Siemens SIPROCESS GA700 Operating Manual page 175

Note
Non-permitted activation of correction of cross-interference
If you activate correction of cross-interference before an external analyzer supplies
correction values, the device outputs the error message "[238] Interference gas measured
value uncertain or faulty".
• Check whether the external analyzer devices/analyzer modules are correctly connected
via MODBUS TCP or the analog outputs or inputs.
Make sure that signal transfer operates reliably.
• If necessary, adapt the parameter assignment of the MODBUS communication or at the
analog inputs of the device.
Note
Correction of cross-interference of the component CH
gas" application
In the applications mentioned, no correction of cross-interference is possible for the
component CH
gas 3 (CH
1. Menu [2.10]: → Change to Correction of cross-interference
2. Menu [2.10.5]: → Deactivate or set interference gas 3
See also
Assigning correction of cross-interference with a constant (Page 176)
Assigning variable correction of cross-interference (Page 177)
Correction of cross-interference in the application "H2 in N2 (Q)" for furnace gas, converter gas and
wood distillation
Overview: Application "H
Interference gases can be included in a measuring gas matrix invariable concentrations. The
concentration values are detected by external analyzers and fed in via MODBUS or the
analog inputs of the CALOMAT 7 analyzer module. With correction of cross-interference with
SIPROCESS GA700 devices, the linear correction coefficients are application-dependent
and are therefore set as default in the factory. No further parameter settings are required
Operating with the Local User Interface
Operating Manual, 06/2017, A5E31930478-05
. In this case, deactivate correction of cross-interference for interference
4
):
4
in N (Q)"
2 2
6.9 [2.10] Settings > Correction of cross-interferences
in the "furnace gas" and "converter
4
Functions
175