83
Reference Manual
00809-0100-4772, Rev FA
Troubleshooting
March 2016
Troubleshooting
Table 7-1. Basic Troubleshooting
Symptom Corrective action
Expected flow in
pipe does not
match the
transmitter flow
reading
Basics
Check and verify configuration parameters in this order: K-factor, process fluid,
transmitter mode, fixed process temperature, fixed process density, density ratio,
pipe diameter, trigger level, low-flow cutoff, and low-pass corner frequency.
Check sizing. Make sure the predicted flow is within the measurable flow limits.
See Appendix C: Electronics verification for electronics verification procedure.
Possible application problems
If the process is air or a gas and when reading in standard or normal units, verify the
density ratio is correct. Also verify the process density is correct and the signal
processing filters are optimized for the process density.
Check signal_strength in the Transducer Block. Signal_strength should ideally be
greater than or equal to 4 to indicate a sufficient flow signal.
If using a remote mount installation, verify that no 50Hz or 60Hz interference is
coupling in to the flow meter and being interpreted as flow. Verify the remote sensor
cable is connected properly.
If the process is a liquid, check for flashing or cavitation. This will cause the flow
reading to be erratic. Check the line temperature and pressure. If possible, increase
back pressure.
Where applicable, verify viscosity and specific gravity requirements for the line size.
All installations
Verify any valve(s) in series with the meter are operating properly.
Verify there are no parallel bypass lines running flow.
Pipe/line vibration
Add support to the process piping as near the meter as possible. This will help to
dampen vibration at the meter.
If the vibration frequency is “in band” with the flow signal, it may be possible to
adjust the signal processing filters, specifically the low flow cutoff point to ignore the
vibration.
Rotate the meter body 90 degrees.
To Next Page
Loading...
