Symptoms: Transmitter does not power up.
Possible Causes Recommended Action
• No power or inadequate power
• Blown fuse (AC Model only)
• Display ribbon cable not seated
properly
• Measure voltage at the power terminals and check that the voltage matches the labels by the
power terminals.
• Check the fuse near the power terminals. If fuse is blown, verify the voltage and polarity is
correct and reset the fuse.
• Inspect ribbon cable connections. LED’s on power board will light up – with no LCD display.
• Replace the transmitter if the above actions do not resolve the issue.
Symptoms: Flow reading appears to be incorrect.
Possible Causes Recommended Action
• Incorrect positioning of
transducers
• Poor contact between
transducers and pipe
• Poor placement of transducers
• Low signal strength
• Process loop issues
• Incorrect pipe settings
• Meter not calibrated?
• Display not set up correctly
Refer to the Transducer Mounting Configuration section for details on proper installation.
At the transducer:
• Verify that the spacing of the transducers is set correctly. On most transducers, a scribe mark on
the side of the transducers indicates the point of measurement—NOT from the end points of
the transducers.
• Verify that the transducers are aligned correctly. For Z-Mount, verify the transducers are 180°
from each other.
• Make sure there is a good contact between the transducers and pipe and a thin coat of acoustic
coupling is applied. For integral mount, check for over-tightening of the transducers.
Process loop and general location:
• Make sure the transducers are on the sides of the pipe and NOT on the top of the pipe.
• Check that the transducers are NOT located at the highest point in the loop where air may
accumulate.
• Check that the transducers are NOT on a downward flowing pipe unless adequate downstream
head pressure is present to overcome partial filling or cavitation.
• Check that the transducers have adequate straight pipe upstream and downstream.
• Check process loop for entrained air or particulates which will impact the flow readings.
• Pipes may develop scale, product build-up or corrosion over time. As a result, the effective wall
thickness may be different than a new pipe and wall thickness or liner parameters may need to
be adjusted (PIPE WT, LINER T, LINER MA, LINER SS, LINER R).
At the transmitter:
• Verify that parameters match the installation: XDCR MNT, XDCR HZ, PIPE OD, PIPE WT, PIPE MAT,
PIPE SS, PIPE R, LINER T, LINER MA, LINER SS, LINER R, FL TYPE, FLUID SS, FLUID VI, SP GRAVITY.
• Check that the SIG STR parameter in the Service Menu (SER MENU) is between 5…98.
◊ If the signal strength is greater than 98, change the mounting to increase the path length.
For example from a Z-mount to V-mount or a V-mount to a W-mount. Repeat the startup
and configuration steps.
◊ If the signal strength is less than 5, change the mounting to decrease the path length. For
example from a W-mount to a V-mount or a V-mount to a Z-mount. Repeat the startup and
configuration steps.
• Zero the meter. See “DTTS/DTTC Small Pipe Transducer Calibration Procedure” on page88..
Symptoms: Unstable flow.
Possible Causes Recommended Action
• Installation issues
• Flow instability
• Transducers mounting is loose
• Transducers are moved
• Check process loop for variations of entrained air which will impact the flow
• Check for pump induced flow instability.
• Ensure the transducers are secure and are in area where the transducers will not be
inadvertently bumped or disturbed.
Troubleshooting
Page 89 May 2016 TTM-UM-00136-EN-06
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