Tankerman · Safety — Oxygen Analyzer Calibration
Before using a fixed or portable oxygen analyzer to verify a tank atmosphere, the user must:
- ASubmerge it in cargo first
- BAssume it is accurate without any check
- CCalibrate/zero and span it (e.g., in fresh air to 20.9%) per the manufacturer's procedure✓ Correct
- DUse it only after entry
Explanation
Atmosphere testing is only as reliable as the instrument. The analyzer must be calibrated/zeroed and span-checked (commonly against fresh air at 20.9% O2, and with a known span gas) before use, kept in date for calibration, and the sample drawn from representative points throughout the space.
Authority: ISGOTT; enclosed-space entry procedures
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