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1. Read the pressure from the Ion Gauge Controller and record as "Chamber pressure before venting" in the log sheet. Turn the Ion Gauge Controller OFF by pressing the button labeled |ON one time.
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2. Locate the Gate Valve handle, rotate the knob clockwise until the handle feels tight and locks into place.
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3. Locate the Vent valve knob, slowly rotate the knob counter clockwise until the knob stops.  
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4. Venting will take 2-3 minutes.  Venting is complete when a small gap forms between the bell jar and the base.
   
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