Teledyne Ax300 I Users Manual M75708 0

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Portable Oxygen Analyzer

Teledyne Analytical Instruments i

OPERATING & SERVICE INSTRUCTIONS FOR

AX300-I

PORTABLE OXYGEN ANALYZER

0086

TYPE B EQUIPMENT: Equipment providing a particular degree

of protection against electric shock,

particularly regarding—

• Allowable LEAKAGE CURRENT

• Reliability of the protective earth

connection (if present).

P/N M75708

REV 0

E

CO # 03-0038

AX300-I

Teledyne Analytical Instruments ii

Copyright © 2002 Teledyne Analytical Instruments

All Rights Reserved

No part of this manual may be reproduced, transmitted, transcribed, stored in a

retrieval system, or translated into any other language or computer language in whole

or in part, in any form or by any means, whether it be electronic, mechanical, optical,

manual, or otherwise, without prior written consent of Teledyne Instruments,

Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-1580

FCC Statement

This equipment generates and uses radio frequency energy, and if not installed and

used in strict accordance with the manufacturer's instruction manual, may cause

interference to radio and TV communications. It has been type-tested and certified to

comply with the limits for a Class A, and exceeds limits for a Class B, computing

device pursuant to Subpart J of FCC Rules, which are designed to provide reasonable

protection against such interference when installed in a commercial and residential

environment. Operation of this equipment in a residential area may cause interference,

in which case the user, at his own expense, will be required to take whatever measures

may be required to correct the interference.

Note: The above statement is required by the FCC for any device

that incorporates microprocessors.

Warranty

Teledyne warrants that the goods are free from defects of material and of construction

for a period of 2 years from the date of shipment from Teledyne. The Class R-17MED

Micro-Fuel Cell is warranted for two years from the date of shipment from Teledyne.

The liability of Teledyne if any, shall be limited solely to the replacement and repair of

the goods and shall not include shipping costs or other incidental damages as defined in

Section 2-715 of the U.S. Uniform Commercial Code.

This warranty is null and void if any goods are subjected to misuse, negligence,

accident, or repairs other than those performed by Teledyne or an authorized service

center.

CAUTION: FEDERAL LAW RESTRICTS THIS DEVICE TO SALE

BY OR ON THE ORDER OF A PHYSICIAN.

Portable Oxygen Analyzer

Teledyne Analytical Instruments iii

About This Manual

The AX300-I Operator's Manual provides both introductory and

detailed information for configuring and operating these instruments.

The manual takes you from the time you unpack the instrument until you

complete the first gas analysis. The bulk of the manual contains

operating procedures and information. There are also cautions,

warnings, and guidelines to ensure that your analyzer operates normally

and to its full potential. A troubleshooting section is available to assist

you with common problems and a complete product specifications and

spare parts list is included as an appendix.

• Chapter 1: An introduction to the analyzer and its

components, features and applications.

• Chapter 2: Step-by-step set-up procedures and

information.

• Chapter 3: A guide for daily operational maintenance and

troubleshooting.

• Appendix: Specifications and available spare part options

for the analyzer, and detailed application

considerations to aid in troubleshooting, etc.

How To Use This Manual

This manual is designed to walk you through the initial set-up of

the AX300 Portable Oxygen Analyzer. After you have used it to initially

install your analyzer, it becomes a quick reference guide to help you

with specific questions or operating problems.

Before you turning on the instrument, you are advised to read the

safety information on the next few pages and the information found in

Chapters 1 and 2. These chapters acquaint the user with the instruments

use and operation before placing it into operation.

AX300-I

Teledyne Analytical Instruments iv

Safety Messages

Your safety and the safety of others are very important. Please

carefully read the following safety messages.

Safety message are indented to alert the user of potential hazards.

Each safety message is associated with a safety alert symbol. These

symbols are found in the manual and on the instrument. The definition

of these symbols is described below:

CAUTION: Refer to the instructions for details on the

specific danger. These caution symbols warn of specific

procedures, which if not followed could cause bodily Injury,

and/or damage the instrument.

WARNING: This symbol is use to alert the operator of a

condition that could cause bodily harm.

NOTE: Additional information and comments regarding a

specific component or procedure are highlighted in the form

of a note.

CAUTION: THE ANALYZER SHOULD ONLY BE USED FOR THE

PURPOSE AND IN THE MANNER DESCRIBED IN

THIS MANUAL.

IF YOU USE THE ANALYZER IN A MANNER OTHER

THAN THAT FOR WHICH IT WAS INTENDED,

UNPREDICTABLE BEHAVIOR COULD RESULT

POSSIBLY ACCOMPANIED WITH HAZARDOUS

CONSEQUENCES.

Portable Oxygen Analyzer

Teledyne Analytical Instruments v

Table of Contents

Safety Messages ..........................................................................iv

List of Figures..............................................................................vii

List of Tables ..............................................................................viii

Introduction ...................................................................................9

1.1 Applicable Standards 10

1.2 Features 10

1.3 Options 11

1.4 Applications 12

1.5 Theory of Operation 12

1.5.1 Sensor 12

1.5.2 Signal Processing 13

Operation .....................................................................................14

2.1 Setup 14

2.1.1 Sensor Installation or Replacement 15

2.1.2 Mounting 16

2.1.2.1 V-Mount Adapter Installation 17

2.1.2.2 Universal Mounting Clamp Installation 17

2.1.3 Battery Installation 17

2.1.4 Calibration 19

2.1.5 Output 0-1 VDC or RS232 21

2.2 Use 22

2.2.1 Procedure 22

2.3 Gas Sampling 24

2.3.1 Humidity 24

2.3.2 Temperature 24

2.3.3 Pressure 24

2.3.4 Discrepancy in Readings 25

AX300-I

Teledyne Analytical Instruments vi

2.3.5 Anesthetic Gases 25

2.3.5.1 Gases That Induce Reading Error 25

2.3.5.2 Care After Use in Nitrous Oxide 27

2.3.6 Cleaning 28

2.4 Do’s and Don’ts 28

Service Manual............................................................................ 31

