Dräger Fabius 4116029 Technical & Service Manual page 66

Function Description
12 Flow Measurement
A moving screen (moving vane) measures the expiratory flow of the patient. A
flow-dependent pressure builds up at the moving vane. This pressure is picked up at
the differential pressure sensor ( ∆ P). The differential pressure sensor converts the
pressure into an electronic signal and transmits this signal to the microcontroller.
.
V
measuring line
P
measuring line
Fig. 41: Flow measurement principle
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P
flow sensor
moving vane
∆
P results from the differential pressure
(back-pressure from measuring lines 1 and 2)
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Fabius