How do you properly calibrate a sampling pump before air monitoring?

How do you properly calibrate a sampling pump before air monitoring?

• A. Use a stopwatch to time runs.
• B. Use a calibrated flow meter or a primary standard; run a pre-check to set the target flow; document the flow rate; perform a post-check to confirm.
• C. Calibrate after sampling, not before.
• D. Calibration is unnecessary if the pump is new.

Answer: (B)

Calibrating a sampling pump before air monitoring ensures you know exactly how much air is drawn during the sampling period, which is essential for accurate concentration calculations. The reliable way to do this is to connect the pump to a calibrated flow meter or a primary standard. Use that reference to set the target flow, then run a pre-check to verify the actual flow matches the target and document the measured value. Perform a post-check to confirm the flow remained at the target during the sampling. This approach provides traceable, verifiable flow rates and keeps a record for quality control, so the sample volume—and thus the concentration calculations—are trustworthy. Relying on a stopwatch doesn’t measure or verify the actual flow, so it can’t ensure the volume sampled is correct. Calibrating after sampling doesn’t help you know the actual sample volume for that run. And calibration is needed even for a new pump, since production tolerances and potential drift can affect performance.

Calibrating a sampling pump before air monitoring ensures you know exactly how much air is drawn during the sampling period, which is essential for accurate concentration calculations. The reliable way to do this is to connect the pump to a calibrated flow meter or a primary standard. Use that reference to set the target flow, then run a pre-check to verify the actual flow matches the target and document the measured value. Perform a post-check to confirm the flow remained at the target during the sampling. This approach provides traceable, verifiable flow rates and keeps a record for quality control, so the sample volume—and thus the concentration calculations—are trustworthy.

Relying on a stopwatch doesn’t measure or verify the actual flow, so it can’t ensure the volume sampled is correct. Calibrating after sampling doesn’t help you know the actual sample volume for that run. And calibration is needed even for a new pump, since production tolerances and potential drift can affect performance.