3.1 General Service Information 31

3.2 Overall Maintenance 31

3.3 Battery Maintenance 31

3.4 Sensor Maintenance 32

3.5 Calibration 32

3.6 Gas Sampling 33

3.6.1 Humidity 33

3.6.2 Temperature 33

3.6.3 Pressure 33

3.6.4 Discrepancy in Readings 34

3.6.5 Anesthetic Gases 34

3.6.5.1 Gases That Induce Reading Error 34

3.6.5.2 Care After Use in Nitrous Oxide 36

3.7 Troubleshooting 36

3.8 Watchdog 39

3.9 Other Problems with the Instrument 40

3.10 Return Authorization for Service 41

Appendix...................................................................................... 41

A.1 Specifications 41

A.2 Spare Parts List 43

A.3 Optional Accessories 43

Index............................................................................................. 45

Portable Oxygen Analyzer

Teledyne Analytical Instruments vii

List of Figures

Figure 1-1: AX300 Front View ......................................................... 9

Figure 2-1: Installing the R17MED Sensor .................................... 15

Figure 2-2: Sensor Cable Connection to Analyzer ....................... 16

Figure 2-3: Mounting the Sensor in the Tee Adapter..................... 16

Figure 2-4: V-Mount Adapter Installation....................................... 17

Figure 2-5: Brass Insert for Universal Mounting Clamp................. 17

Figure 2-6: Installing Batteries....................................................... 18

Figure 2-8: 0-1 VDC or RS 232 Digital Output Port ....................... 21

AX300-I

Teledyne Analytical Instruments viii

List of Tables

Table 2-1: Oxygen Reading Error in a Mixture of Anesthetic Gas. 27

Table 3-1: Oxygen Reading Error in a Mixture of Anesthetic Gas. 35

Table 3-2 Troubleshooting ............................................................ 36

Table 3-3 Error Codes................................................................... 39

Portable Oxygen Analyzer Introduction

Teledyne Analytical Instruments 9

Introduction

The Teledyne Analytical Instruments AX300-I Oxygen Analyzer

here after referred to as AX300-I is a portable instrument that provides

fast and accurate oxygen analysis. These instruments are designed to

analyzer up to 100% oxygen concentration in medical gas mixtures.

Because they are microprocessor-based, the AX300-I analyzers have a

unique combination of features that make them very easy to use. The

operator interface is accomplished through a series of buttons located

conveniently on the front face of the instrument. The AX300 is shown

in Figure 1-1.

Figure 1-1: AX300 Front View

The LCD display consists of up to 3.5 characters plus a decimal

point indicator capable of displaying up to 105%. (See Section 1.3

Options for alternate display configuration). An integral battery life

indicator is displayed continuously on the AX300-I.

Introduction AX300-I

Teledyne Analytical Instruments 10

The instrument is powered by three AA alkaline batteries and is

designed to operate for 2000 hours in Non-alarm State.

Oxygen analysis is linear across the single range of 0-100% using

Teledyne’s class R17MED oxygen sensor. A unique sensor failure

alarm is incorporated which warns the user if the sensor signal is lost or

low. When this occurs, the √ SENSOR display flashes. The alarm buzzer

can be silenced by pressing the ALARM SILENCE key () or

pressing the unlock key.

1.1 Applicable Standards

The AX300-I is built to meet or exceed regulatory and industry

standards for use as a medical device. These instruments are designed,

built and tested with the following applicable standards:

ASTM F 1462: Specifications for Oxygen Analyzers

ASTM F 1463: Specifications for Alarm Signals

ISO 7767: Oxygen Analyzers for Analyzing patient

Breathing Mixtures

ISO 9703-1: Anesthesia and Respiratory Care Alarm Signals

Part 1

ISO 9703-2: Anesthesia and Respiratory Care Alarm Signals

Part 2

EN/IEC 60601-1-2: Medical Electrical Equipment—Part 1 General

Requirements for Safety. Electromagnetic

Compatibility Requirements and Test

MIL-STD-810E: Environmental Test Methods

EN/IEC 60601-1: Medical Electrical Equipment-General

Requirements for Safety

1.2 Features

The AX300-I is a compact, versatile instrument capable of rapidly

measuring the oxygen content of an atmosphere or environment

accurately to ±2% over the range 0-100% oxygen. The following

features are standard on the AX300-I:

• Large easy to read 3 1/2 digit LCD display (see options)

• Automatic LCD back lighting upon key press

Portable Oxygen Analyzer Introduction

Teledyne Analytical Instruments 11

• Microprocessor controlled

• Sensor fail/disconnect alarm indicator (audible and visual)

• Alarm silence button

• 2000 operating hours from 3 AA alkaline batteries

• Battery status indicator

• Stand for upright tabletop deployment

• Hardware for pole clamping and V block support

• Rugged high impact ABS construction

• Splash resistant case.

• Long life (36 months in air) class R17MED sensor

• 0-1 VDC digital output (optional RS-232)

• FDA approved and cleared for CSA/CE marking

1.3 Options

The following instrument options are available for the AX 300-I

analyzer:

• A-Option—3-digit LCD display instead of 3 1/2 digit

• B-Option—RS 232 digital output instead of 0-1VDC

Note: Contact the factory for retrofitting an existing instrument for

3 digit LCD display. For RS-232 reconfiguration, see

Section 2.1.5.

