INFICON T-Guard Leak Detection Sensor - Manual (Page 67)

Operation
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Q: Why does the follow-up measurement after a gross leakage return a leakage
rate that is too small?
A: Especially after measuring a gross leak, you should purge the measurement line
for at least 4 s with low-helium air, then wait for 1 s before performing the next
measurement.
This removes the residual helium, which could otherwise affect the following
measurements, from the measurement system.