Gas Correction Factor - thyr cont VD84 Betriebsanleitung

38

5.5 Gas Correction Factor

The pressure reading of your VD84 depends on type and composition of the gas
being measured. The device is adjusted for N
deviation can be neglected below 0.5 mbar. For other gases a correction factor
can be set which produces correct readings below 0.5 mbar. The measurements
of the Pirani sensor are hereby multiplied with the correction factor.
Correction factor Pirani:
Ar 1,6
CO 1,0
To adjust the gas correction factor, switch the unit into Configuration Mode. For
this the instrument must be switched-off. Hold the Mode-Key pressed then, until
the display shows "rAtE".
Then press Mode-Key several times, until the display shows "corr":
MODE
After 5 more seconds the current factor setting is displayed:
5s
MODE
Without further keystroke, the unit switches to Auto-Off Mode after approx. 5
seconds. The last setting of the gas correction factor is saved.
If a correction factor different from 1,00 is
set, symbol "S1" is shown at the lower
boundary of the display!
man_vd84-de-130620
CO 0,89
2
H 0,57
2
The setting range is 0.20 to 8.00.
The value can now be incremented by means
of the Mode-Key. If you hold the key pressed
the value counts up automatically to 8.00 and
then restarts at 0.20.
and dry air, for He and CO the
2
He 1,0
N 1,0
2
Ne 1,4
Kr 2,4
mbar
S1