GE S5 Owners Manual

Patient Side Module, E-PSM, E-PSMP (Rev. 01) 5
Document no. M1215098-002
1.2.4 Temperature
Measurement range10 to 45 °C (50 to 113 °F)
Measurement accuracy ±0.1 °C (25 to 45.0 °C)
±0.2 °C (10 to 24.9 °C)
Display resolution 0.1 °C (0.1 °F)
Temperature test automatic (every 10 min.)
Probe type compatible with YSI 400 series
Single use sensors  ±0.3 °C (25 to 45.0 °C)
±0.4 °C (10 to 24.9 °C)
1.2.5 Invasive blood pressure
Measurement range -40 to 320 mmHg
Measurement accuracy ±5% or ±2 mmHg 
Zero adjustment...

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1.3 Technical specifications
1.3.1 NIBP
Deflation rate, PR dep.3 to 8 mmHg/s
Inflation time 20 to 185 mmHg, 1 to 5 s
Automatic software control,  max. inflation pressure
adult 280 ±10 mmHg
child 200 ±10 mmHg
infant 145 ±5 mmHg    
Over pressure limit, stops measurement after 2 seconds adult 320 mmHg
child 220 mmHg
infant 160 mmHg
The safety circuit limits the maximum cuff pressure  to 320 mmHg in adult/child mode or to 160 
mmHg in infant mode. Independent timing...

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1.3.5 Invasive blood pressure
Digital display averaging
Digital displays Art and P1 are averaged over 5 seconds and updated at 5 seconds intervals. All 
other pressures have respiration artifact rejection.
Accuracy ±5% or ±2 mmHg, whichever is greater
Transducer and input sensitivity 5 µV/V/mmHg
Filter 0 to 4 - 22 Hz adjustable
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time less than 15 s
Protection against...

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2 Functional description
2.1 Measurement principle
2.1.1 NIBP
NIBP (Non-Invasive Blood Pressure) is an indirect method for measuring blood pressure.
The NIBP measurement is performed according to the oscillometric measuring principle. The 
cuff is inflated with a pressure slightly higher than the presumed systolic pressure, and deflated 
at a speed based on the patient’s pulse, collecting data from the oscillations caused by the 
pulsating artery. Based on these...

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The modern pulse oximeters are empirically calibrated either against fractional saturation 
SaO
2frac; Formula 1
or against functional saturation SaO
2func;
Formula 2
Functional saturation is more insensitive to changes of carboxyhemoglobin and 
methemoglobin concentrations in blood.
The oxygen saturation percentage SpO
2 measured by the module is calibrated against 
functional saturation SaO
2func. The advantage of this method is...

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Figure 3 Pulse oximetry probe parts layout and schematic diagram
The standard probe is a finger clamp probe which contains the light source LEDs in one half 
and the photodiode detector in the other half. Different kinds of probes are available from GE 
Healthcare.
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...

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Document no. M1215098-002
2.1.6 Respiration
Impedance respiration is measured across the thorax between ECG electrodes. The respiration 
signal is made by supplying current between the electrodes and by measuring the differential 
current from the electrodes. The signal measured is the impedance change caused by 
breathing. The respiration rate is calculated from these impedance changes, and the 
respiration waveform is displayed on the screen. 
2.2 Main...

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2.2.2 NIBP board 
Figure 5 NIBP board functional block diagram
Signal processing
Two signals from the pressure transducers are amplified and sent to the A/D converter. After 
the converter, digitized signals are sent to the microprocessor for data processing.
The NIBP board is controlled with an H8/3052 microprocessor  at 16 MHz oscillator frequency.
Memory
The NIBP program memory (processor flash me mory) size is 512k x 8. The processor has 
4 kBytes RAM and there...

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Software control
The software controls valves and a pump. In addi tion to the individual on/off signals for each 
component there is a common power switch for the valves and the pump that can be used at 
pump/valve failures.
In addition to external RS485 reset line, the  microprocessor system is equipped with its own 
power-up reset. See the section in the ECG  board’s description: “RS485 communication.”
Safety circuit
The NIBP...

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Figure 6 NIBP pneumatics diagram
Power supply section of the NIBP board
All connections are established via a 5-pin connector (female). The module needs a +15 V (dirty) 
power supply to operate. The supply voltage Vmod 13.8- 16 V is generated in the power supply 
section of the monitor. The other voltages nee ded for the operation of the NIBP measurement 
are made on the NIBP board.
The NIBP power supply synchronizes the ECG and STP isolation power and supplies...