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Analysis Principle of Thermal Conductivity Gas Analyzer

The thermal conductivity gas analyzer is based on an analysis principle called the name, and generally can analyze the concentration of hydrogen and argon.

The instrument works based on the physical principles of different gas components with different thermal conductivity conditions. The platinum wire is used as the sensitive element to form an unbalanced bridge, and the output signal size corresponds to the volume percentage of the gas to be measured, and then the signal is amplified, filtered, linearized, corrected, and standard signal output is subjected to electrical processing, * Then output the standard current or voltage signal proportional to the measured gas concentration.


Thermal conductivity analyzers are generally used to measure gases with very strong thermal conductivity, such as H2 and HE.

The work of the detector is based on the principle of Wheatstone bridge balance, which has been taught in general middle schools.

The four arms of the bridge automatically maintain current balance, and the same heating wires are installed on these four arms. Two of the arms are used as reference ends, and the heating wire above is generally sealed in an inert gas to generate heat stably, and the current through which the resistance value is constant does not change.

The other two arms are used as the measuring end to pass the gas to be measured. Due to the difference in gas concentration, the amount of heat taken away from the heating wire is also different. The change of the heating wire heat causes the resistance value to change, and the current of the electric bridge also changes accordingly.

By comparing the deviation of the current at the reference terminal and the current at the measuring terminal, the corresponding concentration of the measured gas can be obtained.

Application fields: Thermal conductivity analyzer is suitable for thermal power plants, fertilizer plants, petrochemicals, oil refineries, etc.

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