Dräger Narkomed 2B - Page 114

Section 5 - Operation
Oxygen Monitoring
Consequences
If the oxygen sensor is improperly calibrated, it can cause inaccurate
measurements. When a calibration gas mixture is excessively rich or
lean in oxygen, the Narkomed 2B will not complete an attempted
calibration; however, if the calibration gas is rich or lean but is within
certain limits, the Narkomed 2B will complete the calibration. As a
result, when displaying sensor measurements, the Narkomed 2B
displays an oxygen percentage either greater or less than the actual
oxygen percentage. Therefore, make sure that the sensor is exposed only
to room air during the entire calibration period.
The following figure illustrates the relationship between the calibration
mixture and the accuracy of oxygen measurement.
DISPLAY O2
PERCENTAGE
ACTUAL O2 PERCENTAGE
Correct calibration of room air
(21% O2) for entire calibration period.
Displayed % O2 = actual % O2.
At calibration, sensor exposed
to > 21% O2. Thus displayed % O2
will be lower than actual % O2.
At calibration, sensor exposed
to <21% O2. Thus displayed % O2
will be higher than actual O2.
OP10098
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