| 摘要 |
PROBLEM TO BE SOLVED: To make a pressure detector easily correctable with respect to the atmospheric pressure. SOLUTION: A signal for opening a pressure applied to a pressure detector 1 to the atmospheric pressure may be outputted for atmospheric pressure correction. The signal may be outputted by pressing as switch (not shown in the figure), etc., provided to an operation panel of the pressure detector 1. Thus, an electromagnetic valve 9 is attracted to open the pressure applied to the pressure detector 1 to the atmospheric pressure based on the output signal, and is set to an atmospheric pressure open position. At this position, an intermediate part of a pressure piping 8 communicates with the outside of the pressure piping 8 by a diagonal through hole 11 formed at the electromagnetic valve 9, and the pressure applied to the pressure detector 1 is opened to the atmospheric pressure. Then, a microcomputer 4 judges an input voltage from a current amplifying circuit part 3 to be corresponding to a prescribed reference display value (for example, 0 kPa), and a pressure display value, when the pressure applied to the pressure detector 1 is opened to the atmospheric pressure, is automatically corrected into a prescribed reference display value (for example, 0 kPa).
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