Patent ID: 7891242
Filing Date: 2011-02-22
Classification: G01C,H01H

Abstract:
1. A sensing device comprising: a container having a fixing element and at least two pairs of electrodes; a liquid dielectric contained by said container and used to trigger said electrodes in said container and switch conduction states of a circuit; a bottom electrode arranged at bottom of said container and used to detect leakage of said liquid dielectric; a buffer necking part located inside said container, arranged along a perimeter of the bottom of said fixing element and used to prevent said liquid dielectric from contacting said electrodes; a precision valve arranged in said container, penetrating said fixing element with a part thereof emerging from said fixing element and used to adjust level of said liquid dielectric, wherein a high level results in a high sensitivity, and a low level results in a low sensitivity; and a leakage-proof detection device enveloping said container, said liquid dielectric, said buffer necking part and said precision valve and used to detect leakage of said liquid dielectric and prevent from leakage of said liquid dielectric.