Ohio Medical MiniOX 1A User guide

MiniOX® 1A

Oxygen Analyzer

Operation Manual

WARNING

THIS MANUAL MUST BE READ CAREFULLY PRIOR TO THE OPERATION OF THIS DEVICE.
THIS DEVICE WILL PERFORM AS DESIGNED ONLY IF USED IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS. IMPROPER USE MAY CAUSE THE DEVICE TO
FAIL TO PERFORM AS DESIGNED AND MAY CAUSE INJURY TO THE PATIENT AND/OR
HEALTHCARE PROFESSIONAL.

The warranties made by Ohio Medical Corporation® with respect to these products are voided if the
products are not installed, used and serviced in accordance with the instructions in this manual.
Please protect yourself and your patients by following them. We encourage our customers to
write or call regarding this equipment prior to use or for any additional information relative to use
or repairs.

This product is not intended as a life-sustaining or life-supporting device.

FEDERAL (USA) LAW RESTRICTS THIS DEVICE TO SELL BY OR ON THE ORDER OF A
PHYSICIAN

Ohio Medical Corporation® | 1111 Lakeside Drive | Gurnee, IL 60031 USA

1-866-549-6446 | fax: [phone] | www.ohiomedical.com

P/N 806129 [Rev.2] 02/2016

Ohio Medical Corporation

®

Medical Instrument Warranty

This product is sold by Ohio MedicalTM under the warranties set forth in the following paragraphs. Such
warranties are extended only with respect to the purchase of this product directly from Ohio Medical or Ohio

Medical’s Authorized Dealers as new merchandise and are extended to the rst Buyer thereof, other than

for purpose of resale.

For a period of twelve (12) months from the date of original delivery to Buyer, to Buyer’s order, or to an
Ohio Medical Authorized Dealer, this product, other than its expendable parts, is warranted to be free
from functional defects in materials and workmanship and to conform to the description of the product
contained in the service manual and accompanying labels and/or inserts, provided that the same is properly
operated under conditions of normal use, that regular periodic maintenance and service is performed and
that replacements and repairs are made in accordance with the instructions provided. This same warranty is
made for a period of sixty (60) days with respect to the expendable parts. The foregoing warranties shall not
apply if the product has been repaired other than by Ohio Medical or in accordance with written instructions
provided by Ohio Medical, or altered by anyone other than Ohio Medical, or if the product has been subject
to abuse, misuse, negligence, or accident.

Ohio Medical’s sole and exclusive obligation and Buyer’s sole and exclusive remedy under the above
warranties is limited to repairing or replacing, free of charge, at Ohio Medical’s option, a product, which is

telephonically reported to the nearest Ohio Medical Regional Service Ofce and which, if so advised by Ohio
Medical, is thereafter returned with a statement of the observed deciency, not later than seven (7) days
after the expiration date of the applicable warranty,to the designated Ohio Medical Service Ofce during

normal business hours, transportation charges prepaid, and which, upon Ohio Medical’s examination, is
found not to conform with the above warranties. Ohio Medical shall not be otherwise liable for any damages
including, but not limited to incidental damages, consequential damages, or special damages.

There are no express or implied warranties which extend beyond the warranties herein above set forth.

Ohio Medical makes no warranty of merchantability or tness for a particular purpose with respect to the

product or parts thereof.

P/N 806129 [Rev.2] 02/2016

MiniOX® 1A Oxygen Analyzer General WARNINGS and CAUTIONS

General WARNINGS and CAUTIONS

WARNING

1. The MiniOX® 1A Oxygen Analyzer will perform

to specications only if it is used and serviced in

accordance with the manufacturer’s instructions.

This instrument is to be used only by qualied,

trained personnel who have carefully read
the operating manual and labels and who
have observed the information set forth. If this
instrument does not perform as described in this
manual, the instrument must not be used until

the condition is rectied.

®

2. The MiniOX

1A Oxygen Analyzer should
be calibrated prior to each use. A two point
calibration check should be performed weekly.
See Section 3, Operation. If the instrument can
not be calibrated, the sensor must be replaced. If
the instrument still is unable to be calibrated, the
instrument must be serviced.

