Emerson 51-DO-04 Manuel D’Utilisation

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.

Temperature

10.3

Dissolved oxygen

10.4

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