In addition to the above instrument configuration options, the

following optional equipment is available for your instrument:

• Universal Pole Mounting Clamp (P/N CP 2343)

• V-Mount Pole Clamp (P/N CP 2344)

• V-Mount Wall Adapter P/N B 647)

• 0-1 VDC Interface Cable (P/NB-75554)

• RS 232 Interface Cable (P/N B-75555)

Introduction AX300-I

Teledyne Analytical Instruments 12

1.4 Applications

The AX300-I analyzers is intended for spot checking concentration

of oxygen in a gas mixtures used in medical applications such as

Anesthesia, Respiratory therapy and is intended for adult, pediatric and

Neonatal populations.

These instruments may be used in verifying oxygen concentrations

in gas mixtures used in:

• Anesthesia

• Respiratory Therapy

• Neonatal Care

1.5 Theory of Operation

The AX300-I analyzer can be divided into two major functional

groups:

• R17MED Oxygen Sensor

• Signal Processing

The analyzer uses Teledyne Analytical Instruments Patented

R17MED oxygen sensor. The millovolt output signal from the sensor is

fed into the electronic signal processor, where it is used to calculate the

oxygen gas concentration and display it on the LCD screen. There is no

concentration alarm in the AX300-I analyzer however a unique sensor

fail/disconnect alarm is incorporated to warn the user of a sensor

problem. The√ SENSOR indicator is illuminated on the LCD and the

audible and visual alarms are activated whenever a fault is detected.

1.5.1 Sensor

The AX300-I uses the Teledyne Class R17MED disposable oxygen

sensor. The sensor is made up of a sensing cathode and anode (fuel)

immersed in electrolyte and packaged in a small plastic container.

Oxygen entering the sensor reacts with the anode and a proportional

current is collected at the sensing cathode, which is sent to the

electronics where it is converted into a digital signal and displayed on

the LCD Screen.

Attached to the R17MED sensor is a removable plastic diverter.

This diverter is used to facilitate the transport of gas mixtures through

Portable Oxygen Analyzer Introduction

Teledyne Analytical Instruments 13

the sensor. The diverter, packaged separately when shipped, is necessary

when the tee adapter is used to sample gas flowing through a tube.

The diverter is not necessary and should not be used when the

sensor is placed directly in a chamber, or when the sensor is used in

confined volume analysis, such as incubators and inhalation tents.

CAUTION: THE R17MED SENSOR CONTIANS A CAUSTIC

ELECTROLYTE AND LEAD. DO NOT TRY TO OPEN

THE SENSOR ASSEMBLY. CHECK THE SENSOR

REGULARLY FOR LEAKS. IF THE SENSOR IS

LEAKING, REPLACE IT. DO NOT TRY TO REPAIR IT.

CONTACT TELEDYNE FOR THE MATERIAL SAFETY

DATA SHEET RELATED TO HANDLING AND

DISPOSAL.

CAUTION: REMOVE AND SAVE THE DIVERTER WHEN THE

SENSOR IS USED IN CONFINED VOLUME

APPLICATIONS.

1.5.2 Signal Processing

The electrical voltage developed in the sensor is sent to the electronics.

Processing includes amplification, conversion to digits, and comparison to

alarm set points if appropriate. Using a microprocessor allows for easier

setting of alarms, automatic calibration, and self-diagnosis.

The oxygen level is calculated and then displayed on the liquid

crystal display (LCD) on the front panel.

The audio alarm is triggered during a sensor disconnect alarm

condition. Pressing the ALARM SILENCE key () will provide an

audible alarm override.

BLANK

Operation AX300-I

Teledyne Analytical Instruments 14

Operation

Note: Upon receipt, INSPECT THE ENTIRE UNIT FOR

DAMAGE. Check the unit and all included accessories for

broken or loose parts. If damaged, DO NOT USE. Notify

the shipper, and consult Teledyne Analytical Instruments.

Note: This equipment is internally powered using 3 AA batteries.

CAUTION: THE AX300-I, OXYGEN SENSOR AND ASSOCIATED

HARDWARE ARE NON-STERILE DEVICES. DO NOT

AUTOCLAVE THE INSTRUMENT OR SENSOR, AS

THIS WILL DAMAGE THE EQUIPMENT.

2.1 Setup

The AX300-I Portable Oxygen Analyzer is suitable for use in many

medical applications. The unit is equipped with a stand and can be used

on a tabletop or wall mounted using mounting bracket. An optional pole

mount clamp is also available.

To set up and use your AX300-I analyzer:

1. Install the sensor.

2. Install the batteries.

3. Calibrate the unit.

The control keys are designed for easy operation. A LOCK/UNLOCK

key has been supplied to prevent accidental changes to critical settings. This

eliminates unwanted changes in calibration or alarm settings from accidental

touching or bumping of the keys. To further reduce the possibly of incorrect

adjustments at least two keys must be pressed in order to modify a critical

calibration set point value.

Note: The ALARM SILENCE () key continues to operate

normally when the lock feature is activated.

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 15

2.1.1 Sensor Installation or Replacement

Note: The R17MED oxygen sensor must be installed before the

oxygen analyzer/analyzer can be operated

1. Remove the new sensor from its protective bag. Inspect the

sensor for damage or electrolyte leakage. If the sensor is

damaged, obtain a replacement. Do not use the defective

sensor as it may damage the unit.

WARNING: THE SENSOR ELECTROLYTE IS CAUSTIC. DO NOT

LET IT COME IN CONTACT WITH SKIN. IF IT DOES,

FLUSH AFFECTED AREA WITH WATER. DO NOT

ATTEMPT TO OPEN OR REPAIR THE SENSOR.

WARNING: THE SENSOR ALSO CONTAINS LEAD. LEAKING OR

EXHAUSTED SENSORS SHOULD BE HANDLED AND

DISPOSED OF IN ACCORDANCE WITH LOCAL

REGULATIONS. CONTACT TELEDYNE FOR THE

MATERIAL SAFETY DATA SHEET

2. Plug one end of the coiled cable into the jack receptacle on the

back end of the R17MED sensor and secure in place with the

capture nut located at the base of the connector. See Figure 2-1.

