Puritan Bennett 840 Service Manual

2 Theory of operation
2-34 Puritan Bennett 800 Series Ventilator System Service Manual
The inspiratory pressure transducer autozero solenoid (SOL1) is energized periodically to set a
zero reference or offset voltage for the inspiration pressure transducer.
2.3.1.4.2 Oxygen flow summary
The following paragraphs describe oxygen flow throughout the inspiratory module
(Figure 2-28).
Figure 2-28. Oxygen flow diagram
1 Oxygen inlet fitting
2 Oxygen impact filter (F1)
3 Oxygen inlet filter (F3)
4 Oxygen pressure switch (PS1)
5 Transfer tube
6 Check valve manifold
7 Oxygen impact screen filter (F5)
8 Oxygen regulator (REG1)
9 Regulator vent
10 Flow sensor manifold
11 Oxygen pressure valve (TP1)
12 Oxygen pneumatic noise filter (F7)
13 Oxygen flow sensor (Q1)
14 PSOL/SV manifold

Puritan Bennett 840 Specifications

General

Type	Ventilator
Flow Rate	Up to 180 L/min
Power Requirements	100-240 VAC, 50/60 Hz
Display	Color LCD Touchscreen
Category	Critical Care
Manufacturer	Medtronic
Model	840
Operating Modes	Assist/Control, SIMV, Spontaneous, BiLevel
FiO2 Range	21 to 100%
PEEP/CPAP Range	0-45 cmH2O
Alarms	High/Low Pressure, High/Low Volume, Apnea, High Respiratory Rate
Power Source	AC Power
Data Connectivity	RS-232
Compliance	ISO 80601-2-12