| 摘要 |
PROBLEM TO BE SOLVED: To enable to restrain infiltration of rainwater or the like into a back-pressure chamber from outside while securing ventilation of the back-pressure chamber in a pressure switch and to make it hard to suffer from influence of outer environments. SOLUTION: The pressure switch is provided with a hollow metal case 3, a hollow resin terminal block 5 with one end coupled with the case 3 and the other end fitted with a terminal plate 43, a diaphragm 7 arranged in the case 3 and zoning the inside of case 3 into a pressure-receiving chamber 51 at a side opposite to the terminal block 5 and the back-pressure chamber 53 at the terminal block 5 side, and an air passage 81 fitted at the terminal block 5 side and communicating the back-pressure chamber 53 with the outside. A selective permeating filter 2 capable of sealing water in an air permeable state is made intercalated at the air passage 81 in the terminal block 5 side. COPYRIGHT: (C)2005,JPO&NCIPI
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