90 AW T420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
…16 Troubleshooting
…Diagnostic messages
TSS diagnostics
NAMUR
icon
Diagnostic
message
Cause Recovery action
S(n):
Failure of the analog to digital converter in the
sensor/sensor module.
Cycle power to the transmitter.
If Sensor ADC Failure persists, contact local service organization.
S(n):
Memory Failure
Sensor configuration data is corrupt, or the
sensor’s non-volatile memory is faulty.
The sensor configuration may be affected and
changes may not be maintained after power
cycle.
Cycle power to the transmitter.
If Sensor Memory Failure persists, check all configuration parameters for
via Bluetooth App.
Reset the sensor to defaults from the Sensor Setup menu and reload the
saved configuration.
If Sensor Memory Failure persists, contact local service organization.
S(n):
PV Failure
A primary variable reading cannot be obtained
illuminating the sample.
Ensure that the sensor is clean: If available, initiate a Manual Clean from
the Operator menu, otherwise remove the sensor from the process and
clean manually.
Cycle power to the transmitter.
If PV Failure persists, contact local service organization.
S(n):
Wiper Failed
The wiper has failed to wipe.
Sensor becomes soiled. Measurement quality
is affected due to inadequate cleaning.
Visually inspect the sensor and clean any obstructions/blockages.
S(n):
Calibrating
Sensor calibration is in progress.
S(n):Recovery Recovery diagnostic is active during the period
between completion of a sensor calibration and
the sensor being ready to make accurate
measurements.
S(n):
Clean Inhibited
Automatic cleaning with the wiper is inhibited
by configuration.
The quality of the Turbidity/Suspended Solids
measurement is affected and the sensor
lifespan may be reduced.
Perform a Manual Clean from the operator menu.
Set the Wiper Clean Frequency.
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: If available, initiate a Manual Clean from
the Operator menu, or remove the sensor from the process and clean
manually.
If using formazine standards, ensure that the solutions have been
correctly made up.
Note: Formazine preparations settle in the solution, shake the solution
well prior to the calibration.
Repeat calibration, if Calibration Failed persists, consider replacing the
sensor.
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