INFICON UL1000 Helium leak detector - Manual (Page 41)

Description and Working Principle
41
iina
70
e 0
4
.f
m
te
chn
ica
l ha
nd
boo
k
(1
40
8)
4.2.2.1 LC Display
The LC Display Fig. 4-2 /1 is the communication interface to the operator. It displays
the leak rates, the status report of the machine, messages, warnings and errors.
4.2.2.2 START Button
Pushing the START Button Fig. 4-2 /6 enables the UL1000 and UL1000 Fab to start
the measure procedure. If the START button is pushed again in measurement mode,
the maximum leak rate indicator („hold“ function) is acitvated. This indicator shows
the maximum leak rate since „START“. By pressing the START-button again the
„hold“ function will be started.
4.2.2.3 STOP Button
Pushing the STOP Button Fig. 4-2 /13 interupts the measure procedure. If the button
is pressed longer the inlet is vented according to the conditions defined in the menu
Vent delay . Please refer to chapter 6.6.1.2 Vent delay to select the time parameters
of the venting.
4.2.2.4 ZERO Button
Pushing the ZERO Button Fig. 4-2 /14 enables the zero mode.
When pressing ZERO the currently measured leak rate is taken as a background
signal and is subtracted from all further measurements. As a result the displayed leak
rate then is
To reverse the ZERO function please keep the button pressed for about 3 seconds.
After pressing ZERO the decreasing background is fitted to the course automatically.
So it is possible to recognize leaks even when the signal is decreasing rapidly.
Please also refer to the pictures below.
• 1×10
-6
in GROSS
• 1×10
-10
in FINE
• 1×10
-12
in ULTRA