How does the gas detector technology work?
2020-09-24
Today for us to introduce the gas detector technology principle. Now the gas detector in general there are five kinds of skills, respectively, electrochemical skills, catalytic incineration skills, PID skills (photoelectric ionisation skills), infrared skills, semiconductor skills. What is the working principle of the gas detector sensor? The following for us to sort out the introduction.
Electrochemical technology principle sensor
Principle: the use of the active chemical properties of the gas to be measured, with restorative or oxidative, in the process of participating in the chemical reaction of the release or absorption of electrons, many electrons constitute the current, the current size and the gas concentration is proportional to the measurement of the current size can be measured to be measured gas concentration.
Advantages: more stable function, the vast majority of toxic and harmful gases can be measured by electrochemical sensors, measurement linearity is very good.
Life expectancy of 1-2 years, 3-6 months in harsh environments need to be replaced, protection costs are relatively high.
Sensor photoionisation detector
ppb level other VOC, reactive, fast response time, can measure most VOC.
3-5 years, small amount of late protection.
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