48
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 beats per minute (BPM)
CO
2
Range
0 to >75mmHg
CO
2
Response Time
250 ms
Respiration Rate Range
1 to 60 breaths per minute
Breath Detection Threshold
5 mmHg
Accuracy – Sensors
Declared accuracy data for compatible sensors can be
found in Nonin’s Sensor Accuracy document.
CO
2
Accuracy of Bar Graph Thresholds (A
rms
)*
±25% of reading (typical)
Measurement Wavelengths and Output Power**
Red: 660 nanometers @ 0.8 mW max. avg.
Infrared: 910 nanometers @ 1.2 mW max. avg.
Alarm Volume Range:
70 – 71 dBA
Indicators
Pulse Quality Indicator: LED, tricolor
Numeric Displays: 3-digit, 7-segment LEDs, tricolor
CO
2
Bar Graph: 8-segment bar graph, red
Low Battery Indicator: Dedicated icon, yellow
No Breath Indicator: Dedicated icon, red
“Audible Alarm Disabled” Indicator: Dedicated icon, yellow
Audible Indicator: Miniature speaker
Temperature
Operating: 0 °C to +40 °C (32 °F to +104 °F)
Storage/Transportation: -40 °C to +70 °C (-40 °F to +158 °F)
* ±1 A
rms
represents approximately 68% of measurements at zero bias.
** This information is especially useful for clinicians performing photodynamic therapy.