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Principles of Operation
Rev. 02
Description
This manual is written for users of the Novametrix Model 515B or 515C Pulse Oximeter. The
Model 515B/C provides reliable continuous measurement, display, and alerts for oxygen
saturation (SpO
) and pulse rate. The monitor can be powered from its rechargeable internal
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battery or from the AC Mains.
The Model 515B/C measures oxygen saturation using sensors that contain red and infrared (660
and 940 nanometer) light sources, called LEDs. The light energy from each LED is beamed
through a sample cell—a pulsating vascular bed, the patient's finger or toe for example. The
remaining light energy not absorbed by the sample cell reaches a light receptor in the sensor,
called a photodiode. Oxygen saturated blood absorbs different amounts of light at each
wavelength as compared to unsaturated blood. Therefore, the amount of light absorbed by the
blood in each pulse can be used to calculate oxygen saturation.
The Model 515B/C is calibrated to display "functional" saturation. This differs from the
"fractional" saturation value displayed by most co-oximeters. Functional saturation is defined
as:
Functional Saturation =
This can be considered to represent the amount of oxyhemoglobin as a percentage of the
hemoglobin that can be oxygenated. Dysfunctional hemoglobins (COHb and METHb) are not
included in the measurement of functional saturation.
Pulse Rate is calculated by measuring the time interval between peaks of the infrared light
waveform. The inverse of this measurement is displayed as pulse rate.
The oxygen saturation and pulse rate values are updated once each second. Presence of a pulse
is indicated visibly by a bar graph display, a plethysmogram graphic display (Model 515C only),
and audibly by a "beep."
The Model 515B/C must be used in conjunction with SuperBright™ Sensors. See
"Accessories" on page 43 for a list of available sensors and accessories.
100 - (COHb + METHb)
HbO
= Fractional Hemoglobin
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COHb = Carboxyhemoglobin
METHb = Methemoglobin
HbO
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Model 515B/C
User's Manual
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