Differential pressure gauge for gas confined in circuit breaker - has reference chamber housing magnetic plug with cones engaging inlet holes while pressure sensor inside chamber is connected to exterior alarm

摘要

The pressure gauge includes a reference chamber(2) placed inside an envelope(1) of a circuit breaker. The chamber walls are fixed with screws. One of the walls presents two holes(3). The chamber houses a magnetic plug(4) compressed by a spring(6). The plug presents two elastic cones(8) which close the two holes. An exterior magnetic tool(5) cooperating with a positioning tenon actuates the plug opening the access holes to let gas in. A differential pressure sensor(11) is fixed on the chamber wall and connected to an alarm. USE/ADVANTAGE - For circuit breakers to signal gas leaks. Is simple and reduces errors due to temperature variations. Reference chamber can be filled with gas without physical contact.