2
Servo Ventilator 300/300A
Description of functions
E382 E380E 061 01 03 01
Siemens-Elema AB
63
8.7 Inspiratory solenoid with
position sensor
The gas flow through the
INSPIRATORY
VALVE
UNIT
is regulated by the
INSPIRATORY
SOLENOID
via the 8.6
NOZZLE
UNIT
.
The solenoid receives power from the block
8.22
CURRENT
POWER
. The current supplied to
the solenoid is regulated so that the
inspiratory valve unit will deliver a gas flow
according to the front panel settings.
An optical sensor on the board PC 1593
POSITION
SENSOR
I
mounted at the bottom of
the inspiratory solenoid detects its position
and the resulting
INSP
.
VALVE
POSITION
signal is
used in the block 8.20
POSITION
PD
CONTROL
.
8.8 Valve code transponder
The inspiratory valve units are provided with
an electrical code that states the valve type
(AIR, O
2
, etc). This valve type information is
transmitted back via the 15
VALVE
CONTROL
to
the 7.1
MIXER
CPU
if required by the 7.1
MIXER
CPU
.
The
VALVE
CODE
TRANSPONDER
handles this
serial communication between the inspi-
ratory valve unit and the 7.1
MIXER
CPU
.
8.9 Inspiratory valve key
The inspiratory valve units are provided with
a mechanical key,
INSPIRATORY
VALVE
KEY
, to
prevent that the inspiratory valve unit is
mounted in the wrong slot.
The valve key consists of a plastic guide
mounted underneath the inspiratory valve
unit and a corresponding guide mounted on
the pneumatic section base.
8.3 Inspiratory valve temperature
sensor
The temperature of the supplied gas is
measured by the
INSPIRATORY
VALVE
TEMPERATURE
SENSOR
. This sensor is a part of
PC 1637 and it is situated in the gas flow.
The output signal from this sensor is used in
8.13
DELTA
PRESSURE
AMPLIFIER
to compensate
for gas temperature variations.
8.4 Supply pressure transducer
The pressure of the supplied gas is
measured by the
SUPPLY
PRESSURE
TRANSDUCER
.
The output signal from this transducer is
amplified in 8.10
PRESSURE
AMPLIFIER
and then
used in 8.11
PRESSURE
CALCULATOR
to calculate
the absolute pressure of the gas.
8.5 Delta pressure transducer
and net
The gas flows through a net (resistance)
which causes a pressure drop. The pressure
is measured on both sides of this net and
the differential pressure value is then
amplified in 8.13
DELTA
PRESSURE
AMPLIFIER
.
8.6 Nozzle unit
The
NOZZLE
UNIT
contains an O-ring and a
valve diaphragm. The valve diaphragm,
controlled by the 8.7
INSPIRATORY
SOLENOID
,
regulates the gas flow through the
inspiratory valve unit.
Service interval 3000 h of operation for
exchange of the valve diaphragm and O-ring.
After replacement, allow the diaphragm to
settle during approx. 10 minutes before gas
pressure is connected to the inspiratory
valve unit.
Содержание Servo Ventilator 300
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