Ohio Medical l-4-2-3-96-service-manual-for-amvex-120hl-high-low-flow-air-o2-blender O2 Blender Service Manual

L 4.2.3-96 Rev 2

120H/L High-Low

Flow Air/O2 Blender

Service Manual

L 4.2.3-96 Rev 2; Revised 2020-09 ©Copyright 2017 Tenacore Holdings, Inc.

Contact Us for Product Assistance

.Tenacore Holdings Inc.
1525 E. Edinger Avenue
Santa Ana, CA 92705
USA
Tel: [phone]
Fax: [phone]
www.tenacore.com

Distributed by Ohio Medical
1111 Lakeside Drive
Gurnee, IL 60031
www.ohiomedical.com

866.549.6446

L 4.2.3-96 Rev 2

AMVEX 120H/L HIGH-LOW AIR/O2 BLENDER SERVICE MANUAL

TABLE OF CONTENTS

SECTION 1: Introduction……………………………………………………………………………………….01

SECTION 2: Overview of the 120H/L High-Low Flow Air/Oxygen Blender Operation……………………...02

SECTION 3: Warnings, Cautions & Notes……………………………………………………………………...05

SECTION 4: Setup Procedure…………………………………………………………………………………...07

SECTION 5: Performance Checks…………………………………………………………………..………......08

SECTION 6: Service and Repair…………...……………………………………………………………………09

SECTION 7: Calibration………………………………………………………………………………………...24

SECTION 8: Cleaning & Sterilization…..………………………………………………………………………29

SECTION 9: Maintenance & Service Policy………………………………………………………………........30

SECTION 10: Disposal Instructions…………………………………………………………………………….31

SECTION 11: Replacement Parts….……………………………………………………………...………….....32

SECTION 12: Product Specifications..…………………………………………………………...……………..35

SECTION 13: Troubleshooting………………………………………………………………………………….37

SECTION 14: Warranty………………………………………………………………………………………....39

NOTE: This manual is intended as a guide

for the servicing and calibration of the
120H/L High- Low Flow Air/O2 Blender.

Page 1 of 40

L 4.2.3-96 Rev 2

SECTION 1:
INTRODUCTION

The Amvex 120H/L High-Low Flow Air/Oxygen Blenders are intended for non-invasive mixing and
delivery of a ratio of medical air and medical oxygen as stand-alone devices or as components of a
respiratory support apparatus implemented by trained medical professionals. The main body of the
device is constructed of aluminum, and primary flow channels are contained within or between the
aluminum pieces. Various internal components that are or can be in contact with the gas or gases
include diaphragms, o-rings, check valves, and foam filters. All components are safe for oxygen use.

The Amvex 120H/L High-Low Flow Air/Oxygen Blender can be used in conjunction with:

• Blender Wall Mount

• Blender Mount with Pole Clamp

• Blender Mount with Eclipse® or Fairfield® Equipment Rail Bracket

• Blender Mount with Unimount® Equipment Rail Bracket

• Blender Water Trap with Two 90-Degree Fittings

• Medical Gas Hose

INDICATIONS FOR USE:

The Amvex 120H/L High-Low Flow Air/Oxygen Blender is intended to deliver air and
oxygen with a respiratory setting. Oxygen concentrations can be adjusted from 21% to 100%.
The blender is designed to operate from a 50 PSIG (3.52kg/cm2) air source and a 50 PSIG
(3.52kg/cm2) oxygen source.

Use of this device is restricted to prescription or direction by a licensed medical practitioner.

NOTE:

Remove from the packaging and inspect for damage. If there is any damage, DO NOT USE and contact
Ohio Medical (refer to “Contact Us” page).

Page 2 of 40

L 4.2.3-96 Rev 2

SECTION 2:
OVERVIEW OF THE 120H/L High-Low Flow AIR/OXYGEN BLENDER OPERATION

The 120H/L High-Low Flow Air/O2 blender mixes
medical grade compressed air and oxygen to
provide a pressurized gas source ranging from 21%
to 100% oxygen.

Figure 1

GAS INLETS (FIGURE 2)

The two 30-75 PSIG gas sources enter through the
diameter indexed (DISS) air and oxygen inlet
connectors located on the bottom, rear of the
blender. 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.

Oxygen Connector

DISS Air Connector

Figure 2

BALANCE MODULE (FIGURE 3)

The two gases then enter the two-stage Balance
Module. The purpose of this module 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 ball
valve adjusts the amount of gas flowing through
the Balance Module, equalizing the air and oxygen
pressures to the lower of the two pressures.

Figure 3

Amvex Air/O2 Blender Diagram

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 valve seats.

Page 3 of 40

L 4.2.3-96 Rev 2

SECTION 2
OVERVIEW OF THE 120H/L High-Low Flow AIR/OXYGEN BLENDER OPERATION

One valve seat controls the passage of air and the
other valve seat controls the passage of oxygen
into the 120H/L High-Low Flow Air/O2 blender
outlet. At this point, the two gases have been
blended according to the oxygen percentage
selected on the oxygen blender control knob.

(1.41Kg/cm²) differential is not seen, there will not
be an audible 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 communicates
directly with the air supply on one end and the
oxygen supply on the other.

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 clockwise (100%) position the flow of
air is blocked, permitting only the flow of oxygen
through the blender outlet.

ALARM/BYPASS (FIGURE 5)

The alarm feature provides for an audible alarm if
source pressures differ by 20 PSI (1.41 Kg/cm²) 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/cm²) or more is detected.
Should both gas pressures (oxygen of medical air)
increase or decrease simultaneously, and a 20 PSI

Figure 5

When the two source gases are near equal in
pressure, the alarm bypass poppet is positioned
over the bypass channel, blocking the flow of both
gases. The poppet will remain seated for unequal
pressures up to 20 PSI (1.41Kg/cm²). Once a 20
PSI (1.41Kg/cm²) difference is sensed by the
poppet, the higher gas pressure will overcome the
spring force and pressure the poppet at its opposite
end, thus creating a path for gas (air or oxygen) to
flow into the alarm channel. 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
approximately 6 PSI (0.42 kg/cm²).

Page 4 of 40

L 4.2.3-96 Rev 2

SECTION 2
OVERVIEW OF THE 120H/L High-Low Flow AIR/ OXYGEN BLENDER OPERATION

If the 120H/L High-Low Flow Air/O2 Blender is
set at 21% and the OXYGEN source pressure is
reduced sufficiently to produce a 20 PSI
(1.41Kg/cm²) or greater differential, the unit will
not alarm because it will continue to deliver 21%
concentration according to the setting. If the
control is moved slightly from the 21% setting, the
alarm will sound.
Similarly, if the 120H/L High-Low Flow Air/O2
Blender 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 120H/L High-Low Flow Air/O2 Blender
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 (1.41Kg/cm²) or greater pressure
differential develops. If the blender is not in use, an
alarm under these conditions may be an
unnecessary distraction or nuisance.

GAS OUTLETS (FIGURE 6 and FIGURE 7)

The primary gas outlet is utilized for unmetered
low flow applications in the range of 15-120 LPM.
The flow of gas is automatically 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.

Figure 6

Figure 7

The auxiliary outlet is located on the right side of
the 120H/L High-Low Flow Air/O2 Blender and is
designed to deliver metered gas through a
flowmeter. Mixed gas may be delivered within
specified 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 attained. The bleed flow exits
the blender through a bleed port located on the
bottom as shown in Figure 6.This bleed allows for
applications utilizing low flows down to 5 LPM.

AUXILIARY

OUTLET

PRIMARY

OUTLET

Page 5 of 40

L 4.2.3-96 Rev 2

SECTION 3:
WARNINGS, CAUTIONS & NOTES

The 120H/L High-Low Flow Air/O2 Blender should be operated by trained, qualified medical personnel under
direct supervision of a licensed physician. Before clinical application, the WARNINGS, CAUTIONS and
NOTES should be read and understood.

Safety Symbol

Content

WARNING

Indicates potential serious adverse reactions and safety hazards which if not avoided
could result in death or serious injury

CAUTION

Defines any special care to be exercised by the user for the safe and effective use of
the device and the care necessary to avoid damage to the device that may occur as a
result of use or misuse

NOTE

Provides additional information to clarify an explanation or instruction for the safe
and effective use of the device

• Use this 120H/L High-Low Flow Air/Oxygen Blender only for its Intended Use as described in

this manual.

• Identify existing conditions that could adversely affect the operator or patient.

• DO NOT use this device in an MRI environment.

• Always use medical grade gasses that meet the requirements of ANSI/CGA G7.1-2011 Grade D or

better and have a dew point of 5°F (2.75°C) or more below the lowest temperatures to which the
air distribution (piping) system is exposed.

• An air inlet filter/ water trap is recommended for use with the 120H/L High-Low Flow

Air/Oxygen Blender. Filters can become restricted in a manner that can cause insidious reduction
in the flow capability of the blender and lead to malfunction.

• DO NOT occlude or obstruct the bleed port or muffler on the bottom of the blender.

• Adjustment of oxygen concentrations must be verified using an oxygen analyzer.

• DO NOT use this 120H/L High-Low Flow Air/Oxygen Blender when the alarm is sounding.

• Use recommended lubricants sparingly as lubricant may migrate to unintended parts of the blender

and cause it to malfunction.

