13.18 Gas analyzer validation
Description
Requirements according to ISO
80601-2-55
The test method consists of sampling gas from two different sources
connected to an electrically controlled pneumatic valve to permit
rapid switching between the two sources. During the test, the valve
is set to switch gas source at a number of frequencies (simulating
the range of specified breath rates) and for each frequency the
end-tidal value presented by the gas analyzer is noted. From a
diagram of end-tidal value over frequency, the frequency at which
the gas analyzer is no longer able to resolve end-tidal values
according to specification is identified.
Test method used to determine
the rated respiration rate range
and the corresponding effects of
end-tidal gas reading accuracy as
a function of respiratory rate
25 HzData sampling rate
End-tidal CO
2
concentration readings are identified by the gas
analyzer using the highest values of the CO
2
-curve. Corresponding
readings of N
2
O and anesthetic agents are taken at the same point
in time. End-tidal O
2
concentration readings are identified by the O
2
mean value during the expiratory phase as identified by the CO
2
curve. Once correctly identified, the lowest O
2
concentration readings
during the expiratory phase will be presented as end-tidal O
2
.
Method used to calculate
end-tidal gas readings
FLOW-i 4.2, User's Manual
283
| Technical specifications |
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