Message Possible causes Remedy
Measured value O2 too low
Measured value display: *****
O
2
sensor faulty or no longer usable as
result of aging
Replace the O
2
sensor as described in sec‐
tion Replacing the electrochemical oxy‐
gen sensor (Page 173)
O
2
sensor zero not calibrated Calibrate the zero point of the O
2
sensor
as described in section Calibration: Elec‐
trochemical oxygen measuring range
(Page 117)
Fault at analog output Output component could not be initial‐
ized when switching on
Limits were violated when calibrating the
analog section
General fault of all IR channels,
Measured value display: *****
Chopper faulty
Fault of addresses for IR channels Plug-in jumper on detector for detection
of components not OK
The cable of the detector has no contact Check that the plug is correctly connected
to the detector (the plug must latch in
twice).
Cable of detector faulty
AUTOCAL drift beyond tolerance Detector contaminated
Receiver chamber faulty
IR source power too low
AUTOCAL drift beyond tolerance (UV) UV analyzer chamber is dirty or defective
EEPROM error Checksum not OK
Read character does not correspond to
written character
UV EEPROM error
Checksum not OK
Read character does not correspond to
written character
Channel 1, 2 or 3 not calibrated
Calibration of full-scale value / sag missing Perform a customer calibration, if the
message has not disappeared the service
technician must perform a 3 point cali‐
bration using a calibration gas mixer.
Component 1, 2, 3 or 4 selected but
not calibrated
Calibration of full-scale value / sag missing Perform a customer calibration, if the
message has not disappeared the service
technician must perform a 3 point cali‐
bration using a calibration gas mixer.
Source voltage outside tolerance (IR) IR source not OK
Motherboard faulty
UV module voltage beyond tolerance
Supply voltage varies Take appropriate measures so that the
supply voltage remains stable within the
tolerance values permissible for the ana‐
lyzer.
Power supply unit faulty
Cables of the UV module faulty
Power supply of the UV module faulty
UV LED current beyond tolerance (1-4) Light source (LED) faulty Error in optical component.
Replace the UV module.
Error and system messages
11.2 Faults
ULTRAMAT 23
182 Equipment Manual, 04/2022, A5E37100388-012
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