• The oxygen selector knob does not rotate 360 degrees. Rotating the dial beyond the endpoint

settings will damage the 120H/L High-Low Flow Air/Oxygen Blender.

WARNINGS

Page 6 of 40

L 4.2.3-96 Rev 2

SECTION 3:
WARNINGS, CAUTIONS & NOTES

• U.S. Federal law restricts this device to sale by or on the order of a licensed medical practitioner.

• DO close off gas supply sources when the 120H/L High-Low Flow Air/Oxygen Blender is not in

use and the auxiliary outlet is connected. The continuous gas bleed may drain compressed gas
tanks empty.

• Store the 120H/L High-Low Flow Air/Oxygen Blender in a clean, dry area when not in use.

• Ensure all connections are tight and leak free.

CAUTIONS

• Allow equilibration time for fractional concentration of inspired oxygen (FIO2) changes before

analyzing gas.

• Use pressure regulators that display regulated pressures.

• Compressed gas can contribute to deposits that can obstruct filters. Filters can become restricted in

a manner that can cause insidious reduction in the flow capability of the blender and lead to
malfunction. It is important to perform preventative maintenance as recommended and more
frequently if the gas supply is not known to be clean and/or free of condensed water.

NOTES

Page 7 of 40

L 4.2.3-96 Rev 2

SECTION 4
SETUP PROCEDURE

The 120H/L High-Low Flow Air/Oxygen Blender should be tested in a system which closely duplicates
the conditions of use for which the blender was designed. Illustrated below is a schematic diagram of the
system that should be used to test the 120H/L High-Low Flow Air/ Oxygen Blender.

Page 8 of 40

L 4.2.3-96 Rev 2

SECTION 5:
PERFORMANCE CHECKS

Prior to placing the 120H/L High-Low Flow
Air/O2 Blender into clinical use, always perform
the following test:

BLENDER ALARM BYPASS CHECK

BLENDER ADJUSTMENT

BLENDER RESPONSE

1. Connect 50±5 PSIG (3.52±0.35 kg/cm2)

air/oxygen source gases. Adjust control knob
to 60%. Connect flowmeter to auxiliary outlet,
set flow to 5 LPM minimum.

1. Alarm/Bypass should not activate.

2. Connect an oxygen flowmeter to auxiliary

outlet to activate auxiliary bleed and
disconnect 50PSI (3.52 kg/cm2) air source
from Blender.

NOTE: The Blender must be flowing gas for
the alarm to activate.

2. Audible alarm.

3. Reconnect 50PSI (3.52 kg/cm2) air source to

Blender.

3.Audible alarm stops. Verify oxygen concentration
(57% to 63%) with an oxygen analyzer.

4. Disconnect 50PSI (3.52 kg/cm2) oxygen

source from Blender.

4.Audible alarm.

5. Reconnect 50PSI (3.52 kg/cm2) oxygen source

to Blender.

5.Audible alarm stops. Verify oxygen concentration
(57% to 63%) with an oxygen analyzer)

6. Verify oxygen flowmeter is set at 5 LPM.

6.Oxygen analyzer should read 57% to 63% when
measured from the flowmeter outlet.

WARNINGS:

• If the 120H/L High-Low Flow Air/O2 Blender does not function as

described below. Contact Ohio Medical (Refer to “Contact Us” page).

• Do NOT use the blender until the correct performance is verified.

Page 9 of 40

L 4.2.3-96 Rev 2

31

15

6

34

32

33

31

29

35

30

29

32

PART NO. 10-0701-090002
REV.A

AMVEX

HIGH / LOW FLOW BASE ASSEMBLY

WITH DISS INLETS

35

33

34

16

6

15 31

15

6

16

32

34

33

29

31

35

32

30

29

32

15

6 1 2

14

13

12

11

13

17

13

18

19

19

6

20

21 15

36

22

23

26

37

25

23

22

35

24

33

16

34

20

6

18

15

16

3

1

32

5

39

4

40

27

41

28

5

8

7

8

9

10

38

Assembly

Drawing

120HL

High/Low

Flow

Blender

ITEM

NO.

PART NUMBER

QTY.

1 10-0700-080008

2

2 10-0700-020001

1 3 10-0700-040001

1 4 10-0700-030006

1

5 10-0700-060003

2 6 10-0700-060010

7 7 10-0702-010002

1 8 10-0700-060005

1 9 10-0700-010004

1 10 10-0700-060007

1 11 10-0700-030004

1 12 10-0700-060013

1 13 10-0700-060002

3 14 10-0700-010002

1 15 10-0700-020005

6 16 10-0700-060001

8 17 10-0700-020004

1 18 10-0700-030005

2 19 10-0700-060009

2 20 10-0700-060008

2

21 10-0700-070001

1 22 10-0700-060006

2 23 10-0700-010001

2 24 10-0700-020003

1

25 10-0700-090005

1 26 10-0700-090002

1 27 10-0700-080004

1 28 10-0700-080002

1 29 10-0700-020002

4 30 10-0700-080007

2 31 10-0700-030008

4 32 10-0700-030009

8 33 10-0700-080003

4 34 10-0700-030007

4

35 10-0700-010010

4

36 10-0700-010008

1 37 10-0700-090004

1 38 10-0700-090001

1 39 10-0701-010001

1 40 10-0701-030001

1

41 10-0701-030002

1

Page 10 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

WARNING:

THE 120H/L HIGH-LOW AIR/OXYGEN FLOW
BLENDER SHOULD BE SERVICED AND/OR
CALIBRATED BY A QUALIFIED AND
TRAINED TECHNICIAN.

CAUTION: Before attempting to service/repair

the 120H/L High-Low Air/O2 Flow Blender, the
service person should first be familiar with its design
and operation as explained in Section 1 of this
manual.

A. SERVICE/CALIBRATION TOOLS

Special tools (Figure 8) will be required for the
service disassembly and assembly of the 120H/L
High-Low Flow Blender. These products may be
obtained from Ohio Medical.

Figure 8

Additional tools and supplies recommended for
service/repair

• 5/32” Allen wrench

• 1/8” Allen wrench

• 9/32” Hex nut driver

• 5/32” Allen driver

• 1/8” Allen driver

• 3/4” Deep socket

• 11/16” Deep socket

• 3/4” Open end or adjustable wrenches (2)

• 11/16” Open end or adjustable wrench

• 7/32” Allen wrench

• Small needle nose pliers

• Torque wrench (to 120in/lb)

• 0-15 LPM Flowmeter (1/2 LPM increments)

A Maintenance Blender Kit may be ordered by
specifying DAOBA-00000-05. This kit includes all
parts necessary for periodic preventive maintenance.

Pin Wrench #TAOBA-00000-77

Alarm Tool #TAOBA-00000-78

Alignment Tool #TAOBA-00000-79

Page 11 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

1.0. BALANCING BLOCKS
DISASSEMBLY/REASSEMBLY
PROCEDURE (FIGURE 9 and 10)

• BALANCE BLOCK DISASSEMBLY

-TOP OF 120H/L High-Low Flow BLENDER

1.1 With a 5/32” Allen wrench, remove the top

four screws securing the two balance block
assemblies to the valve block.

NOTE: The balance block assemblies are
identical and interchangeable. For ease of
assembly, the blocks may be labeled.

1.2 Using the pin wrench (P/N: TAOBA-00000-

77), remove the block caps (2 each per balance
block assembly). Remove O-rings and discard.

NOTE: Poppet spring and ball will be loose
following removal of balance block cap. Remove
components and set aside.

1.3 With a 5/32” Allen wrench, remove each of

four (4) screws securing each pair of blocks.
Remove the diaphragms and O-rings and
discard.

Clean all parts with an ultrasonic cleaner.
Ensure all passages are blown completely dry
before beginning reassembly. Be sure that the
poppet seat areas are perfectly clean.

Balance block assembly replacement parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060001

8

O-Ring

10-0700-080007

2

Diaphragm

10-0700-060010

4

O-Ring

● BALANCE BLOCK REASSEMBLY

1.4 Holding Alignment Tool (P/N: TAOBA-
00000-79) in hand, place the “A” Block
diaphragm onto the alignment tool with the
diaphragm cavity facing up.

1.5 Place Balance Block Diaphragm (P/N: 10-

0700-080007) into cavity.

NOTE: Make sure poppet pin on diaphragm seats
into alignment tool.

1.6 Place “B” block on top of assembly with

diaphragm cavity facing down.

NOTE: Align block assemblies for proper gas
flow. Three holes on each block (bottom) must be
aligned.

1.2 Insert second diaphragm alignment tool into

Block “B”, making sure the poppet pin on

diaphragm seats into alignment tool.

TAOBA-00000-79

TAOBA-00000-79

10-0700-020002

10-0700-080007

10-0700-020002

A

B

Figure 9

Page 12 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

1.8 Fasten Block “A” and “B” together loosely with

two (2) 0.75” socket head cap screws (P/N 10­0700-030009).

1.9 Holding the two (2) alignment tools in place, lay
the entire assembly with one of its surfaces on a flat
surface. This will align the diaphragm blocks for
mating with proportion block.

1.10 Using a 5/32” Allen wrench, tighten the

previously installed two (2) 2.25” socket head screws
holding (P/N: 10-0700-030008) blocks “A” and “B”
together. Torque to 60 in/lb.

