AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
89
RDO diagnostics
NAMUR
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Diagnostic
message
Cause Recovery action
S(n):
PT Failure
The measurement taken from the temperature
sensor is invalid indicating that the
temperature sensor has failed, or the
associated connections are either open-circuit
or short-circuit.
Visually inspect the sensor/temperature sensor for signs of damage.
A damaged sensor must be replaced.
Cycle power to the transmitter.
If Process Temperature Failure persists, contact local service
organization.
S(n):
Meas Error
dissolved oxygen measurement due to a sensor
error.
Power cycle sensor.
If Dissolved Oxygen Concentration Measurement Error persists,
contact local service organization.
S(n):
%Sat Meas Error
saturation measurement due to a sensor error.
Power cycle sensor.
If % Saturation Measurement Error persists, contact local service
organization.
S(n):
Calibrating
Sensor calibration is in progress.
S(n):
Internal
Comms Error
dissolved oxygen measurement due to an error
in the communication between sensor and
sensor cap.
Ensure that the sensor cap is installed and properly seated.
S(n):
Cap Removed
The sensor cap has been removed from the
A valid measurement cannot be made without
a sensor cap
Ensure sensor cap is fitted correctly.
S(n):
Cal Failed
The most recent sensor calibration has failed,
calibration coefficients have not been updated
and the previous values continue to be applied.
Ensure that the sensor is clean and fully submerged in the solution.
Repeat calibration, if Calibration Failed persists then consider
replacing the sensor.
S(n):
User Cal Expired
The sensor deteriorates over time and
recalibration is required to maintain accuracy.
S(n):
Factory Cal
Expired
The sensor deteriorates over time and
recalibration is required to maintain accuracy.
S(n):
Sensor Warm-up
provide a valid dissolved oxygen measurement
until the internal electronics have stabilized.
If Sensor Warm Up persists, contact local service organization.
S(n):
Sensor Warning
meet normal quality criteria.
The sensor has sustained moderate damage, or
the recommended lifespan has been reached.
Visually inspect the sensor for signs of damage.
If the probe appears to be in good condition and is within its
recommended lifespan, it may help to clean the sensor and the optical
lens.
If there are signs of damage or Sensor Warning persists, contact local
service organization.
S(n):
Cap Expired
reached or exceeded its expiry date.
The cap may continue to operate but its
accuracy degrades and cannot be guaranteed
to meet specification.
replacement kit.
S(n):
Replace Cap
After its expiry date the cap may continue to
operate but its accuracy degrades and cannot
be guaranteed to meet specification.
replacement kit.
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