AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
85
2-electrode conductivity 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):
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.
If Process Temperature Failure persists, contact local service
organization.
S(n):
PV Failure
A primary variable reading cannot be obtained
from the conductivity sensor.
Visually inspect the sensor for signs of damage.
Cycle power to the transmitter.
If PV Failure persists, contact local service organization.
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):
Cal Failed
The most recent sensor calibration has failed,
calibration coefficients have not been updated
and the previous values continue to be applied.
Visually inspect sensor for signs of damage or dirt and clean if necessary.
Check that sensor is fully submerged in the solution.
Repeat calibration, if Calibration Failed persists, consider replacing the
sensor.
S(n):
PV Out of Limits
Process value (PV) measured is outside the
specified limits of the sensor.
Refer to the sensor data sheet to determine the
operating range.
Check the process and the position of the sensor.
If PV Out of Limits is consistently active it may be necessary to replace
the sensor with an alternative with a wider, or more appropriate
operating range. Contact local service organization for potential
solutions
S(n):Process
Temp Out of
Range
Solution temperature is outside the
measurement range of the sensor.
Refer to the sensor data sheet to determine
the temperature range.
Ensure that the solution temperature is within the sensor measurement
limits.
Check the process and reduce the effect of any potential heat sources.
If Process Temperature Out of Range is consistently active it may be
necessary to replace the sensor with an alternative with a wider, or more
appropriate temperature range. Contact local service organization for
potential solutions.
S(n):Internal
Temp Out of
Range
The sensor module measurement circuitry is
operating at a temperature outside its
recommended range.
This may cause the measurements to be
inaccurate.
Ensure that the ambient temperature of the transmitter containing the
If Internal Temperature Out of Range persists, contact local service
organization.
S(n):
Polarization
Sensor readings indicate that a polarization
conductivity sensor.
When a charge builds up in the sensor, the
effective area of the electrode is decreased,
causing the measurement to be inaccurate.
Check process.
Visually inspect the sensor and clean if necessary.
Check sensor wiring.
If Sensor Polarization
sensor may be more suitable for the process, contact local service
organization.
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