BIRD MicroBlender 3800 User manual

E EEE
3800
MicroBlender
000
SZ
ООН 4/98 Service Mianual

ORDERING INFORMATION
Contact your Bird Products Corporation
Dealer or Bird Products Corporation
Customer Service Department directly:
1100 Bird Center Drive |
Palm Springs, CA 92262
[phone] or
[phone]
TLX: 9103805605
Fax: [phone]
O 1995 Bird Products Corporation
TECHNICAL INFORMATION
Contact Bird Products Corporation
Technical Services Department
directly:
1100 Bird Center Drive
Palm Springs, CA 92262
[phone] or
BIRD HELPLINE:
(800) 934-BIRD
[[phone]]
EŞ, ae
B
Bird Products Corporation
1100 Bird Center Drive, Palm Springs, CA 92262
[phone] yy TLX: 9103805605
[phone] yy FAX: [phone]

TABLE OF CONTENTS
SECTION 1: Oo Överiew Of The3800MicroBlenderOperation.................................... 1
SECTION 2: Warnings, Cautions and Notes nene 4
SECTION 3: Troubleshooting een 6
SECTION 4: Serice,RepairandCalibration.......................................... em 9
SECTION 5: PerformanceClheck......................................... 1. eee 32
SECTION 6: CleaningandsSterilization............................................... 33
SECTION 7: Maintenance and Service Policy ss 34
SECTION 8: Replacement Parts eee 35
SECTION 9: Product Specifications .ee 38
SECTION 10: Warranty 4 40
NOTE: This manual is intended as a guide
for the service/repair calibration of the 3800
MicroBlender by a qualified technician.

SECTION 1:
OVERVIEW OF THE 3800 MICROBLENDER OPERATION
August, 1991
The 3800 MicroBlender mixes medical
grade compressed air and oxygen to
provide a pressurized gas source ranging
from 21% to 100% oxygen.
Figure 1
The two 50 + 5 PSIG (3.52 + 0.35 kg/cm?)
gas sources enter through the diameter
indexed (DISS) air and oxygen inlet
connectors located on the bottom, rear of
the blender (Fig. 2). Each inlet connector
incorporates a 30 micron particulate filter.
After being filtered, the gases travel
through duckbill check valves which
prevent possible reverse gas flow to
either the air or oxygen supply systems.
Figure 2
m BALANCE MODULE (FIGURE 3)
The two gases then enter the two-stage
Balance Module. The purpose of this mod-
ule is to equalize the operating pressure of
the air and oxygen gas sources before
entering the Proportioning Module. The
diaphragm responds to the difference in
pressure and directs the movement (stroke)
of each ball valve assembly contained
within the air and oxygen chambers. The
movement of each bail valve adjusts the
amount of gas flowing through the Balance
Module, equalizing the air and oxygen
pressures to the lower of the two pressures.
MODULES
BALANCE
MODULE
PROPOR-
TIONING
MODULE
ALARM BYPASS |
GAS SUPPLY PROPORTIONING/BLEED
SECTION SECTION
Figure 3, Bird Air-Oxygen Blender Diagram
m PROPORTIONING MODULE (FIGURE 4)
From the Balance Module the gases flow
into the Proportioning Module and are
mixed according to the oxygen percentage
selected on the external control knob. This
Module consists of a double ended valve
positioned between two vaive seats.
一 1 一

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.
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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

The gas with the higher pressure will also flow
directly to the blender outlet port bypassing
the Balance and Proportioning Modules. The
gas is also directed to the bottom of the unit to
the reed alarm, thus creating an audible
warning. The oxygen concentration will be
that of the gas at the higher pressure. The
blender in the alarm/bypass mode will deliver
the oxygen (100%) or air (21%) until the
bypass mechanism resets when source gas
pressure is restored to a differential of ap-
proximately 6 PSI (0.42 kg/cm’).
Some characteristics of the alarm/bypass
system on the MicroBlender differ somewhat
from those of model 3300 and other model
blenders.
If the MicroBlender is set at 21% and the
OXYGEN source pressure is reduced suffi-
ciently to produce a 20 PSI (1.41 kg/cm?) or
greater differential, the unit will not alarm
because it will continue to deliver 21% con-
centration according to the setting. If the
control is moved slightly from the 21% setting,
the alarm will sound.
Similarly, if the MicroBlender is set to deliver
100% concentration and AIR source pressure
is reduced or lost, the unit will not alarm
because it will continue to deliver the selected
100% concentration.
The MicroBlender should be disconnected
when not being used. if left connected to
source gases while not being used (i.e. no
output flow or bleed flow), the unit will not
alarm if a 20 PSI (1.41 kg/cm?) or greater
pressure differential develops. It is felt that if
the blender is not in use, an alarm under
these conditions may be an unnecessary
distraction or nuisance.
E GAS OUTLETS (FIGURE 6)
The primary gas outlet is utilized for
unmetered high flow applications in the range
of 15-120 LPM. The flow of gas is automati-
cally initiated by an attachment of a pneumatic
device to the outlet port. A check valve is
unseated upon connection allowing the mixed
gases to flow through the primary outlet.
AUXILIARY
QUILET
Figure 6
The auxiliary outlet is located on the right
side of the MicroBlender and is designed to
deliver metered gas through a flowmeter.
Mixed gas may be delivered within speci-
fied accuracy tolerance from this outlet at 2
LPM and above. When a connection is
made to the auxiliary outlet a 10-12 LPM
bleed of mixed gas to the atmosphere is
activated. This bleed is essential to ensure
accuracy of concentration for applications
utilizing low flows down to 2 LPM.

