Siemens ULTRAMAT 23 Series - Fault Messages and Troubleshooting

• Message "UV LED current beyond tolerance"
• Message "External maintenance request"
These are signaled via the binary inputs. The analyzer must be equipped with an add-on
board for this.
• Message "Combined maintenance request"
Possible causes:
– External ELAN broadcast timeout
– External ELAN broadcast status ("Fault" or "Function check")
See also
Con󹪝guration: Special functions: Fact.data/Reset/Units:Various switches (Page 153)
11.2 Faults
Fault messages are references to certain changes in the analyzer which in󹪞uence its ability to
measure correctly. In such cases remedial measures are required.
If the analyzer is in measuring mode, you can recognize the occurrence of a fault in that an "F"
appears at the right edge of the measurement screen.
Mains voltage
beyond tolerance
Press ENTER to clear
Next message with ->

Faults are logged and can be called in input mode using the menu
path "Analyzer status - Status - Logbook/faults" (see section Diagnos‐
tics: Diagnostics values (Page 105)). The corresponding message
texts are stored as alphanumeric text in the logbook. You can delete
the messages by pressing the <ENTER> key. However, they appear
again if the cause has not been eliminated.
The following table provides a summary of fault messages, their causes, and measures to
eliminate the faults.
If nothing is speci󹪝ed for a fault message in the 'Remedy' column, you must contact the servicing
department when this message occurs.
Message Possible causes Remedy
Measured value channel 1, 2 or 3 be‐
yond tolerance,
Measured value display: *****
Concentration of sample gas above the
measuring range
Reduce the sample gas concentration
Corresponding IR or UV channel is faulty Applies to IR and UV components
Measured value H2S beyond toler‐
ance,
Measured value display: *****
Concentration of sample gas above the
measuring range
Reduce the sample gas concentration
Sensor faulty Replace the H
2
S sensor as described in
section Replacing the hydrogen sul󹪝de
sensor (Page 174)
Measured value O2 beyond tolerance,
Measured value display: *****
Concentration of sample gas above the
measuring range
Reduce the sample gas concentration
Electrochemical O
2
sensor faulty or no
longer usable as result of aging
Replace the electrochemical O
2
sensor as
described in section Replacing the elec‐
trochemical oxygen sensor (Page 173).
Error and system messages
11.2 Faults
ULTRAMAT 23
180 Equipment Manual, 04/2022, A5E37100388-012