01Recognize contamination sensitivity
When nitrogen contains very little oxygen, a small contribution from surrounding air can materially affect the result. Connections, seals and pressure conditions along the sample path deserve attention. A high displayed oxygen value is not automatically evidence that the generator output changed.
02Review the sample path
Document the sample point, tubing, fittings, pressure reduction and discharge arrangement. Use components and procedures suitable for the required measurement. Minimize unverified temporary connections and account for the time needed to clear the sample path.
03Compare under controlled conditions
If readings are disputed, use an agreed reference method at a defined location and retain pressure and flow data. Have qualified personnel investigate sample integrity. Do not modify protective gas controls merely because one portable instrument produces a different initial reading.
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