Momoko Kojima

Development of small differential pressure standard using double pressure balances

A calibration system for small differential pressure standards has been developed. The standard is realized by a pair of pressure balances, which generate a differential pressure of 1?Pa to 10?kPa at a line pressure of 100?kPa ? 10?kPa. The performance of the calibration system has been evaluated by calibrating several pressure transducers and positive long-term stability has been observed for each transducer for over a year. The standard deviation measured during the period was about 8?mPa in the pressure range 1?Pa to 1?kPa. These results indicate that the system has sufficient performance to calibrate high accuracy pressure transducers. The details of the system and the performance evaluation are described.