Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-61
2.3.8.4 Air flow thermistor assembly
The air flow thermistor assembly includes two thermistor beads, one mounted in the air flow
and the other mounted in unmoving air. (See Figure 2-49 for air thermistor assembly and
Figure 2-50 for air flow thermistor assembly installed on air intake manifold.) Readings from
both thermistors are compared to determine whether air is flowing in the unit (whether the
fan is operating and the fan filter is unclogged). (It is important to maintain continuous air
flow, preventing oxygen buildup inside the ventilator.) An insufficient air flow causes an
alarm.
Figure 2-49. Air flow thermistor assembly
Figure 2-50. Air flow thermistor assembly installed on air intake manifold
7-00162
7-00265
Air flow
thermistor
assembly
Summary of Contents for Puritan Bennett 700 Series
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