| 摘要 |
The circuit of the device for regulating the pressure of a fluid, especially a compressed standard gas, includes at least one first and one second branch-off (10, 12), the first branch-off (10) comprising a first downwards-only inflatable receptacle (16) delimited by an undeformable upper wall (18) and a deformable lower wall (20), the said lower wall (20) being able to hang under gravity, the second branch-off (12) comprising a second upwards-only inflatable receptacle (22) delimited by an undeformable lower wall (24) and a deformable upper wall (26), the surface areas and weights of the said deformable walls (20, 26) being equal, and the said deformable walls (20, 26) being subjected to an outside pressure equal to the said predetermined pressure. Application to the calibration of gas analysers used to measure the pollution of environmental air. <IMAGE> |
