Section 5 - Operation
Oxygen Monitoring
Oxygen Alarm
Messages
The following list contains all warning, caution and advisory alarms
associated with oxygen monitoring.
% OXYGEN LOW
(Warning)
The Narkomed 2B continuously compares the current inspiratory oxygen
percentage with the preset low oxygen alarm limit. If the measured
oxygen concentration falls below the low alarm limit, the Warning
message % OXYGEN LOW appears on the central alarm display and a
continuous audible alarm sounds.
% OXYGEN
HIGH
(Advisory)
If the measured inspiratory oxygen concentration exceeds the preset
high alarm limit, the Advisory message % OXYGEN HIGH appears on
the central alarm display and a single-tone audible alarm sounds.
O2 SENS DISC
(Advisory)
If the oxygen sensor cord becomes disconnected (or is damaged enough to
cause an open circuit), the Advisory message O2 SENS DISC appears on
the central alarm display and a single-tone audible alarm sounds. These
additional messages are displayed as well: O2 NOT CAL and O2 ALARM
OFF. Also, since cord disconnection invalidates the calibration, the %
OXYGEN display area is blank.
If you then plug the sensor cord back into the interface panel, the
O2 SENS DISC message is removed from the central alarm display, and
the % OXYGEN display area remains blank until you perform a new
calibration.
O2 SENS ERR
(Advisory)
During oxygen sensor calibration and monitoring, the Narkomed 2B
checks for a difference between the outputs of the two sensor halves. If
the difference exceeds a predetermined percentage, the Advisory
message O2 SENS ERR appears on the central alarm display.
During oxygen sensor calibration, the Narkomed 2B also checks the
sensor’s output against a range of acceptable output voltages. There are
three possible causes for deviation from within this range.
• Exhausted sensor. If the sensor’s capacity is exhausted, its output
voltage will not meet the required minimum.
• Incorrect calibration environment. If the sensor is exposed to an
excessively rich or lean oxygen concentration during calibration, the
sensor’s output will be above or below the acceptable output range.
• Improper waiting. If the proper waiting period is not allowed for a
new sensor or for a sensor removed from the sensor housing, the
sensor’s output may be above or below the acceptable output range.
If a sensor error condition is detected during monitoring, the Advisory
message O2 SENS ERR appears on the central alarm display, but
operation can continue. If the monitor detects this condition during
5-10-9
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