A thermal conductivity detector having a multi-layer sensing element, a gas sensor, and a method of gas sensing

摘要

A thermal conductivity detector is disclosed, for use in gas sensing and comprising an elongate multi-layered sensing element, said sensing element comprising an outer layer and an inner layer, the outer layer having a higher resistivity than the inner layer and a lower temperature coefficient of resistance than the inner layer. A gas sensor incorporating such a thermal conductivity detector is also disclosed, as is a method of gas sensing using such a detector.