BIRD MicroBlender 3800 - Page 8

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OVERVIEW

OF

THE

3800

MICROBLENDER

OPERATION

One

valve

seat

controls

the

passage

of

air

and

the

other

valve

seat

controls

the

pas-

sage

of

oxygen

into

the

MicroBlender

outlet.

At

this

point,

the

two

gases

have

been

blended

according

to

the

oxygen

percentage

selected

on

the

MicroBlender

control

knob.

Αι

"OUTLET

45

PSI

50%

O,

Figure

4

With

the

control

knob

at

the

full

counter-

clockwise

position

(21%),

the

double

ended

valve

will

completely

close

off

the

flow

of

oxygen,

allowing

only

the

air

to

flow.

By

adjusting

the

control

knob

in

the

full

clock-

wise

(100%)

position

the

flow

of

air

is

blocked,

permitting

only

the

flow

of

oxygen

through

the

blender

outlet.

m

ALARM/BYPASS

(FIGURE

5)

The

alarm

feature

provides

for

an

audible

alarm

if

source

pressures

differ

by

20

PSI

(1.41

kg/cm?)

or

more.

The

primary

purpose

of

the

alarm

is

to

audibly

warn

the

operator

of

an

excessive

pressure

drop

or

depletion

of

either

source

gas.

The

alarm

will

also

activate

in

the

event

of

elevation

of

either

source

gas

when

a

difference

of

20

PSI

(1.41

kg/cm?)

or

more

is

detected.

Should

both

gas

pressures

(oxygen

or

medical

air)

increase

or

decrease

simulta-

neously,

and

a

20

PSI

(1.41

kg/cm?)

differ-

ential

is

not

seen,

there

will

not

be

an

au-

dible

alarm.

If

either

source

gas

pressure

drops,

the

output

pressure

of

the

blender

will

drop

similarly,

since

the

source

gases

are

always

balanced

to

that

of

the

lower

pressure.

The

bypass

function

operates

in

unison

with

the

alarm.

The

alarm

bypass

poppet

com-

municates

directly

with

the

air

supply

on

one

end

and

the

oxygen

supply

on

the

other.

TT

Y

©

|

_

©

À

\

O

ry

“A

è

13

A

=

η

D

\

СС

Ars

Е:

(Gz:

ES7

O,

OPS!

ALARM

AIR

50PSI

AIR

Figure

5

When

the

two

source

gases

are

near

equal

in

pressure,

the

alarm

bypass

poppet

is

posi-

tioned

over

the

bypass

channel,

blocking

the

flow

of

both

gases.

The

poppet

will

remain

seated

for

unequal

pressures

up

to

20

PSI

(1.41

kg/cm’).

Once

a

20

PSI

(1.41

kg/cm?)

difference

is

sensed

by

the

poppet,

the

higher

gas

pressure

will

overcome

the

spring

force

and

pressure

at

its

opposite

end,

thus

creating

a

path

for

gas

(air

or

oxygen)

to

flow

into

the

alarm

channel.

一

2

一

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