H-25C Instruction Manual
Instruction 3015-0216
20
2.2.9 Setting the “GAIN” (Search Mode Sensitivity) Switch
The setting results here are valid only for the search mode I A-type measurement mode.
Raising the sensitivity in order to detect lower values makes it easier to locate leaks.
The sensitivity can be raised in search mode in A-type measurement mode, making it possible to find
leaks with up to ten times (integer factor) the sensitivity of pass/fail mode used to measure leak flows.
However, the sensitivity multiplication factor is restricted by the alarm contact setpoint.
Caution: In search mode, the 20% point on the bar graph is called the search mode trigger
point. Sensor outputs less than the search mode trigger point are assumed to be
background potentials, and are displayed as 0% by the auto-zero function..
This means that in search mode you cannot detect leakage levels lower than the search mode
trigger. Note: this does not apply in special measurement mode. B-type measurement mode is
excluded.
