Pressure monitor used within the cavity to be monitored

Abstract

A pressure sensor in a pressure container is introduced to detect pressure difference by comparing an unknown internal pressure with a predetermined pressure of an air-tight chamber. Upon the existence of the pressure difference, a signal to show whether the inside pressure is higher or lower than the predetermined one can be provided for taking further relative measures. The pressure sensor is characterized on that: an air chamber is located at the bottom of the pressure sensor for providing thereinside an air-tight chamber, a press button provided on top of the air-tight chamber is contacted thereabove with a pressure membrane and therebelow with a spring, the pressure membrane is supported by an air-tight cushion at the bottom thereof and further connected with a protrusion of the shaft at the top thereof, the shaft is facilitated with electric conductive points both inside and outside which connect further with electrodes of a base plates, and an air hole of the base plate is included to introduce the interior pressure of the container for pressure comparison with the predetermined pressure.

Dependencies are inferred from the claim text.