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This article discloses a capacitive sensing tool for continuously monitoring hydrochloric acid concentrations in an oxidation gas passing through the tube.
English (United States)
This text was extracted from a PDF file.
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Hydrochloric Acid Monitoring Device
This article discloses a capacitive sensing tool for continuously monitoring
hydrochloric acid concentrations in an oxidation gas passing through the tube.
A pair of curved capacitive plates are rigidly affixed around the outside of the
tube carrying the gas flow that is to be monitored. The probe is attached to a
highly accurate capacitance meter or bridge and measures the permittivity of the
gas flowing through the tube which changes as a function of the amount of
hydrochloric vapor being carried in the oxygen gas. The instrument is calibrated
by first measuring the capacitance with 100 percent oxygen in the tube, then
measuring the capacitance with 100 percent hydrochloric acid in the tube, and
finally measuring the capacitance with various known percentage combinations
of hydrochloric acid carried in the oxygen within the tube.