Dräger Savina 300, Техническая документация инструкция, Страница: 16 / 166

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Savina 300
Function descriptions
Electronic assembly
O2 Valve PCB
The O2 Valve PCB holds the pressure sensors (absolute pressure S6 and S7
and O2 supply pressure S5), the actuator for the O2 calibrating valve and the
nebulizer valve and the actuator for the valve block.
The signals of the pressure sensors are amplified and routed to the Central
Control Board. The supply voltage (+5 V) for the pressure sensors is gener-
ated by the O2 Valve PCB.
The valve block valves, the O2 calibrating valve and the nebulizer valve can
be operated separately by an electronic switch. They are actuated by the
Central Control Board.
Fig. 4 Block diagram of the O2 Valve PCB
O2 Diaphragm PCB
The O2 Diaphragm PCB amplifies the signals from the O2 sensors and mea-
sures the temperature of the O2 sensors and of the respiratory gas in the
inspiration block. The temperature of the O2 sensors is required to compen-
sate for the temperature-sensitive O2 measurements. The EEPROM on the
Central Control Board stores the calibration data of the sensors. The refer-
ence voltage for the O2 sensors is generated from the voltage of the
rechargeable batteries.
The supply voltages for the O2 Diaphragm PCB are +5 V and +15 V.
Fig. 5 O2 Diaphragm PCB block diagram