Thyracont VSH87E, Operating Instructions Manual

Page: 41 / 48

41
Gas Correction Factor (C1 / C3)
The measurement signal of the VSH depends on type and composition of the gas
being measured. The unit is adjusted for N
2
and dry air. For other gases the pres-
sure display can be corrected below 0.1 mbar by setting correction factors for both
sensor types.
The measurement results of each sensor are then individually multiplied with the
corresponding correction factors by the unit’s microcontroller, thereby providing a
corrected pressure reading as digital output.
Value range: 0.20 ... 8.0
Correction factor C1 Pirani:
Ar
CO CO
2
H
2
He N
2
Ne Kr
1.6 1.0 0.89 0.57 1.0 1.0 1.4 2.4
Correction factor C3 hot cathode:
Ar
CO
2
H
2
He N
2
Ne Kr Xe
0.8 0.74 2.4 5.9 1.0 3.5 0.6 0.41
VSH-EtherCAT-200116