Rdo Diagnostics - ABB AWT420 Operating Instruction

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B

RDO diagnostics

NAMUR Diagnostic
icon message
S(n):
PT Failure
S(n):
D.O Conc
Meas Error
S(n):
%Sat Meas Error
S(n):
Calibrating
S(n):
Internal
Comms Error
S(n):
Cap Removed
S(n):
Cal Failed
S(n):
User Cal Expired
S(n):
Factory Cal
Expired
S(n):
Sensor Warm-up
S(n):
Sensor Warning
S(n):
Cap Expired
S(n):
Replace Cap
Cause
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.
The RDO sensor cannot provide a valid
dissolved oxygen measurement due to a sensor
error.
The RDO sensor cannot provide a valid %
saturation measurement due to a sensor error.
Sensor calibration is in progress.
The RDO sensor cannot provide a valid
dissolved oxygen measurement due to an error
in the communication between sensor and
sensor cap.
The sensor cap has been removed from the
RDO probe or is not being recognized.
A valid measurement cannot be made without
a sensor cap
The most recent sensor calibration has failed,
calibration coefficients have not been updated
and the previous values continue to be applied.
Recalibration of the RDO sensor is required.
The sensor deteriorates over time and
recalibration is required to maintain accuracy.
Recalibration of the RDO sensor is required.
The sensor deteriorates over time and
recalibration is required to maintain accuracy.
The RDO sensor is warming up and cannot
provide a valid dissolved oxygen measurement
until the internal electronics have stabilized.
PV measured from the RDO probe but does not
meet normal quality criteria.
The sensor has sustained moderate damage, or
the recommended lifespan has been reached.
The sensor cap within the RDO probe has
reached or exceeded its expiry date.
The cap may continue to operate but its
accuracy degrades and cannot be guaranteed
to meet specification.
The sensor cap within the RDO probe reaches
its expiry date within 4 weeks.
After its expiry date the cap may continue to
operate but its accuracy degrades and cannot
be guaranteed to meet specification.
Recovery action
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.
Power cycle sensor.
If Dissolved Oxygen Concentration Measurement Error persists,
contact local service organization.
Power cycle sensor.
If % Saturation Measurement Error persists, contact local service
organization.
Diagnostic clears once calibration is complete.
Ensure that the sensor cap is installed and properly seated.
Ensure sensor cap is fitted correctly.
Ensure that the sensor is clean and fully submerged in the solution.
Repeat calibration, if Calibration Failed persists then consider
replacing the sensor.
Perform a calibration using ADS430205 RDO probe calibration kit.
Perform a calibration using ADS430205 RDO probe calibration kit.
Diagnostic clears once the internal electronics have stabilized.
If Sensor Warm Up persists, contact local service organization.
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.
Replace sensor cap using ADS430204 ABB RDO probe sensor cap
replacement kit.
Replace sensor cap using ADS430204 ABB RDO probe sensor cap
replacement kit.
89