GE DigitalFlow DF968, Service Manual

Page: 28 / 78

March 2008
2-4 Error Codes and Screen Messages
E8: Temp In Supply
Problem:
This message indicates a temperature input supply error.
Cause:
The temperature exceeds the specified limits for the
analog inputs option card.
Action:
Check the temperature transmitter and the connecting
cable. Refer to Chapter 1,
Calibration , and recalibrate the
analog inputs on the option card (page 1-6).
E9: Temp In Return
Problem:
This message indicates a temperature input return error.
Cause:
The temperature exceeds the specified limits for the
analog inputs option card.
Action:
Check the pressure transmitter and the connecting cable.
Refer to Chapter 1,
Calibration , and recalibrate the
analog inputs on the option card (page 1-6).
E10: Weak Signal
Problem:
This message indicates a weak signal.
Cause:
The magnitude of the two-phase signal is not large
enough or the flow rate in the pipe is out of range.
Action:
Check the pipe and setup parameters and the transducer
connections. The process may not include enough two-
phase content — switch to transit-time mode.
E11: Poor Signal
Problem:
This message indicates a poor signal.
Cause:
The shape of the processed signal is not good enough to
formulate a flow measurement.
Action:
Check the pipe and setup parameters and the transducer
connections. The process may not include enough two-
phase content — switch to transit-time mode.
E12: Incoherent Signal
Problem:
This message indicates an incoherent signal.
Cause:
The flow measurements, as determined by the two
Repetition Periods, are too dissimilar.
Action:
Check the pipe and setup parameters and the transducer
connections. The process may not include enough two-
phase content — switch to transit-time mode.