MODEL | SECTION 10.0 |
| DIAGNOSIS AND TROUBLESHOOTING |
10.8.7 OFFSEt Err
The OFFSEt Err message appears if the zero offset (in mV) exceeds the programmed limit. Before increasing the limit to make the OFFSEt Err message disappear, check the following:
1.Verify that the reference meter is working properly and is properly calibrated.
2.Verify that the process sensor is working. Check its response in a solution of known conductivity.
3.If the transmitter is standardized against the conductivity determined in a grab sample, be sure to measure the con- ductivity before the temperature of the grab sample changes more than a few degrees.
4.Verify that the process sensor is fully immersed in the liquid. If the sensor is not completely submerged, it may not properly measure the conductivity of the process liquid.
5.Check the sensor for cleanliness. If the sensor looks fouled or dirty, clean it. Refer to the sensor instruction manual for cleaning procedures.
10.8.8 FACt FAIL
FACt FAIL means the unit has not been factory calibrated. Call the factory. The transmitter will probably need to be returned to the factory for calibration.
10.8.9 CPU FAIL and ROM FAIL
CPU FAIL means that the processing unit has failed internal tests. ROM FAIL means that the internal memory has failed.
1.Cycle the power. Leave the transmitter without power for at least 30 seconds before returning power to it.
2.If cycling the power fails to clear the error message, the CPU board probably needs replacing. Call the factory for assis- tance.
10.8.10 AdC Error
AdC Error means the analog to digital converter has failed.
1.Verify that sensor 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.Disconnect sensor(s) and simulate temperature and sensor input.
3.If the transmitter does not respond to simulated signals, the analog PCB has probably failed. Call the factory for assis- tance.
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