Safe methane gas conc. measurement device - uses chamber with stub sensor and gas tight screw connector projecting into pipe

摘要

An intrinsically safe device for measuring methane conc. in gas extraction and gathering pipes, e.g. in mining applications, enables direct delay-free continuous measurement and is simple to construct. A conventional measurement chamber (1) is connected to an evaluation unit via an electrical measurement conductor (16). It is also connected via a gas tight screw connector to a cylindrical stub pipe (6) projecting into the gas pipe (4) into which it is screwed. The stub pipe is sealed at its lower end, has peripheral borings (7) near the end which incline upwards, and contains a baffle (8).