INFICON Sensistor Sentrac Hydrogen Leak Detector - Manual (Page 38)

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8.2.2 Performing Leak Detection
1 Move the probe tip close to and along the pressurized text object.A small leak can
be more precisely located by moving the probe over the leak again.
2 Remove the probe promptly when a chime sounds. That indicates the detection/
location of a leak.
Notice It is good practice to detect a leak, locate it, and then immediately remove
the probe to avoid saturation. The probe is not damaged by long time
exposure, but it will recover more slowly. After excessive exposure, the
probe will be less sensitive for a short period of time.
Red fixed light together with Reject on the display means the instrument
has detected a leak larger than the set reject level limit.
Large leaks may trigger the probe to react directly when approaching the
test object. If the signal goes off the scale, simply reduce the sensitivity
setting to bring the signal back onto the scale. Using the sensitivity setting
in this way, you will be able to locate multiple leaks that are in close
proximity to each other.