partial flow valve block in opened (For detailed descripti-
ons please refer to the
operating instructions „GA 10.277“
of the partial flow pump system).
At T
Q
= 0 s valve V 10 will not open for the time being.
This selection is recommended for large volumes or dirty
test objects.
At T
Q
= ∞ (endless) valve V 10 will open when pressing
START. At an inlet pressure p
E
< 3 mbar the UL 200 swit-
ches to measurement mode and displays leak rates.
T
Q
= ∞ is recommended, if it is acceptable to wait for a
while until measurement mode (p
E
< 3 mbar) is reached
and leak rate reading at high inlet pressures are not nee-
ded.
With times T
Q
between 0 and endless V 10 is openend
and the UL 200 tries to reach a inlet pressure of less
than 3 mbar within this time T
Q
. When T
Q
has gone by V
10 is closed and the UL 200 switches to measurement
mode (Helium inlet through the orifice of the partial flow
valve block).
49: Change password 1 ? Change password 1
Access to the extended menu is protected by a pas-
sword. If it is required to change this password you must
first enter the old password according to the description
given in Chapter 2.5.2 and then you must enter the pas-
sword which is to be valid in future.
50: Password 2 locked Permit changes in the
service menu
Through the service menu it is possible to make changes
to the control system of the UL 200 and run test function.
The second password protects the service menus from
being accessed inadvertently. The required password is
only made available after corresponding training.
The second password remains valid (opened) until a
password is entered with is not valid or until the instru-
ment is switched off. After completion of any service
work a password which is not valid should be entered or
the instrument should be switched off.
Note
The second password restricts/enables access only to
any changes which are made in the service menu, i.e.
the user can access the service menu without having to
enter the correct password as long he does not want to
make any parameter changes.
51: 2.4 14000 D970000000 Display software version
number, catalogue num-
ber and serial number
Display software version number, catalogue numbar and
serial number.
In the case of failures or warranty claims, please state
the serial number and the software version number of
the instrument which are displayed here.
TH 10.211/8.02 - 12/97
22
27:Language english
Set language
Choice between German, English, French or Italian lan-
guage.
28: Power Frequency 50 Hz Set mains frequency
Here the frequency of the mains power supply for the
UL 200 must be entered.
The mains frequency has an effect on the effective pum-
ping speed and also on the way in which the leak rates
are calculated.
The mains frequency setting may be set to 50 Hz or
60 Hz.
29:Pumping speed 25 m
3
·h
-1
Entry of the nominal pumping speed of the partial flow
pump (from 4 - 80 m
3
·h
-1
) at the set mains frequency.
30: Cal Leak
6.9E-7 mbar·l·s
-1
Entry of the value of the
calibrated leak (internal)
In this menu item the leak rate of the built-in calibrated
leak, can be read off or also changed.
The display of 0.0 E-07 means that the optional „internal
calibrated leak“ has not been built-in.The entry range for
this calibrated leak spans from 1.0 E-7 to
9.9 E-7 mbar·l·s
-1
.
Note
The leak rate is always entered in mbar·l·s
-1
.
31:Only GROSS off
When selecting the function „Only GROSS on“ the
access to the FINE mode is locked. The leak detector
remains in the GROSS mode with its valid specifications
(Chapter 1.5.1)
Note
If the function „Only GROSS“ is switched on, oil vapours
at low pressures can enter the vacuum lines of the leak
detector and the test object.
32: ZERO-time 1 s Entry of time constant for
sliding zero
There are conditions at which the UL 200 may display
„negativ“ leakrates, because the software substracts
internal and external background signals due to the
Zero- und Autozero-function (please see chapter 2.4.4
and chapter 5). To avoid negative readings the stored
background signals is updated. The ZERO-time adjusta-
ble between 0,5 s and 5 s defines the frequency of upda-
tes.
33: QUICK-Pump time adjustment of sequences in
partial flow mode
The QUICK-Pump time T
Q
is adjustable from 0 s to end-
less. T
Q
defines whether and how long valve V 10 of the
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