PRESSURE GAUGE HAVING ZERO CORRECTION FUNCTION AND ZERO CORRECTION METHOD

摘要

To provide a pressure gauge and a zero correction method having a zero correction function capable of zero correction at any timing without relying on an external system.SOLUTION: A pressure gauge 1 has a pressure sensor 2 and measures pressure by a diaphragm 3 responsive to a flow of the subject fluid. On the rear surface of the pressure gauge 1, there is provided a connecting terminal 4and a connecting terminal 4- which guides the subject fluid to the pressure sensor 2, a connecting terminal 4and the pressure sensor 2 is connected via a control mechanism 7 in the first flow path 5, and the first flow path 5is connected to the terminal 4and the pressure sensor 2 via the control mechanism 7. Further, the control mechanism 7 has a second flow path 6 that connects the first flow path 5and the first flow path 5-. By interrupting the inflow of the subject fluid from the system flow path and conducting it to the second flow path 6 and the pressure sensor 2, it is possible to measure the pressure in the equilibrium state (theoretically, zero), the difference between the measured value and the zero value is used to perform the zero correction.SELECTED DRAWING: Figure 1