INFICON T-Guard Leak Detection Sensor - Manual (Page 45)

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5.3 Measuring
Each measurement is started by the START button. A progress bar is displayed
during the measurement. When the measurement has finished, the display shows
the leak rate or an error message. The measurement can be cancelled at any time
by pressing STOP-button. The then displayed leak rate is a provisional value.
5.3.1 Accumulation Mode
When you put a leak test sample filled with helium under pressure in an enclosed
chamber, the helium level in this chamber will rise over time. This is called "accumu-
lation " (of helium). The difference of the helium levels at two different times reflects
the leak rate.
Fig. 6-5 Fine measurement, progress bar
Fig. 6-6 Display of leak rate in Accumulation mode with information on the helium
background of the sensor and the environment.