1.11 Install and tighten, using a 5/32” Allen wrench,

remaining two (2) 0.75” socket head screws (P/N 10­0700-030009) to opposite side of “A” and “B” block
assembly. Torque to 60 in/lb.

1.12 Remove both diaphragm alignment tools and

place “A” and “B” block assembly on its side.

1.13 Lightly lubricate O-Ring (P/N 10-0700-060010)

with lubricant and install on Balance Block Cap (P/N
10-0700-020005).

1.14 Place a very small amount of lubricant grease on
one end of spring (P/N 10-0700-030007), then install
lubricated end into balance block cap.

Figure 10

NOTE: Lubricant on spring end ensures adherence of

spring to cap during placement into block assembly.

1.15 Install block cap and spring into block
assembly and tighten in place using pin wrench
(P/N: TAOBA-00000-77).

1.16 Repeat steps 1.13 to 1.16 for the opposite side of

block assembly “AB”.

1.17 Reassemble blocks “CD” using the same

procedure for blocks “AB” beginning with step

1.4.

1.18 Lightly lubricate O-Rings (P/N 10-0700-

060001) with lubricant.

1.19 Place block assemblies and O-Rings aside of
final assembly.

2.0. OXYGEN INLET DISASSEMBLY/

REASSEMBLY-BOTTOM REAR OF 120H/L
High-Low Flow BLENDER (FIGURE 11)

NOTE: This assembly threads into the block with a

left-handed thread. A single groove on nut indicates left
hand thread.

2.1 With a 3/4” open end wrench, remove the
oxygen inlet assembly from the proportion block.

2.2 Using a second 3/4” open end wrench, separate the
O2 inlet base connector and O2 inlet center connector.

2.3 Use a 3/4” open end wrench to stabilize the O2 inlet

center connector, then remove the O2 tail piece using a

1/8” Allen wrench.

10-0700-020005

10-0700-060010

10-0700-030007

10-0700-020002

10-0700-080003

Page 13 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

2.4 Remove the filter, duckbill check valve, O-Rings

and washer and discard.
NOTE: The filter may have to be grasped with pliers

to remove.

Clean all parts with an ultrasound cleaner. Ensure all
passages are blown completely dry before beginning
reassembly.

• OXYGEN INLET REASSEMBLY
Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060012

1

O-Ring

10-0700-060010

1

O-Ring

10-0700-060004

2

O-Ring

10-0700-060014

1

Duckbill Check Valve

10-0700-040007

1

Step Washer

10-0700-080006

1

Inlet Cone Filter

Figure 10

2.5 Lightly lubricate O-Ring (P/N 10-0700-060010)

with lubricant and assemble inside of the O2 inlet
center connector (P/N 10-0700-070006).

2.6 Lightly lubricate two (2) O-Rings (P/N 10-
0700-060004) with lubricant and assemble to O2
inlet center connector (P/N 10-0700-070006) and O2
inlet base connector (P/N 10-0700-070005).

2.7 Insert duckbill check valve (P/N 10-0700-

060014), step washer (P/N 10-0700-040007) and
inlet cone filter (P/N 10-0700-080006) into O2 inlet
base connector.

NOTE: Step on washer fits into duckbill check valve.

2.7 Using two (2) 3/4” open end wrenches, tighten the

O2 inlet center connector to the O2 inlet base connector.
Torque to 120in /lbs.

2.8 Take unlubricated O-Ring (P/N 10-0700-060012)
and assemble to O2 inlet nipple (P/N: 10-0700-07008).

2.9 Insert O2 inlet nipple (P/N: 10-0700-07008)
into O2 inlet DISS nut (P/N 10-0700-070007) and

using a 1/8” Allen wrench, tighten to O2 inlet center

connector. Torque to 120 in./lbs.

2.10 Set O2 inlet aside for final assembly to proportion
block.

3.0 AIR INLET DISASSEMBLY/REASSEMBLY-

BOTTOM REAR OF 120H/L High-Low Flow
BLENDER (FIGURE 12)

3.1 With a 3/4” open end wrench, remove the air inlet
assembly with O-Ring. Remove and discard O-Ring.

3.2 Remove the inlet cone filter located in valve
block and discard.

NOTE: The filter may have to be grasped with

pliers to remove.

10-0700-060014

10-0700-060004

10-0700-040007

10-0700-070007

10-0700-070008

10-0700-080006

10-0700-070006

10-0700-060004

10-0700-060012

10-0700-070005

Page 14 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

3.3 Next, remove the washer and duckbill check

valve from the valve block assembly. Discard check
valve and washer.

Clean all parts with ultrasonic cleaner. Ensure all
passages are blown completely dry before beginning
reassembly.

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060004

1

O-Ring

10-0700-060014

1

Duckbill Check Valve

10-0700-040007

1

Washer

10-0700-080006

1

Inlet Cone Filter

● AIR INLET REASSEMBLY

Figure 12

3.4 Install lightly lubricated O-Ring (P/N 10-

0700-060004) with lubricant on air inlet connector
(P/N 10-0700-070009)

3.5 Place inlet cone filter (P/N 10-0700-080006)
inside air inlet.

3.6 Set air inlet aside with duckbill check valve
(P/N 10-0700-060014) and washer (P/N 10-0700-

040007) for final assembly to valve block.

4.0 PRIMARY OUTLET DISASSEMBLY/

REASSEMBLY-BOTTOM, FRONT OF 120H/L High­Low Flow BLENDER

4.1 With an 11/16” open end wrench, remove

the primary outlet from the valve block
assembly.

NOTE: Small spring is loose and may fall out of
cavity.

4.2 Remove poppet from primary outlet, then
remove O-Ring from poppet and discard.

4.3 Remove O-Ring from primary outlet and discard.

Clean all parts with an ultrasound cleaner and rinse
with clean, warm water. Ensure all passages are
blown completely dry and that poppet seat areas are
perfectly clean before beginning reassembly.

Replacement Parts:

● PRIMARY OUTLET REASSEMBLY

Figure 13

PART NO.

QTY.

DESCRIPTION

10-0700-060001

1

O-Ring

10-0700-060010

1

O-Ring

10-0700-060004

10-0700-070009

10-0700-040007

10-0700-080006

10-0700-060014

10-0700-060001

10-0700-070002

10-0700-030001

10-0700-060010

10-0700-070003

Page 15 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

4.4 Lightly lubricate O-Ring (P/N 10-0700-

060010) with lubricant and install on check valve
housing (P/N 10-0700-070003).

4.5 Lightly lubricate O-Ring (P/N 10-0700-

060001) on primary check valve poppet (P/N 10­0700-070002).

4.6 Insert poppet into the outlet housing.

4.7 Set assembly with spring (P/N 10-0700-030001)
aside for final assembly.

5.0 AUXILIARY OUTLET DISASSEMBLY/
REASSEMBLY-RIGHT SIDE, FRONT OF

120H/L High-Low Flow BLENDER
(FIGURE 14)

5.1 Using an 11/16” open end wrench, remove

the auxiliary outlet from the valve block
assembly.

NOTE: Small spring is loose and may fall out of
cavity.

5.2 Remove poppet from auxiliary outlet then
remove O-Ring from poppet and discard.

5.3 Remove O-Rings from auxiliary outlet
housing and discard.

Clean all parts with an ultrasonic cleaner. Ensure all
passages are blown completely dry and poppet seats
are perfectly clean before beginning reassembly.
Ensure that the orifice on Auxiliary outlet (P/N: 10­0702-070001) is not occluded.

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060001

1

O-Ring

10-0700-060010

1

O-Ring

10-0700-060004

1

O-Ring

• AUXILIARY OUTLET REASSEMBLY

Figure 14

5.4 Lightly lubricate O-Rings with lubricant.

Install lubricated O-Rings (P/N 10-0700-060004
and 10-0700-060010) on low flow auxiliary outlet
connector (P/N 10-0702-070001) and O-Ring (P/N
10-0700-060001) on auxiliary check valve (P/N
10-0700-070004).

5.5 Insert the auxiliary check valve into the auxiliary
outlet connector.

5.6 Set assembly with spring (P/N 10-0700-030002)
aside for final assembly.

● PROPORTIONING MODULE

6.0 CONTROL KNOB/ FRONT AND REAR
SEAT VALVE, DISASSEMBLY/
REASSEMBLY-FRONT OF 120H/L High-Low
Flow BLENDER

6.1 With a thin blade screwdriver, remove the knob
cover by gently separating it from the knob assembly.

6.2 Using a 9/32” nut driver, loosen the nut just

enough to remove the knob assembly from the front
seat valve stem.

10-0700-060010

10-0700-060004

10-0700-060001

10-0700-030002

10-0702-070001

10-0700-070004

Page 16 of 40

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

6.3 Using an 11/16” open end wrench, remove front

seat lock nut. Remove and discard O-Ring from front
seat locknut.

6.4 Using a thin blade screwdriver, remove the gray
cover plate by gently separating it from the block
assembly.

6.4 Using a pin wrench, remove the front seat
(incorporating valve stem).

6.5 Separate the rear valve seat from the front valve
seat. Remove and discard O-Rings.

6.6 Carefully remove poppet valve and spring from
rear valve seat.

6.7 Using a 1/8” Allen wrench, remove the rear

valve seat and O-Ring from the valve body. Remove
O-Ring from rear valve seat and discard.