3. The oxygen sensor has a minimal response to
certain gases other than oxygen. Be aware of
these gases and their interference levels. See
Section 5, Performance Specications.

4. The oxygen sensor is affected by changes in
barometric pressure. See Section 3, Effects of
Pressure, for the effects of pressure.

5. The sensor is a sealed unit containing a
potassium hydroxide electrolyte. If the sensor
should develop a leak, dispose of it immediately,
as the sensor contains caustic material. It must
be disposed of in accordance with all applicable
federal, state, and local regulations. Should
contact occur with skin or clothing, rinse area
immediately with large quantities of water. In

case of eye contact, immediately ush eyes with

water for at least 15 minutes, holding eyes open.
Call a physician.

®

6. Never operate the MiniOX

1A Oxygen Analyzer
if it is suspected that water or other liquids have
entered into the case. If this occurs, immediately
turn unit OFF and contact your nearest Ohio
Medical Corporation Service Center for additional
information.

7. Use of devices generating or emitting
electromagnetic radiation near the MiniOX

®

1A
Oxygen Analyzer may interfere with the proper
operation of the product, causing it to fail to perform
as designed. Particularly, the electromagnetic
radiation from the interfering device may cause
the product to display incorrect/erratic values or
to stop operating. Special attention should be
paid to the patient if this occurs.

®

8. Never use the MiniOX

1A Oxygen Monitor in

combustible atmosphere, such as occurs with

ammable anesthetics. Such use could result in

ignition of atmosphere.

9. Never allow an excess length of cable near the
patient’s head or neck, as such could result in
strangulation. Secure excess cable to the bed
rail or other suitable object.

FAILURE TO COMPLY WITH THESE WARNINGS
CAN RESULT IN SERIOUS INJURY OR DEATH
OF THE PATIENT.

CAUTION

1. Remove internal battery if unit is to be non­operational for extended periods of time.

2. Observe polarity when inserting a new battery.
Incorrect connection may cause damage to the
instrument.

®

3. The MiniOX

1A Oxygen Monitor must never be
immersed in any cleaning solution, autoclaved,
or exposed to temperatures greater than 70oC.

4. Use only Ohio Medical Corporation replacement
parts and accessories listed in Section 3 of
this manual. Analyzers can only be used with
Ohio Medical Corporation sensors. Failure to
do so may seriously impair the instrument’s
performance.

FAILURE TO COMPLY WITH THESE CAUTIONS
CAN RESULT IN INSTRUMENT DAMAGE.

P/N 806129 [Rev.2] 02/2016

WC-1

MiniOX® 1A Oxygen Analyzer General WARNINGS and CAUTIONS

Denition of WARNINGS and CAUTIONS

WARNING

CAUTION

NOTE:

Statement citing a potential safety hazard and
possible injury to yourself or others.

Statement citing a possibility of damage to the
instrument or other property.

Advisory on instrument function.

WC-2

P/N 806129 [Rev.2] 02/2016

MiniOX® 1A Oxygen Analyzer Table of Contents

Section 1

Introduction ................................................................................. 1-1

WARNING............................................................................................................................... 1-1

®

Figure 1-1 MiniOX

1A Oxygen Analyzer ............................................................................. 1-1

Section 2

Principal of Operation. ............................................................... 2-1

Section 3

Operation .................................................................................... 3-1

Set-up Procedures . .............................................................................................................. 3-1

Calibration ............................................................................................................................ 3-1

Two-point Calibration Check ................................................................................................. 3-1

Instrument Operation .......................................................................................................... .3-1

Instructions For Use .............................................................................................................. 3-2

Installation ..................................................................................................................... 3-2

Sensor Operation .................................................................................................................. 3-2

WARNING ..................................................................................................................... 3-2

®

Figures 3-1, MiniOX

Effects of Pressure, Humidity and Temperature .................................................................... 3-2

