Pin Assignment
————————————————————————
below the trigger threshold, i.e. center contact
5 is then connected to contact 6.
8,9,10 Relay for Trigger 2
11,12,13 Relay for Trigger 3
14,15,16 Relay for the signal: ready to measure respec-
tively error (compare with manu item 16)
Note
The pin assignment for contacts 8 to 16 follows the same
order as for pins 5 to 7.
2.6.4 Connection for Accessories
(OPTION)
Contact pins 1 and 3 are fused with an 0.8 A slow-blow
fuse.The amount of power which can be drawn is limited
to 10 W.
The following accessories may be connected here:
- external venting valve
- external partial flow valve
- sniffer probe
Pin Assignment
————————————————————————
1 +24 V, constantly applied, power supply for
the LEYBOLD partial flow valve or
sniffer lines.
2 GND
3 +24 V, switched by the UL 200 for an exter-
nal venting valve
4,5,6
7,8 These pins are used in connection with
accessories.
The contacts are numbered from bottom to top.
2.7 Calibration
The UL 200 may be calibrated in all its operating modes.
A difference is made between internal calibration and
external calibration.
Internal calibration (also see Chapter 2.7.1) is run during
Standby using the optionally built-in calibrated leak for
helium (must be present) an with the inlet valve closed.
External calibration (see also Chapter 2.7.2 and 2.7.3)
requires an additional separate calibrated leak. Under
certain circumstances external calibrations offer the
advantage that these may be performed under conditi-
ons which resemble the conditions during the measu-
rements more closely.
Note
- During initial start-up and before running the fist cali-
bration, the valid mains freqency /see Chapter 2.5 /
menu item 26) should be entered.
- If the UL 200 is connected to a vacuum system, the
calibrated leak must be connected to a point on the
vacuum system which is as far away from the inlet as
possible when running an external calibration. It will
then also be possible to determine the response time.
In the case of systems leak detection, the influences of
the pressure within the test samples and the pressure
conditions in the partial flow mode of operation must be
taken into account. In the case of sniffer leak detection,
the distance between the tip of the sniffer and the test
object and the velocity at which the tip of the sniffer is
moving must be taken into account. Therefore, the
method of external calibration is recommended in the
case of systems leak detection (menu item 2: Mode
P.Flow) and also in the case of sniffing (menu item 2:
Mode Sniff).
A voltage which is supplied by the detection system and
a calibration factor are used by the control computer to
calculate the leak rate. Independent calibration factors
are stored for the sniffer mode and the vacuum mode.
Thus it will not be required to recalibrate when changing
the operating mode (sniffer mode, vacuum mode) provi-
ded both operating modes have been calibrated before-
hand.
2.7.1 Internal Calibration
For leak detection on components a calibration is nor-
mally started using the optionally built-in calibrated leak
by pressing the CAL push-button (see Chapter 2.4.3 -
Description of the CAL push-button). If the no internal
calibrated leak has been built-in, an external calibration
will have to be run. The internal calibration can only be
run while the UL 200 is running in the Standby or Vent
mode.Then the UL 200 will control everything else auto-
matically, this being:
28
TH 10.211/8.02 - 12/97
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