| 摘要 |
Apparatus for providing a calibrated gas pressure comprising a piston mounted within a cylinder, there being provided a gap between adjacent walls of the piston and cylinder, the cylinder being generally closed at one end so as to provide a closed chamber, the closed chamber including an outlet for gas at a calibrated pressure and a variable outlet valve, a gas inlet being provided in the wall of the cylinder adjacent to the position of the piston, and the piston including means for engagement with a force measuring means, whereby gas, in use, is supplied to the gas inlet and passes to the chamber to provide a calibrated gas pressure within the chamber, the pressure being measured by means of the force measuring apparatus. |