Clean all parts with an ultrasonic cleaner. Ensure all
passages are blown completely dry before beginning
reassembly.

CAUTION: Valves and seats should be handled

carefully to avoid any damage.

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060010

1

O-Ring

10-0700-060005

1

O-Ring

10-0700-060003

1

O-Ring

10-0700-060007

1

O-Ring

10-0700--060011

1

O-Ring

6.8 Inspect valve seat faces carefully. They should
have a sharp edge void of chamfer, nicks or wear.
Replace as needed.

CAUTION: Any damage to valve seats may

prevent proper calibration.

6.9 Lightly lubricate O-Rings (P/N 10-0700­060010, 10-0700-060003, and 10-0700-

060005) with lubricant and install on front
valve seat (P/N 10-0701-010002).

6.10 Lubricate threads on front valve stem
(P/N 10-0701-030002) with lubricant and
carefully install front valve stem into front
valve seat. Rotate valve stem clockwise until
light contact is made with valve seat.

10-0701-030001

Figure 15

10-0700-060003

10-0700-060011

10-0700-030006

10-0701-010001

10-0700-010004

10-0700-060005

10-0701-030002

10-0701-010002

10-0700-060007

10-0700-060010

Page 17 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

6.11 Rotate front valve stem clockwise until

light contact is made with front valve seat.

CAUTION: Do NOT over tighten the front

valve stem and valve seat assembly as valve seat
damage could occur.

6.12 Set control knob (P/N 10-0700-040009), knob
cover (P/N 10-0700-040006) cover plate (P/N 10­0700-040002) , front seat assembly, spring (P/N 10­0700-030006), and O-Ring (P/N 10-0700-060007)
aside for final assembly.

7.0 BYPASS DISASSEMBLY/REASSEMBLY­BOTH SIDES, REAR OF 120H/L High-

Low Flow BLENDER (FIGURE 16)

7.1 Using a slender, pointed probe, remove
tamper resistant sticker from both side caps.

7.2 Using a 1/8” Allen wrench, unscrew the bypass
adjuster from left and right hand side bypass seats.

7.3 Remove and discard O-Ring from each
bypass adjuster.

NOTE: A small spring is contained in each

assembly and might remain in poppet bypass
valve housing after adjuster is being removed.

7.4 Using a pin wrench, unscrew bypass sleeve from
left rear side of valve block. Remove and discard O­Rings.

7.5 From right rear side of block, unscrew bypass
seat. Remove and discard O-Ring.

NOTE: If spring(s) are still in cavity, carefully
remove them.

7.6 Carefully push bypass poppet valve through
bypass sleeve.

NOTE: Use a blunt slender probe to push
poppet valve out of enclosure. Use care to
avoid scratching surface of cylinder in which
poppet valve operates.

7.7 Remove and discard O-Ring from
poppet valve.

CAUTION: Carefully inspect internal

surface of sleeve for any signs of wear and
damage to the special impregnated Teflon®
coating.

Clean all parts with an ultrasonic cleaner.
Ensure all passages are blown completely dry
before beginning reassembly.

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060006

2

O-RING

10-0700-060008

2

O-RING

10-0700-060009

2

O-RING

10-0700-060002

2

O-RING

Page 18 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

● ALARM BYPASS REASSEMBLY

Figure 16

7.8 Using lubricant, lubricate (2) O-Rings (P/N 10-

0700-060008). Install one (1) O-Ring on bypass
seat cap (P/N 10-0700-020003) and one (1) O-Ring
on alarm sleeve (P/N 10-0700-070001).

7.9 Using PFPE Oil, lightly lubricate two (2) O-
Rings (P/N 10-0700-060009) and install on alarm
sleeve (P/N 10-0700-070001).

7.10 Lightly lubricate two (2) O-Rings (P/N
10-0700-060006) and install one (1) on each
bypass adjuster (P/N 10-0700-010001).

7.11 Thoroughly lubricate two (2) O-Rings (P/N 10-
0700-060002) with lubricate grease and install one
(1) in each groove at end of alarm shuttle (P/N 10­0700-020004).

7.12 Set bypass seat assembly, alarm sleeve
assembly, bypass poppet assembly, alarm sleeve
springs (P/N 10-0700-030005) and adjuster
assemblies aside for final assembly.

8.0 OUTLET CAP DISASSEMBLY/
REASSEMBLY-LEFT SIDE, FRONT OF
120H/L High-Low Flow BLENDER

8.1 Using pin wrench, remove outlet cap and

O-Ring from valve block. Remove and discard
O-Ring.

● OUTLET CAP REASSEMBLY

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060010

1

O-RING

8.2 Lightly lubricate and install O-Ring (P/N
10-0700-060010) on block cap (P/N 10-0700-

020005). Set aside for final assembly.

9.0 MUFFLER DISASSEMBLY-BOTTOM
MIDDLE OF 120H/L High-Low Flow
BLENDER

9.1 With a small screwdriver, carefully lift star

washer from the bottom of the valve block.
Discard star washer.

9.2 Remove the muffler bleed carefully
with a pointed probe and discard.

● MUFFLER ASSEMBLY

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-080002

1

Star Washer

10-0700-080004

1

Muffler Bleed

9.3 Set muffler (P/N 10-0700-080004) and star
washer (P/N 10-0700-080002) aside for final
assembly.

10-0700-060002

10-0700-010001

10-0700-030005

10-0700-060006

10-0700-060008

10-0700-020003

10-0700-060009

10-0700-020004

10-0700-070001

Page 19 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

10.0 ALARM CAP
DISASSEMBLY/REASSEMBLY-

BOTTOM, MIDDLE OF 120H/L HIGH­LOW FLOW BLENDER (FIGURE 17)

10.1 Using blender alarm tool (P/N: TAOBA-

00000-78),unscrew alarm cap

10.2 Remove diffuser foam and discard.

10.3 Remove spring.

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-080005

1

Foam Diffuser

10-0700-040003

1

Alarm Cap

● ALARM CAP REASSEMBLY

Figure 17

10.4 Install spring (P/N 10-0700-030003) with

its wide base on top of reed inside alarm cap
(P/N 10-0700-040003).

10.5 Place foam diffuser (P/N 10-0700-080005)
into alarm cap above spring.

10.6 Check alarm assembly for proper
audible function.

10.7 Set alarm assembly aside for final assembly.

11.0 ALARM CHECK VALVE
DISASSEMBLY/REASSEMBLY-REAR OF

120H/L HIGH-LOW FLOW BLENDER
(FIGURE 18)

11.1 With pin wrench, remove block cap from
rear of valve block.

11.2 Remove and discard O-Ring from block

cap.

11.3 Using a 5/32” Allen wrench, remove

checkball retainer, rubber checkball and
spring.

11.4 Remove and discard O-Ring and
rubber checkball.

Clean all parts with an ultrasonic cleaner.
Ensure all passages are blown completely dry
before beginning reassembly.

Replacement Parts:

PART NO.

QTY.

DESCRIPTION

10-0700-060013

1

Rubber Checkball

10-0700-060002

1

O-Ring

10-0700-060008

1

O-Ring

● ALARM CHECK VALVE REASSEMBLY

Figure 18

10-0700-040003

10-0700-030003

10-0700-080005

10-0700-060013

10-0700-030004

10-0700-010002

10-0700-060002

10-0700-060008

10-0700-020005

Page 20 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

11.5 Lubricate O-Ring (P/N 10-0700-060008)
and install on block cap (P/N 10-0700-020005).

11.6 Lubricate O-Ring (P/N 10-0700-060002)

and install in groove on checkball retainer (P/N
10-0700-010002).

11.7 Inspect new rubber checkball (P/N 10-0700-

060013) to ensure that it is spotless, clean and not
damaged by scratches, nicks or flat spots, lubricate
lightly.

11.8 Set rubber checkball, checkball retainer
assembly, spring (P/N 10-0700-030004) and cap
assembly aside for final assembly.

12.0 VALVE BLOCK

12.1 Clean valve block with an ultrasonic cleaner.

Ensure all passages are blown completely dry
before assembly. Inspect for any sign of excessive
wear, damage, or any condition that may affect
proper function.

■ SEQUENCE/INDEX OF FINAL ASSEMBLY

13.0 ALARM CHECK VALVE ASSEMBLY

14.0 FRONT/REAR SEAT ASSEMBLY

15.0 ALARM BYPASS ASSEMBLY

16.0 MUFFLER

17.0 OUTLET CAP

18.0 AUXILIARY OUTLET ASSEMBLY

19.0 PRIMARY OUTLET ASSEMBLY

20.0 BALANCE BLOCK

21.0 AIR INLET ASSEMBLY

22.0 OXYGEN INLET ASSEMBLY

23.0 ALARM CAP ASSEMBLY

■ 120H/L HIGH-LOW FLOW AIR/OXYGEN
BLENDER FINAL ASSEMBLY

CAUTION: Lightly lubricate all threaded

components with the exception of the Rear Valve
Seat (P/N 10-0702-010001).

13.0 ALARM CHECK VALVE ASSEMBLY

13.1 Position Blender resting on front surface,

with rear of proportion block (P/N 10-0700-

020001) facing upwards.

