S/5 Hemodynamic modules
Document No. 800 1008-2
9
SpO sensor cable
2
6
7
4
5
8
1
9
R
C
GND
LED
GND
V
B
S
Emitter
Detector
IRED
RED
SpO sensor connector
Imax (DC-component)
Imin
Imax
Intensity of
transmitted
light
Transmitted
light
No pulsation
Pulsatile blood
AC-component
Variable absorption
due to pulse added
volume of arterial
blood
Arterial blood
Venous blood
Tissue
Time
Incident light
2
GND
I
I
Figure 2
Absorption of infrared light in the finger probe parts layout and schematic
diagram
2.1.4
Temperature
The temperature is measured by a probe whose resistance varies when the temperature changes,
called NTC (Negative Temperature Coefficient) resistor.
The resistance can be measured by two complementary methods:
•
Applying a constant voltage across the resistor and measuring the current that flows through
it
Summary of Contents for S/5 M-ESTPR
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