LOW-PRESSURE SYSTEM

*4. Check Initial Status of the Low-Pressure System

1. Close flow control valves, and turn vaporizers off.
2. Check the fill level, and tighten the vaporizers' filler caps.

*5. Perform a Leak Check of the Machine's Low-Pressure System

1. Verify that the machine master switch and flow control valves are OFF.
2. Attach a suction bulb to the common (fresh) gas outlet.
3. Squeeze the bulb repeatedly until fully collapsed.
4. Verify bulb stays fully collapsed for at least 10 seconds.
5. Open one vaporizer at a time, and repeat steps c and d above.
6. Remove the suction bulb, and reconnect the frésh gas hose.

*6. Turn on the Machine's Master Switch and All Other Necessary Electrical Equipment.

*7. Test Flow Meters

1. Adjust flow of all gases through their full range, checking for smooth operation of floats and undamaged flow tubes.
2. Attempt to create a hypoxic O₂ /N₂ O mixture, and verify correct changes in the flow and/or alarms.