CAUTION ...................................................................................................................... 3-2

Effects of Pressure ........................................................................................................ 3-2

CAUTION .............................................................................................................. 3-3

Effects of Humidity ........................................................................................................ 3-3

Effects of Temperature .................................................................................................. 3-3

CAUTION .............................................................................................................. 3-3

CAUTION .............................................................................................................. 3-3

1A Installation ............................................................................. 3-2

Section 4

Maintenance and Care ............................................................... 4-1

Battery Replacement ............................................................................................................ 4-1

Sensor Replacement ............................................................................................................ 4-1

WARNING .................................................................................................................... 4-1

CAUTION ..................................................................................................................... 4-1

CAUTION ..................................................................................................................... 4-1

Cleaning, Disinfection and Sterilization ................................................................................. 4-1

CAUTION ...................................................................................................................... 4-1

Instrument ................................................................................................................... 4-1

P/N 806129 [Rev.2] 02/2016

TOC-1

MiniOX® 1 Oxygen Analyzer Table of Contents

Section 5

Specications ............................................................................. 5-1

Performance Specications .................................................................................................. 5-1

Interferent Gases and Vapors ............................................................................................... 5-1

Instrument Replacement Parts ............................................................................................. 5-1

Servicing ............................................................................................................................... 5-1

TOC-2

P/N 806129 [Rev.2] 02/2016

MiniOX

®

1A Oxygen Analyzer Section 1, Introduction

Section 1
Introduction

The MiniOX® 1A Oxygen Analyzer is designed to
provide spot checking of oxygen concentrations
from pressure swing absorptive devices (e.g. oxygen
concentrators).

WARNING

This instrument is not equipped with an

audible or visual alarm, and therefore must
not be used in a life-support system.

The MiniOX

®

1A Oxygen Analyzer (Figure 1-1):

• Operates by a single push of a switch.

• Calibrates with the turn of a dial.

• Features an easy-to-read digital display.

The galvanic oxygen sensor measures oxygen
concentrations from 0 to 100%. The sensor is
maintenance-free and will operate for one year, in
normal medical use.

Figure 1-1

MiniOX® 1A Oxygen Analyzer

P/N 806129 [Rev.2] 02/2016

1-1

MiniOX® 1A Oxygen Analyzer Section 2, Principle of Operation

Section 2

Principle of Operation

Each MiniOX® 1A Oxygen Analyzer uses a galvanic
oxygen sensor which is long-lived and maintenance­free.

The sensor consists of two electrodes:

• a cathode

• an anode

The gold cathode is exposed to the atmosphere

through a uoropolymer membrane. The lead anode

is submersed in a potassium hydroxide solution.

When oxygen diffuses through the membrane, the
electrochemical reduction of oxygen on the cathode
and the corresponding oxidation of the anode
generate an electrical current. The current produced
is proportional to the partial pressure of oxygen in
the sample atmosphere. The resulting electrical
current is monitored, temperature compensated,

and amplied to drive the display.

The sensor is self-zeroing; when no oxygen is
present to be chemically reduced, minimal current is
produced. Thus, approximately zero percent oxygen
is displayed.

2-1

P/N 806129 [Rev.2] 02/2016

MiniOX® 1A Oxygen Analyzer Section 3, Operation

Section 3
Operation

Set-up Procedures

1. Remove the contents from the shipping carton
and verify that you have one each of the following
items:

®

• MiniOX

• 9-Volt Alkaline Battery

• Oxygen Sensor in its container

• MiniOX
CD

• Tubing

• Male Universal Nipple Adapter

2. Remove the four screws holding the back panel
in place.

3. Install the battery.

4. Remove the sensor from its container.

5. Place green washer over threads of sensor then

screw the sensor into the ow block and hand-

tighten. Do not overtighten or cross thread.

6. Plug the sensor connector into the printed circuit
board connector mate labelled J1.

7. Replace the back panel and screws.

8. After installing the sensor, allow to equilibrate
prior to calibration.

1A Oxygen Analyzer

®

1A Operation Manual/Service Guide

adjust the reading using the calibration dial.
Turn clockwise to increase the reading, or
counter clockwise to decrease the reading.