Figure 2-1: Installing the R17MED Sensor

3. Plug the other end of the coiled cable into the receptacle located on

the right side of the unit and secure it in place using the capture nut.

See Figure 2-2.

Operation AX300-I

Teledyne Analytical Instruments 16

Figure 2-2: Sensor Cable Connection to Analyzer

Note: When the AX300-I instrument is used for diffusion

sampling (i.e., incubators, tents, etc.), the plastic flow

diverter must be removed from the R17MED sensor. If the

sensor is used in breathing circuits, etc, the diverter must

be used as shown in Figure 2-3.

Figure 2-3: Mounting the Sensor in the Tee Adapter

2.1.2 Mounting

The AX300-I can be mounted in several ways depending on the

optional equipment ordered at the time of purchase. See Section 1.3.

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 17

2.1.2.1 V-MOUNT ADAPTER INSTALLATION

The V-Mount Adapter consists of a matching plastic plate with

integral V-grooves that attach to the rear of the instrument.

To install V-Mount Adapter remove battery compartment door by

prying up the hinged latch at the bottom of the cover, then slide the

adapter plate into grooves provided in rear case. Replace the battery

compartment door and secure door latch. See Figure 2-4.

Note: The door latch is a tight fit onto the battery cover. Use a

coin to gently pry up the latch.

Figure 2-4: V-Mount Adapter Installation

2.1.2.2 UNIVERSAL MOUNTING CLAMP INSTALLATION

The Universal Mounting Clamp is supplied with a 1/4-20 screw for

securing the clamp to the rear of the instrument. A threaded brass insert is

installed on the back of the instrument for this purpose. See Figure 2-5.

Figure 2-5: Brass Insert for Universal Mounting Clamp

2.1.3 Battery Installation

Note: Three “AA” alkaline batteries must be installed in the unit

before the analyzer will operate. The unit must be

recalibrated whenever new batteries are installed.

To install the batteries:

Operation AX300-I

Teledyne Analytical Instruments 18

1. Turn the unit off (if it is on).

2. Hold the instrument face down in the palm of your hand. Use

a coin to pry up the latch that secures the battery

compartment door. Remove the battery compartment door.

CAUTION: IMPROPER INSTALLATION OF THE BATTERIES

MAY RESULT IN DAMAGE TO THE UNIT AND

BATTERIES.

Note: Use alkaline batteries only. Other battery types will

produce erroneous battery test readings.

3. Install 3 “AA” alkaline batteries into the holder as shown in

Figure 2-6. Each battery has its own slot. To insure proper

polarity, place the bottom (flat) or negative end of the battery

in the end of the holder marked “–”. Place the top (button) or

positive end of the battery in the end of the holder marked

“+”. Do this for each battery.

Figure 2-6: Installing Batteries

4. Re-install the battery compartment door. When the unit is

first turned on the display will momentarily display all LCD

segments. During this period diagnostic tests are being

conducted to insure the circuits are functioning correctly.

The unit will activate the audible and visual alarms for about

1 second. The LCD will flash continuously indicating the

unit is in the unlocked position ready for calibration.

Note: When batteries are first installed or power is lost for any

reason the instrument defaults to the calibration mode. All

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 19

keys except the CAL and ON/OFF (I/O) keys are

inoperable until a successful calibration is achieved.

5. Note the battery display located below the oxygen readout

display. It continuously shows a bar graph of the remaining

life to the batteries. In the case of fresh batteries, it should

illuminate all 5 segments from the left to the right end of the

bar. The bar graph indicator is on continuously whenever the

instrument is powered on.

2.1.4 Calibration

The AX300-I should be calibrated before each use and every 8

hours to maintain accuracy.

Whenever new batteries are installed or

removed for any reason, the oxygen analyzer

defaults to the calibration mode with the LCD

display flashing 00.0. Only the CAL and

ON/OFF (I/O) keys are functional at this point.

Note: For first time and for routine

maintenance calibrations, make sure

the sensor and sensor cable are

installed correctly before attempting

to calibrate the instrument

To calibrate the instrument (See Figure 2-7):

1. Turn the unit on by pressing the ON/OFF (I/O) key.

2. Check the battery status via the bar graph.

3. If the LCD is not flashing, press the LOCK/UNLOCK key to

unlock the keys. LCD will flash indicating changes can be

made to the settings. If the batteries have just been installed

the LCD will flash 00.0

4. As with most oxygen analyzer(s) the highest level of

accuracy is achieved when calibration is conducted using

100% oxygen. After installing the flow diverter as noted in

Section 2.1.1, insert the sensor into the plastic tee and

connect to a supply of pure dry oxygen flowing at 1-2 liters

per minute.

Note: An accessory calibration assembly (P/N C53790) is

available from Teledyne for use with the R17MED sensor

Figure 2-7: Calibration

S

Operation AX300-I

Teledyne Analytical Instruments 20

5. Wait about 20 seconds to insure the sample line is completely

purged with the calibration gas. Press the CAL key. The

LCD will count down from 9 to 0. During this time the

microprocessor is measuring the sensor output to determine

the gas concentration and selects the calibration range i.e.

100% or 20.9%. When the calibration is complete the LCD

will display the gas value. Press the LOCK/UNLOCK key to

save the calibration data.

Note: The AX300-I can only be calibrated using 100% oxygen or

room air 20.9%. Improper calibration or use of other gas

concentrations will activate the

√

SENSOR indicator. To

repeat the calibration press the LOCK/UNLOCK key and

press the CAL key.

6. Remove the sensor from the oxygen supply and confirm the

LCD reads less than 22% in room air. It is not necessary for

it to read exactly 20.9%.

7. It is important to perform the calibration carefully and

thoroughly, using calibration gases that are free from

contaminates. Wait for a stable reading before locking in

calibration point. The accuracy of the instrument is only as

good as the procedure used to calibrate it.