13.2 Install spring (P/N 10-0700-030004);
place rubber checkball (P/N 10-0700-060013)
on spring.

13.3 Using a 5/32” Allen driver, install checkball
retainer (P/N 10-0700-010002). Verify that O­Ring (P/N 10-0700-060002) is lightly lubricated
prior to installing retainer. Torque to 30 in/lb.

13.4 Using pin wrench, install block cap (P/N 10-
0700-020005), verify O-Ring (P/N 10-0700-

060010) is lightly lubricated. Torque to 30 in/lb.

14.0 FRONT AND REAR VALVE SEAT
ASSEMBLY-FRONT OF VALVE BLOCK

14.1 Position blender with front surface facing

upwards

14.2 Install rear valve seat (P/N 10-0702-

010001) with lubricated O-Ring (P/N 10-0700-

060011) through front port.

14.3 Using a 1/8” Allen driver torque wrench,
secure rear seat in place. Torque to 25 in/lb.

Page 21 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

14.4 Lightly lubricate one end of spring (P/N 10-

0700-030006) with lubricant and insert lubricated
end into rear valve stem (P/N 10-0701-030001).

14.5 Using small, slim needle nose pliers, carefully
place rear valve stem with spring into rear valve seat
(P/N 10-0701-010001).

14.6 Verify that front valve stem is hand-tightened
until light contact is made with front seat. Place
front valve seat assembly (P/N 10-0701-010002)
into the threaded hole. With a pin wrench, exert
slight pressure and rotate COUNTER-CLOCKWISE
until initial thread engagement is found.

This initial thread engagement is very important for
the initial calibration, rotate assembly CLOCKWISE
three (3) full turns. Then rotate assembly
COUNTER-CLOCKWISE one and a half (1.5)
turns. The o-ring should not be visible.

14.7 Align the dowel pins in the front cover plate
(P/N 10-0700-040002) with the two holes in the
valve block surface. Gently push front cover plate
against blender front surface

14.8 Loosely hand fasten nut (P/N 10-0700-

010004) with wider shoulder against front plate.

NOTE: DO NOT install O-ring (P/N 10-0700-

060007) in groove at this time.

14.9 Install control knob with black pointer
against 21% O2 stop, at left side of valve
block.

15.0 ALARM BYPASS ASSEMBLY-

LEFT/RIGHT SIDE, REAR OF VALVE
BLOCK

15.1 Position blender resting on its top side.

Verify that the alarm shuttle (P/N 10-0700-

020004) with two (2) lubricated O-rings (P/N 10­0700-060002) is inside alarm sleeve.

15.2 After verifying all O-rings are lubricated,
insert assembled alarm sleeve (P/N 10-0700-

070001) into valve block. Using pin wrench,
secure alarm sleeve into valve block. Torque to
30 in/lb.

CAUTION: Be extremely careful not to

damage O-rings (P/N 10-0700-060009) during
alarm sleeve (P/N 10-0700-070001) installation.

15.3 Install one spring (P/N 10-0700-030005)
through alarm sleeve into bypass poppet
valve port.

NOTE: Ensure spring (P/N 10-0700-030005)
is positioned into alarm shuttle (P/N 10-
0700-020004).

15.4 Using an 1/8” Allen wrench, screw bypass
adjuster (P/N 10-0700-010001) with lightly
lubricated O-ring (P/N 10-0700-060006) into
alarm sleeve until bypass adjuster is slightly
recessed into alarm sleeve.

15.5 Position blender on alarm sleeve side and
install bypass seat cap (P/N 10-0700-020003)
with lubricated O-ring (P/N 10-0700-060007).
Using a pin wrench, secure seat to valve block.
Torque to 30 in/lb.

WARNING:

DO NOT PRESSURIZE THE SYSTEM UNLESS

THE FRONT VALVE SEAT HAS THREE (3)
FULL TURNS OF THE THREADS INSIDE THE
VALVE BLOCK. SEAT CAN BE
FORCEFULLY EJECTED. DO NOT EXCEED
THREE (3) FULL TURNS AS THIS MAY
DAMAGE THE REAR VALVE SEAT.

Page 22 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

15.6 Carefully insert 1/8” Allen wrench through

bypass seat cap and into alarm shuttle. Push alarm
shuttle against spring (P/N 10-0700-030001) and
check for smooth movement and recoil action.

15.7 Install spring (P/N 10-0700-030001) through
bypass seat cap (P/N 10-0700-020003) into hole in
alarm shuttle (P/N 10-0700-020004).

15.8 Using an 1/8” Allen wrench, screw bypass
adjuster screw (P/N 10-0700-010001) with
lubricated O-ring (P/N 10-0700-060006) into bypass
seat, until adjuster is slightly recessed into valve
seat.

16.0 MUFFLER ASSEMBLY-BOTTOM,
CENTER OF VALVE BLOCK (FIGURE 19)

16.1 Install one (1) muffler bleed (P/N 10-0700-

080004) into valve block bleed port.

16.2 With a small screwdriver, secure the star

washer (P/N 10-0700-080002) over the muffler
bleed.

Figure 19

17.0 OUTLET CAP-BOTTOM, FRONT OF
VALVE BLOCK

17.1 Using pin wrench, secure outlet cap (P/N 10-

0700-020005) with lightly lubricated O-ring (P/N
10-0700-060010) into valve block. Torque to 30
in/lb.

18.0 AUXILIARY OUTLET- RIGHT SIDE.
FRONT OF VALVE BLOCK

18.1 Position blender assembly on its side

(auxiliary outlet port facing up), then install
spring (P/N 10-0700-030002) into bottom of
recess in auxiliary outlet valve block port.

NOTE: Auxiliary outlet spring (P/N 10­0700-030002) is longer than primary outlet
spring (P/N 10-0700-030001).

18.2 Install auxiliary outlet connector (P/N 10-
0702-070001) and poppet into auxiliary outlet
port on valve block and hand tighten in place.

18.3Using an 11/16” open end wrench, tighten
assembly to valve block. Torque to 120 in/lb.

19.0 PRIMARY OUTLET ASSEMBLY LEFT
SIDE, FRONT OF VALVE BLOCK

19.1 Position blender assembly on its side, with

primary outlet port facing upwards. Install
primary spring (P/N 10-0700-030001) in center
of primary outlet cavity bottom.

NOTE: Primary outlet spring is shorter than
auxiliary outlet spring.

10-0700-080004

10-0700-020005
10-0700-060010

Page 23 of 39

L 4.2.3-96 Rev 2

SECTION 6:
SERVICE & REPAIR

19.2 After verifying O-rings are lubricated, install

primary check valve housing (P/N 10-0700-070003)
and poppet (P/N 10-0700-070002) into primary
outlet port on valve block and hand tighten in place.

19.3 Using 11/16” wrench, tighten assembly to

valve block. Torque to 120 in/lb.

20.0 DIAPHRAGM BLOCK ASSEMBLY-TOP
OF VALVE BLOCK

20.1 Assemble four lubricated O-rings (P/N 10-

0700-060001) each, to two diaphragm block
assemblies.

20.2 Using a 5/32” Allen wrench and a torque
wrench, secure the two diaphragm block
assemblies to the proportion block with four
screws (P/N 10-0700-030008). Tighten screws to
60 inch-pounds.

NOTE: Align diaphragm block assemblies
squarely with valve block prior to tightening in
place.

21.0 AIR INLET ASSEMBLY-BOTTOM, LEFT
REAR OF VALVE BLOCK

21.1 Install duckbill check valve (P/N 10-0700-

060014) in air inlet port with bill facing inside
cavity.

21.2 Place washer (P/N 10-0700-040007) on
top of duckbill check valve. Raised step fits
into duckbill.

NOTE: Lightly lubricate both sides of washer to
prevent binding or twisting between duckbill check
valve and nylon cone inlet filter.

21.3 Place large diameter end of nylon cone inlet
filter (P/N 10-0700-080006) into air inlet port on
valve block.

NOTE: Install air inlet fitting (P/N 10-0700-

070009) with lubricated O-ring (P/N 10-0700-

060004) into air inlet port on valve block and
hand tighten in place.

21.4 Using a 3/4" wrench, secure air inlet into
valve block. Torque to 120 in/lb.

22.0 OXYGEN INLET ASSEMBLY BOTTOM
REAR, RIGHT OF VALVE BLOCK

22.1 Hand-tighten oxygen inlet assembly

into valve block port.

NOTE: This assembly threads into the block with a
left hand thread. Turn COUNTERCLOCKWISE to
tighten. Single groove on nut indicates left hand thread.

22.2 With a 3/4” wrench, secure assembly to
valve block. Torque to 120 in/lb.

23.0 ALARM CAP ASSEMBLY

23.1 From below valve block, carefully install

alarm cap assembly into valve block. Hand­tighten only.

Page 24 of 39

L 4.2.3-96 Rev 2

SECTION 7:
CALIBRATION

1. CALIBRATION TOOLS/EQUIPMENT

▪ Thin Bladed Screwdriver or Knife
▪ 1/8” Allen Wrench
▪ 1 1/8” Open End Wrench
▪ 7/8” Open End Wrench
▪ 11/16” Open End Wrench
▪ 9/32” Nut Driver
▪ Pin Wrench (P/N TAOBA-00000-77)
▪ Oxygen Regulator (2 Stage, Adjustable 0-80

PSIG [0-5.60 kg/cm²])

▪ Air Regulator (2 Stage, Adjustable 0-80

PSIG).

