Metrolab Blog

Particle Counters keep in mind 6

𝗖𝗹𝗲𝗮𝗻𝗿𝗼𝗼𝗺 𝗣𝗮𝗿𝘁𝗶𝗰𝗹𝗲 𝗦𝗮𝗺𝗽𝗹𝗶𝗻𝗴 𝗣𝗿𝗼𝗰𝗲𝗱𝘂𝗿𝗲
(𝗜𝗦𝗢 𝟭𝟰𝟲𝟰𝟰-𝟭:𝟮𝟬𝟭𝟱 𝗔𝗻𝗻𝗲𝘅 𝗔𝟱)

☑Set up the particle counter including zero count check

☑The sampling probe shall be positioned pointing into the airflow

☑If the direction of the airflow is not controlled or predictable, the sampling probe shall be directed vertically upward

☑Ensure normal conditions for the selected occupancy state are established (𝘶𝘴𝘦 𝘱𝘢𝘳𝘵𝘪𝘤𝘭𝘦 𝘤𝘰𝘶𝘯𝘵𝘦𝘳𝘴 𝘥𝘦𝘭𝘢𝘺 𝘵𝘪𝘮𝘦𝘳 𝘧𝘶𝘯𝘤𝘵𝘪𝘰𝘯 𝘵𝘰 𝘭𝘦𝘢𝘷𝘦 𝘵𝘩𝘦 𝘤𝘭𝘦𝘢𝘯𝘳𝘰𝘰𝘮 𝘣𝘦𝘧𝘰𝘳𝘦 𝘴𝘵𝘢𝘳𝘵 𝘢𝘯𝘥 𝘦𝘴𝘵𝘢𝘣𝘭𝘪𝘴𝘩 «𝘢𝘵-𝘳𝘦𝘴𝘵» 𝘤𝘰𝘯𝘥𝘪𝘵𝘪𝘰𝘯𝘴)

☑Sample the volume of air determined as per single sample volume «Vs»

☑If an out-of-specification count is found at a location due to an identified abnormal occurrence, then that count can be discarded and noted as such on the test report and a new sample taken

☑If an out-of-specification count found at a location is attributed to a technical failure of the cleanroom or equipment, then the cause should be identified, remedial action taken and retesting performed of the failed sampling location

Cleanroom Particle Sampling Procedure