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Datex-Ohmeda S/5 Light Monitor
6
Document No. 8000060-1
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:
1.
Applying a constant voltage across the resistor and measuring the current that flows
through it.
2.
Applying a constant current through the resistor and measuring the voltage that is
generated across it.
In Datex-Ohmeda solution the two methods are combined in a form of a voltage divider. The NTC-
resistor is connected in series with a normal resistor and a constant voltage is applied across them.
The temperature dependent voltage can be detected at the junction of the resistors, thus producing
the temperature signal from the patient. The signal is amplified by analog amplifiers and further
processed by digital electronics.
2.1.5 Invasive blood pressure
To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The transducer is placed
level with the heart, and electrically zeroed.
The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor
interprets the voltage signal so that pressure data and pressure waveforms can be displayed.
2.1.6 Respiration
Impedance respiration is measured across the thorax between three ECG electrodes. The signal of
the respiration is made by supplying current between two electrodes and by measuring the
differential current from the third electrode. The input current is 200
µ
A (31 kHz). The impedance
measured is the impedance change caused by breathing. When the patient is breathing or is
ventilated, the volume of the air in the lungs changes, resulting the impedance between the
electrodes. From these impedance changes, respiration rate is calculated, and respiration
waveform is displayed on the screen.
Summary of Contents for F-LM1
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