1. Description

MQ-E3-CO is the sensor of fixed potential electrolysis type. By redox reaction, CO and O₂release charge and form the current. The value of current is proportional to the concentration of CO, and follow the Faraday’s Law. By testing the value of current, the concentration of CO is known.

2. Appearance and dimension

3. Technical specifications

4.Basic Circuit

5.Test Circuit

6.Sensor Characterization

7.Precautions

 Soldering is prohibited during installation;

 Aging time should be no less than 48 hours before use;

 Pins must not be broken or bent;

 Electrolyte leakage may cause damage, please do not disassemble the sensor at will;

 Avoid contact with organic solvents (including silicone rubber and other adhesives), coatings, pharmaceuticals, fuel oils and high-concentration gases;

 All electrochemical sensors cannot be completely encapsulated with resin materials, nor can they be immersed in an oxygen-free environment, otherwise the performance of the sensor will be damaged;

 All electrochemical sensors cannot be used in environments containing corrosive gases, which can damage the sensor;

 When measuring the zero point of gas, it must be done in a clean atmosphere;

 When testing and applying the sensor, vertical air intake from the front must be avoided;

 The air intake surface of the sensor must not be blocked or contaminated;

 The waterproof and breathable membrane above the sensor must not be uncovered or damaged;

 It is slow to recover to the initial state after long-term use in a high-concentration gas environment;

 The working electrode and the reference electrode should be in a short-circuit state when the sensor is stored;

 It is forbidden to use hot melt adhesive or sealant with a curing temperature higher than 80℃ to encapsulate the sensor;

 It is forbidden to store and use it in high concentration alkaline gas for a long time;

 The sensor cannot be subjected to excessive impact or vibration;

 Do not use it if the shell is damaged.