Process analysis instrument for measuring gas composition. In many production processes, especially in the presence of chemical reactions, automatic control based solely on physical parameters such as temperature, pressure, flow, etc. is often insufficient. Due to the wide variety of gases being analyzed and the variety of analytical principles, there are many types of gas analyzers. Commonly used are thermal conductivity gas analyzers, electrochemical gas analyzers and infrared absorption analyzers.
principle
Gas sensors are mainly used to detect the types of gases present in the environment, and gas sensors are sensors for detecting the composition and content of gases. It is generally believed that the definition of a gas sensor is based on the classification of the detection target, that is, the sensor used to detect the composition and concentration of the gas is called a gas sensor, whether it is a physical method or a chemical method. For example, sensors that detect gas flow are not considered gas sensors, but thermal conductivity gas analyzers are important gas sensors, although they sometimes use a generally consistent detection principle.
Folding thermal conductivity
A physical type of gas analysis instrument. It estimates the content of some of these components by measuring the thermal conductivity of the mixed gas based on the principle that different gases have different thermal conductivity. This kind of analytical instrument is simple and reliable, and it has a variety of applicable gases. It is a basic analytical instrument. However, it is difficult to directly measure the thermal conductivity of a gas, so in practice, the change in the thermal conductivity of the gas is often converted into a change in resistance, which is then measured by a bridge. The thermal element of the thermal conductivity gas analyzer mainly has two types of semiconductor sensitive components and metal resistance wires. The semiconductor sensitive component has small volume, small thermal inertia, and large temperature coefficient of resistance, so the sensitivity is high and the time lag is small. A bead-shaped metal oxide is sintered on the platinum coil as a sensitive element, and a material that does not react to the gas is wound around the same platinum coil having the same internal resistance and heat generation as a compensating element. These two components form a bridge circuit as two arms, which is a measurement loop. When the semiconductor metal oxide sensitive element adsorbs the gas to be measured, the electrical conductivity and thermal conductivity change, and the heat dissipation state of the element also changes. The change in the temperature of the component changes the resistance of the platinum coil, and the bridge has an unbalanced voltage output, from which the concentration of the gas can be detected. Thermal conductivity gas analyzers are used in a wide range of applications, in addition to the usual analysis of hydrogen, ammonia, carbon dioxide, sulfur dioxide and low concentrations of flammable gases, as well as detectors in chromatographic analyzers for the analysis of other components.
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