INFICON Edge CDG045D2 1 … 1000Torr / mbar - Manual (Page 24)

24 tina86e1 (2013-11)
4.2 Zeroing the Gauge
The gauge is factory calibrated while "standing upright"
(
→ "Calibration Test Report").
We recommend performing a zero adjustment, when the
gauge is operated for the first time.
Due to long time operation or contamination, a zero drift could
occur and zero adjustment may become necessary.
For adjusting the zero, operate the gauge under the same con-
stant ambient conditions and in the same mounting orientation
as normally.
The output signal (measuring signal) is depending on the moun-
ting orientation. The signal difference between the vertical and
horizontal mounting orientation is:
F.S. Δ U / 90°
1000 Torr/mbar ≈2 mV
100 Torr/mbar ≈10 mV
10 Torr/mbar ≈50 mV
1 Torr/mbar ≈300 mV
If the gauge is operated via a controller, the zero of the
whole measuring system has to be adjusted on the
controller: first, adjust the zero of the gauge and then,
the zero of the controller.