▪ Oxygen Flowmeter Adapter (0-15LPM)
▪ Oxygen Analyzer (analyzer should read in

tenths to ensure accuracy of calibration)

▪ Oxygen Sampling Hose
▪ Oxygen Sensor

2. AIR/OXYGEN SETUP

• The gas supplies must be clean and dry and

have the ability to generate 80 PSIG (0-

5.60 kg/cm²) for both air and oxygen inlet
pressures.

• When high pressure tanks are utilized,

blow potential debris from the valve;
quickly open and close each valve to
prevent debris from entering the test
equipment.

• Connect recommended adjustable air and

oxygen regulators to each gas supply,

securing with a 1 1/8” open end wrench.

• Turn the oxygen and air regulator control

knobs to full counterclockwise closed
position.

• Secure the air and oxygen high pressure

hoses to each regulator using applicable
wrenches.

3. OXYGEN ANALYZER SETUP/

CALIBRATION

• The accuracy of the calibration of the

120H/L High-Low Flow Blender will
depend heavily upon the accuracy of the
oxygen analyzer.

• The oxygen analyzer should have a

response time of 10 seconds or less. The
analyzer should read in tenths and
ideally be of the digital type.

• Calibrate the oxygen analyzer according

to the manufacturer’s procedure.

4. TEST EQUIPMENT SETUP

• Install the built-in post bracket on

the120H/L High-Low Flow Blender into
the post bracket on the pole.

• Using 7/8” and 11/16” open end

wrenches, secure the air and oxygen high
pressure hoses to the 120H/L High-Low
Flow Blender inlets.

• Attach and secure flowmeter, in

upright position, to side outlet on
adapter.

NOTE: Ensure flowmeter is turned OFF.

• Attach one end of connecting hose to

flowmeter and other end to bifurcation.
Ensure one way valve is secured into
remaining large opening of bifurcation.
Attach remaining outlet of bifurcation to
oxygen analyzer probe.

• The system is now ready for calibration.

Page 25 of 39

L 4.2.3-96 Rev 2

SECTION 7:
CALIBRATION

CALIBRATION PROCEDURE 120H/L HIGH­LOW FLOW OXYGEN BLENDER

1.0 FRONT AND REAR SEAT LEAK TEST

1.1 Connect gas supply source(s),0-80 PSIG (0-

5.62 kg/cm²) pressure regulator(s), pressure test
tube(s), leak test tube, and sampling beaker half way
filled with water to valve block as shown in Figure

20.

NOTE: Compressed air may be utilized for seat leak
test.

1.2 Adjust O2 pressure regulator between 10-15
PSIG (0.70 – 1.05 kg/cm²). Air regulator remains
OFF (i.e. CLOSED).

1.3 Slowly turn blender valve stem (P/N 10­0702-010003) clockwise, until bubbles
appear on water surface.

1.4Then turn valve stem counterclockwise until
bubbles just stop. A maximum leak of 4 bubbles
per minute is acceptable.

NOTE: If bubbling continues at a rate greater
than 4 bubbles per minute, either the front seat or
valve stem are damaged and should be replaced.

1.5 Carefully install control (or O2 selection) knob
with black pointer against left side stop (i.e. 21%
O

2

), and secure knob collet nut with 9/32” nut

driver. Turn Oxygen supply source OFF (i.e.
CLOSED).

Figure 20

Compressed O

2

Supply

Adjustable

Regulator
0-80PSIG

For 21%

closed
position, adjust
front valve seat

assembly.

Air

Adjustable

Regulator
0-80PSIG

O

2

For 100%

closed
position, adjust

valve stem.

Sampling Device

Gauge

Gauge

Compressed Air

Supply

Page 26 of 39

L 4.2.3-96 Rev 2

SECTION 7:
CALIBRATION

1.6 Carefully rotate O2 selection knob clockwise

until black-pointer rests against right side stop (i.e.
100% O2).

CAUTION: Extreme care must be taken during

this procedure. Any resistance to rotation is likely to
be valve contact with rear seat. Further turning of
knob will force the valve into the rear seat making
subsequent calibration difficult.

NOTE: If unable to fully rotate knob to right side
stop (i.e. 100% O2), return the knob to the left side
stop (i.e. 21% O2), and remove the knob. With pin
wrench, rotate the front valve seat (P/N 10-0702-

010002) counterclockwise approximately one half
(1/2) turn, and return to step 1.2

1.7 Carefully remove O2 selection knob, make
certain not to upset or change valve stem position.

1.8 Adjust air pressure regulator between 10-15
PSIG (0.70 – 1.05 kg/cm²).

1.9 Using pin wrench, carefully and slowly, turn
front valve seat (P/N 10-0702-010002) clockwise
until bubbling at water surface just stops. STOP
adjusting seat, the very moment bubbling ends. Be
aware that bubbling may continue after seat and
valve have made contact. A maximum leak of 4
bubbles per minute is acceptable.

NOTE: If bubbling continues at a rate greater than
4 bubbles per minute, either the rear seat or valve
stem are damaged and should be replaced.

1.10 Using a 11/16” wrench, secure nut (P/N 10­0700-010004) checking the seat position has not
changed during tightening of nut, by ensuring that
bubbling has just stopped and does not reappear.
Torque nut to 40 in/lb.

1.11 Install O-ring (P/N 10-0700-060007) on
nut. Carefully reinstall O2selection knob with
pointer at right side (i.e.100% O

2)

stop. Torque

collet nut to 4 in/lb.

1.12 Rotate knob counter clockwise to verify left

hand (i.e. 21% O2) top is bubbling at a rate of less
than 4 bubbles per minute. Install cap on knob.

2.0 PROPORTIONING VALVE

NOTE: Proportioning valve endpoints are set by

following Front & Rear Seat Leak Test.

2.1 Turn air and oxygen sources ON. Adjust
both regulators to a static 50 PSIG and adjust
flowmeter to 3.5 LPM.

2.2 Rotate control knob counterclockwise to
21% stop, allow analyzer to stabilize.

2.3Perform the following checks:

Knob

Pressure

Setting

Oxygen/Air

% Concentration

21

*50 PSI/50 PSIG

21.0%/22.0%

30

*50 PSI/50 PSIG

27.0%-33.0%

60

*50 PSI/50 PSIG

57.0%-63.0%

90

*50 PSI/50 PSIG

87.0%-93.0%

100

*50 PSI/50 PSIG

97.0%-100%

* = 3.52 kg/cm² / 3.52 kg/cm²

Knob

Pressure

Setting

Oxygen/Air

% Concentration

30

*50 PSI/50 PSIG

27.0%-33.0%

60

*50 PSI/50 PSIG

57.0%-63.0%

90

*50 PSI/50 PSIG

87.0%-93.0%

* = 3.52 kg/cm² / 2.81 kg/cm²

30

*50 PSI/50 PSIG

27.0%-33.0%

60

*50 PSI/50 PSIG

57.0%-63.0%

90

*50 PSI/50 PSIG

87.0%-93.0%

* = 3.52 kg/cm² / 4.22 kg/cm²
If concentrations do not meet specifications,
repeat Front and Rear Seat Leak Test

Page 27 of 39

L 4.2.3-96 Rev 2

SECTION 7:
CALIBRATION

2.4 Adjust O2 selection knob at 60% oxygen

and set air/oxygen pressures each at 50
PSIG.

2.5 Remove flowmeter adapter and flowmeter
from primary outlet of blender.

2.6 Disconnect flowmeter from primary
outlet, then connect flowmeter to auxiliary
outlet (i.e. right side outlet) on blender .

2.7 Adjust flowmeter to 0.5LPM and check
oxygen analyzer. Reading should be between

57.0%-63.0%.

2.8 Insert bleed test tube assembly into bleed port
at bottom of valve block, flow tube should read

2.5-3.5 LPM.

NOTE: Should blender not meet either
specification, 2.7 or 2.8, inspect bleed orifice in

auxiliary outlet or bleed orifice in valve block for
occlusion.

2.9 Increase air pressure from 50 PSIG (3.52
kg/cm²) to 60 PSIG (4.22 kg/cm²). O2% on
oxygen should read 57%-63%.

2.10 Lower air pressure from 60 PSIG (4.22
kg/cm²) to 40 PSIG (2.81 kg/cm²). O2% on
oxygen analyzer should read 57%-63%.

2.11Repeat steps 1.8 and 1.9 by increasing or
decreasing oxygen supply pressure.

2.12 Remove bleed test tube assembly from
bleed port.

3.0 ALARM CALIBRATION
The Alarm system is designed to sound an audible
tone if the inlet pressures are different by 20 PSI
(1.41 kg/cm²) or more, such as if either source gas
failed.

When the 120H/L High-Low Flow Blender is in
the alarm phase, the remaining or higher
pressure gas is routed to the blender outlet.
Some gas will also flow through the alarm reed
valve creating an audible tone.

