GE DigitalFlow DF868, Service Manual

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DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual 17
Chapter 2. Error Codes and Screen Messages
E5: Amplitude Error
Problem:
The signal amplitude exceeds the limits programmed in the
SETUP
submenu of the User Program .
Cause:
Excessive levels of an attenuating gas, such as CO
2
, are present in the flowcell. Solid or liquid particulates
may be present in the flowcell.
Action:
Refer to Chapter 3, Diagnostics , to correct any flowcell problems (page 3-5).
E6: Cycle Skip, Accel.
Problem:
The acceleration exceeds the limits programmed in the
SETUP
submenu of the User Program .
Cause:
This condition is usually caused by poor flow conditions or improper transducer spacing.
Action:
Refer to Chapter 3, Diagnostics , to correct any flowcell and/or transducer problems (pages 3-5 to 3-8).
E7: Special Input
Problem:
This message indicates a 4-20 mA input programmed for a special diagnostic is out of valid input range.
Cause:
Bad connection between transmitting device and input card, broken transmitter, or broken analog input on
option card.
Action:
Test analog input, verify wiring, test transmitter.
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.