5. If the reading cannot be adjusted to the known
concentration value, the sensor or instrument
is malfunctioning and must be serviced.

NOTE: To ensure accurate operation, the instrument

should be calibrated at the ow rate of

intended use.

Two-point Calibration Check

The purpose of a two-point check is to determine
the linearity of the sensor. Serious deviation from
linearity ( +2%) indicates the sensor is nearing end­of-life. To perform a two-point linearity check:

1. Place the sensor in a stream of a known
oxygen concentration between 90-100% until
the reading stabilizes.

2. Calibrate to match this concentration.

3. After calibration, measure room air; the
reading should be 20.8% +2%. (A +2% linearity
variation is allowed for differences due to the
method of sample introduction, the accuracy
of gas concentration, and the precision of
initial setting.) If the variation is greater than
2%, repeat the two-point linearity check. If the
variation remains greater than 2%, replace the
sensor.

9. Proceed to Calibration procedures.

Calibration

The most accurate method to calibrate the
MiniOX® 1A Oxygen Analyzer is with 100% oxygen.
Calibrating with room air is less desirable but still
acceptable, assuming the concentration of oxygen
in room air is 20.8%.

1. Press the ON/OFF switch on the side panel to
turn on the instrument.

2. Place the sensor in a ow of air with a known
oxygen concentration or in room air.

3. Wait for at least one minute, or until the reading
has stabilized.

4. If the reading on the display is other than the
known or assumed oxygen concentration,

P/N 806129 [Rev.2] 02/2016

Instrument Operation

The MiniOX® 1A Oxygen Analyzer has a low battery
indicator. When the Low Battery indicator is activated,
LO BAT appears on the top left of the display. The
instrument functions normally for approximately
eight hours; however, replace the battery as soon
as possible.

If the battery is not replaced, the instrument’s display
will go blank. If the sensor becomes disconnected
while the instrument is in use, the instrument displays
between -0.2 and +0.2.

The instrument is designed to read in percent from 0
to 100%; however, if incorrectly calibrated, it displays
up to 199.

To maximize battery life, turn OFF the MiniOX® 1A
Oxygen Analyzer when not in use.

3-1

MiniOX® 1A Oxygen Analyzer Section 3, Operation

O

Instructions for Use

Installation
(FIGURE 3-1)

Concentrator

Male DISS Fitting

DISS male x

Barbed Fitting

Adapter

Concentrator

2

Barbed tting

(if so equipped)

Tubing

O

2

1. If so equipped, remove the humidier from the
oxygen concentrator.

2. If the concentrator is equipped with a male

DISS tting, thread the female DISS tting of

®

the MiniOX

1A Oxygen Analyzer onto it and

proceed to Step 5.

3. If the concentrator is equipped with a nipple
adapter, thread the provided male universal

nipple adapter into the female DISS tting of

®

the MiniOX

1A Oxygen Analyzer and proceed

to Step 4.

®

4. Connect the nipple adapter on the MiniOX
1A Oxygern Analyzer to the nipple adapter
on the concentrator using the oxygen tubing
provided.

5. Analyze the oxygen concentration, ensuring

that the ow rate does not exceed four liters-

per-minute.

6. When the oxygen analysis is complete,
remove the sampling apparatus and reinstall

the humidier, if so congured.

Sensor Operation

The oxygen sensor has a minimal response to
certain gases other than oxygen. Be aware of these
gases and their interference levels. See Section 5,
Interferent Gases and Vapors.

The sensor is a sealed unit containing a potassium
hydroxide electrolyte.

WARNING

If the sensor develops a leak, dispose
of it immediately as sensor contains
caustic material; it must be disposed of in
accordance with all applicable federal, state

and local regulations. Should contact occur
with skin or clothing, rinse area with large

quantities of water. In case of eye contact,
immediately ush eyes with water for at

least 15 minutes, holding eyes open. Call a
physician.