3.1 Ensure air and oxygen regulators are
adjusted to a static 50 PSIG (3.52 kg/cm²),
align control knob indicator with 60%,
and ensure flowmeter is set to 15 LPM

3.2 Reduce air pressure until the audible alarm
sounds. The air pressure should read 30 ± 2 PSIG
(2.11 ± 0.14 kg/cm²).

If the alarm sounds above this pressure, rotate
adjuster clockwise, left side of blender, with a

1/8” Allen wrench until alarm sounds as 30 ± 2

PSIG (2.11 ± 0.14 kg/cm²).
If the alarm sounds below this pressure, rotate

adjuster counterclockwise, left side of blender,
with a 1/8” Allen wrench until alarm sounds at 30
± 2 PSIG (2.11 ± 0.14 kg/cm²).

3.3Raise air pressure slowly. Alarm bypass
should reset to normal function when pressure
reaches 44 PSIG (3.10 kg/cm²) or above.

3.4 Restore air pressure to 50 PSIG (3.52 kg/cm²)
and reduce oxygen pressure until the audible
alarm sounds. The oxygen pressure must be 30 ±
2 PSIG (2.11 ± 0.14 kg/cm²).

• If alarm sounds above this pressure, rotate

adjuster clockwise, right side of blender,

with a 1/8” Allen wrench until alarm

sounds at 30 ± 2 PSIG.

• If alarm sounds below this pressure, rotate

adjuster counterclockwise, right side of

blender, with a 1/8” Allen wrench until

alarm sounds at30 ± 2 PSIG (2.11 ± 0.14
kg/cm²).

Page 28 of 39

L 4.2.3-96 Rev 2

SECTION 7:
CALIBRATION

3.5 Raise oxygen pressure slowly. Alarm bypass

should reset to normal function when pressure
reaches 44 PSIG (3.10 kg/cm²) or above.

4.0 OUTLET FLOW TEST

4.1 With 0 – 35 LPM flowmeter connected to

auxiliary outlet fitting, set O2 selection knob at
60% and oxygen/air supply sources at 50 PSIG
(3.52 kg/cm²) static.

4.2 Turn flowmeter control knob completely
open. Flowmeter should read a minimum of 30
LPM.

4.3 Reduce air pressure to 0 PSIG (0 kg/cm²).
Flowmeter should read a minimum of 30 LPM.
Audible alarm should sound.

4.4 Increase air pressure to 50 PSIG (3.52 kg/cm²)
and rotate O2 selection knob against 21% stop.
Flowmeter should read a minimum of 30 LPM.

4.5 Rotate O

2

selection knob against 100% stop.

Flowmeter should read a minimum of 30 LPM.

4.6 Set O2 selection knob at 60%. Reduce O

2

pressure to 0 PSIG (0 kg/cm²). Flowmeter should
read a minimum of 30 LPM. Audible alarm should
sound.

4.7 Remove flowmeter form auxiliary outlet and
connect to primary outlet fitting. Repeat steps 4.2
through 4.6.

4.8 Remove flowmeter from primary outlet
fitting.

5.0 INSTALLATION OF CONTROL KNOB

5.1 Rotate control knob fully to 100%

position. Check O2 concentration.

5.2 Using a 9/32” nut driver, loosen

control knob nut (P/N 10-0700-010007)
and remove control knob.

5.3 Install O-ring (P/N 10-0700-060007)
on front valve seat nut (P/N 10-0700-

010004).

5.4 Push control knob onto front valve
stem, seating it fully on the front valve
seat nut O-ring with the black pointer at
the 100% position. Be careful not to rotate
valve stem.

5.5 Tighten the control knob nut, using a
9/32” socket. Torque to 4 in/lb.

5.6 Recheck 100% - 21% O2 concentration.

5.7 Snap control knob cover (P/N 10-

0700-040006) into control knob.

Page 29 of 39

L 4.2.3-96 Rev 2

SECTION 8:
CLEANING AND STERILIZATION

Use an all-purpose liquid cleaner on exterior. For other general cleaning, use a 70% isopropyl alcohol
solution.

WARNINGS:

• Do NOT steam autoclave or otherwise subject 120H/L High-Low Flow

Air/Oxygen Blender to temperatures over145°F (62°C).

• Do NOT immerse assembled 120H/L High-Low Flow Air/Oxygen

Blender into liquid decontamination agents.

• Do NOT use any strong solvent or abrasive cleaners on labels.

Page 30 of 39

L 4.2.3-96 Rev 2

SECTION 9:
MAINTENANCE AND SERVICE POLICY

WARNING: The 120H/L High-Low Flow

AIR/OXYGEN BLENDER should be serviced or
calibrated by a qualified and trained service
technician.

The 120H/L High-Low Flow AIR/OXYGEN
BLENDER should be subject to a regular
maintenance and service program, including
periodic accuracy checks between normal
overhauls. Although the frequency of these tests
will vary depending on degree and severity of
service, it is recommended that they be performed
at least once every six (6) months under the best of
conditions.

Elastomer components such as diaphragms and O­Rings are designed to function satisfactory for a
minimum of two (2) years. The need for cleaning
and replacement depends on gas line conditions
and is indicated by the blender not meeting its
specified performance. The blender may
malfunction due to excessive dirt and debris.
OHIO MEDICAL recommends that unit be
overhauled every two (2) years. Elastomer
components will not function indefinitely, and the
probability of their causing malfunctions increases
progressively after two (2) years of service.

Page 31 of 39

L 4.2.3-96 Rev 2

SECTION 10:
DISPOSAL INSTRUCTIONS

This device and its packaging contain no hazardous materials. No special precautions need to be taken when
disposing the device and/or its packaging.

Page 32 of 39

L 4.2.3-96 Rev 2

SECTION 11:
REPLACEMENT PARTS

Part Number

Description

Quantity

Required

10-0700-020001

Proportion Block

1

10-0700-040002

Cover Plate – Dark Grey

1

10-0700-020002

Diaphragm Block

4 10-0700-030005

Alarm Sleeve Spring

2 10-0700-020003

Bypass Seat Cap

1

10-0700-010001

Bypass Adjuster

2

10-0700-020004

Alarm Shuttle

1 10-0700-070001

Alarm Sleeve

1 10-0700-030001

Primary Check Valve Spring

1

10-0700-070002

Primary Check Valve Poppet

1

10-0700-070003

Check Valve Housing

1

10-0700-030002

Auxiliary Check Valve Spring

1 10-0700-070004

Auxiliary Check Valve

1

10-0701-070001

High flow Auxiliary Outlet Connector

1

10-0700-070006

Oxygen Inlet Center Connector

2

10-0700-070007

Oxygen Inlet DISS

1

10-0700-070008

Oxygen Inlet DISS Nipple

1 10-0700-080002

Starwasher

1

10-0700-030003

Alarm Cap Spring

1

10-0700-030004

Rear Cap Spring

1

10-0700-010002

Checkball Retainer

1 10-0700-070009

Air Inlet Connector

1

10-0700-010004

Front Seat Nut

1

10-0700-040009

Control Knob

1

10-0700-010005

Knob Collet

1

10-0700-010006

Control Knob Washer

1

10-0700-010007

Control Knob Nut

1

10-0700-040006

Knob Cover

1

10-0700-030008

Socket Head Cap Screw, 2.25”

4

10-0700-080003

Diaphragm Block Ball Bearing

4 10-0700-030007

Diaphragm Block Spring

1 10-0700-030009

Socket Head Cap Screw, 0.75”

8

10-0700-060001

O-Ring, Balance Blocks and Check Valve

10

10-0700-060002

O-Ring, Alarm Sleeve and Block Cap

1 10-0700-060003

Front Valve Seat O-Ring

1 10-0700-060004

Inlet/Outlet Connector O-Ring

3

Page 33 of 39

L 4.2.3-96 Rev 2

SECTION 11:
REPLACEMENT PARTS

Part Number

Description

Quantity Required

10-0700-060005

Front Valve Stem O-Ring

1

10-0700-060006

Bypass O-Ring

2

10-0700-060007

Front Seat O-Ring

1

10-0700-060008

Alarm Cap O-Ring

2

10-0700-060009

Alarm Sleeve O-Ring

2

10-0700-060010

O-Ring, Connectors and Caps

4

10-0700-060011

Rear Seat O-Ring

1

10-0700-080004

Muffler Bleed

1

10-0700-080005

Foam Diffuser

1

10-0700-040003

Blender Alarm Cap

1

10-0700-060013

Check Ball

1

10-0700-060014

Duck Bill Check Valve

3

10-0700-040007

Step Washer

2

10-0700-080006

Inlet Cone Filter

2

10-0700-080007

Balance Block Diaphragm

2

The Quantity required column indicates the
number of parts actually required for one 120H/L
High-Low Flow Air/O2 Blender.

Maintenance Kit (P/N DAOBA-00000-05) is
packaged with the actual quantity required.

