An airborne particle counter measures particles passing through a defined air sample. Its result depends on the size channels, sample volume, sampling arrangement and instrument condition. Buying a counter with a small minimum channel does not by itself establish a room's cleanliness classification.
Define the measurement before choosing the format
Distinguish spot investigation, scheduled room assessment and continuous process monitoring. A handheld instrument is convenient for moving between locations; a larger portable unit or a fixed sensor can address different sampling and data needs. Choose flow and operating time around the approved sampling plan.
TSI's handheld counter datasheet lists size channels, flow, concentration limits and calibration-related performance separately. These are distinct specifications. A room classification displayed by software is only meaningful when the sampling procedure and configuration are appropriate.
Keep the counting basis visible
Cumulative counts include particles at or above a stated size; differential counts describe particles within a size interval. Check which format is being displayed before comparing reports. Raw counts also differ from concentration normalized to a unit volume.
Record location, sample duration, sampled volume and room operating state with the result. A count collected during maintenance should not silently be compared with an at-rest result as if the conditions were identical. Optical particle counts do not establish whether particles are viable microorganisms.
Control the sampling path
Use the inlet and tubing arrangement specified for the instrument and application. Long or unsuitable tubing can alter the sample reaching the sensor, particularly for larger particles. Keep the inlet position consistent with the measurement objective and avoid obstructing it during handling.
A zero-count check can help identify contamination or a fault in the measurement path, but it does not replace calibration. Maintain the required calibration evidence, sample records and checks after service. Consider data export, location naming and access controls where results support formal quality records.
For airborne particle counters, send shengtongjh the measurement plan, particle sizes, sampling locations and record requirements to compare suitable instrument formats.