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TIDM-LC-WATERMTR: Is the runtime re-calibration mandatory? and how to avoid magnetic interference?

Part Number: TIDM-LC-WATERMTR

Team,

Here's 2 questions on flowmeter solution.

1.The customer started to use ESI to measure the gas flow. however, they don't want to do runtime re-calibration because ST device does not need to do the runtime recalibration. is this calibration mandatory?

2. even if they are using ESI and metal plate to measure the flow with inductive sensor, still they can't measure the flow well. when the magnet is near sensor, oscillation decreases a lot and it's fail to sense the rotation. how to avoid this kind of interference? it's now mandatory for MP. 

Best Regards,

Ted