What is the principle of the Winfoss SF6 Quantitative Leak detector (Winfoss- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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What is the principle of the Winfoss SF6 Quantitative Leak detector (Winfoss-C1)?

发布时间：2016-01-13 来源：ydlcb 浏览次数：40次

A: SF6 quantitative leak detector (Winfoss-C1) adopts the principle of high frequency ionization measurement: When the air contains different concentrations of sulfur hexafluoride gas or various halogen gases, the degree of ionization under the action of high frequency electromagnetic field is different.

The instrument consists of a probe and a pump body. The high-frequency electric field electrode on both sides of the instrument's gas ionization chamber and the high-frequency oscillation coil form the resonant circuit and energy output circuit of the high-frequency oscillator. The needle valve of the probe can adjust the intake volume to match the pumping rate of the pump so as to maintain a certain vacuum degree in the gas ionization chamber, so that the measured gas is under the action of a low energy high-frequency electromagnetic field. It has sufficient ionization. The high frequency electric and magnetic fields produced by the high frequency coil act on the rarefied gas in the ionization chamber, resulting in high frequency electrodeless ionization.

When the air passing through the ionization chamber does not contain sulfur hexafluoride or halogen gas, the cavity absorbs the energy given by the high-frequency electric and magnetic fields, resulting in a significant decrease in the Q value in the resonant loop, and at the same time, the oscillation amplitude of the high-frequency oscillator is greatly reduced. However, when the air contains negative gases such as sulfur hexafluoride or halogen gas, because sulfur hexafluoride and halogen gas are electron trapping gases, A large number of free electrons can be captured in the ionization chamber, so that the ionization degree in the ionization chamber is weakened, the oscillation amplitude of the oscillator is increased, and the rising amplitude is proportional to the negative electric gas concentration of the measured gas, so that the signal is converted into a concentration indication through the signal amplifier. Therefore, the measuring range of the instrument is wide, the stability is good, the corresponding speed is fast, the sensitivity is high, and the probe will not be poisoned.