there is a differential pressure gauge or a differential pressure sensor before and after the filter, the coarse filter must be replaced when the pressure difference is greater than 250Pa; for the medium efficiency filter, the pressure difference is greater than 330Pa. Must be replaced; for sub-high efficiency filters, when the pressure difference is greater than 400Pa, it must be replaced, and the original filter can not be reused; for high-efficiency filters, when the resistance value of the filter is greater than 450Pa; or when Wind flow speed is reduced to a minimum, even after replacing the coarse and medium efficiency filter, the air flow speed can not be increased; or when the high-efficiency filter surface has unrepairable leakage, a new high-efficiency filter must be replaced; If there is no such condition, it can be replaced once every 1-2 years depending on the environmental conditions.

In order to give full play to the role of the filter, the upstream wind speed of the filter during the selection and use, the coarse and medium efficiency filter should not exceed 2.5m/s, and the sub-high efficiency filter and high efficiency filter should not exceed 1.5m/ s, this will not only help to ensure the efficiency of the filter, but also extend the life of the filter and save costs. When the equipment is running, it is generally not necessary to replace the filter; if the filter has not been replaced due to the replacement period, only the coarse and medium efficiency filters can be replaced in the case of non-stop fans; the sub-high efficiency filter and the high efficiency filter must be replaced. After the air supply is stopped, it can be replaced; the gasket between the filter and the connecting frame must be tight and leak-free to ensure the filtering effect.