Parameters
GA 09.035/6.02 - 07/2011 - © Oerlikon Leybold Vacuum
41
Ctr
For CTR transmitters. The response of the Multi-Channel Controller to signal
changes depends on the measuring range. The display is especially stable in
the low measuring range.
Tab. 5-4
Measurement with filter set to
Ctr
5.2.2
Gas type (
GAS
)
Transmitters are normally calibrated for a measurement in nitrogen or in air.
The
GAS
parameter is used to configure the channel to other gas types.
Tab. 5-5
GAS
parameter settings
Cor
If you want to perform pressure measurements in a gas type without a fixed
correction factor, you may multiply the pressure reading with a variable correc-
tion factor. To this end proceed as follows:
1
Set the
GAS
parameter to
Cor
2
Press the PARA button
The correction factor is displayed
3
Use the arrow buttons the modify the correction factor
The value of the parameter is changed
The COR indicator is illuminated
You can adjust the correction factor of a transmitter in the range
0.10
…
9.99
.
The setting
1.00
returns the uncorrected pressure reading.
Note:
For transmitters of type ITR und PTR 90, the gas type correction is effec-
tive only for p < 10
-2
mbar; in case of TTR100 and TTR 101 only for p < 10
mbar.
Measuring range
Filter
0.1 … 1 FS
nor
(normal)
0.04 … 0.1 FS
SLo
(slow)
0.01 … 0.04 FS
Approx. 2
×
SLo
0 … 0.01 FS
Approx. 4
×
SLo
Display
Significance
n2
Nitrogen or air. No correction of any kind is required.
Ar
Argon. The pressure reading is determined utilizing a
correction factor for argon. COR is illuminated.
H2
Hydrogen. The pressure reading is determined utilizing
a correction factor for hydrogen. COR is illuminated.
Cor
Other gases. The pressure reading is determined utiliz-
ing a variable correction factor. COR is illuminated.
