What are the calibration methods of electrochemical gas sensor?

　　As a gas sensor with high application frequency in industry, it is also a popular kind of gas sensor -- electrochemical gas sensor, which can react through the measured gas and generate electrical signals proportional to the gas concentration. The gas sensor is usually composed of a sensor electrode and a reverse electrode, and is separated by a thin electrolyte layer. Next, let's understand the calibration method of electrochemical gas sensor. Let's understand it.

　　When calibrating electrochemical gas sensor, standard gas calibration method and vapor calibration method are usually used. The calibration effect of these two methods is relatively good in actual use.

　　一、Standard gas calibration method

　　It is usually mainly used for calibration of common gases, such as CO, H2S, NH3, Cl2, etc

　　Operation steps:

　　1. Find or purchase appropriate concentration of air sources.

　　2. the pressure reducing valve is installed on the air source to provide pressure reduction control function.

　　3. connect the good air road, PTFE tube on both sides of the use of short rubber tube connection.

　　4. Connect the flowmeter on the other side of the gas path.

　　5. Install the gas hood of the corresponding size of the sensor on the flowmeter.

　　6. Open the cylinder air valve, adjust the flow rate, and start calibration after 5min of ventilation.

　　二、Vapor calibration method

　　CO and other gas is more common, usually in the form of gas, but because most organic matter is in the form of liquid, easy to liquify, so organic gas is not common, standard gas error is relatively large, so the more simple calibration method is vapor calibration. That is, liquid evaporation is selected to manipulate the concentration of the evaporating gas, so as to complete the calibration of the sensor or the whole machine.

　　Operation steps:

　　1, put the whole machine into the weather with heating plate;

　　2,Use microinjection to extract the corresponding volume of reagent;

　　3, the reagent is injected into the heating plate in the weather, heating evaporation, complete the calibration.

　　Electrochemical gas sensor is an important gas sensor in a very wide range of industrial applications, and when using this kind of gas sensor, it is important to master the relevant sensor calibration method, so that the electrochemical gas sensor can give full play to its advantages.