Figure 3-1

MiniOX

®

1A Installation

Effects of Pressure, Humidity and

Temperature

CAUTION

To ensure accurate and reliable oxygen

analysis, a thorough understanding of
the effects of pressure, humidity, and

temperature on the sensor is necessary.

Effects of Pressure

The sensor actually senses partial pressure of
oxygen, not percentage. Changes in barometric
pressure change the reading, even if the percent of
oxygen in the sample remains constant.

Partial pressure of oxygen (PO2) equals the percent
of oxygen(% O2) times (x) the pressure at which the
sample is measured (mmHg-mercury):

PO2 = (%O2) (mmHg)

3-2

P/N 806129 [Rev.2] 02/2016

MiniOX® 1A Oxygen Analyzer Section 3, Operation

For example:

At sea level the pressure equals 760 mmHg and dry
air contains 21% O

. Therefore;

2

PO2 = (21%) (760 mmHg)

PO2 = 160 mmHg

If the instrument is calibrated to read 21% at 160
mmHg partial pressure, and the instrument is
then moved to an area above sea level where the
atmospheric pressure is 700 mmHg, a lower reading
is found due to a lower partial pressure.

PO2 = (21%) (700 mmHg)

PO2 = 147 mmHg

The percent reading on the instrument is derived by
the following formula:

(21%) (147 mmHg)

X =

= 19.3%

(160 mmHg)

Therefore, to eliminate error caused by pressure
changes, the instrument must be calibrated at the

pressure and ow rate at which it is to be used.

CAUTION

Do not expose the sensor to pressure

outside the range of 600 to 900 mmHg, (23.62

to 35.43 inches Hg.) as this can produce
instrument errors.

Effects of Humidity

The presence of humidity in an oxygen sample
decreases the actual concentration of oxygen.
Humidity in a sample has the same effects as diluting
the sample with another gas.

For example:

If 100% oxygen is saturated with 100% humidity, the
actual concentration of oxygen drops from 100%
to 96-97%. The instrument indicates this drop in
concentration.

Effects of Temperature

Each MiniOX® 1A sensor is desensitized to
temperature changes using a thermistor (temperature
variable resistor) located within the sensor. Variations
in the sensor reading due to temperature changes,
are less than 3% when used or calibrated between
0 to 40 degrees centigrade. By using the instrument
close to the temperature at which it is calibrated,
variations can be minimized.

Operating Temperature Range:

0o to 40oC (32o to 104oF)

CAUTION

Do not use instrument outside operating
temperature range.

Do not handle the sensor more than
necessary during calibration or use. Body
heat can cause the sensor’s thermistor to
change disproportional to the change in
gas sample temperature at the sensing
electrode. This can produce some error,
until thermal equilibrium is restored.

P/N 806129 [Rev.2] 02/2016

CAUTION

3-3

MiniOX

®

1A Oxygen Analyzer Section 4, Maintenance and Care

Section 4
Maintenance and Care

Battery Replacement

The MiniOX® 1A Oxygen Analyzer requires one
9-volt alkaline battery. To replace the battery:

1. Verify the instrument is turned OFF. If it is ON,
press the ON/OFF switch on the side panel to
turn the instrument OFF.

2. Remove the back panel, which is held in place
by four small screws.

3. Remove and safely or properly discard the old
battery; replace with a new battery.

4. Replace the back panel and reinstall the
screws.

5. Wait 10 seconds after connecting the new
battery before turning the instrument ON.

CAUTION

Do not overtighten or cross thread.

4. Recalibrate the instrument. See Section 3,

Calibration.

Cleaning, Disinfection and Sterilization

CAUTION

Never autoclave, immerse, or expose the
MiniOX® 1A Oxygen Analyzer (including
sensor) to high temperatures (>70°C). Never
expose the device to pressure, irradiation,
vacuum, steam, or chemicals (other than
alcohol or mild cleaning agents).

Clean the instrument and sensor by wiping with a
cloth lightly dampened with Isopropyl Alcohol or mild
detergent. Make sure that no moisture seeps into
the instrument case.

