Siemens ULTRAMAT 23 Manual page 180

Error and system messages
11.2 Faults
Message
AUTOCAL drift beyond tolerance
EEPROM error
Channel 1 not calibrated
Channel 2 not calibrated
Channel 3 not calibrated
Voltage for IR source beyond toler-
ance
Bridge supply voltage outside toler-
ance
Half-bridge voltage outside tolerance
Lockin error
Sensitivity of O sensor too low
2
External ADC error
External fault
H S protection function
2
Zero point of the H S sensor beyond
2
tolerances
Sensitivity of H S sensor too low
2
180
Possible causes
Cable of detector faulty
Detector contaminated
Receiver chamber faulty
IR source power too low
Checksum not OK
Read character does not correspond to
written character
Calibration of full-scale value / sag miss-
ing
Calibration of full-scale value / sag miss-
ing
Calibration of full-scale value / sag miss-
ing
IR source not OK
Motherboard faulty
Channel amplifier faulty
Motherboard faulty
Channel amplifier faulty
Motherboard faulty
Channel amplifier faulty
Motherboard faulty
O sensor faulty or no longer usable as
2
result of aging
Electronics faulty
Signaling of an external fault (system-
specific)
Sample gas concentration too high
Purge time too short for calibration
Sensor exhausted
Remedy
Replace the O sensor as described in
2
section Replacing the electrochemical
oxygen sensor (Page 171)
Check the connected devices for faults
as described in section Configuration:
Inputs/outputs/pump: Binary/sync inputs
(Page 141).
Check sample gas, see also section
Probe protection function (Page 156)
Repeat calibration
Replace sensor
Manual, 3/2016, A5E37100388-003
ULTRAMAT 23