Table 16-6: Process variables problems and remedies
(continued)
Symptom Cause Suggested remedy
Inaccurate flow rate
or batch rate
Bad flow calibration factor Verify characterization. See Characterize the
meter (if required).
Inappropriate measurement unit Check calibration.
Bad sensor zero Resize the flow meter. See Zero the meter.
Bad density calibration factors Verify characterization. See Characterize the
meter (if required).
Bad flow meter grounding See Check grounding.
Slug flow See Check for two-phase flow (slug flow).
Problem with receiving device Test with another receiving device.
Wiring problem Check the sensor circuitry. See Check for
internal electrical problems.
Inaccurate density
reading
Problem with process fluid Use standard procedures to check the quality
of the process fluid.
Bad density calibration factors Verify characterization. See Characterize the
meter (if required).
Wiring problem Check the sensor circuitry. See Check for
internal electrical problems.
Bad flow meter grounding Check the sensor circuitry. See Check
grounding.
Slug flow Check the environment for sensor with a
similar (±0.5 Hz) tube frequency.
Sensor cross-talk Check the sensor circuitry. See Check for
internal electrical problems.
Plugged flow tube Check drive gain and tube frequency. Purge
the flow tubes.
Incorrect sensor orientation Sensor orientation must be appropriate to
process fluid. See the installation manual for
your sensor.
RTD failure Check for alarm conditions and follow the
troubleshooting procedure for the indicated
alarm.
Physical characteristics
of the sensor have changed
Check for corrosion, erosion, or tube damage.
Temperature reading
significantly different
from process temperature
RTD failure Check for alarm conditions and follow
troubleshooting procedure for indicated
alarm.
Temperature reading
slightly different
from process temperature
Sensor leaking heat Insulate the sensor.
Unusually high density
reading
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes.
Incorrect K2 value Verify characterization. See Characterize the
meter (if required).
Configuration and Use Manual Troubleshooting
MS-00809-0200-1600 May2024
Configuration and Use Manual 217
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