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Coriolis Flowmeter Fault Finding Guide

A one page guide to coriolis meter problems: zero stability, gas or solids in liquids, drive gain, density and mounting stress.

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A one page A4 guide to print for the workshop or keep on your phone in the field. The full content is also shown below.

Symptom	Likely causes	Checks and fixes
Flow at zero	Zero not set at process conditions, mounting stress, valve passing	Zero with line full and still; check supports; confirm valves
Noisy flow and density	Gas bubbles or solids (two phase), cavitation	Raise pressure; check drive gain; locate meter lower in line
Density wrong	Coating, erosion, gas entrainment, wrong calibration	Check with lab sample; clean or check tubes
High drive gain	Two phase flow, coating, tube damage	Remove gas; inspect; contact maker if persistent
Reading shifts with temperature	Zero not done at operating temperature, stress	Re zero hot; check pipe expansion and supports
Sensor fault alarm	Pickoff or drive coil failure, cable fault	Check cable and terminal resistance per manual

Status	Meaning	Action
F Failure	Output invalid	Repair or replace; check loop goes to safe state
C Function check	Simulation, calibration or maintenance active	Finish the work, return to normal mode
S Out of specification	Operating outside limits or uncertain	Check process conditions and sensor
M Maintenance required	Still valid but degrading	Plan maintenance before failure

When should a coriolis meter be zeroed?

At commissioning and after changes, with the meter full, flow stopped and at process temperature and pressure.

What does high drive gain mean?

The meter works harder to vibrate the tubes, often because of gas or coating.

Does coriolis need straight pipe?

Usually not, but supports and no stress are important.

Coriolis flow meter uncertainty

A practical guide on instrumentationblog.in with more background on this equipment.