Patent ID: 8713993
Filing Date: 2014-05-06
Classification: G01M

Abstract:
1. A pinhole inspection apparatus, comprising a gas supply line supplying a predetermined amount of gas into a bottle, a pressure detection line for measuring an inner pressure of the bottle, a branch line provided at an intermediate location of the gas supply line or the pressure detection line of the bottle, and an orifice serving as a pseudo pinhole connected to the branch line via a valve, wherein the pinhole inspection apparatus determines a reduction of the inner pressure of the bottle after a mouth of the bottle is sealed and a fixed time has elapsed, wherein the orifice is provided with a variable hole diameter, and wherein the pressure detection line measures an inner pressure of the bottle as a reference inner pressure immediately after sealing the gas, and the pinhole inspection apparatus determines the bottle to be free of a pinhole and acceptable only in a case where the reference inner pressure exceeds a predetermined first threshold value and the pressure reduction quantity does not exceed a predetermined second threshold value.