คุณลักษณะ

• Put the dry ice-acetone solution into the inner tube of the central trap of the apparatus, introduce the sample gas from the nozzle at the lower part of the apparatus, and extract the dried gas from the upper nozzle.
• Moisture in the sample gas freezes and sticks to the outside of the trap.
• It is placed between the experimental equipment and the vacuum pump to prevent moisture and paper from entering the vacuum pump.