Page 34 of 39

L 4.2.3-96 Rev 2

SECTION 11:
REPLACEMENT PARTS

)

120H/L HIGH-LOW FLOW AIR/O2 BLENDER KIT (P/N DAOBA-00000-05)

Part

Description

Quantity

Number

Required

10-0700-130006

Caution/Warning Label

1

10-0700-080002

Starwasher

1

10-0700-030006

Control Knob Spring

1

10-0700-080003

Diaphragm Block Ball Bearing

4

10-0700-060001

Balance Blocks and Check Valve O-Ring

11

10-0700-060002

Alarm Sleeve and Block Cap O-Ring

3

10-0700-060003

Front Valve Seat O-Ring

1

10-0700-060004

Inlet/Outlet Connector O-Ring

4

10-0700-060005

Front Valve Stem O-Ring

1

10-0700-060006

Bypass O-Ring

2

10-0700-060007

Front Seat O-Ring

1

10-0700-060008

Alarm Cap O-Ring

2

10-0700-060009

Alarm Sleeve O-Ring

2

10-0700-060010

Connectors and Caps O-Ring

10

10-0700-060011

Rear Seat O-Ring

1

10-0700-060012

O2 Inlet O-Ring

1

10-0700-080004

Muffler Bleed

1

10-0700-080005

Foam Diffuser

1

10-0700-060013

Check Ball

1

10-0700-060014

Duck Bill Check Valve

3

10-0700-040007

Step Washer

2

10-0700-080006

Inlet Cone Filter

2

10-0700-080007

Balance Block Diaphragm

2

Page 35 of 39

L 4.2.3-96 Rev 2

SECTION 12:
PRODUCT SPECIFICATIONS

120H/L HIGH-LOW FLOW AIR/O2 BLENDER

Size (not including inlet and outlet fittings)………… Height– 3 ½” (9cm)

Width– 2 ¼” (5.6cm)
Depth– 4 ½” (11.5cm)

Weight…………………………………………….. 2.75 lbs (1.4 kg)

Gas Supply Pressure (Air & O2)……………………. 30 – 75 PSIG (2.11 kg/cm² - 5.27 kg/cm²). The

blender will maintain stated accuracy at supply
pressures provided the differential between supply
pressures does not exceed 10 PSIG (0.70 kg/cm²).
Output flow rate will be diminished if either supply
pressure is below 50 PSIG (3.52 kg/cm²) and will be
increased if both supply pressures are above 50 PSIG
(3.52 kg/cm²).

Knob Adjustment Range…………………………….

Primary Outlet……………………………………….

Primary Outlet Flow Range…………………………

Maximum Flow @ 60% knob setting,
50 PSIG (3.52 kg/cm²) inlet pressure………………..

Flow @ 21% or 100% knob setting,
50 PSIG (3.52 kg/cm²) inlet pressure………………..

Bypass flow (loss of air or O2)
50 PSIG (3.52 kg/cm²) inlet pressure

of remaining gas……………………………………..

Auxiliary Outlet……………………………………..

Auxiliary Outlet Flow Range………………………..

Accuracy – with inlet gases within 10 PSIG
(0.70 kg/cm²) and each gas pressure greater
than 30 PSIG (2.11 kg/cm²), but less than 75
PSIG (5.27 kg/cm²)………………………………….

21 to 100%

Bottom Port

15 to 120 LPM (no bleed flow)

>120 LPM

>90 LPM

>90 LPM

Right Side Port (Facing unit)

2 to 100 LPM (Bleed 10-12 LPM)

± 3% of full scale over the stated flow ranges (i.e., 3
percentage points at any reading

Page 36 of 39

L 4.2.3-96 Rev 2

SECTION 12:
PRODUCT SPECIFICATIONS

120H/L HIGH-LOW FLOW AIR/O2 BLENDER

Alarm/Bypass Activation…………………………… 20 ± 2 PSIG (1.41 ± 0.14 kg/cm²) when inlet gas

pressures differ by a nominal 20 PSIG (1.41 kg/cm²)
or more provided maximum pressure of either
supply gas does not exceed 75 PSIG (5.27 kg/cm²)
and minimum pressure of one supply gas remains at
40 PSIG (2.81 kg/cm²) or above. In other words, one
supply gas must remain at 40 PSIG (2.81 kg/cm²) or
above to provide enough gas pressure to operate the
alarm in the event the other supply pressure falls to
20 PSIG (1.41 kg/cm²) or below. There will be no
alarm or bypass if the control knob is set to 21% and
source oxygen pressure is reduced or turned off.
Similarly, if control is set to 100% there will be no
alarm if air pressure is reduced or turned off. In
either case, the unit will continue to deliver the
selected concentration of 21% or 100%. There will
be no alarm under condition of 20 PSIG (1.41
kg/cm²) or greater source pressure differential if unit
is not in use (i.e. no output flow or bleed flow).

Alarm Sound Generator…………………………….. Vibrating Reed

Alarm/Bypass Reset………………………………… When inlet pressure differential is 6 PSIG (0.42

kg/cm²) or less.

Pressure Drop……………………………………….. Less than 6 PSIG (0.42 kg/cm²) at 50 PSIG (3.52

kg/cm²) inlet pressure and 40 LPM.

Page 37 of 39

L 4.2.3-96 Rev 2

SECTION 13:
TROUBLESHOOTING

PROBLEM

POTENTIAL CAUSE

CORRECTIVE ACTION

Oxygen concentration discrepancy
between blender setting and
analyzer (greater than 3%)

1. Flow requirements are
outside the specified LPM
range

2. Analyzer out of calibration

3. Blender is out of calibration

4. Low flow bleed muffler is
obstructed causing restriction
of fixed bleed

5. Gas supply contaminated

6. Air entrained into circuit by
ventilator or accessory device.

1. Correct the flow. Verify that the

correct outlet port is being used.
Each outlet port has a different
flow range. Auxiliary outlet (2
LPM or more). Primary outlet (15
LPM or more)

2. Calibrate analyzer

3. Recalibrate or service further as

necessary.

4. Remove obstruction and verify

bleed flow is within tolerance.

5. Correct the contaminated gas

supply. Check source gases with
calibrated O2 analyzer to confirm
O2 is 100% and AIR is 21%

6. Contact Ohio Medical for

further information.

Alarm Sounding

1. Inlet pressure differences
of 20 PSI (1.41 kg/cm2) or
more.

2. Alarm module is not
calibrated properly.

3.Inlet gas contamination alarm
module malfunction.

1. Correct the pressure difference.

2. Recalibrate or service further as

necessary.

3. Disassemble, clean, reassemble,

calibrate, install inlet filter/water
trap on air line, and correct cause of
gas contamination.

Page 38 of 39

L 4.2.3-96 Rev 2

SECTION 13:
TROUBLESHOOTING

PROBLEM

POTENTIAL CAUSE

CORRECTIVE ACTION

120H/L High-Low Flow Air/O2
Blender in bypass- no alarm

1.Reed plate is improperly
installed or damaged.

2.Alarm gas orifice is
obstructed.

1.Remove and replace.

2.Remove obstruction from
orifice. If problem persists,
contact Ohio Medical for
repair.

120H/L High-Low Flow Air/O2
Blender Accurate only when inlet
gas pressures are equal

1. Balance module not
functioning properly.

2.Both air and oxygen gas
sources are below 30 PSIG.

1.Disassemble balance module,
clean, replace diaphragm(s).
Reassemble and test.

2.Correct the low pressure
condition.

Page 39 of 39

L 4.2.3-96 Rev 2

SECTION 14:
WARRANTY

PRODUCTS MANUFACTURED BY TENACORE HOLDINGS INC. ARE WARRANTIED TO BE
FREE FROM DEFECTS IN MATERIALS AND WORKMANSHIP

The liability of OHIO MEDICAL under this warranty is limited to replacing, repairing or issuing credit.
Determination will be made by OHIO MEDICAL. Such determination will be made in relation to the parts
that become defective or fail to meet published specifications during the warranty period. OHIO MEDICAL
will not be liable under this warranty unless (A) OHIO MEDICAL is promptly notified in writing by Buyer
upon discovery of defects or failure to meet specifications; (B) the defective unit or part is returned to OHIO
MEDICAL, transportation charges prepaid by Buyer; (C) the defective unit or part is sent by buyer to OHIO
MEDICAL prior to the last day of the warranty period; and (D) OHIO MEDICAL’s examination results in a
determination that the unit has suffered such defects or failures as a result of misuse, neglect, improper
installation, unauthorized repair, alteration or accident.

OHIO MEDICAL warranties as described above and set forth shall not be accretive, diminished or affected
by, and further no obligation or liability shall arise or grow from the disclosure of technical advice or service
by OHIO MEDICAL or its agents in connection with Buyer’s orders.

LIMITATIONS OF LIABILITIES

In no event shall OHIO MEDICAL be liable to Buyer for loss of profits, loss of use, consequential damage or
damages of any kind based upon a claim of breach of warranty, other than the purchase price of any defective
product covered within.

This warranty does not cover normal maintenance such as cleaning, adjustment or lubrication and updating of
equipment or parts. This warranty shall be void and shall not apply if the equipment is used with accessories
or parts not manufactured by TENACORE or authorized for use in writing by OHIO MEDICAL, or if the
equipment is not maintained in accordance with a prescribed schedule of maintenance.

The warranty stated above shall extend for a period of six months from the day of delivery, with the following
exceptions:

1. Elastomeric components and other parts or components subject to deterioration over which OHIO
MEDICAL has no control are warranted for sixty (60) days from date of receipt.

The foregoing is in lieu of any other warranty, expressed or implied, including, without limitation, any
warranty of merchantability, except as to title, and can be amended only in writing by a duly authorized
representative of OHIO MEDICAL.

1111 Lakeside Drive,

Gurnee, IL 60031

www.ohiomedical.com