Note: A single point air calibration is not recommended unless

the sensor can be exposed to a known source of fresh

outdoor air. Hospital room air is often enriched with

excess oxygen, which will introduce errors into the

calibration. Air calibration should only be used for

analyzing oxygen levels between 21% and 40% and

should never be used where a high degree of accuracy

is needed.

Note: Never calibrate the unit in humidified gas, as water vapor

makes the oxygen concentration appear lower than it really

is. See Section 2.3.1: Humidity.

CAUTION: DO NOT ADJUST THE CALIBRATION SETTINGS IN

AIR AFTER THE 100% CALIBRATION, AS THIS WILL

CANCEL THE MORE ACCURATE 100%

CALIBRATION. THE 100% CALIBRATION MAY BE

REPEATED AS MANY TIMES AS DESIRED.

8. Press the LOCK/UNLOCK key to hold settings. The unit is

now ready for use.

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 21

2.1.5 Output 0-1 VDC or RS232

The AX300-I Portable Oxygen Analyzer provides signal outputs

for use with recorders and computers. These instruments are supplied

standard with a 0-1 VDC output. An optional 0-1 VDC Interface Cable

(P/N B-75554) is available from Teledyne for this purpose.

To connect the analyzer to an analog recording device:

1. Insert one end of the interface cable into the output port on

the side of the instrument. See Figure 2-8.

2. Insert the other end into the analog recorder device. Make

sure the device is equipped to handle a 0-1 VDC signal.

When properly calibrated, the output signal generated by the

analyzer is linear and proportional to the oxygen concentration.

If you requested Option-B (RS 232 digital output) at the time of

purchase, a digital RS 232 signal is output from the output port shown in

Figure 2-8. Use the optional RS 232 Interface Cable (P/N B-75555)

available from Teledyne for connection to a standard RS 232 port on a

computer or other suitably equipped digital device.

Figure 2-8: 0-1 VDC or RS 232 Digital Output Port

If your instrument is set for analog (0-1 VDC) output, you can

reconfigure it to use the digital output by changing a jumper on the

internal PC board.

To activate the digital output:

Operation AX300-I

Teledyne Analytical Instruments 22

1. Remove the batteries and remove the five screws that hold the

case together.

2. Remove the rear case section leaving the PCB in the front half of

the case.

3. Remove jumper at position JP3 and reinstall it at position JP7.

4. Replace the rear cover and secure in place with five screws.

Install the batteries and recalibrate per Section 2.1.3.

CAUTION: RECORDER/RS232 OUTPUT SIGNAL SHOULD ONLY

BE CONNECTED TO AN EN60601-1/IEC60606-1

APPROVED DEVICE.

To reconfigure the analyzer from a digital (RS 232) output to

analog (0-1 VDC) output, use the same procedure except in step 3

remove the jumper from JP7 and replace it at JP3.

2.2 Use

2.2.1 Procedure

Note: Prior to use, always test the batteries. Also check

calibration, the sensor for leaks and damage, and the

alarm settings.

The AX300-I instrument can be used to measure a gas mixture for

oxygen in two basic modes:

• In the inhalation side of breathing circuit ahead of

antibacterial filters, humidifiers and medicating devices or

other instances where gases are flowing to a patient in

breathing circuits.

• In confined volumes such as incubators or tents.

When analyzing for oxygen in breathing circuits, the flow diverter

must be used. The diverter should be screwed onto the threaded front

end of the R17MED sensor. A tee adapter (plastic, P/N A268, or metal,

P/N A283) should be placed into the circuit, and the above sensor

assembly plugged into the tee adapter. See Figure 2-3.

CAUTION: CHECK THE BREATHING CIRCUIT FOR LEAKS. BE

CERTAIN THAT THE CIRCUIT DOWNSTREAM OF

THE SENSOR DOES NOT PRODUCE ANY

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 23

BACKPRESSURE OR RESTRICTION TO FLOW.

ERRORS IN READINGS WILL RESULT IF THIS IS

NOT FOLLOWED.

THE OXYGEN SENSOR IS A NON-STERILE DEVICE

AND SHOULD BE USED IN CONJUCTION WITH AN

ANTIBACTERIAL FILTER. ALWAYS INSTALL THE

SENSOR ON THE INSPIRED LINE AHEAD OF

FILTERS, HUMIDIFIERS AND MEDICATING DEVICES.

NEVER INSTALL THE SENSOR IN A LOCATION

THAT WILL EXPOSE THE SENSOR TO PATIENTS

EXHALED BREATH OR SECRETIONS UNLESS YOU

INTEND TO DISPOSE OF THE SENSOR AND FLOW

ADAPTER AFTER USE.

When analyzing for oxygen in confined volumes such as

incubators, hoods, etc., the flow diverter must be removed from the

R17MED sensor so that it does not interfere with the rapid exchange of

gases to and from the sensing surface of the sensor.

CAUTION: FAILURE TO REMOVE THE DIVERTER IN THESE

APPLICATION AREAS WILL RESULT IN A MARKED

LOWERING OF THE RESPONSE TIME OF THE

SENSOR.

The R17MED sensor can be placed or hung inside incubators, tents,

etc. When it is necessary to thread the cable through a small hole in

order to gain access to the inside of a chamber, the cable should be

disconnected at the sensor, threaded through the hole, and reconnected

inside the chamber.

The LOCK/UNLOCK key can be used to lock out any accidental

interference to the front panel keys. The LOCK/UNLOCK key acts as a

toggle, pressing LOCK/UNLOCK once renders inactive all keys except

the ALARM SILENCE () key. Pressing LOCK/UNLOCK a second

time unlocks the keypad.

