A5/A3™ Service Manual 046-001141-00 1 - 3
Theory of Operation Introduction
The A5/A3 breathing system is warmed to minimize condensation inside the breathing system block
and to return humid gas to the patient. The breathing system provides easy access to the Airway
Pressure Limiting (APL) valve and breathing bag, and easy viewing of the Airway Pressure gauge
(PAW). The APL valve has a comfortable, single turn knob that provides a clear view of the manual
breathing pressure setting. The absorber assembly incorporates a cam lock device that is convenient
to open and close. CO2 absorbent Pre-paks or loose fill can be used. A water trap that can be drained
is also provided on the absorber assembly.
Two flow sensors in the breathing system measure inspired and expired gases for control and
monitoring. Spirometry is standard on the A5. Inspired oxygen is monitored via a fuel-cell type sensor.
Breathing pressure is also monitored. The breathing system can swivel into position. A test plug, next
to the two main hose connections, allows automated leak testing during startup. The Anesthesia Gas
Scavenging System (AGSS) connections are at the rear of A5/A3.
The A5/A3 is powered by an AC power source. In turn, the A5/A3 power management system
provides DC power for its main system functions while charging its internal battery supply. In case of
AC power failure, the A5/A3 operates on battery power for a minimum of 75 minutes with one (1)
new battery installed (A3) or 150 minutes with two (2) new batteries installed (A5). A recessed main
switch is provided to power the system ON and OFF. Four (4) auxiliary AC outlets on the A5 and three
(3) auxiliary AC outlets on the A3 at the rear of the machine operate independently of the main
switch position.
NOTE: The breathing system warmer does not operate when the A5/A3 is on
battery power.
NOTE: If the main switch is set to OFF, the O2 fresh gas flow will not flow.
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