GE DigitalFlow DF968, Service Manual

Page: 26 / 78

March 2008
2-2 Error Codes and Screen Messages
E0: No Error
Problem:
No error condition currently exists.
Cause:
This message appears briefly to confirm that the response
to another error message has corrected the problem.
Action:
No action is required.
E1: Low Signal
Problem:
Poor ultrasonic signal strength or the signal exceeds the
limits entered via the
User Program .
Cause:
Poor signal strength may be caused by a defective cable,
a flowcell problem, a defective transducer or a problem
in the electronics console. A signal that exceeds the
programmed limits is probably caused by the entry of an
improper value in the
SETUP SIGNL
submenu of the User
Program .
Action:
Using the procedures in Chapter 3, Diagnostics , check
the components listed above. Also, check the value
programmed into the
SETUP SIGNL
submenu, as described
in the Programming Manual (page 1-31 for the 1-channel
DF868, or page 1-25 for the 2-channel DF868).
E2: Sound Speed Error
Problem:
The sound speed exceeds the limits programmed in the
SETUP SIGNL
submenu of the User Program .
Cause:
The error may be caused by incorrect programming, poor
flow conditions or poor transducer spacing.
Action:
Compare the measured sound speed to tabulated nominal
values for the fluid being used and correct any
programming errors. Refer to Chapter 3,
Diagnostics , to
correct any flowcell and/or transducer problems (pages
3-5 to 3-8).
E3: Velocity Range
Problem:
The velocity exceeds the limits programmed in the
SETUP
submenu of the User Program .
Cause:
This error may be caused by the entry of improper
programming data or by poor flow conditions and/or
excessive turbulence.
Action:
Make sure the actual flow rate is within the programmed
limits. See the
Programming Manual for details. Refer to
Chapter 3, Diagnostics , to correct any flowcell and/or
transducer problems (pages 3-5 to 3-8).