Theory of operation
2-6
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
Solenoid, autozero,
cylinder pressure
transducer
Three-way
De-energized (closed):
Except when transducer is autozeroed.
Energized (opened):
When transducer is autozeroed (upon power-
on, once a minute for first 10 minutes, then hourly).
Solenoid, autozero,
exhalation pressure
transducer
Three-way.
De-energized (closed):
During normal operation.
Energized (opened):
When transducer is autozeroed (upon power-
on, once a minute for first 10 minutes, then hourly).
Solenoid, exhalation
Three-way
De-energized:
Pilots exhalation valve with PEEP pilot pressure.
During exhalation.
Energized:
Pilots exhalation valve with inspiration gas. During
inspiration.
Solenoid, safety valve
Three-way
De-energized (opened):
Under software control: Due to a ventilator
inoperative (VENT INOP) condition (including when pressure exceeds
92 cmH
2
O) and during POST. By dedicated circuit: at 115 cmH
2
O
under hardware control.
Energized (closed):
All other times
.
Solenoid assembly, oxygen
(includes low- and high-
flow solenoids, and
orifices)
High-flow solenoid: Two-way
Energized (opened):
High oxygen flow requirements.
De-energized (closed):
Other times.
Low-flow solenoid: Two-way
Energized (opened):
Low oxygen flow requirements.
De-energized (closed):
Other times.
Switch, air intake filter
A microswitch located in the air intake manifold, which is actuated
when an air intake filter is present.
Thermistor, inspiration
manifold
Measures inspiration gas temperature.
Thermistor assembly,
exhalation
Measures temperature of blanket heater.
Transducer, pressure,
cylinder
Measures cylinder pressure. On pressure solenoid PCB.
Transducer, pressure,
exhalation flow sensor
Monitors pressures on both sides of flow sensor screen. Flow is
determined from pressure drop. On pressure solenoid PCB.
Transducer, pressure,
exhalation
Measures pressure of exhaled gas. On pressure solenoid PCB.
Transducer, pressure,
inspiration
Measures inspiratory pressure and absolute atmospheric pressure.
On pressure solenoid PCB.
Transducer, pressure,
oxygen regulator
Measures oxygen source pressure at oxygen solenoid assembly.
Table 2-1: Pneumatic component data (continued)
Component
Data
Summary of Contents for Puritan Bennett 700 Series
Page 1: ...Service Manual Puritan Bennett 700 Series Ventilator Systems TM...
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