39
Technical Information
Principles of Operation
Pulse oximetry is a non-invasive method that passes red and infrared light through perfused tissue
and detects the fluctuating signals caused by arterial pulses. Well-oxygenated blood is bright red,
while poorly oxygenated blood is dark red. The pulse oximeter determines functional oxygen
saturation of arterial hemoglobin (SpO
2
) from this color difference by measuring the ratio of
absorbed red and infrared light as volume fluctuates with each pulse.
Specifications
Oxygen Saturation Display Range
0 to 100% SpO
2
Pulse Rate Display Range
18 to 450 beats per minute (BPM)
Saturation Declared Accuracy (A
rms
)*
70 - 100% ±3 digits for the Model 2000SL, 2000SA, and
2000T sensors.
Below 70% is not specified for all sensors.
Pulse Rate Declared Accuracy
±3% ±3 digits
Alarm Volume:
High: 70 dBA
Low: 55 dBA
Informational Tone Volume:
High: 65 dBA
Low: 45 dBA
Measurement Wavelengths and Output Power**
Red: 660 nanometers @ 0.8 mW maximum average
Infrared: 910 nanometers @ 1.2 mW maximum average
Indicators:
Pulse Quality: LED, tricolor
Numeric Displays: 3-digit 7-segment LEDs, red
Low Battery: LED, amber
Alarm Bar: LED, bicolor
Alarm Silence: LED, amber
Temperature (Operating):
-20 to +50 °C (-4 to +122 °F)
Temperature (Storage/Transportation): -40 to +70 °C (-40 to +158 °F)
Humidity (Operating):
10 to 95% noncondensing
Humidity (Storage/Transportation): 10 to 95% noncondensing
Altitude (Operating):
Up to 4,000 meters (13,123 feet)
Altitude (Hyperbaric Pressure): Up to 4 atmospheres
Power Requirements:
Four 1.5V AA-size alkaline batteries (60 hours typical
operation)
NiMH rechargeable battery pack (40 hours typical operation)
* ± 1 A
rms
represents approximately 68% of measurements at zero bias.
** This information is especially useful for clinicians performing photodynamic therapy.
