The principle of the thermal magnetic oxygen analyzer utilizes the paramagnetic characteristics of oxygen. A substance can be induced and magnetized under the action of an external magnetic field. The magnetic susceptibility is used to indicate the difference in the degree of magnetization of different substances. It has been found in experiments that a gas with a positive magnetic susceptibility is attracted by a magnetic force in a magnetic field and is called a paramagnetic gas. Oxygen is a paramagnetic gas. Generally, the magnetic susceptibility of paramagnetic gas is small, and the magnetic susceptibility of oxygen is orders of magnitude higher than that of most gases. The formula of the magnetic susceptibility of mixed gas can be approximately expressed as ―magnetic susceptibility of mixed gas ― magnetic susceptibility of oxygen ― magnetic susceptibility of other trace components ― oxygen It can be seen from the concentration that the magnetic susceptibility of the mixed gas is linearly related to the concentration of oxygen.
There is also-gas susceptibility-Curie constant-gas constant-gas pressure-molecular weight can be seen, the gas susceptibility is inversely proportional to the temperature.
Thermomagnetic oxygen analyzer is to use the above characteristics to measure the magnetic susceptibility, and then determine the oxygen content in the mixed gas.
The thermal magnetic oxygen analyzer consists of a transmitter and an enlarged display. The transmitter is an annular gas chamber with a channel in the middle. The platinum resistance is evenly wound on the outside of the middle channel, and the middle tap of the winding is evenly divided into equal resistances. They form a bridge with the resistances. If there is no external magnetic field, the measured gas is discharged from the annular chambers on both sides, and no gas flows through the intermediate channel. After a magnetic field is applied, the paramagnetic gas (oxygen) in the sample gas is attracted to the magnetic field. Due to the heating of the hot wire, the magnetic susceptibility of the oxygen is reduced, and the magnetic field force received is smaller than the original position. The cold wind then pushes the hot wind, forming a magnetic wind in the middle channel. That is thermal magnetic convection.
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