Photoelectric bubble meter for checking gastight containers and the like

Claim 1

A photoelectric bubble meter for checking gastight containers and interception devices in general, comprising: a. a transparent jar containing a liquid and having an inflow tube dipping below the surface of said liquid in the jar, and an outflow tube above the surface of said liquid; b. a projector placed at one side of said jar and outSide it which is adapted to transmit a horizontal beam of light towards the lower end of said tube dipping into said liquid in said jar; c. a photocell positioned on the other side of said jar diametrically opposed to said projector and adapted to reveal the eventual bubbles originated by leaks in the tested container and issuing from said dipping tube; d. an impulse counting device adapted to count the impulses coming from said photocell following the emission of said bubbles from said tube dipping in said liquid, said dipping tube being connected to the container or interception device to be tested; and e. a differential pressure system, inserted between the container to be tested and said jar, and consisting of: a first electrovalve for the introduction of compressed air and connected by tubing on one side with the container to be tested and a second electrovalve, and on the other side with said outflow tube from said jar; and auxiliary storage tank connected on one side to said tube dipping into said liquid in said jar and on the other side to said second electrovalve; and a blind-end tank connected to said second electrovalve, said tank being adapted to eliminate the capillary effect of said tube dipping into said liquid in said jar.