Particle Counting
PURPOSE: To measure the particle levels in the cleanroom in order to classify the room.
INSTRUMENTATION: Particle Counter - Calibration documents on equipment used for certification are attached to the report.
PROCEDURES: Divide the Cleanroom work zone into grids of equal proportion and plot the sample locations according to room class and standard used to classify the cleanroom. Place the particle counter probe and take samples perpendicular to the airflow at working height. Record and report data for each considered particle size for the designated classification.
ACCEPTANCE: The average particle concentration at each sample location should fall at or below class limit, and the mean of these averages should fall at or below the class limit. Under certain circumstances a 95% confidence limit is computed.