Gas sensor-Ozone is widely distributed on the earth, mainly in the lower stratospheric ozone layer 20-35 kilometers away from the earth's surface. It is an allotrope of oxygen, has a special smell, and is light blue at room temperature. It is also a strong disinfectant and oxidant. The sterilization and utilization of ozone in life can better protect human health. Because the environmental pollution is serious now, everyone has begun to attach importance to disinfection and sterilization in daily life. The ozone o3 sensor is used in more and more places, so how to choose the ozone o3 sensor?
Stability refers to the stability of the basic response of the ozone o3 sensor during the entire working time, which depends on the zero drift and interval drift. Zero drift refers to the change in sensor output response during the entire working time without ozone. Interval drift refers to the change in the output response of the ozone o3 sensor continuously exposed to ozone. Indicating that the output signal of the sensor decreases during working hours. Ideally, the ozone o3 sensor has a zero drift of less than 10% per year under continuous working conditions.
Sensitivity refers to the ratio of the output change of the ozone o3 sensor to the measured input change, and it mainly depends on the technology used in the sensor structure. The design principles of most gas sensors are biochemistry and electrochemistry as well as physics and optics. The first consideration is to choose a sensitive technology that can detect the percentage of the valve limit and the lowest explosive limit of the target gas.
Selectivity is also called cross-sensitivity. It can be determined by measuring the sensor response produced by a specific concentration of interfering gas. This response is equivalent to the sensor response produced by a certain concentration of ozone. This feature is very important in the application, because the cross-sensitivity will reduce the repeatability and reliability of the measurement, so the ideal ozone o3 sensor should have high sensitivity and high selectivity.
Corrosion resistance refers to the ability of the ozone o3 sensor to be exposed to a high volume fraction of target gas. When a large amount of gas leaks, the probe of the ozone sensor should be able to withstand 10-20 times the expected gas volume fraction. Under normal working conditions, the drift and zero correction value of the ozone sensor should be as small as possible.