INFICON SKY CDG025D-X3 0.1 ... 1000 Torr / mbar process gauge - Manual (Page 19)

tina57e1 (2010-01) 19
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
0.1 Torr/mbar ≈1.8 V
If the gauge is operated via a controller, the zero of the
whole measuring system has to be adjusted on the con-
troller: first, adjust the zero of the gauge and then, the
zero of the controller.