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Thermal Conductivity Gas Analyzer is a Physical Gas Analyzer

It is based on the principle that different gases have different thermal conductivity, and calculates the content of certain components by measuring the thermal conductivity of the mixed gas.

This kind of analysis instrument is simple and reliable, and it is suitable for many kinds of gases, and it is a basic analysis instrument. However, it is difficult to directly measure the thermal conductivity of gas, so in fact, the transformation of the thermal conductivity of the gas is often converted into the transformation of resistance, and then measured with a bridge.

The thermally sensitive components of the thermal conductivity gas analyzer mainly include semiconductor sensitive components and metal resistance wires. Semiconductor sensitive parts have small size, small thermal inertia, and large temperature coefficient of resistance, so they have high sensitivity and small time lag. A bead-shaped metal oxide is sintered on the platinum coil as a sensitive component, and then the same platinum coil with the same internal resistance and heating value is wound with a gas non-reactive material as a compensation component. The two components are used as two arms to form a bridge circuit, which is a measurement loop. When the semiconductor metal oxide sensitive component absorbs the measured gas, the electrical conductivity and thermal conductivity will change, and the heat dissipation state of the component will change accordingly.

The temperature change of the component changes the resistance of the platinum coil, and the bridge has an unbalanced voltage output, based on which the gas concentration can be detected.

The thermal conductivity gas analyzer has a wide range of applications. In addition to the analysis of hydrogen, ammonia, carbon dioxide, sulfur dioxide and low-concentration flammable gas content, it can also be used as a detector in a chromatographic analyzer to analyze other components.

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