Arena Service Manual
12.1.3 Drip Chamber Level Adjust
The Drip Chamber Level Adjust System allows the operator to
change the blood level in the arterial and venous drip chambers as
well as the optional SND Expansion Chamber. It also allows the
operator to purge the single-use external ultrafilter used in an
Instrument with the optional OLHDF feature.
Figure 12-5. Arterial Drip, Venous Drip, and SND Expansion Chamber
Level Adjust
A level adjust up and level adjust down button exists for each drip
chamber. The Blood Pump Controller Board monitors the button
positions. When the venous level adjust button is pressed, a valve
opens up a peristaltic pump to the venous drip chamber. Power is
supplied to the motor, rotating the pump head of the peristaltic
pump. The peristaltic pump applies a vacuum or a positive
pressure to the drip chamber. The software logic accepts only one
button press at a time. If two buttons are pressed simultaneously,
12-8 157-1278-919 Rev A
April 2004
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