How often do the filters of the cleaning table be replaced?

There are two types of purification workbenches: horizontal flow and vertical flow. According to the functions used, they can be divided into desk type and vertical type, single-sided (double-sided) and double-sided (double-sided). It is one of the indispensable basic equipments for biotechnology research and experiment. It is mainly used in medical and health, colleges and universities and other industries for air purification in operating areas.

The air filter is the core equipment and an important component of the air purification system for the purification workbench. The resistance of the filter to air will increase with the increase of dust deposit. When the filter accumulates too much dust and the resistance is too high, the air flow through the filter will decrease, or the filter will be partially penetrated, so when the resistance of the filter increases to a certain extent, the filter will be discarded. Therefore, when using the purification workbench, the filter needs to be replaced regularly to master the appropriate use cycle. If the filter is not damaged, the service life is usually determined by resistance.

In addition to its own advantages and disadvantages, the service life of high-efficiency filters, such as filter materials, filter area, structure design, initial resistance, etc., will also be closely related to the dust concentration in the air, the actual use of air volume and resistance settings and other factors.

In order to grasp the proper use cycle, we must understand the change of resistance of clean worktable. First of all, we must understand the following definitions:

1. Determine the initial resistance: At rated air flow, the initial resistance provided by the filter sample, filter characteristic curve or filter test report.

2. Design Initial Resistance: Filter Resistance (which can be provided by the air conditioning system designer) under the designed air volume.

3. Initial resistance of operation: At the beginning of system operation, if there is no pressure measuring instrument, the resistance of filter can only be taken as the initial resistance of operation under the designed air volume (the actual air volume can not be totally equal to the designed air volume). During the operation of the super-clean worktable, the resistance of the filter should be checked periodically to determine when or how often the filter will be replaced.

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