Model 8500

Model 8500 Specifications

Print Specs

Oxygen Saturation Display Range: 0% to 100% SpO2
Pulse Rate Display Range: 18 to 321 beats per minute (BPM)
Accuracy – Sensors: Declared accuracy data for compatible sensors can be found in Nonin’s Sensor Accuracy document.
Measurement Wavelengths and Output Power**:
Red: 660 nanometers @ 0.8 mW maximum average
Infrared: 910 nanometers @ 1.2 mW maximum average

Pulse Quality Indicator: LED, tricolor
Numeric Displays: 3-digit, 7-segment LEDs, red

Operating: -20 to +40 °C (-4 to +104 °F)
Storage/Transportation: -40 to +70 °C (-40 to +158 °F)

Operating: 10% to 90% non-condensing
Storage/Transportation: 10% to 95% non-condensing

Operating: Up to 4,000 meters (13,123 feet)
Hyperbaric Pressure: Up to 4 atmospheres

Power Requirements:
Six 1.5V AA-size alkaline batteries.
100 hours maximum display brightness.
160 hours with normal display brightness.

Dimensions: 8 cm W x 15 cm H x 2.5 cm D (3 in W x 6 in H x 1 in D)
Weight: 280 g (10 oz) (with alkaline batteries)
Classifications per IEC 60601-1 / CAN/CSA-C22.2 No. 601.1 / UL60601-1:
Type of Protection: Internally powered (on battery power)
Degree of Protection: Type BF-Applied Part
Mode of Operation: Continuous

Enclosure Degree of Ingress Protection: IP33

This device is not made with natural rubber latex.

** This information is especially useful for clinicians performing photodynamic therapy.

Model 8500 Troubleshooting

Nonin 8500

  • Unit will not turn on:
    1. Install six new batteries, ie Duracell, Energizer ect (avoid off brand low quality batteries)
    2. Verify correct polarity of the batteries (FIGURE 2)
    3. Verify battery door has metal contact
    4. Disconnect any accessories attached to the device
    5. Verify battery contacts, inspect for corrosion / clean contacts
  1. Has the device lost battery power for more than 2 minutes, unit will clear memory after 2 minutes with no battery power.
  2. Has more than 2 minutes of data been recorded.
  3. Unit must have 6 new good batteries (no flashing displays), good sensor reading 2 minutes or more.
  • Unit will not display readings:
    1. Verify that only Nonin accessories are being used
    2. Verify integrity of all batteries, is display blinking
    3. Try another sensor
    4. If 8500I is being used, remove and try again using only the sensor.
    5. Verify that tester \ patient is not wearing fingernail polish
  • Unit is displaying erratic readings
    1. Follow steps in item #2 above
  • Numeric displays blink at one-second intervals (Low Battery Indication)
    1. Install six new batteries
    2. Verify correct installation (polarity) of ALL batteries (FIGURE 2)

Nonin 8500 – Battery Placement Configurations

Battery installation (6) – Left to Right – #1, #3, #5

                                                                #2, #4, #6





Location: Reverse (5 other batteries correct polarity)

#1 – Will power ON, Blinking Display HR and SPO2, will provide readings, but blink

#2 – Will power ON, Blinking Display HR and SPO2, will provide readings, but blink

#3 – Will power ON, Blinking Display HR and SPO2, will provide readings, but blink

#4 – Will power ON, Blinking Display HR and SPO2, will provide readings, but blink

#5 – Will power ON, Blinking Display HR and SPO2, will provide readings, but blink

#6 – Will power ON, Blinking Display HR and SPO2, will provide readings, but blink

* Any two batteries reversed grouped together, No Power (1 – 2 or 3 – 4 or 5 – 6)

* Any two batteries, not grouped together, will power ON, only dashes no readings.

* Three batteries reversed, no power, no indications.


Frequently Asked Questions

What is included in the 8500 package assembly?

  • 8500 Pulse Oximeter
  • 8500 Operator’s Manual on CD
  • 8000AA Pulse Oximeter Sensor
  • 6 AA-Size Alkaline Batteries

How do you know you’re getting an accurate reading?

The tricolor LED display (m) 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, and red indicates an inadequate
pulse signal. Allow the 8500 to stabilize, observing about 10 seconds
of continuous green-colored pulse quality before relying on the
displayed values. It is common for the displayed values to fluctuate
slightly over a period of several seconds. If the pulse quality display
blinks yellow or red, try another finger.

What kind of battery is used in the 8500?

Six AA Alkaline batteries.

How many hours of battery life can I expect?

Six AA alkaline batteries provide the device with approximately 100
hours of continuous operation.

How does the unit display low batteries?

When batteries are low, the numeric displays flash once per second.
Replace low batteries as soon as possible.


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