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Message
Bridge supply voltage beyond toler‐
ance
Half-bridge voltage beyond tolerance
Lockin error
Sensitivity of O2 sensor too low
External ADC error
External fault
H2S Probe Protection
Zero point of H2S sensor too high
Sensitivity of H2S sensor too low
UV module does not respond
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012
Possible causes
Channel amplifier of IR receiver faulty
Motherboard faulty
Channel amplifier of IR receiver faulty
Motherboard faulty
Channel amplifier of IR receiver faulty
Motherboard faulty
O
sensor faulty or no longer usable as
2
result of aging
Electronics faulty
Signaling of an external fault (system-spe‐
cific)
H2S protection function: sample gas con‐
centration too high
Purge time too short for calibration
Sensor exhausted
Power supply unit faulty
Cable of the UV module faulty or not con‐
nected
Power supply of the UV module faulty
Error and system messages
Remedy
Replace the O
sensor as described in sec‐
2
tion Replacing the electrochemical oxy‐
gen sensor (Page 173)
Check the connected devices for faults as
described in section Configuration: In‐
puts/outputs/pump: Binary/sync inputs
(Page 143).
Check sample gas, see also section Probe
protection function (Page 157)
Repeat calibration
Replace sensor
11.2 Faults
183
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