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What are the effects of an incorrectly “zeroed” electromagnetic flow meter?

When an electro-magnetic flow meter is installed, it should be pressurized with the process liquid and then “zeroed” for any inconsistency related to the installation effects.  If this is not done, the value being read during true zero flow will be additive (+ or -) to the actual readings causing great errors during a no flow condition or at least during low flow conditions above the low flow cut-off filter.

This is reviewed during any audit but not necessarily during an annual calibration.

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