Vac-U-Tube

Can the air sample in the bag become contaminated from the lubricant in the Vac-U-Tube or on its plunger?

If the procedures in the Vac-U-Tube Operating Instructions are followed, the possibility of contamination from the lubricant should be remote.…

If the procedures in the Vac-U-Tube Operating Instructions are followed, the possibility of contamination from the lubricant should be remote. The sampling bag is connected to a piece of PTFE tubing, which passes through the face plate via a stainless steel compression fitting. The sample should never come into contact with anything other than inert PTFE or stainless steel.

Note that the Vac-U-Tube is now discontinued.

Why is the plunger in the Vac-U-Tube difficult to move?

First use of Vac-U-Tube: Depending on how long the Vac-U-Tube has been idle, the plunger may be difficult to move…
  1. First use of Vac-U-Tube: Depending on how long the Vac-U-Tube has been idle, the plunger may be difficult to move upon first use. Solution: Move it. The inside of the Vac-U-Tube is coated with a lubricant during manufacturing. Remove the face plate and move the plunger up and down several times to re-coat the O-ring.
  2. Plunger fails to move at all after cleaning the Vac-U-Tube. Because of close tolerances, the Vac-U-Tube plunger will not slide readily if the inside of the tube is not lubricated. Spray fluoropolymer/silicone spray on the inside of the tube to facilitate plunger movement.

Note that the Vac-U-Tube is now discontinued.