Instrument

6. Recalibrate the instrument. See Section 3,
Calibration.

Sensor Replacement

WARNING

Under no circumstances should any
adjustments other than those outlined in
this procedure be made to other controls

in the instrument. Any alteration of other
controls may affect the operation and
accuracy of the instrument and will void the

warranty.

When the MiniOX
be calibrated, or gives erratic readings, the sensor
must be replaced. To replace the sensor:

1. Verify the instrument is turned OFF. If it is ON,
press the ON/OFF switch on the side panel to
turn the instrument OFF.

®

1A Oxygen Analyzer is unable to

When cleaning or disinfecting the instrument, care
must be taken to prevent entry of solutions into the
instrument case.

Cleaning

The external surfaces of the unit may be cleaned
by wiping them with a cloth moistened with a mild
detergent solution.

Disinfection

The external surfaces of the unit may be disinfected
by wiping them with a cloth moistened with ethanol
or Cidex. The instrument is not designed to withstand
the conditions imposed by steam, ethylene oxide or
radiation sterilization.

2. Remove the old sensor by un-threading the

sensor from the ow block.

3. Thread the new sensor into the ow block and
hand-tighten.

4-1

P/N 806129 [Rev.2] 02/2016

MiniOX® 1A Oxygen Analyzer Section 5, Specications

Section 5

Specications

Performance Specications

Range 0-100% O

2

Display Resolution 0.1% O2 increments

Linearity

Accuracy

Low Battery Indicator

+2% of full scale

+2% of full scale

“LO BAT” appears on the
display

Warm-Up Time None required

Operating Temperature
Range

Storage Temperature
Range

Humidity

o

0

to 40oC (32o to 104oF)

o

-20

to 55oC (-4o to 131oF)

0 to 95% RH (non condens­ing)

Power Requirements One 9-volt alkaline battery

Battery Life Approximately 1,400 hours

Instrument Dimensions 5-11/16” x 2-1/2” x 1-3/4”

Sensor Type

Sensor Life

Galvanic fuel sensor 0-100%
O

2

Over one year in normal
medical conditions.

Sensors, as shipped, can be

Sensor Shelf Life

stored for a maximum of 6
months without degradation
of life

Response
Time
Measured

O

@ 25

C

FLOW

RATE

LITERS/

MIN.

2 14 22

4 13 21

90% OF

CHANGE

(SECONDS)

97% OF

CHANGE

(SECONDS)

6 12 20

Interferent Gases and Vapors

INTERFERENT

% BY VOL-

UME (DRY

GAS)

INTERFERENT

EQUIVALENT

OF PERCENT O

Carbon Dioxide 12% <0.1%

Cyclopropane 50% <0.1%

Diethyl Ether 20% <1.5%

Enurane 4% <0.5%

Halothane 5% <0.9%

Helium 80% <0.2%

Methoxyurane 4% <2.3%

Nitrogen 80% <0.2%

Nitrous Oxide 80% <0.8%

Instrument Replacement Parts

ITEM PART NUMBER

Case Screw 637408

4-x3/8” stainless steel screws
(set of 4)

450000

Accessories

ITEM PART NUMBER

Alkaline Battery, 9-Volt 628817

Operating Manual CD 600700

Operating Manual, printed 806129

Oxygen Sensor 806572

MiniOX

®

1A Oxygen Analyzer 804174

Oxygen Tubing 637258

Male Universal Nipple Adapter 638064

Carrying Case 710462

Servicing

Inspection and Servicing SVC-1A1

Cleaning, Calibration and Testing SVC-1A2

Enclosure Replacement SVC-1A3

Circuit Board Replacement SVC-1A4

Connector Replacement SVC-1A5

2

5-1

P/N 806129 [Rev.2] 02/2016

Ohio Medical Corporation®
1111 Lakeside Drive
Gurnee, IL 60031 USA
Phone: [phone]
Fax: [phone]
www.ohiomedical.com

P/N 806129 [Rev.2] 02/2016