The clean room has strict regulations on the humidity, temperature, fresh air volume, condition, illumination, etc. of the environment, ensuring the production quality of products and the comfort of personnel working environment. The entire clean room system is equipped with an air purification system that uses a three-level filter with primary, medium, and high-efficiency filters to control the number of dust particles, settling bacteria, and planktonic bacteria in the clean area. As an end filtration device, the high-efficiency filter determines the operational efficiency of the entire purification system. Therefore, it is very important to grasp the replacement time of the high-efficiency filter.

关于过滤器更换标准整理如下几点：

The standards for replacing high-efficiency filters are summarized as follows:

,我们从过滤器说起,在洁净无尘室中,无论是安装在净化空调机组未端的大风量空气过滤器还是安装在送风口的空气过滤器,这些必需要有准确性的运行时间记录和洁净度及风量作为更换依据,如在常态的使用情况下,过滤器的使用寿命可以长达一年以上,如前端保护做的好过滤器的使用寿命可以长达二年以上一点问题也没有,当然这也要视空气过滤器的质量好坏而定,或许更长;

Firstly, let's start with high-efficiency filters. In a clean and dust-free room, whether it is a large air volume high-efficiency air filter installed at the end of a purification air conditioning unit or a high-efficiency air filter installed at the high-efficiency air supply outlet, accurate operating time records and cleanliness and air volume as replacement criteria are necessary. For example, under normal use, the service life of high-efficiency filters can reach over one year, If the front-end protection is well done, the service life of the high-efficiency filter can reach more than two years without any problems. Of course, this also depends on the quality of the high-efficiency air filter, perhaps even longer;

第二,如安装在净化设备中的过滤器,如风淋室里的过滤器,如前端初效过滤器保护做的好过滤器的使用寿命可以长达二年以上;如净化工作台上的过滤器,我们可以通过净化工作台上的压差表的提示来更换过滤器,洁净棚上的过滤器可通过空气过滤器的检测风速来决定空气过滤器更换的时间，如是FFU风机过滤单元机组上的空气过滤器更换更是通过PLC控制系统中的提示或者压差表的提示来更换空气过滤器。

Secondly, if the high-efficiency filter installed in the purification equipment, such as the high-efficiency filter in the air shower room, is well protected by the front-end primary filter, the service life of the high-efficiency filter can reach more than two years; For example, the high-efficiency filter on the purification workbench can be replaced by the pressure difference gauge on the purification workbench. The high-efficiency filter on the clean shed can determine the optimal time for replacing the air filter by detecting the wind speed of the high-efficiency air filter, If the high-efficiency air filter on the FFU fan filtration unit is replaced, it is replaced through the prompts in the PLC control system or the pressure difference gauge.

第三、我们一些有经验的空气过滤器安装人员总结了宝贵的经验，在这里给大家介绍一下，希望可以帮您在把握空气过滤器更换的时间上更加准确，在空调机组中当压差表展现，空气过滤器阻力抵达初阻力的2～3倍时，应中止维护或改换空气过滤器。

Thirdly, some experienced air filter installers have summarized valuable experience and introduced it here. We hope it can help you more accurately grasp the optimal time for air filter replacement. When the pressure difference gauge shows that the resistance of the air filter reaches 2-3 times the initial resistance in the air conditioning unit, maintenance should be stopped or the air filter should be replaced.

在没有压差表的状况下，可依据以下简双体式格局来抉择能否需求改换：

In the absence of a differential pressure gauge, the following simplified binary pattern can be used to determine whether a replacement is needed:

1)察看空气过滤器上下风侧滤料的颜色，如出风面滤料颜色劈头变黑就要预备改换;

1) Check the color of the filter material on the upper and lower air sides of the air filter. If the color of the filter material on the outlet side turns black, prepare to change it;

2)用手触摸空气过滤器出风面滤料，如手上有比较多的尘土则要预备改换;

2) Touch the filter material on the air outlet surface of the air filter with your hand, and if there is a lot of dust on your hand, prepare to replace it;

3)多次记录空气空气过滤器的改换状况，总结出改换周期;

3) Record the replacement status of air filters multiple times and summarize the optimal replacement cycle;

4)在空气过滤器未抵达终阻力的前提下，呈现洁净室与相邻房间压差明显下降，则有可能是初中效过滤阻力太大，要预备改换;

4) If the pressure difference between the clean room and adjacent rooms decreases significantly without reaching the final resistance of the high-efficiency air filter, it is possible that the resistance of the secondary efficiency filter is too high and it needs to be prepared for replacement;

5)洁净室内呈现洁净度达不到设计请求，或呈现负压，在初中效空气过滤器没有抵达改换时候时，则有可能是空气过滤器阻力太大，要预备改换。

5) If the cleanliness of the clean room does not meet the design requirements or presents negative pressure, and the high efficiency air filter has not reached the time of replacement, it is possible that the resistance of the high efficiency air filter is too high and it needs to be prepared for replacement.

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