Nellcor N-200 Operator's Manual page 36

Guide to Operation
If alarms activate because the sensor or patient module is
disconnected, the displays become blank, the PULSE SEARCH
indicator flashes, and an audio alarm sounds (unless or until it
has been silenced). If C-LOCK is in use, only the OXYGEN
SATURATION display becomes blank.
If the alarm activates because the ECG signal is lost, the ECG
LOST indicator flashes. This is accompanied by a single low
pitch beep to alert the user.
The audio alarm function can be altered in several ways: it can
be silenced temporarily, it can be disabled, and its volume can
be adjusted. The visible alarm cannot be turned off.
Checking Alarm Limits
Check the alarm limits each time the N-200 is used, by
sequentially pressing the HIGH SAT, LOW SAT, HIGH RATE,
and LOW RATE buttons. The unit displays each limit in turn.
Adjusting Alarm Limits
To adjust the alarm limits to meet a specific patient's needs,
press and hold the appropriate button (HIGH SAT, LOW SAT,
HIGH RATE, or LOW RATE), and turn the control knob until
the display shows the desired value. Oxygen saturation alarm
limits may be set for any value from 20% to 100%, and the
pulse rate alarm limits may be set for any value from 20 to
250beats per minute. The upper limit must be higher than the
lower limit.
Note: When the operator turns the N-200 off and back on
again, alarm limits return to default values.
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