Operating A High Vacuum Pump

Starting up:

  1. Connect a clean and dry trap to the pump and to the vaccum line (grease it).
  2. With the dewar lowered and the system closed to air, turn the vaccum pump on and ensure vaccum preformance is leak free.
  3. Connect your flask to the vaccum line.
  4. Place the trap carefully into dewar half filled with liquid nitrogen and open the valve.

If liquid oxygen (blue color) is suspected to have been condensed, call 08-934-2999 immediately.

Shutting down:

  1. Carefully remove the dewar with liquid nitrogen and turn off the pump (read below!).
  2. Always close the valve between the vaccum vessel and the pump before shutting off the pump.
  3. To avoid sucking vaccum oil into the system, release the vaccum immediately, after shutting down the pump. 
  4. Allow the trap to warm up tp the room temperature before disposing of any solvents.
  5. If the cold trap is likely to have condensed toxic or corrosive vapors, the entire assembly must be placed in the fume hood overnight.
  6. Wash the trap.

Use personal protective equipment: safety glasses, a lab coat, closed shoes and gloves. For liquid nitrogen, use also: full face shield and gloves for cryogenic substances.

Always make sure the trap is removed from liquid nitrogen prior to turning off vaccum, as there is a potential for the formation if liquid oxigen (blue color), in nitrogen cooled vessels - it may cause serious explosion!!!

vaccum pump picture