| 摘要 |
PURPOSE:To detect a leaked fluid easily, by changing electrostatic capacity by quantity corresponding to the difference between relative dielectric constants of air and the fluid when the internal fluid is leaked from machinery and the gap between capacitor electrodes is filled with said fluid. CONSTITUTION:When leakage was generated in the vicinity of the welded joint part 6 of piping 1, water leaked from the piping 1 is penetrated in a liquid permeable insulating member 11. The capacity C(F) of a capacitor constituted of a detection electrode 7, the member 11 and the piping 1 can be shown by the formula when dielectric constant is set to epsilon0, relative dielectric constant to K, the area of electrodes to S and the distance between electrodes to d. As a result, if the area S, the distance d and the dielectric constant epsilon0 are constant, the capacity of the capacitor is determined by the relative dielectric constant K of the substance filling the space between electrodes. If the substance between electrodes changes from air to water, the capacity C increase up to 80 times and the change in the capacity can be detected easily.
|
