How to use sampling cylinders correctly?

When using sampling cylinders, the following steps should be followed: a. Prepare the required sampling cylinders, relevant sampling equipment, and gas samples; b. Confirm that the sealing of the cylinder is good, and then connect the sampling equipment to the cylinder as required; c. Select an appropriate sampling method based on the amount of gas to be collected, such as direct sampling or sampling; d. After the collection is completed, the steel cylinder should be sealed and labeled in a timely manner, indicating the sampling time, location, gas type, and other information; e. Conduct subsequent processing and analysis of the collected gas samples.