Dräger Narkomed 2B Operator's Instruction Manual page 72

Section 5 - Operation
Vaporizer
5-2-8
9. Watch the sight glass while the vaporizer is filling, and close the
filler valve when the liquid level reaches the lower of the two marks
at the upper end of the sight glass. The lower mark is the FULL
mark; the upper mark is the OVERFLOW mark.
NOTE: The capacity of the vaporizer is approximately 140 cm
with wet wick, and approximately 200 cm
10. Remove the adapter from the filler port.
11. Allow excess liquid to drain from the filler port.
12. Fully insert the filler port plug in the filler port and tighten the
plug in place by turning the lock screw clockwise.
13. After filling, check the level at the sight glass. When the
vaporizer is in an upright position, the level must not exceed the
FULL mark.
If the vaporizer is inadvertently overfilled (FULL mark exceeded),
drain the excess anesthetic. For information on draining the
vaporizer, refer to "Draining Vaporizer with Key Indexed Safety
System" later in this section.
14. Remove the adapter from the bottle.
15. Place the cap back on the bottle.
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with dry wick.