Temperature controlled transfer standard package for high accuracy pressure transducers with improved temperature stability

Abstract

A new temperature controlled transfer standard package for absolute and differential pressure transducers has been developed at the Ulusal Metroloji Enstitusu (UME). Due to direct (metal-metal) touching of the temperature controlled plate of the temperature controlled unit with the pressure sensor housing the temperature influence of electronics on the pressure sensor is ruled out. The pressure sensor temperature inside of cast aluminum housing can be controlled at any fixed temperature in the temperature range of 15 °C − 30 °C with stability ± 2 mK. The mentioned transfer standard package minimizes the ambient temperature effects upon the sensor, denies the need to apply a correction for thermal transpiration effect and thereby increases accuracy of the transducer. The transfer standard packages have demonstrated excellent short-term zero stability which does not exceed ± 5 mPa and a maximum drift rate of 0.03 mPa h−1.