A high gas pressure calibration system using a liquid-lubricated pressure balance

We developed a high gas pressure calibration system that uses a liquid-lubricated (LL) pressure balance as a standard for pressures up to 100 MPa. The LL pressure balance can generate gas or hydraulic pressure by changing the pressure medium. We first evaluate characteristics of the LL piston-cylinder (PC), such as its effective area and fall rate. The effective area of the LL PC is evaluated through comparison with a hydraulic pressure balance. When the LL PC uses a gas, the fall rate is affected by gas dissolution into liquid in the LL PC reservoir. The results of calibrating a pressure gauge under the developed system are consistent with those by an existing hydraulic pressure calibration system.