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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