12.0 cleanroom cleanliness - dust particle number measurement

Clean room cleanliness - Measurement of dust particle number {selection of dust particle counter} simple clj-3016h hand-held laser particle counter is limited to volume and weight The sampling flow of the hand-held laser particle counter is generally 0.1 cubic feet (0.1 CFM) per minute, i.e 2.83 liters (2.83 L / M) per minute, and its Zui small particle size channel is generally 0.3 μ M Generally, it can work with battery or alternating current The particle size channel of this kind of products can be divided into two channels Because of the small amount of air sampled by this kind of products, the measurement accuracy is relatively low, but it is flexible with the movement of the detection personnel, and it is suitable for the monitoring of various clean rooms to determine the efficiency and tightness of the filtering equipment This kind of products can store a certain amount of sampling data, with download software, without printing device The portable laser particle counter is more complex than the hand-held mechanism, with higher measurement accuracy, so its volume and weight are also large It is generally used for the certification test of clean room, usually with small flow rate and large flow rate, but it is multi-channel, and it can be selected according to the different levels of the tested clean room Most of these products are built-in printers, and some of them are printed after data storage Laser particle counter and related equipment for real-time monitoring of clean environment In order to know and judge whether the clean room environment, especially the status of some key areas or parts, is still and always in line with the technical indicators specified by the production or scientific research institute during the operation of the clean room, the clean room manager needs to conduct real-time monitoring or periodic monitoring of its main technical indicators For this purpose, some clean rooms have set up continuous patrol devices for some key indicators: cleanliness, temperature, humidity and inert gas, so as to check the controlled state of the clean room at any time Features of remote air particle counter: large flow rate of 1.0cfm (28.3l / min) and 0.1cfm (2.83l / min), small monitoring of 0.2 μ m particles by Zui, general performance of series of remote air particle counter on two standard particle size channels Market: ◆ monitoring particle size of 0.2 μ M-10 μ m (optional channels in this range) ◆ it can be integrated into FMS system (manufacturing system under centralized control and management of computer) ◆ it is easy to maintain and verify data output Ethernet and analog communication mode ◆ it has built-in flow sensor, which can give early alarm in case of flow deviation In the other kind of sequential monitoring system, the air sampling ports are only set in the key parts of the clean room, and the multiple sampling ports are connected with the sequential monitoring system equipped with laser particle counter and computer through aerosol conduit The order of laser particle counter controlled by computer is connected with the aerosol duct of each sampling port The air at the sampling port connected with the laser particle counter is collected by air pump to measure the particle size and quantity, and the results are recorded in the computer.