Arena Service Manual
12.1.2 Measurement
Extracorporeal circuit pressure measurements include the arterial
and venous pressures. There is also an identical circuit for the
expansion chamber pressure used with the double pump single
needle device on the Blood Pump Power Board. All pressure
measurement systems include identical hardware. The following
block diagram describes the pressure measuring system.
Figure 12-4. Arterial, Venous, and SND Pressure Block Diagram
Blood Pump Power Board
Each pressure is sensed by a gauge pressure-sensing transducer
mounted to the Blood Pump Power Board. The purpose of a
pressure transducer is to convert a positive or negative pressure
into a corresponding electrical signal. Each transducer is
connected to a differential amplifier designed to provide a
12-6 157-1278-919 Rev A
April 2004
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