INFICON T-Guard Leak Detection Sensor - Manual (Page 42)

40
Operation
jina
85
e 5
.fm
Tech
ni
ca
l Ha
nd
bo
ok
(1
11
2)
The run-up process takes longer than 3 minutes if the device was turned off for a long
time. Once the T-Guard™ is ready for the measurement, the current measured value
of the leakage rate is displayed on the screen. Otherwise the device is activated with
a warning after 30 minutes at the latest.
The name of the current parameter set is displayed in the top line of the Leak Rate
screen. If the parameter set is changed later, there will be an asterisk before the
name of the parameter set.
Notice If the T-Guard™ Leak Detection Sensor has been switched off for several
days, the initial sensor current may be too high to measure with the highest
sensitivity. In this case, apply external air to the reference inlet and wait for
two hours.
Then, the T-Guard™ Leak Detection Sensor will meet its specification.
Using external air, the unit will display "Background OK".
Changing Contrast
You can change the image contrast of the display during the run-up phase by
pressing Menu
→
Display
→
Contrast.
(The default value is 30)
Fig. 6-2 Estimated remaining time of the run-up period
Fig. 6-3 The T-Guard™ is now ready for measurement.