INFICON UL1000 Helium leak detector - Manual (Page 30)

30
Installation
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Purge:
Change from low to high: activate purge
Change from high to low: deactivate purge
Clear:
Change from low to high: confirm error message
CAL:
Change from low to high:
When machine is in stand-by mode: start internal calibration. In case machine is
measurement mode: start external calibration. (Premise: external calibration test
leak has to be open and leak rate signal is stable)
Change from high to low:
External calibration: approve that external test leak is closed and leak rate signal is
stable.
High means: U > 13 V(approximately 7mA)
Low means: U < 7 V
The level of the logic signals must not exceed 35V.
Notice: Signals at these inputs are only accepted if the location of control is set to
„PLC“ or „Local and PLC“. Refer to Chapter 6.6.4.1
2.3.2.4 Recorder
The recorder output see Fig. 2-6 /4 may be used to log the leak rate, the inlet pressure
and the forevacuum pressure.
The measured values are provided by way of an analogue signal in the range of 0 V
… 10 V. The resolution is limited to 10 mV. The instrument which is connected to the
recorder output (e. g. X(t) chart recorder) should have an input resistance of no less
than 2.5 k
. The measured values are available through pins 1 and 4. The reference
potential (GND) is available at pins 2 and 3. The contacts are numbered from top to
bottom.
Tipp A diagramm showing pressures and leakrate versus voltage is attached in
the appendix.
Notice: The chart recorder outputs are electrically isolated from other plugs. If, in
spite of this, hum interference is apparent it is recommended to operate the
UL1000 and UL1000 Fab and the chart recorder from the same mains
phase. If this is not possible, you must make sure that the frame ground of
both instruments is kept at the same potential.
Pin Assignment
1 Analog 1
2 GND
3 GND
4 Analog 2