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What should be paid attention to when measuring formic acid and formic acid flow with electromagnetic flowmeter?

Formic acid flow measurement, electromagnetic flowmeter can measure, formic acid: conductivity is 55.0×10 ˉ 4s/cm; Formic acid: Take the concentration of 4.94% as an example, the temperature is 18℃, and the conductivity is 55.0×10 ˉ 4s/cm; Are greater than the lowest conductivity of electromagnetic flowmeter.