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Chapter 9. Diagnostics and Troubleshooting
Transport® Model PT878 Portable Liquid Flowmeter User’s Manual 205
E3
Velocity Range -
Velocity exceeds
programmed limits
(Velocity limit is
programmed using
the Service Menu
Error Limits option
as described in
Chapter 8.)
Programming error, poor
flow conditions, or bad
transducer spacing.
Make sure flow rate is within
±12m/s (±40 ft/s). Check
programming and transducer
spacing. If programmed value
is outside of limit, change the
limits as described in Chapter 8
on page 184. See Flowcell Prob-
lems on page 208 and Trans-
ducer Problems on page 210.
E4
Signal Quality If too high - electronic
failure.
If too low - flowcell,
electrical problem.
Check for source of electrical
interference. Check electronics
with a test flowcell. If unit still
fails to operate, contact the
factory
E5
Amplitude Error Excessive particles or
bubbles present in fluid.
A lot of second phase
present
See Flowcell Problems on
page 208.
E6
Cycle skip,
Acceleration
Poor flow conditions or
bad transducer spacing.
Check transducer spacing as
programmed and as set on
pipe. See Flowcell Problems on
page 208 and Transducer
Problems on page 210.
E7
Analog Out Error Under current output. Check that output load is within
specification <550 ohm.
E8
Temperature Input
Supply
Supply temperature
input out of range.
Check cable and transmitter.
E9
Temperature Input
Return
Return temperature
input out of range.
Check cable and transmitter.
Table 7: Error Messages (cont.)
Error Problem Possible Cause Action