Dräger Fabius, Instructions For Use Manual, Page: 125 / 232

Instructions for Use Fabius MRI SW 3.n
125
Monitoring
Consequences of Incorrect O
2
Calibration
If the oxygen sensor is improperly calibrated, it can
cause inaccurate measurements. When a calibra-
tion gas mixture is excessively rich or lean in oxy-
gen, the Fabius MRI will not complete an attempted
calibration; however, if the calibration gas is rich or
lean but is within certain limits, the Fabius MRI will
complete the calibration. As a result, when display-
ing sensor measurements, the Fabius MRI displays
an oxygen percentage either higher or lower than
the actual oxygen percentage. Therefore, make
sure that the sensor is exposed only to room air
during the entire calibration period.
The figure illustrates the relationship between the
calibration mixture and the accuracy of oxygen
measurement.
A Displayed O
2
Percentage
B Actual O
2
Percentage
1 At calibration, sensor exposed to <21 % O
2
.
Thus, displayed % O
2
will be higher than actual
O
2
.
2 Correct calibration of room air (21 % O
2
) for
entire calibration period.
Displayed % O
2
= actual % O
2
.
3 At calibration, sensor exposed to >21 % O
2
.
Thus, displayed % O
2
will be lower than actual
% O
2
.
034
100
90
80
70
60
50
40
30
20
10
0
100 90 80 70 60 50 40 30 20 10
A
1
2
3
B