How to diagnose and handle zero drift in electromagnetic flowmeters? What are the common causes?
EMF zero drift mainly caused by electrode contamination, liner wear, and poor grounding requiring systematic diagnosis
Electromagnetic flowmeter zero drift is a common issue affecting LGF series flowmeter measurement accuracy, requiring systematic diagnosis and treatment. Common causes include:
- Electrode contamination: Oil, grease, and scaling substances adhering to electrode surfaces
- Liner wear: Long-term use causing PTFE or rubber liner aging and deformation
- Poor grounding: Excessive ground resistance or corroded/broken ground wires
- Excitation system failure: Reduced excitation coil insulation or unstable excitation current
- Environmental interference: Strong electromagnetic fields, vibration, or temperature variations
Treatment methods: First perform zero-point verification to confirm drift magnitude, then check electrode resistance and insulation resistance. For flowmeters connected to EC32/EC60 series RTU remote terminals, remote diagnosis via 4G communication is possible. Electrode cleaning, re-grounding, and component replacement are standard maintenance procedures. Severe cases require factory recalibration.
Maintenance & After-sales
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