12. Pressure Monitoring
measurement range from –300 to +600 mmHg. The BP Controller
Board uses the signals from these amplifiers.
Blood Pump Controller Board
The output of each amplifier on the BP Power Board drives an
A/D input channel on the Blood Pump Controller board, at which
point it is converted to a digital value. The calibration of each
pressure input is handled entirely in software, requiring that the
design of each amplifier guarantee that its output remain within the
A/D input range of 0 to +5 V over the input pressure range and
over all component tolerances.
The Blood Pump-Double Pump Controller Board provides the
digital pressure value to the Single Board Computer (SBC).
Single Board Computer
The SBC compares the pressure value with the alarm limits. On
detection of a pressure alarm condition lasting longer than the
service technician-set alarm delay (see Section 17.3.2.15), the SBC
creates an audio and visual alarm, commands the Blood Pump
Controller to stop the blood pump, and commands the I/O
Controller to clamp the venous line clamp. When the venous line
clamp is clamped, the I/O Controller also shuts off the blood
pump.
157-1278-919 Rev A 12-7
April 2004
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