Displays; Equipment Indications; Status Indicator; Digital Displays - Nonin 8500AV Operator's Manual

Displays

Equipment Indications

Sensor
If the Model 8500AV determines that a sensor fault exists (sensor disconnect, sensor failure, or sensor
dislodgment), a minus (-) sign appears in the left-most digit of the SpO
displayed will remain unchanged while the sensor fault exists. Dashes will be displayed 10 seconds after the minus
sign appears if the sensor fault is not corrected.
Battery Low
If the Model 8500AV determines that a battery low condition exists, then the numerical displays will flash on and
off at a one second rate and the batteries must be replaced.

Status Indicator

Perfusion
The perfusion indicator (identified by the waveform symbol) will flash green for each adequate strength pulse for
measuring oxygen saturation. If the pulse becomes non discernible, the indicator will blink red until this condition
terminates. If the pulse strength is marginal or the oximeter recognizes artifact, the light will blink yellow with each
pulse while this condition exists.
The perfusion LED is a simple method of alerting the user to changes in the pulse waveform signal that may affect
the SpO data. The following is a simple illustration of how to interpret the perfusion LED:
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Perfusion LED blinks "GREEN"—pulse waveform signal is of good quality and SpO
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Perfusion LED blinks "Yellow"—pulse waveform signal is of marginal quality and although SpO
acceptable, corrective measures should be considered to improve sensor placement or change sensor type.
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Perfusion LED blinks "RED"—pulse waveform signal is too small or the quality is very poor. SpO
displays will go to dashes after approximately 10 seconds to avoid confusing the user with inaccurate SpO
data.
This simple method gives the user a pulse by pulse visual indication of waveform signal quality without requiring
the user to perform complex waveform analysis during critical patient care situations.

Digital Displays

SpO Display
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The left digital display is a 3 digit light emitting diode (LED) digital display that displays oxygen saturation
percentage. Reference Figure 1. Oxygen saturation is calculated and displayed using a four beat exponential
averaging technique.
Pulse Rate
The right digital display is a 3 digit LED digital display that displays pulse rate in pulses per minute. Reference
Figure 1. The displayed pulse rate is averaged using a nominal eight beat sliding averaging technique.
display. The readings that are being
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data is accurate.
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data is
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