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Configuration and Use Manual 205
Diagnostics and Troubleshooting
Diagnostics and Troubleshooting Specifications – Model 3350/3700Specifications – Model 3300/3500Measurement Performance
Inaccurate flow rate or batch total Bad flow calibration factor Verify characterization. See
Section 7.3.3.
Inappropriate measurement unit Check configuration. See
Section 22.13.
Bad sensor zero Rezero the meter. See Section 16.3.
Bad density calibration factors Verify characterization. See
Section 7.3.3.
Bad flowmeter grounding See Section 22.11.3.
Slug flow See Slug flow alarms in Section 22.7.3.
Problem with receiving device See Section 22.11.6.
Wiring problem Verify all sensor-to-transmitter wiring
and ensure the wires are making good
contact.
Inaccurate density reading Problem with process fluid Use standard procedures to check
quality of process fluid.
Bad density calibration factors Verify characterization. See
Section 7.3.3.
Wiring problem Verify all sensor-to-transmitter wiring
and ensure the wires are making good
contact.
Bad flowmeter grounding See Section 22.11.3.
Slug flow See Slug flow alarms in Section 22.7.3.
Sensor cross-talk Check environment for sensor with
similar (±0.5 Hz) tube frequency.
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes or replace the
sensor.
Temperature reading significantly
different from process temperature
RTD failure Check for alarm conditions and follow
troubleshooting procedure for indicated
alarm.
Verify polling configuration and disable
polling for temperature if appropriate.
See Section 7.6.
Problem with sensor wiring Check wiring to sensor. See
Section 22.11.2.
Incorrect calibration factor Verify that the temperature calibration
factor is set correctly. See
Section 22.17.
Temperature reading slightly different
from process temperature
Temperature calibration required Perform temperature calibration. See
Section 21.6.
Loose connections in sensor wiring Check wiring to sensor. See
Section 22.11.2.
Corrosion in flow tube Purge the flow tubes.
Unusually high density reading Plugged, partially filled, or coated flow
tube
Check drive gain and tube frequency.
See Section 22.18.
Purge the flow tubes.
Incorrect K2 value Verify characterization. See
Section 22.16.
Table 22-1 Process variables problems and possible remedies continued
Symptom Cause Possible remedy