Abstract
A design is described for a device which transmits steady-state differential pressure from a liquid process to a gas differential pressure signal. By appropriate design, the hydrostatic error inherent in liquid-to-gas pressure transmission can be made negligibly small in relation to the accuracy of the differential pressure transducer. The instrument is a design modification of the “gas trap” method of pressure measurement for liquid-metal systems. The design described results in a simple, inexpensive, and easy to implement technique for liquid-metal differential pressure measurement, and, by appropriate design, with a negligible hydrostatic error. The design and implementation of such a system was undertaken with highly satisfactory results. Operational aspects of such a system are described. The design is applicable to a system where highly accurate steady-state differential pressure measurements are needed, while avoiding introduction of the process directly within the differential pressure transducer.
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