| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure, with a simple constitution, a flow velocity and a pressure (static pressure) of a flow in a non-steady state in which a pressure wave, a turbulent flow, or the like is generated. SOLUTION: The piping network monitoring system is constituted so that the flow rate can be precisely measured over a flow velocity region lower than the minimum measurable flow velocity region by a general Pitot tube, by measuring a velocity value of a fluid by a bi-pressure tube 1. According to such a bi-pressure tube 1, because the velocity of the flow having both normal and reverse directions can be symmetrically measured, even when the reverse flow is generated in the fluid to the measured, the reverse flow can be also precisely measured. By measuring the velocity value to obtain a static pressure measuring value of the fluid on the basis of an output from a static pressure sensor 4, both of the flow velocity measuring value and the static pressure measuring value can be measured in real time. COPYRIGHT: (C)2004,JPO
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