To provide a switch which can be simplified in structure, can avoid the increase of its size even when the number of circuits to be switched is increased, and can operate according to the physical quantity of a fluid.
A switch measures the pressure value of a fluid by means of a pressure sensor 34 and a signal processing board 35 and switches external wiring connected to a terminal block 25. Since a switching control section 355 which outputs an electric switching signal in accordance with the measured pressure value and a plurality of electronic switches 356 and 357 which perform switching operations by using the switching signal of the control section 355 are used, the parts from the sensor 34 to the control section 355 can be shared with the switches 356 and 357 and the structure of the switch can be simplified. Even when the number of circuits to be switched is increased, the size increase of the switch can be avoided, because the number can be increased by only increasing the number of the electronic switches 356 and 357.
KOJIMA KATSUHIKO
KARITA MASANORI
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