August 2008
3-12 Operation
Error Messages To indicate a possible problem during a measurement, Error
Messages may occasionally appear on the PT878 display. The
possible Error Messages, along with tips for isolating and correcting
the problem, are listed in Table 3-1 below.
Note: On a graphical display, errors are indicated by a vertical gray
bar at the point of the error. On a numeric display, errors are
indicated by an error code in place of the measurement.
Table 3-1: Error Code Messages
Error Problem Possible Cause Action
E0 No error
• Displays briefly after clearing
another error message
None required - measurement is
valid.
E1 Low Signal - Poor
ultrasonic signal strength
• Broken cable
• Flowcell problem
• Transducer problem
• Electronic failure
• Check transducer cable
• Check programming and
transducer spacing
• Contact the factory if problem
persists.
E2 Sound Speed Error
• Poor flow conditions
• Incorrect programming
• Bad transducer spacing
• Measurement is very different
from the programmed sound
speed
• Check sound speed against
nominal sound speed
• Check programming and
transducer spacing
E3 Velocity Range - Velocity
exceeds programmed
limits
• Programming error
• Poor flow conditions
• Bad transducer spacing
• Make sure flow rate is within
±12 m/s (±40 ft/s)
• Check programming and
transducer spacing
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
in fluid
• High second phase percentage
• Check for flowcell problems
E6 Cycle skip, Acceleration
• Poor flow conditions
• Bad transducer spacing
• Check transducer spacing as
programmed and as set on pipe
E7 Analog Out Error
• Under current output • Check that output load is <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
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