Why does LGF electromagnetic flowmeter show negative flow reading? How to fix it?

Negative flow readings in electromagnetic flowmeters typically occur due to several factors: reverse fluid flow, incorrect electrode wiring, or improper sensor installation orientation. Ecolor Technology's LGF series electromagnetic flowmeters require systematic troubleshooting when negative flow issues arise.

Main causes and solutions include:

• Actual reverse fluid flow: Check valve positions and pipeline system for potential backflow conditions
• Incorrect electrode wiring: Verify excitation coil and signal electrode connections according to LGF series wiring diagrams
• Wrong sensor installation direction: Ensure flowmeter arrow direction aligns with media flow direction
• Zero point drift: Perform zero calibration to eliminate measurement offset
• Electromagnetic interference: Check grounding integrity and distance from high EMI equipment

For LGF electromagnetic flowmeters ranging DN10-DN2000, regular zero-point calibration and flow direction verification maintain the ±0.5% measurement accuracy specification.