13-2
Narkomed GS Operator’s Instruction Manual
Draeger Medical, Inc.
13
Respiratory Volume Monitoring
Overview
Respiratory volume is measured using an ultrasonic flow sensor which is
attached to the expiratory valve and mounted to the top of the absorber
assembly as shown in Figure 13-1. The ultrasonic flow sensor has two
transducers that measure the time of flight of ultrasonic pulses
transmitted upstream and downstream in the respiratory flow path. The
difference in time of flight is used to determine the velocity and the flow
rate of gas through the patient circuit. The flow sensor output is converted
into meaningful readings for minute volume, tidal volume, and respiratory
rate displays.
Figure 13-1. Respiratory Volume System
WARNING:
The ultrasonic flow sensor can be used with all normal
anesthetic gases except oxygen-helium (heliox). Incorrect
flow measurements will result if heliox is used.
OP00225
INSPIRATORY
VALVE
REAR PANEL OF
VENTILATOR BOX
2
RESPIRATORY
VOLUME SENSOR
(ULTRASONIC
FLOW SENSOR)
EXPIRATORY
VALVE
SENSOR
CABLE
CONNECTOR HOSE
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