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Installing Batteries
Two 1.5 volt AAA-size batteries power the 9550 for about 10,000 spot checks or 63 hours of operation. Nonin
recommends using alkaline batteries (included with each new device). When batteries are low, the numeric displays
flash once per second. Remove batteries if the device will be stored for more than 30 days. Replace low batteries as
soon as possible, using the instructions below.
WARNING: Before changing batteries, make sure the device is off and is not applied to a digit.
NOTE: Rechargeable batteries may be used; however, they require more frequent replacement.
1. Hold the 9550 as shown in figure A. To release the device's battery tray, press upward and then pull outward
slightly with the thumb.
2. Remove the old batteries from the battery tray. Dispose of the batteries properly.
3. Insert two new 1.5 volt AAA-size batteries. Follow the polarity markings (+ and -) as illustrated in figure B. Proper
positioning of the batteries is essential for operation.
4. Carefully guide the battery tray back onto the device. Press downward and the push inward slightly to re-secure
the battery tray (figure C). Do not force it into place; it fits only when properly positioned.
5. Insert your finger into the device to verify operation. See the Activating the Onyx II 9550 and Verifying Operation
section for more information.
A
Activating the Onyx II 9550 and Verifying Operation
The device contains numeric Light-Emitting Diodes (LEDs) that display oxygen saturation and pulse rate. A tricolor
LED display (pulse quality indicator, shown at left) provides a visual indication of the pulse signal quality, while
blinking at the corresponding pulse rate. This display changes colors to alert you to changes in pulse quality that
may affect the readings:
• Green indicates a good pulse signal.
• Yellow indicates a marginal pulse signal.
• Red indicates an inadequate pulse signal.
Activate the 9550 by inserting the patient's finger into the device. The device detects the inserted finger and
automatically illuminates the displays. Correct positioning of the device on the finger is critical for accurate
Pulse Quality
measurements.
Indicator
NOTE: While on the finger, do not press the device against any surface and do not squeeze or hold it together. The
internal spring provides the correct pressure; additional pressure may cause inaccurate readings.
1. Insert the patient's finger, nail side up, into the 9550 until the fingertip touches the built-in stop guide.
2. Make sure the finger is lying flat (not on its side) and is centered within the device. For best results, keep the 9550
at the patient's heart or chest level.
3. If the device does not turn on, remove the finger and wait a few seconds before reinserting it.
When a finger is inserted, the device performs a brief startup sequence. Verify that all LEDs illuminate during the
startup sequence. If any LED is not lit, do not use the 9550; contact Nonin Technical Service for repair or
replacement.
After the startup sequence, the device begins sensing the pulse (indicated by the blinking pulse quality indicator).
Allow the device to stabilize and observe about 4 seconds of continuous green-colored pulse quality before relying
on the displayed values. Continually verify operation. It is common for the displayed values to fluctuate slightly over
a period of several seconds. If the pulse quality indicator blinks yellow or red, try another finger.
B
C
3
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