| 摘要 |
<p>PCT No. PCT/FR80/00094 Sec. 371 Date Feb. 17, 1981 Sec. 102(e) Date Feb. 17, 1981 PCT Filed Jun. 13, 1980 PCT Pub. No. WO80/02874 PCT Pub. Date Dec. 24, 1980.An apparatus for measuring the fluid flowrate through a system whose through flowrate is to be measured, which includes a first chamber in fluid communication and substantial pressure equilibrium with a constant pressure source, a second chamber in fluid communication with the constant pressure source through a flow restrictor whose through flowrate is substantially equal to the through flowrate of the system to be measured, a valve having an upstream port in fluid communication with the second chamber and a downstream port adapted to receive and connect with the system to be measured, the valve being selectively actuable to establish or block fluid communication between the second chamber and the system to be measured, and a measuring device for measuring the pressure difference between the first and second chambers.</p> |
