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MODEL 5081-T SECTION 10.0
DIAGNOSIS AND TROUBLESHOOTING
Message Explanation See Section
OuEr rAnGE Over range, measurement exceeds display limit 10.8.1
SEnSor FAIL Bad sensor, sensor current is a large negative number 10.8.2
CAL Error Calibration error, sensitivity (nA/ppm) is too high or too low 10.8.3
nEEd 0 CAL Sensor needs re-zeroing, reading is too negative 10.8.4
rtd FAIL Bad temperature reading 10.8.5
TEMP HI Temperature reading exceeds 275°C when auto temp is selected 10.8.5
TEMP LO Temperature reading is less than -25°C when auto temp is selected 10.8.5
SenSE OPEn Sense line is not connected 10.8.6
OFFSEt Err Zero offset during standardization exceeds programmed limit 10.8.7
FACt FAIL Unit has not been factory-calibrated 10.8.8
CPU FAIL Internal CPU tests have failed 10.8.9
ROM FAIL Internal memory has failed 10.8.9
AdC Error Analog to digital conversion failed 10.8.10
10.8.1 OuEr rAnGE and AMP FAIL.
These error messages appear if the sensor current is too high. Normally, excessive sensor current implies that the sensor
is miswired or the sensor has failed.
1. Verify that wiring is correct and connections are tight. Be sure to check connections at the junction box if one is being
used. See Section 3.0.
2. Replace the sensor membrane and electrolyte solution and clean the cathode if necessary. See the sensor instruction
sheet for details.
3. Replace the sensor.
10.8.2 SEnSor FAIL.
Bad sensor means that the sensor current is a large negative number.
1. SEnSor FAIL may appear for a while when the sensor is first placed in service. Observe the sensor current (go to
SEnSor Cur under the diagnostic menu). If the sensor current is moving in the positive direction, there is probably
nothing wrong and the error message should soon disappear.
2. Verify that wiring is correct. Pay particular attention the anode and cathode connections.
3. Verify that the transmitter is configured for the correct measurement. Configuring the measurement sets (among other
things) the polarizing voltage. Applying the wrong polarizing voltage to the sensor can cause a negative current.
4. Replace the sensor membrane and electrolyte solution and clean the cathode if necessary. See the sensor instruction
sheet for details.
5. Replace the sensor.
10.8 TROUBLESHOOTING WHEN A FAULT OR WARNING MESSAGE IS SHOWING
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