Detection refers to the use of a standard gas or a gas sample of known concentration to test the performance of an instrument. Testing can be categorized into open-circuit and closed-circuit testing. An open-circuit test is a test performed without the instrument coming into contact with the gas under test and is used to test the sensitivity and response time of the instrument. A closed-circuit test is a test performed when the instrument is in contact with the gas being measured and is used to test the accuracy and stability of the instrument.

When performing testing and calibration, the following points need to be noted: 1. use the correct standard gas and gas samples; 2. operate the instrument according to its operating instructions; 3. follow the safety operating procedures to avoid hazards to personnel and the environment; and 4. perform testing and calibration on a regular basis to ensure the accuracy and reliability of the instrument.

1. Avoid using in high temperature, strong magnetic field, strong electric field and other environments.

2. Avoid direct contact with strong acids, strong alkalis and other chemicals.

3. Clean the instrument regularly to prevent contamination and clogging

4. Replace filters and sensors regularly to ensure the accuracy and reliability of the instrument.

5. comply with local regulations and standards to ensure the correct use and safety of the instrument.