초록 ▼

A method and apparatus for leak testing a hollow body wherein the hollow body is placed in a test chamber. A prechamber is brought to a desired pressure, then connected with the test chamber. The pressure in the test chamber is stored at a certain point in time on an input side of a differential pre

A method and apparatus for leak testing a hollow body wherein the hollow body is placed in a test chamber. A prechamber is brought to a desired pressure, then connected with the test chamber. The pressure in the test chamber is stored at a certain point in time on an input side of a differential pressure sensor and then the course of the test chamber pressure is compared with reference pressure thus formed. Any pressure compensation which occurs if leaks are present in the hollow body is recorded as an indication of such leakage.

대표청구항 ▼

A process for at least one of testing tightness of a hollow body and change in a volume of the hollow body caused by pressure stress applied to walls of the hollow body, the method comprising the steps of: placing said hollow body in a test chamber; exposing said hollow body to one of a positive or

A process for at least one of testing tightness of a hollow body and change in a volume of the hollow body caused by pressure stress applied to walls of the hollow body, the method comprising the steps of: placing said hollow body in a test chamber; exposing said hollow body to one of a positive or negative differential pressure between an internal pressure of the hollow body and a pressure in the test chamber; connecting the test chamber to two differential inputs of a differential pressure sensor; interrupting the connection to one of the differential inputs at a predetermined position of a connecting line of one of said inputs to said test chamber thereby selecting said position so that a volume of a section of said connecting line between said position and said one input is considerably less than the volume of said test chamber and forming a reference pressure system by said section of said connecting line to hold pressure at said one input at a level assumed at the moment of interrupting; monitoring a behavior of a pressure at the other of said two differential inputs with respect to the pressure at said one input; and determining at least one of the tightness and change in volume of the hollow body from an output signal of said differential pressure sensor.