SECTION 2:
WARNINGS, CAUTIONS AND NOTES
August, 1991
The 3800 MicroBlender should be oper-
ated by trained, qualified medical person-
nel under the direct supervision of a li-
censed physician. Before clinical applica-
tion, the WARNINGS, CAUTIONS and
NOTES should be read and understood.
CAUTION: Conditions may exist that could
damage the 3800 MicroBlender or other
pieces of equipment.
WARNING:
CONDITIONS MAY EXIST THAT
COULD ADVERSELY AFFECT THE
OPERATOR OR PATIENT.
NOTE: A specific point is made to assist the
operator in its understanding.
WARNINGS:
m RESPIRABLE (MEDICAL) AIR
SHOULD MEET THE REQUIREMENTS
OF ANSI Z86.1-1973 COMMODITY
SPECIFICATION FOR AIR, TYPE 1
GRADE D OR BETTER. IT SHOULD
ALSO HAVE A DEW POINT OF 5° F
(2.75°C) OR MORE BELOW THE LOW-
EST TEMPERATURES TO WHICH THE
AIR DISTRIBUTION (PIPING) SYSTEM
IS EXPOSED. PARTICULATE (CON-
DENSED) WATER IS THE AIR SUPPLY
IS HARMFUL TO MANY MEDICAL
DEVICES UTILIZING OR CONTROL-
LING COMPRESSED AIR. FILTERS
FREQUENTLY BECOME RESTRICTED
BY DEPOSITS OF DISSOLVED SALTS
AND OTHER AIRBORNE MATTER.
WHILE COMPRESSED AIR IS TYPI-
CALLY THE MAJOR SOURCE OF
DEPOSITS, OTHER MEDICAL GASES
AND DISTRIBUTION SYSTEMS ARE
CAPABLE OF DELIVERING FILTER
RESTRICTING MATTER. THIS RE-
STRICTION OF FILTERS CAUSES
INSIDIOUS REDUCTION IN FLOW
CAPABILITY OF THE BLENDER, POS-
SIBLY STARVING A DOWNSTREAM
DEVICE SUCH AS A VENTILATOR,
CAUSING MALFUNCTION. THERE-
FORE, IT IS VERY IMPORTANT TO
PERFORM PREVENTATIVE MAINTE-
NANCE, MINIMALLY AT RECOM-
MENDED INTERVALS ON DEVICES
WITH FILTERS, ESPECIALLY IF THE
GAS SUPPLY IS NOT KNOWN TO BE
CLEAN AND/OR FREE OF CON-
DENSED WATER.
@ THE 3800 MICROBLENDER SHOULD
BE SERVICED AND/OR CALIBRATED
BY A BIRD PRODUCTS CORPORATION
TRAINED HOSPITAL/DEALER SERVICE
TECHNICIAN OR BIRD PRODUCTS
CORPORATION.
m THE MICROBLENDER IS DESIGNED
TO OPERATE FROM A 50 PSIG (3.52
kg/cm?) AIR SOURCE AND A 50 PSIG
(3.52 kg/cm?) OXYGEN SOURCE.
Ш DO NOT OCCLUDE OR OBSTRUCT
THE BLEED PORT OR MUFFLER ON
THE BOTTOM OF THE
MICROBLENDER.
@ ADJUSTMENT OF OXYGEN CON-
CENTRATIONS SHOULD BE VERIFIED
BY AN OXYGEN ANALYZER.
一 4 一