S/5 Airway modules
Document No. 800 1005-1
17
Figure 10
CO
2
/N
2
O/AA measurement block diagram
2.2.3
OM measuring unit
The oxygen measurement is based on the paramagnetic susceptibility, which is a unique property
of oxygen among all gases generally present in a breathing gas mixture. The gas to be measured
and the reference gas, which usually is room air, are conducted into a gap in an electromagnet with
a strong magnetic field switched on and off at a frequency of approximately 110 Hz.
An alternating differential pressure is generated between the sample and reference inputs due to
forces acting to the oxygen molecules in a magnetic field gradient.
The pressure is measured with a sensitive differential transducer, rectified with a synchronous
detector and amplified to produce a DC voltage proportional to the oxygen partial pressure
difference of the two gases.
Содержание S/5 B-GAS
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