4. Hydraulic Theory
4.2.8 Air Removal System
The air removal system removes dissolved gases that are trapped
in the water used to make up dialysate. The air removal system
consists of the air removal sprayer, the air removal pump, and the
vented air trap.
The air removal sprayer nozzle restricts the flow so that a partial
vacuum of approximately 500 to 650 mmHg is created in the air
removal sprayer chamber. The fluid that passes through the air
removal sprayer is deflected into a conical spray pattern. By
developing a spray pattern, a larger surface area is exposed to the
500 to 650 mmHg vacuum. The vacuum pulls the air out of the
solution. Due to the large surface area of fluid exposed to the
vacuum, the rate at which the air comes out of the water is
increased, enhancing the air removal function.
The air removal pump (also known as the deaeration pump) runs at
a constant speed of approximately 1500 mL/min for all flow rates,
pulling the solution through the air removal sprayer nozzle.
The vented air trap provides an opening for air to leave the system.
For more information, refer to Section 4.2.7 and Section 7,
Dialysate Preparation.
4.2.9 "A" & "B" Rinse Fittings
The “A” and “B” rinse fittings are located on the right side panel
of the Instrument. Both fittings are connected to a source of water
in the supply manifold. This water is used to rinse the concentrate
lines and concentrate pumps.
A proximity sensor built into each of the rinse fittings senses when
the concentrate lines are attached. The rinse fittings are keyed so
that the “A” concentrate line will not fit into the “B” concentrate
fitting and vice versa. When the “B” concentrate line is not in use
during acetate dialysis or during rinse, it is connected to its rinse
fitting.
4.2.10 Supply Pump Recirculation Loop
The supply pump recirculation loop mixes the “B” concentrate,
monitors the total conductivity, regulates the pressure, and pumps
dialysate to the flow equalizer. This loop contains the inlet for the
“B” concentrate pump, the "B" (bicarbonate) mix chamber, the
157-1278-893 4-9
January 2004
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