Panametrics DigitalFlow GC868, Руководство по обслуживанию, Страница: 25 / 64

DigitalFlow™ GC868 Service Manual (1 and 2-Channel) 2-2
Chapter 2. Error Codes and Screen Messages
2.2 E0: No Error
Problem: No error condition currently exists.
Cause: This message appears briefly to confirm that the cause for a previous
error condition has disappeared, has cleared or been resolved.
Action: No action is required.
2.3 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, preamplifier
or decoupler, 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 PIPE or SETUP
SIGNL submenus of the User Program.
Action: Using the procedures in Chapter 3, Diagnostics, check the components
listed above. Also, check the value programmed into the PIPE or SETUP
SIGNL submenu, as described in the Operator’s Manual.
2.4 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, wrong transducer spacing or poor coupling.
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.
2.5 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.
2.6 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. Another cause may be a poor signal-to-noise ratio
for the measure mode cycle count technique.
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.
2.7 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
pipe. Solid or liquid particulates may be present in the pipe. The problem
could also be caused by excessive turbulence levels or rapid pressure
variations.
Action: Refer to Chapter 3, Diagnostics, to correct any flowcell problems.