Device for checking the functioning of gas measuring apparatus

US4287750A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Wolfgang Eckstein · Sereetz, DE
• Horst Rabenecker · Stockelsdorf, DE

Key dates

• Filing date: Oct 4, 1979
• Grant date: Sep 8, 1981
• Expiry date: Oct 4, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L7/086
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for checking the functioning of a gas measuring apparatus which includes a tubular connection for the passage of a gas so that it can be directed through a tube mounted in the connection which has means therein such as a chemical for measuring the gas which is passing therethrough. The device comprises a translucent diffusing screen mounted on the tubular connection so as to be able to view through the screen and into the gas passage and a spring diaphragm connected to the tube having a side disposed in space relationship to the screen and viewable through the screen and gas between the screen and the diaphragm when the diaphragm is flexed in one direction in respect to the screen so as to position it closer to the screen. The diaphragm is also flexed by a pressure variation within the tube and on the exterior of the diaphragm, for example when the pressure conditions within the tube are not as to be expected for normal functioning so as to move the diaphragm in an opposite direction away from the screen and to render the diaphragm invisible when viewed through the screen and the gas. The diaphragm is advantageously made of a distinct color so that its appearance or disapp…