Theory of operation
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Puritan Bennett™ 700 Series Ventilator System Service Manual
Initial settings and data for use by the microprocessor are entered by the operator via the
user interface (UI). The data is processed by the UI microprocessor, then stored in the
ventilator memory. The BD microprocessor uses this data to control the flow of gas to the
patient system. Power to operate the ventilator comes from the AC mains (via a 24 V DC
power supply output), or from an internal or external (optional) rechargeable backup
battery. The external battery (if present) is used if AC power is interrupted. The internal
battery is used if the external battery is exhausted or not present. The external battery can be
connected or disconnected without any interruption in ventilation.
Figure 2-1. 700 Series Ventilator System
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Summary of Contents for Puritan Bennett 700 Series
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