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Respironics Millennium - 3.4 Theory of Operation; 3.4.1 Pneumatic Operation

Respironics Millennium
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RESPIRÓNICS"
Chapter
3:
Specifications,
Description,
Features,
&
Theory
of
Operation
3.4
Theory
of
Operation
The
Millennium
Oxygen
Concentrator
System
(Millennium)
sup-
ports
patients
and
health
care
providers
in
producing
highly
concen-
trated
oxygen
for
therapeutic
breathing
purposes.
Air
we
breath
is
normally
a
mixture
of
21%
oxygen,
78%
nitrogen,
and
1%
argon
and
other
gases.
Millennium
uses
a
compressor
and
molecular
sieve
to
remove
nitrogen
from
the
air.
The
concentrated
oxygen
exits
the
DISS
Outlet
fitting
to
the
user.
3.4.1
Pneumatic
Operation
Refer
to
Figure
3-5
while
reading
the
following
discussion.
The
room
air
enters
the
unit
through
an
inlet
filter
mounted
on
the
side
of
the
cabinet.
The
primary
system
air
is
drawn
through
a
foam
air
inlet
filter
(1)
mounted
on
the
side
of
the
cabinet.
The
primary
system
air
is
drawn
through
the
inlet
pre-filter
(2)
and
then
through
the
inlet
filter
(3)
by
the
compressor
(4).
The
exhaust
air
then
passes
through
the
in-line
muffler
(5)
to
the
supply
chamber.
The
compressor
exhaust
air
is
cooled
by
the
supply
chamber
(6)
and
distributed
using
an
SMC
pneumatic
valve/solenoid
assembly
(7).
At
start
up,
valve
(7)
is
de-energized
allowing
compressed
air
to
flow
into
both
sieve
canisters
(8)
until
the
pressure
sensor
builds up
to
switching
pressure.
At
switching
pressure,
a
12
volt
signal
is
received
at
valve/solenoid
(7a)
closing
the
input
and
allowing
compressed
air
to
continue
through
sieve
bed
(8a)
for
6.25
seconds
absorbing
the
Nitrogen
and
allowing
the
Oxygen
to
flow
through
check
valve
(9a)
and
into
the
product
tank
(10).
At
5
liters
of
flow
(4
liters
international)
approximately
1/3
of
the
Oxygen
is
deposited
into
the
product
tank
and
2/3
is
passed
through
orifice
(11)
in
to
sieve
bed
(8b)
to
purge
the
Nitrogen
from
the
sieve
bed,
which
exits
through
the
exhaust
port
of
the
valve/solenoid
(7b)
to
exhaust
chamber
(13)
through
blow
down
muffler
(14)
to
outside
air
in
a
time
of
6.25
seconds.
-
At
the
end
of
this
cycle
the
unit
will
balance
for
1
second
which
de-
energizes
valve
/
solenoid
(7b)
and
allows
compressed
air
to
flow
into
both
sieve
canisters.
The
pressure
reaches
the
max
switching
pressure
and sends
a
12
volt
signal
to
valve
/
solenoid
(7b)
and
the
adsorption
cycle
starts
over
in
the
sieve
canister
(8b).
Oxygen
is
in
a
continuous
flow
from
the
product
can
(10)
through
the
regulator
(15)
through
the
flow
meter
(16)
to
the
bacteria
filter
(17)
to
the
patient.
1002403
Millennium
Oxygen
Concentrator
System
Service
Manual
3-10

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