4-5
Hardware and Software Maintenance and Troubleshooting
Output with No Actual Flow Basics
• Perform basic checks for Incorrect 4–20 mA
Output Problem (see Incorrect 4–20 mA Output
on page 4-3).
• Check and correct configuration parameters in
this order:
K-factor, service type, materials, units, process
temperature, damping value,4–20 mA trim, meter
body number, density, pulse mode, pulse scaling,
line size, pipe diameter, LRV, URV, LP corner,
trigger level, low flow cutoff.
• Check sizing. Make sure flow is within
measurable flow limits.
• Using a HART-based communicator, read the
shedding frequency.
• Refer to Advanced Troubleshooting on page 4-6.
Vibration Problem
• Adjust signal processing parameters:
Adjust low flow cutoff to higher flow rates (if the
application allows). Move the low flow cutoff up
one notch and measure the process variable.
Continue moving the low flow cutoff
until the problem is corrected or the flow range is
too limited for the application.
Adjust the trigger level up; the default trigger level is
four. Adjust it one notch and measure the process
variable. Continue moving the trigger level until the
output reaches zero or the trigger level reaches a
value of seven. Be sure to check the process
variable with the process flowing once you are done
adjusting the
trigger level.
• Rotate the meter 90 degrees.
• Add support to the line near the meter to damp
the vibration.
50/60 Hz Measurement
• Make sure electronics mounting screws (3) are
securely installed.
• May indicate electrical or magnetic interference.
Check meter ground. Measure voltage levels
between 4–20 mA and pulse outputs and the
electronics housing. Common mode voltage <30
Vrms.
• If the meter is located near a large motor or
electric furnace try different meter orientations to
reduce the noise. Magnetic fields must be less
than 5 gauss.
• In remote mount installations, try integral mount
to see if problem is corrected. Measure ac
voltage from electronics housing to SMA
connector. The voltage must be <1Vrms.
Application Problems
• Pump pulsations disturbing flow. Adjust signal
processing parameters.
• Add flow straightener.
• Check all valves and make sure they are closed.
Symptom Corrective Action
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