INFICON T-Guard Leak Detection Sensor - Manual (Page 51)

Operation
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5.3.3 Continuous Mode
The Continuous mode is only developed for experts in the field of helium leak
detection.
Notice Use the STOP switch or even Standby mode when you do not need a
measurement signal from T-Guard™ Leak Detection Sensor. Standby
mode will further clean up the Wise Technology™ Sensor and enlarge its
lifetime.
In Continuous mode, you are able to get a continuous signal from the Wise Techno-
logy™ Sensor after pressing START. Pressing STOP switches the valves in a way
that the reference line will be measured. G
ROSS and F INE modes can and must be
selected by the user. The T-Guard™ Leak Detection Sensor will not deliver a leak
rate signal in this mode. Therefore, it will not be possible to set trigger values in Conti-
nuous mode.
It is in the duty of the user to interpret the current signal. The sensor current changes
by 1.5 x 10
-7
A per mbar of helium before the sensor.
Fig. 6-12 Recommended set-up for Carrier Gas mode
Item Description Item Description
1 1,000 - 100,000 sccm 6 Air inlet, outside air
2 Dry pump or 7 Test sample
Flow controlled fan 8 Fan
3 Pump exhaust far away from chamber 9 Testing chamber
4 Fore pump exhaust air far away from the 10 Measuring hose connected to
pump outlet
chamber
5 Reference line 11 T-Guard™
Leak Detection Sensor