GE DigitalFlow DF968, Service Manual

Page: 27 / 78

Error Codes and Screen Messages 2-3
March 2008
E4: Signal Quality
Problem:
The signal quality is outside the limits programmed in the
SETUP
submenu of the User Program .
Cause:
Too high a signal strength may be caused by the failure of
an electronic component. Too low a signal strength may
be caused by a flowcell or electrical problem.
Action:
Check for sources of electrical interference and verify the
integrity of the electronics console by temporarily
substituting a test flowcell that is known to be good.
Check the transducers and relocate them, if necessary.
See Chapter 3,
Diagnostics , for instructions.
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.