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Servo...
Patient unit
Inspiratory section
Functional Main Blocks diagram marking: "I"
The main block I
NSPIRATORY
breathing gas from its gas inlets for Air and O
to the patient breathing system. It comprises the
following main functions:
• G
M
– A
O
AS
ODULES
IR AND
• C
M
.
ONNECTOR
UFF
• I
P
.
NSPIRATORY
IPE
• O
C
.
ELL
2
• T
S
.
EMPERATURE
ENSOR
• I
P
T
NSPIRATORY
RESSURE
UBE
• S
V
.
AFETY
ALVE
• I
O
.
NSPIRATORY
UTLET
• PC 1780 P
B
NEUMATIC
ACK
Gas modules – Air and O
The Air and O
G
M
AS
ODULES
2
gas flow and gas mixture.
4
5
6
1. Filter
2. Inspiratory valve temperature sensor
3. Supply pressure transducer
4. Flow transducer (Delta pressure transducer and net)
5. Nozzle unit with valve diaphragm
6. Inspiratory solenoid
The G
M
are factory calibrated. Each G
AS
ODULES
M
must not be disassembled further than
ODULE
described in chapter "Preventive maintenance".
E382 E407E 061 01 01 02
S
conveys the
ECTION
supply
2
.
2
.
-P
.
LANE
2
regulates the inspiratory
2
3
1
AS
Siemens-Elema AB
Gas inlet
The gas inlet nipples are quick-couplings where gas
supply is connected to the ventilator. The design of
the inlet nipples and their color markings vary
according to the standard chosen.
Gas is to be connected from hospital central gas
supply or from gas cylinders. The Air supply may be
connected from a compressor for medical air.
Filter
The F
protects the ventilator from particles in the
ILTER
gas delivered to the G
M
AS
replaced during the "Preventive maintenance".
The filter housing and the filter cover are provided
with matching guide pins. These guide pins prevent
mounting of the filter cover (with gas inlet nipple) on
the wrong module.
A non-return valve for the gas inlet is located in the
filter cover. This valve will suppress short pressure
drops in the gas supply.
The non-return valve is also designed to slowly
evacuate compressed gas from the module, if the gas
supply to the module is disconnected.
Inspiratory valve temperature sensor
The temperature of the supplied gas is measured by
the I
V
T
NSPIRATORY
ALVE
EMPERATURE
is situated in the gas flow.
The output signal from this sensor is used to
compensate for the gas density variations due to
temperature.
Supply pressure transducer
The pressure of the supplied gas is measured by the
S
P
T
UPPLY
RESSURE
RANSDUCER
The output signal from this transducer is amplified. It
is then used to calculate the absolute pressure of the
gas to compensate for gas density variations due to
pressure.
Flow transducer
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.
Description of functions
. The filter must be
ODULES
S
. This sensor
ENSOR
.
3 - 3
3
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