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Operation: Advanced
36
Changing Air Cylinders
The Inspira ventilators use two easily interchangeable piston/cylinder assemblies.
These assemblies are available to provide 0.1 to 10 ml and 1 to 100 ml tidal volumes.
Changing the piston/cylinder assembly is simple. Remove the top cover of the venti-
lator by removing the seven phillips head screws which hold the top cover in place.
Once the top cover is removed locate the currently installed cylinder. Move Inspira's
white plunger back by turning the coupling connecting the black lead screw to the
motor shaft. Turn the lead screw until the flag pin on the rear of the plunger is verti-
cally in-line with the rear switch as seen illustrated below. Remove this cylinder by
unscrewing it from the valve block. Next, carefully remove the cylinder from the
Inspira chassis. Place the O-ring from the extracted cylinder back into the mounting
groove, which is found on the valve block. *(Note:When installing the air cylinder, do
not change the bends of the cylinder detection switches or else the correct cylinder
will not be detected.) Now insert the new cylinder by placing the plunger portion of
the air cylinder on the end of Inspira's white plunger.
Carefully slide the air cylinder back on the white plunger compressing the air cylinder
just enough to allow the front end of the cylinder to be lowered into place. Once the
air cylinder is fit in place, screw the air cylinder's threaded nipple into the valve block
and hand tighten the cylinder in place.
Now that the air cylinder is in place, rotate the lead screw into position so that the flag
pin in between both the front and rear switches. To complete the installation, replace
the top cover of the Inspira unit. When Inspira is powered on it should display the
correct cylinder size after initializing.The ventilator automatically detects which size
cylinder is installed.
Publication 5404-001-REV-C
CAUTION: Do not overtighten cylinder. Overtightening may cause
glass cylinder to crack.
Figure 12. Changing Air Cylinders
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