Enter the measurement mode by operating the START
push-button, for example.
When the green light emitting diode on the hand unit
(5/3) is on continuously, or when the LCD display (4/2)
indicates a measured value, then press the CAL push-
button (4/9).
The running process may be terminated by pressing the
CLEAR push-button (4/10) or by pressing the CAL push-
button (4/9) once more. After it has been started, the
LCD display (4/2) will indicate messages which inform
the operator about the process and ask him to run furt-
her operations as above.
For calibration of the helium leak rate, a sniffer calibrated
leak (e.g. Cat. No. 155 88, TL 4-6) is required. However,
also a sample of a leaky component which is filled with
helium where the leak rate is known may be used as a
reference leak. After having entered the nominal leak
rate and after having unscrewed the blocking valve on
the leak (the opening of the leak is directly accessible)
proceed in the same way as described in Chapter 2.7.2
„External Calibration“ but with the following exceptions:
- When the message „Open Test Leak < enter>“ is dis-
played, the tip of the sniffer must be held as closely as
possible in front of the external leak instead of opening
it.
- When the message „Close Cal-Leak <enter>“ is dis-
played, the tip of the sniffer must be held in uncontami-
nated ambient air, i.e. no helium may be sprayed aro-
und in the vicinity.
2.8 Shutdown
To shut down the UL 200, set the mains ON / OFF mains
switch (2/7) to the „0“ position regardless of the operating
mode the UL 200 is currently running. Nothing else is
required. When switching off the instrument it is vented
as is the test sample too.
Note
If venting of the test sample or the system is to be pre-
vented when switching the instrument off you should
select in menu item 23: System integration „ON“ before
doing so.
The operating mode of the UL 200 and all other para-
meters are saved. After switching the instrument on
again it will resume operation in the same mode.
30
TH 10.211/8.02 - 12/97
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