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Description of functions
Filter:
The filter protects the system from particles in the
gas delivered to the air inlet. The filter must be
replaced during the "Twelve months maintenance".
Inspiratory valve temperature sensor:
The temperature of the supplied gas is measured by
the inspiratory valve temperature sensor. This sensor
is situated in the gas flow.
The output signal from this sensor is used to
compensate for the gas density variations due to
temperature.
3
Supply pressure transducer:
The pressure of the supplied gas is measured by the
supply pressure transducer.
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.
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.
Nozzle unit:
The nozzle unit contains a valve diaphragm. The valve
diaphragm, controlled by the inspiratory solenoid,
regulates the gas flow through the G
Metal nozzle units (Type I) modified for backpressure
must be used together with a small washer that is
placed on top of the inspiratory solenoid. This washer
will support the diaphragm and distributes the
backpressure over a larger area on the diaphragm.
This function is integrated in the plastic nozzle units
(Type II) and the small washer is not used in these
G
M
.
AS
ODULES
The nozzle units are provided with a mechanical key
to prevent that the nozzle unit is mounted into wrong
G
M
.
AS
ODULE
An O-ring and the valve diaphragm (Type I) or the
complete plastic nozzle unit (Type II) must be
replaced during the "Twelve months maintenance".
After replacement, allow the diaphragm to settle
during approx. 10 minutes before gas pressure is
connected to the G
AS
3 - 8
M
.
AS
ODULE
M
.
ODULE
Siemens-Elema AB
Inspiratory solenoid:
The gas flow through the G
the inspiratory solenoid via the nozzle unit.
The current supplied to the solenoid is regulated so
that the gas module will deliver a gas flow according
to the front panel settings.
Gas module key:
The G
M
are provided with a mechanical key
AS
ODULES
to prevent that the G
M
AS
wrong slot.
The key consists of a plastic guide mounted under-
neath the G
M
and a corresponding guide
AS
ODULE
mounted on the pneumatic section base.
Safety valves
The I
C
block contains four safety
NSPIRATORY
ONTROL
valves:
• SV1 is a spring-loaded valve preset to open at 600
kPa (6 bar). Protects the vaporizers in case of
failure in G
M
AIR (N
AS
ODULES
• SV2 is a magnetic valve preset to open at 14 kPa
(140 mbar). Will release overpressures created in
the B
-I
-B
, e. g. if the patient is coughing.
AG
N
OTTLE
Will also protect the B
AG
in the G
M
D
AS
ODULE
RIVE
• SV3 is a magnetic valve preset to open at 18 kPa
(180 mbar). Protects the F
C
and the I
ONTAINER
NSPIRATORY
• SV4 is a magnetic valve preset to open at 14 kPa
(140 mbar). Protects the patient from high pressure
in the fresh gas.
• SV8 is a magnetic valve preset to open at -3.5 kPa
(-35 mbar). Protects the pressure transducers from
negative pressures created during use of closed
suction catheter systems.
The magnetic valves (SV2 – SV4 and SV 8) contain a
permanent magnet that affects the metal valve cone.
The distance between the magnet and the valve cone
is preset to open the valve when the pressure limit is
reached.
Do not cover the visable hole in the center of valves
SV2 – SV4. If this hole is covered, the valve will not
open.
KION / KION-i
M
is regulated by
AS
ODULE
is mounted in the
ODULE
O) – BP or O
– BP.
2
2
-I
-B
in case of failure
N
OTTLE
G
AIR (O
).
AS
2
G
P
RESH
AS
RESSURE
F
G
V
.
RESH
AS
ALVE
E382 E392E 061 01 02 02
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