Operation AX300-I

Teledyne Analytical Instruments 24

2.3 Gas Sampling

2.3.1 Humidity

Humidity does not directly affect the accuracy of the sensor's

measurement. However, when a nebulizer or other device is used to

increase moisture levels in gas mixtures, the moisture actually dilutes

the mixture. This dilution effect decreases the oxygen concentration.

For example, if an 80% oxygen gas mixture is humidified to

saturation at room temperature, the resulting gas mixture will contain

only 77.5% oxygen. Your portable oxygen analyzer accurately measures

decreases in the oxygen concentration due to the dilution effects of

moisture added to gas mixtures.

As with all oxygen sensors, excessive condensation on the sensing

surface of the R17MED will block the diffusion of oxygen to the sensor,

rendering it inoperative. We recommend installing the sensor on the dry

side of the breathing circuit at all times.

2.3.2 Temperature

The R17MED oxygen sensor adjusts for ambient temperature

changes in the range of 0–40°C (32–106°F). Since the thermistor that

compensates for these changes is located in the rear of the sensor

assembly, it is important that gas mixtures, flowing over the front of the

sensor, be at room temperature. Reading errors may occur if hot gases

from a heated humidifier are directed past a sensor teed into a breathing

circuit.

A small thermal tracking error may be encountered in application

areas where the entire sensor assembly is placed in the gas mixture to be

analyzed (e.g., incubators). Holding the sensor in your hand for more

than a few minutes can also affect the temperature tracking which

appears as a slow drift on the LCD. No adjustments should be made

during this period since this error will be eliminated when both the

thermistor and sensing electrode have had sufficient time to come to

thermal equilibrium. This can take up to 2 hours.

2.3.3 Pressure

Virtually all gas sensors and analyzers measure the partial pressure,

not the percentage, of the gas that they sense. The only time that these

instruments can accurately read percentages is when the total pressure

does not vary over time between calibrations and use. For this reason it

is important to calibrate the AX300-I oxygen sensor at regular intervals.

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 25

It is recommended that the unit be calibrated prior to each use or every 8

hours.

When the sensor is connected to a ventilator circuit, the alternating

“breathing” pressure cycles generated by the ventilator will be sensed as

an increase in the oxygen percentage (especially if the sensor is fast

enough to sense the changes, as is the R17MED). In reality, the

percentage of oxygen is not changing; it is the total pressure that is

increasing producing a corresponding increase in the partial pressure of

oxygen. A hundred centimeter of water pressure pulse will produce a

0.11 atmosphere, or an 11% increase in the total and therefore partial

pressure of oxygen. Assuming that the sensor is fast enough to track this

pressure pulse, an un-pressurized reading of 50% oxygen will increase

to 55.3% if the sensor is subjected to a pressure cycle of 100cm H2O.

The reading will rise proportionally less for smaller pressures.

2.3.4 Discrepancy in Readings

The AX300-I instrument should be used to measure the oxygen

concentration exiting another oxygen mixing device or life support

system (i.e., a blender, incubator or anesthesia machine). The

information obtained from the AX300-I should never be used to adjust a

life-support system, but should only be used as an indication that the life

support system or device may require service and/or calibration.

When a discrepancy in oxygen readings is detected, the oxygen

analyzers readings should be verified by checking the AX300-I battery

condition and calibration using 100% oxygen. If the analyzer can be

calibrated, the unit can be assumed to be in good working order and

capable of providing readings to specification. If, after reinstalling the

unit, the discrepancy in oxygen readings persists, the problem is most

likely elsewhere (i.e., flow blockage, primary device error, etc.). Further

investigation should be made until the discrepancy in readings is

resolved. The troubleshooting section of this manual may provide

additional assistance in locating the problem.

Note: The MSDS on this material is available upon request

through the Teledyne Environmental, Health and Safety

Coordinator. Contact at (626) 934-1592

2.3.5 Anesthetic Gases

2.3.5.1 GASES THAT INDUCE READING ERROR

When using the R17MED sensor in the presence of anesthetic gases

such as Halothane, the oxygen reading may fall (see Table below). The

Operation AX300-I

Teledyne Analytical Instruments 26

magnitude of this error will depend upon the level of oxygen and the

duration of exposure.

The anesthetic agents listed in the following table (Halothane,

Enflurane, Isoflurane, Sevoflurane, and Desflurane) were vaporized into

a stream of 30% oxygen / 70% nitrous oxide, and the resulting drops in

oxygen level after an exposure of approximately two hours were noted.

Exposures in excess of two hours may produce slightly greater

errors. The errors listed are typical for all oxygen sensors such as the

R17MED. Exposing the sensor to air or gases that do not contain

anesthetic agents for a period of time equal to or greater than the exposure

interval will eliminate the reading error in most cases.

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 27

Table 2-1: Oxygen Reading Error in a Mixture of Anesthetic Gas

Gas or Vapor Level

(Balance: Mixture of 30% O2 / 70% N2O, except where noted)

Gas or Vapor Test Level Oxygen Reading

Error

Helium 50%, balance O2 0%

Nitrous Oxide 80%, balance O2 0%

Carbon Dioxide 10%, balance O2 0%

Halothane 4% < 1.5% O2 *

Enflurane 5% < 1.5% O2 *

Isoflurane 5% < 1.5% O2 *

Sevoflurane 5% < 1.5% O2 *

Desflurane 15% < 1.5% O2 *

* Errors are approximate and may vary based on exposure times and

concentrations.

These performances meet or exceed the requirements of ISO 7767:

1997 (E).

CAUTION: THE AX300-I SHOULD NOT BE USED IN THE

PRESENCE OF FLAMMABLE ANESTHETICS SUCH

AS DIETHYL ETHER OR CYCLOPROPANE.

CAUTION: THE AX300-I, OXYGEN SENSOR AND ASSOCIATED

HARDWARE ARE NON-STERILE DEVICES. DO NOT

AUTOCLAVE THE INSTRUMENT OR SENSOR, AS

THIS WILL DAMAGE THE EQUIPMENT.

