4. Hydraulic Theory
Figure 4-5. Supply Manifold
4.2.7.1 “A” Mix Chamber and Air Gap
As the name implies, the “A” mix chamber mixes the water and
“A” concentrate into a uniform solution.
The air gap at the top of this chamber is at atmospheric pressure,
which helps to limit proportioning errors. The air gap also acts as
a barrier preventing back flow in the event of a drop in the
incoming water pressure.
4.2.7.2 Air Removal Sprayer
The sprayer is part of the air removal system. Refer to Section 7,
Dialysate Preparation, for more information.
4.2.7.3 Air Trap and Level Sensor
The air trap and level sensor control the flow of water into the
hydraulic system by causing the water on/off valve to open when
the level drops and by closing the valve when the level rises.
The level sensor consists of a float with magnet and a Hall-effect
switch. When the water level float magnet is below the sensor, the
condition indicates the need for more water, opening the incoming
157-1278-893 4-7
January 2004
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