INFICON Sensistor Sentrac Hydrogen Leak Detector - Manual (Page 40)

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8.2.4 Performing Leak Measurement
1 Move the probe around and over the product, to locate the exact spot where the
leak might be (signal will increase as probe approaches the leak).
2 Move the probe to at least 50 mm (2 in.) from the measurement point.
3 Make sure the instrument indicates 0 cc/s. If not, wait until it does. The output DET
SIGNAL is low when the instrument is not measuring any tracer gas.
4 Move the probe close to or on the leak, at a distance of 0-6 mm (0- 0.24 in.).
5 Hold it there until the measured value stabilizes. This takes approximately 2-4 s.
6 Remove the probe from the measuring point when the measured value stabilizes
and remains on the display.
7 Continue to the next measuring point and repeat the procedure.
Notice The instrument is not an absolute gage, it measures relative to the
background. Therefore, the probe must first be some distance from the
leak and then moved towards the leak for accurate measurement.