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MODEL DO-03/04 SECTION 10.0
TROUBLESHOOTING
SECTION 10.0
TROUBLESHOOTING
10.1 OVERVIEW
The 54eA analyzer continuously monitors itself and the sensor for faults. When the analyzer detects a fault in the
oxygen sensor or in the instrument itself it displays a fault message. If alarm 4 was enabled, the red FAIL LED
will also light and relay 4 will activate. The outputs will go to 22.00 mA or to the value programmed in Section 5.5.
See Section 10.2 for an explanation of fault messages and suggested corrective actions.
The analyzer also displays error and warning messages if a calibration is seriously in error. Refer to the section
below for assistance. Each section also contains hints for correcting other measurement and calibration problems.
For troubleshooting not related to measurement problems, see Section 10.5.
To view diagnostic variables, go to the main display and press any key. Move the cursor to “Diagnostic variables”
and press Enter (F4). Use the or key to move up or down the list.
Measurement Section
Temperature 10.3
Dissolved oxygen 10.4
10.2 TROUBLESHOOTING WHEN A FAULT MESSAGE IS SHOWING
Fault message Explanation See Section
High input current input current exceeds 210 uA 10.2.1
Check sensor zero sensor current was too high when sensor was zeroed 10.2.2
Temp error low temperature less than -15°C 10.2.3
Temp error high temperature greater than 130°C 10.2.3
Sense line open RTD sense line is open 10.2.4
Failure factory instrument needs factory calibration 10.2.5
Failure eeprom write verify error has occurred 10.2.5