Chapter 2. Error Codes and Screen Messages
16
DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual
2.2 Error Codes
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).
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.
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