Metrolab Blog

Particle Counters keep in mind 11

𝗖𝗹𝗲𝗮𝗻𝗿𝗼𝗼𝗺 𝗖𝗹𝗮𝘀𝘀𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻: 𝗩𝘀 «𝗠𝗶𝗻𝗶𝗺𝘂𝗺 𝗦𝗮𝗺𝗽𝗹𝗲 𝗗𝘂𝗿𝗮𝘁𝗶𝗼𝗻 »
Table showing minimum duration (minutes) if you are using 1 CFM (28.3LPM) Particle Counters.

🔠According to ISO 14644-1:2015;

☑ If concentrations are leading to large air sample volumes for classification, a sequential sampling procedure may be applied. You can find it in Annex D.

☑ The volume sampled at each location shall be at least 2 liters, with a minimum sampling time of 1min for each sample at each location. Don’t worry about 2 liters since the commercially available minimum flow rate particle counters are 0.1CFM (2.83 Liter per minute; LPM )which will give you more than 2 liters in a minute in any case.

Cleanroom Classification : Vs «Minimum Sample Duration » Table showing minimum duration (minutes) if you are using 1 CFM