In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 27)

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Service
The RDO PRO-X Probe contains no user-serviceable parts. Do not attempt to open the
probe case or service the unit yourself.
RDO-X Software Troubleshooting
Sensor health diagnostics indicate when the RDO sensor has
been damaged in the field. If the sensor has sustained moderate
damage, the probe provides a DO value that includes a (DIS)
warning. The same warning is included with readings taken after
the sensor has reached its 24-month recommended lifespan.
However, if the sensor has been severely damaged, an error
message is shown and a DO value is not provided and the sentinel
value is shown. This prevents you from receiving an erroneous
reading.
The following error messages appear in the software when a sensor issue is detected.
Abbreviation Text Description
UC
User Cal
Expired Parameter measured without errors using an expired user
calibration.
FC
Factory
Cal
Expired
Parameter measured without errors using an expired
factory calibration.
ERR
Unknown
Error
Parameter measured with error, sentinel value supplied.
WU
Sensor
Warm-up
Sensor is warming up, sentinel value supplied.
DIS
Sensor
Disabled
Parameter measured but does not meet normal quality
criteria. Either the sensor has sustained moderate damage
or the 24-month recommended lifespan has been reached.
CAL
Sensor
Calibrating
Sensor is calibrating, calibration value supplied.
OL
Sensor
Offline Sensor communication failed, sentinel value supplied.
Make sure the sensor cap is installed and properly seated.