Selection of material for the measuring tube of mass flow meters
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For hydrogen fluoride liquid as the medium at room temperature, what material should be used for the measuring tube of the mass flow meter? Is Hastelloy B okay? Also: Are there measurement tubes lined with PTFE?
One should inquire with the manufacturer of the mass flow meter to see if it is possible to have a measuring tube made of Monel alloy on special order. In the measurement using a mass flow meter, it is necessary to oscillate the flow tube; the use of lined tubes affects the measurement accuracy, and long-term high-frequency oscillations may cause the lining to separate from or even fall off the tube wall. Therefore, the use of lined tubes is not recommended.
Emerson has a mass flow meter with PTFE lining