Design and application of high-temperature-withstanding high pressure transducer

A new type of high temperature withstanding high pressure transducer is described. The transducer uses Manganin wire as sensing-element and can measure pressure up to 250 MPa under condition of high temperature up to 200°C for a long time. The expanded uncertainty in measurement of the transducer is less than 1.0% verified by calibration and practical use. This paper discusses the key technology issues, such as high pressure sealing and linearity correction under the temperature range from 0°C to 200°C, etc. The calibration test under high temperature condition is carried out against a free piston gauge having an uncertainty of 0.1%. Measured results in practical use on high-pressure cauldrons for growing man-made crystals are given