2.3.5.2 CARE AFTER USE IN NITROUS OXIDE

CAUTION: THE R17MED SENSOR SHOULD NOT BE LEFT IN

NITROUS OXIDE MIXTURES ANY LONGER THAN

ABSOLUTELY NECESSARY.

After exposure to nitrous oxide mixtures, the sensor should be left

in 100% oxygen overnight (e.g., left in a breathing circuit that has been

flushed with pure oxygen). If this is not practical, when using the tee,

remove the plastic flow diverter and leave the sensor in room air. If the

Operation AX300-I

Teledyne Analytical Instruments 28

oxygen reading continues to drop after each use in nitrous oxide the

sensor should be removed from service. If the sensor can no longer be

calibrated or if there is any sign of electrolyte leakage, the sensor should

be disposed of in accordance with local regulations and the Material

Safety Data Sheet (MSDS) available through Teledyne.

2.3.6 Cleaning

The AX300-I and R17MED sensor are non-sterile devices.

The oxygen analyzer, oxygen sensor, and sensor interconnection

cable may be cleaned by wiping the surfaces with isopropyl alcohol or a

mild cleaning solution.

Before placing instrument in operation make sure all surface are

dry and unit is properly calibrated.

When cleaning do not allow liquids or moisture to enter the

instrument or sensor internal cavities. Do not allow the cleaning solution

to come in contact with the electrical connections. Do not immerse the

instrument, oxygen sensor or sensor interconnection cable in water or

any other liquid.

Do not expose the instrument, oxygen sensor and interconnection

cable to steam, ethylene oxide, or radiation sterilization.

2.4 Do’s and Don’ts

– DO –

• Read all of the directions before using for the first time.

• Calibrate every 8 hours or before every use.

• Visually inspect the sensor for leakage before each use.

• Calibrate using 100% oxygen and check in air.

• Test batteries regularly and replace when battery indicator

shows low battery (no bars remaining)

• Make sure keys are locked by using the LOCK/UNLOCK

key feature.

• Keep the unit, sensor and connections dry, or on the dry side

of the breathing circuit.

• Recalibrate after replacing the batteries.

Portable Oxygen Analyzer Operation

Teledyne Analytical Instruments 29

• Recalibrate after replacing the sensor.

• Use properly installed alkaline batteries only.

• Make sure the R17MED sensor is properly attached.

• Remove the plastic flow diverter only when using the tee adapter.

• Remove and save the plastic flow diverter when using the

sensor in non-flowing applications (incubators, tents, etc.)

• Clean the case with isopropyl alcohol or mild detergent only.

– DON’T –

• Use this analyzer if you suspect any malfunction.

• Use the instrument in the presence of flammable gases.

• Use anything but alkaline batteries.

• Autoclave or freeze the sensor or instrument.

• Open or try to repair a leaking or broken sensor.

• Immerse the unit or sensor in any liquid.

• Pass hot or cold gas mixtures over the sensor.

• Adjust the reading in air after 100% calibration

• Expose the unit to devices that produce high levels of radio,

short wave, microwave, x-ray, or high frequency

interference.

• Use cleaning agents or liquids in the cable receptacles or

around the battery compartment.

• Place the unit itself in a water vapor-saturated environment.

• Expose the LCD to excessive sunlight.

• Expose the unit to a condensing water environment such as a

mist tent.

Operation AX300-I

Teledyne Analytical Instruments 30

BLANK

Portable Oxygen Analyzer Service Manual

Teledyne Analytical Instruments 31

Service Manual

3.1 General Service Information

The Teledyne Model AX300-I portable oxygen analyzer is designed to be

robust yet compact in size. In order to achieve maximum reliability in a

microprocessor-based instrument, a single PC board is used which relies exclusively

on surface mount technology. Without access to specialized probes and test

equipment, troubleshooting and repair of circuit board components are not feasible.

A factory replacement of the entire PC board is more cost effective than a field

repair of an individual component.

With the exception of replacing the sensor or batteries there are no user-

serviceable components inside the unit. There are no potentiometers or other

adjustments to be made within this instrument. If a problem arises with either of

these models that cannot be corrected by recalibration, changing the batteries or

replacing the sensor as described in this manual, the unit must be sent back to the

factory for repair or replacement. See Section 3.10 for instructions on obtaining a

Return Merchandise Authorization (RMA) number before sending a unit back to

Teledyne for repair.

3.2 Overall Maintenance

The AX300-I instrument requires very little maintenance, other than

calibration, checking and changing the batteries and sensor, and cleaning the

plastic housing. Occasional cleaning of the plastic surface can be done with

isopropyl alcohol. Should any part of the instrument malfunction or fail to

perform, the unit should be removed from service. There are no user-serviceable

components within the instrument.

3.3 Battery Maintenance

DO: Test batteries regularly. (replace immediately when all 5 bars are

missing).

DO: Always use alkaline batteries.

DO: Recalibrate after replacing batteries.

The AX300-I instrument incorporates a bar graph that continuously displays

the approximate amount of useful life remaining on the set of installed batteries.

Service Manual AX300-I

Teledyne Analytical Instruments 32

Excessive alarm activation will wear down the battery faster than usual. The

minimum detectable change in battery voltage corresponds to an increment of

about 50 hours, meaning that the battery voltage reading may not change for

several hours at a time.

If the analyzer is not used for a period of 30 days or more, the batteries

should be removed prior to storage.

3.4 Sensor Maintenance

DO: check the sensor for damage or leaks before use.

DO: recalibrate after replacing the sensor.

DON’T: immerse the R17MED sensor in liquid.

DON’T autoclave the R17MED sensor.

DON’T: open or try to repair the sensor.

Before every use, the sensor, cable and connections should be checked.

Check the sensor for leaks and condensation. Check the cable for splitting or

cracked insulation. Make sure the connections are tight and dry.

