Inflatable Vacuum-Sealed Quartz Tube System Operating Instructions

Before starting the sealing process, carefully check the instrument for any malfunctions. Ensure all seal valves are closed, and check if the acetylene and oxygen tanks are empty. If inflation is required, also check if the high-purity argon (Ar) is depleted. If there are no issues with the equipment and gas cylinders, proceed with the following operations:

Choose the appropriate quartz tube, socket, and sealing ring.

Turn on the main power switch G1 and the mechanical pump switch G2. Slowly open valve V4. Once the low vacuum gauge (right dial) shows less than 5Pa, close V4.

Slowly open valve V1. Once the low vacuum gauge stabilizes, turn on the turbomolecular pump switch G3. After stabilization, open valve V2. You can also start the high vacuum gauge (left dial) to monitor the vacuum level. Begin sealing once the vacuum reaches the requirement (generally lower than 10-5Pa).

Close valves V2 and V1, open the Ar gas cylinder, and adjust valve V3 to inflate. Close V3 and the gas cylinder once the required gas flow is achieved.

Open the acetylene and oxygen cylinders. Before igniting, ensure to purge the air hose of any residual air. Slightly open the acetylene nozzle (red knob) for ignition.

Alternately adjust the acetylene and oxygen knobs (blue knobs) to achieve the desired flame.

Once the flame is adjusted, proceed with the necessary tube sealing operations.

Alternately close the acetylene and oxygen knobs, turning off the acetylene last until the flame is extinguished. Shut off the acetylene and oxygen cylinders and purge the remaining gases from the air hose. Close valves V2 and V1, remove the quartz tube, and prepare for the next sealing operation (repeat steps 1-7).

After all experiments are completed, tighten valves V4, V3, V2, and V1 in sequence. Turn off switches G3, G2, and G1. Clean up the area and make proper experimental records.

• Ensure the quartz tube is clean and dry to prevent contamination of the turbomolecular pump with moisture or debris.

• The sealing area should be more than 15cm from the joint to prevent high-temperature damage to the sealing gasket.

• Handle the turbomolecular pump valve V2 with caution during experiments to prevent atmospheric air from directly entering the pump, which could trigger alarms and damage the pump.

• Vacuum levels can be influenced by atmospheric conditions. If the vacuum does not meet requirements for an extended period, consider heating the turbomolecular pump and baking the quartz tube and piping, but avoid excessive temperatures that could be hazardous.

• After igniting, do not direct the flame towards acetylene or oxygen hoses or other nearby items to prevent explosions.

• Clean the site after experiments are complete to ensure that gas cylinders, valves, and power sources are all turned off, and record the experiments properly.

• Users must follow these regulations. Violations that lead to accidents will be strictly dealt with.

• Contact the instrument manager if there are any questions.

1. To prevent the flame from flickering during the sealing process, close the windows. However, after the operation, open the windows promptly to ventilate any residual acetylene or oxygen inside the air hose.
2. If inflating, calculate the safe amount of gas to avoid difficulties in sealing and dangers during the annealing process.
3. If a seal leaks during the experiment, promptly close the turbomolecular pump valve V2 under permissible conditions to prevent a sudden influx of gas that could damage the pump blades.
4. Place warning signs if the vacuuming process is unattended to prevent others from accidentally breaking the glass tube and causing an alarm due to air entering the pump. If the glass tube is accidentally broken, promptly notify the sample owner to discuss a resolution.
5. If no one will use the instrument after sealing, place an empty glass tube, draw it to a low vacuum, then shut down the instrument to maintain a clean internal vacuum system.
6. Avoid leaving the high vacuum ion gauge on for extended periods.

Global Quartz Tube specializes in providing high-quality quartz products and customized solutions for industrial applications. For further information or assistance, please contact us at contact@globalquartztube.com.