A physical gas analysis instrument. 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 infrared gas analyzer is simple and reliable, and it is suitable for many types of gases. It is a basic analytical instrument. However, it is difficult to directly measure the thermal conductivity of gas, so in fact, the change in thermal conductivity of gas is often converted into a change in resistance, and then measured with a bridge. The thermal elements of thermal conductivity infrared gas analyzers mainly include semiconductor sensitive elements and metal resistance wires. Semiconductor sensitive components 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 element, and then the same platinum coil with the same internal resistance and heating value is wound with a material that does not react to gas as a compensation element.
These two elements constitute a bridge circuit as two arms, that is, a measurement loop. When the semiconductor metal oxide sensor absorbs the measured gas, the electrical conductivity and thermal conductivity change, and the heat dissipation state of the element also changes. The temperature change of the element changes the resistance of the platinum coil, and the bridge has an unbalanced voltage output, which can detect the gas concentration. 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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