Air Sample Run Time and Volume
Spore-trap run time, total sampled volume, and total pump time from calibrated flow and target volume.
Example
You enter
- Pump flow (L/min, calibrated) 15
- Target volume per cassette (L) 75
- Cassettes in the event (incl. outdoor control) 3
You get
- Run time per cassette 5
- Run time (sec) 300
- Total sampled volume 225 L
- Total pump time (sequential) 15 min
Checked against published worked examples from: ASTM D7391 spore-trap method, cassette manufacturer instructions.
Details, formula, and sources
Formula or tablerun_time_min = target_volume_L / flow_rate_lpm; run_time_sec = run_time_min * 60; total_volume_L = target_volume_L * sample_count; total_time_min = run_time_min * sample_count (sequential on one pump).
Source and editionASTM D7391 (spore-trap method) and the cassette manufacturer's instructions; AIHA-accredited laboratory analysis.
Free accessASTM D7391 licensed; cassette manufacturer instructions free with the product. AIHA lab accreditation directory free at aiha.org.
What governsEstimate. AHJ and licensed professional govern.
API field namesflow_rate_lpm, target_volume_L, sample_count, run_time_min, run_time_sec, total_volume_L, total_time_min
- Spore-trap example values 15 L/min flow, 75 L target volumecommon spore-trap cassette instructions