Dräger Medical Zeus, Техническая документация инструкция

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Function Description Zeus
The PCB the CS and reserve gas cylinder pressure sensor signals and con-
trols the 8 indicator LEDs on the control panel of the main monitor. As long as
the mains power is present, the 8 LEDs are supplied with a permanent 24 V
(ULED). This means display can be maintained even when the unit is
switched off.
The operating voltage for the sensors (12 V) and the processor system (5 V)
is derived from the supply voltage. The input voltage is monitored by the con-
troller.
The CS-pressure sensors operate in the range from 0 to 10 bar, delivering
output voltages of 0.2 to 4.8 V which are routed by way of a multiplexer to the
A/D-converter. The high pressure sensors have an additional 4 to 20 mA
interface. The current signal is converted into a voltage of 0.2 to 4.8 V and
likewise routed by way of a multiplexer to the A/D-converter.
The microcontroller reads in the pressure sensor signals and transfers the
data as a CAN-object onto the CAN-bus. The CAN-bus is isolated by opto-
coupler from the rest of the system. A green status-LED indicates the status
of the data transfer to the CAN-bus. A yellow status-LED is permanently lit
when the system is working properly and flashes in the event of an error. The
signals to activate the 8 LEDs on the control panel of the main monitor are
transmitted over the SPI bus.
AN NTC on the PCB determines the ambient temperature in the vicinity of the
CS Block PCB.
4.3 DAGMAR mixed gas
metering unit
4.3.1 Purpose The DAGMAR (Digital Advanced Gas Mixer for Anaesthesia Requirements)
mixed gas metering unit is a digital mixer and metering unit. The mixer and
metering unit comprises the DAGMAR valve block and the DAGMAR PCB. It
performs the following tasks:
– Digital mixing and metering of oxygen and either nitrous oxide or com-
pressed air
4.3.2 DAGMAR valve block The Dagmar valve block is divided into two separate branches ( Figure 11 ).