Siemens SIPROCESS GA700 Operating Instructions

Checking pressure switch for function
1. Increase the reference gas pressure until the pressure switch is triggered, meaning that the
switch contact opens.
2. Please ensure that the reference gas pressure is not more than 2 000 hPa above the sample
gas pressure.
The value when pressure is increasing (response pressure) is always higher than the value
when pressure is decreasing (release pressure). This so-called switching hysteresis of the
pressure switch is approx.200hPa.
9.5 Zero point error
Note
Zero point error because of surrounding gases
Keep the ambient air of the analyzer section free from the measured gas component; otherwise,
measurement results will be a󹪜ected. Gases which exhibit cross-sensitivity to the measured gas
component must also not be present in the ambient air.
9.5.1 OXYMAT 7
Accompanying gases (interfering gases) cause a zero point deviation that is positive with
paramagnetic gases and negative with diamagnetic gases. The extent of this o󹪜set per 100 vol.
% accompanying gas, expressed in vol. % O
2
absolute, is listed in the following table. The values
in the tables refer to nitrogen at 60°C and 1000hPa absolute according to IEC61207/3.
Table 9-3 Zero point error of organic gases
Accompanying gas (concentration 100vol.%) Zero point deviation in
vol.%O
2
absolute
Ethane C
2
H
6
-0.49
Ethene (ethylene) C
2
H
4
-0.22
Ethine (acetylene) C
2
H
2
-0.29
1.2 butadiene C
4
H
6
-0.65
1.3 butadiene C
4
H
6
-0.49
n-butane C
4
H
10
-1.26
Isobutane C
4
H
10
-1.30
1-butene C
4
H
8
-0.96
Isobutene C
4
H
8
-1.06
Dichlorodi󹪞uoromethane (R12) CCl
2
F
2
-1.32
Ethanoic acid CH
3
COOH -0.64
n-heptane C
7
H
16
-2.40
n-hexane C
6
H
14
-2.02
Cyclo-hexane C
6
H
12
-1.84
Commissioning
9.5Zero point error
Wall-mounted device
130 Operating Instructions, 07/2023, A5E31930403-AB

Siemens SIPROCESS GA700 Specifications

General

Brand	Siemens
Model	SIPROCESS GA700
Category	Measuring Instruments
Language	English