35
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 321 pulses per minute (BPM)
Displays:
Pulse Quality: LED, amber
Sensor Alarm: LED, amber
Pulse Strength Bargraph: LED, bargraph, tri-color segments
Alarm Indicator: LED, bi-color
Alarm Silenced: LED, amber
Numeric Displays: 3-digit, 7-segment LEDs, green
Low Battery: LED, amber
SpO
2
Accuracy (A
rms
)
a
:
FO Sensor: 70-100% ± 2 digits
Pulse Rate Accuracy (A
rms
)
a
:
No Motion: ±3 digits, 18-300 BPM
Low Perfusion: ±3 digits, 40-240 BPM
Alarm Volume:
High:
Low:
75 dBA
64 dBA
Informational Tone Volume:
High:
Low:
30 dBA
26 dBA
Measurement Wavelengths and Output Power:
b
Red: 660 nm @ 0.8 mW maximum average
Infrared: 910 nm @ 1.2 mW maximum average
Memory:
70 hours (assuming continuous operation)
Temperature (Operating):
0 to 40 °C (32 to 104 °F)
Temperature (Storage/Transportation): -40 to 70 °C (-40 to 158 °F)
Humidity (Operating):
10 to 90% noncondensing
Humidity (Storage/Transportation): 10 to 95% noncondensing
a. ±1 A
rms
represents approximately 68% of measurements at zero bias.
b. This information is especially useful for clinicians performing photodynamic therapy.