In the event that the sensor has been damaged, consult the Material Safety

Data Sheet in the Appendix for handling guidelines.

3.5 Calibration

Incorrect readings can often traced to improper calibration. The AX300-I

should be calibrated before each use and every 8 hours to maintain accuracy. It

must be calibrated whenever new batteries are installed. Calibration using

methods other than described below can lead to improper operation and are

discouraged.

Whenever new batteries are installed or removed for any reason, the oxygen

analyzer defaults to the calibration mode with the LCD display flashing 00.0.

Only the CAL and ON/OFF (I/O) keys are functional at this point.

To calibrate the instrument refer back to Section 2.1.4.

.

Portable Oxygen Analyzer Service Manual

Teledyne Analytical Instruments 33

3.6 Gas Sampling

3.6.1 Humidity

Humidity does not directly affect the accuracy of the sensor's measurement.

However, when a nebulizer or other device is used to increase moisture levels in

gas mixtures, the moisture actually dilutes the mixture. This dilution effect

decreases the oxygen concentration.

For example, if an 80% oxygen gas mixture is humidified to saturation at

room temperature, the resulting gas mixture will contain only 77.5% oxygen.

Your portable oxygen analyzer accurately measures decreases in the oxygen

concentration due to the dilution effects of moisture added to gas mixtures.

As with all oxygen sensors, excessive condensation on the sensing surface

of the R17MED will block the diffusion of oxygen to the sensor, rendering it

inoperative. We recommend installing the sensor on the dry side of the breathing

circuit at all times.

3.6.2 Temperature

The R17MED oxygen sensor adjusts for ambient temperature changes in the

range of 0–40°C (32–106°F). Since the thermistor that compensates for these

changes is located in the rear of the sensor assembly, it is important that gas

mixtures, flowing over the front of the sensor, be at room temperature. Reading

errors may occur if hot gases from a heated humidifier are directed past a sensor

teed into a breathing circuit.

A small thermal tracking error may be encountered in application areas

where the entire sensor assembly is placed in the gas mixture to be analyzed

(e.g., incubators). Holding the sensor in your hand for more than a few minutes

can also affect the temperature tracking which appears as a slow drift on the

LCD. No adjustments should be made during this period since this error will be

eliminated when both the thermistor and sensing electrode have had sufficient

time to come to thermal equilibrium. This can take up to 2 hours.

3.6.3 Pressure

Virtually all gas sensors and analyzers measure the partial pressure, not the

percentage, of the gas that they sense. The only time that these instruments can

accurately read percentages is when the total pressure does not vary over time

between calibrations and use. For this reason it is important to calibrate the

AX300-I oxygen sensor at regular intervals. It is recommended that the unit be

calibrated prior to each use or every 8 hours.

Service Manual AX300-I

Teledyne Analytical Instruments 34

When the sensor is connected to a ventilator circuit, the alternating

“breathing” pressure cycles generated by the ventilator will be sensed as an

increase in the oxygen percentage (especially if the sensor is fast enough to sense

the changes, as is the R17MED). In reality, the percentage of oxygen is not

changing; it is the total pressure that is increasing producing a corresponding

increase in the partial pressure of oxygen. A hundred centimeter of water

pressure pulse will produce a 0.11 atmosphere, or an 11% increase in the total

and therefore partial pressure of oxygen. Assuming that the sensor is fast enough

to track this pressure pulse, an un-pressurized reading of 50% oxygen will

increase to 55.3% if the sensor is subjected to a pressure cycle of 100cm H2O.

The reading will rise proportionally less for smaller pressures.

3.6.4 Discrepancy in Readings

The AX300-I instrument should be used to measure the oxygen

concentration exiting another oxygen mixing device or life support system (i.e., a

blender, incubator or anesthesia machine). The information obtained from the

AX300-I should never be used to adjust a life-support system, but should only be

used as an indication that the life support system or device may require service

and/or calibration.

When a discrepancy in oxygen readings is detected, the oxygen analyzers

readings should be verified by checking the AX300-I battery condition and

calibration using 100% oxygen. If the analyzer can be calibrated, the unit can be

assumed to be in good working order and capable of providing readings to

specification. If, after reinstalling the unit, the discrepancy in oxygen readings

persists, the problem is most likely elsewhere (i.e., flow blockage, primary

device error, etc.). Further investigation should be made until the discrepancy in

readings is resolved. The troubleshooting section of this manual may provide

additional assistance in locating the problem.

Note: The MSDS on this material is available upon request through the

Teledyne Environmental, Health and Safety Coordinator. Contact

at (626) 934-1592

3.6.5 Anesthetic Gases

3.6.5.1 GASES THAT INDUCE READING ERROR

When using the R17MED sensor in the presence of anesthetic gases such as

Halothane, the oxygen reading may fall (see Table below). The magnitude of this

error will depend upon the level of oxygen and the duration of exposure.

The anesthetic agents listed in the following table (Halothane, Enflurane,

Isoflurane, Sevoflurane, and Desflurane) were vaporized into a stream of 30%

Portable Oxygen Analyzer Service Manual

Teledyne Analytical Instruments 35

oxygen / 70% nitrous oxide, and the resulting drops in oxygen level after an

exposure of approximately two hours were noted.

Exposures in excess of two hours may produce slightly greater errors. The

errors listed are typical for all oxygen sensors such as the R17MED. Exposing the

sensor to air or gases that do not contain anesthetic agents for a period of time

equal to or greater than the exposure interval will eliminate the reading error in

most cases.

Table 3-1: Oxygen Reading Error in a Mixture of Anesthetic Gas

Gas or Vapor Level

(Balance: Mixture of 30% O2 / 70% N2O, except where noted)

Gas or Vapor Test Level Oxygen Reading

Error

Helium 50%, balance O2 0%

Nitrous Oxide 80%, balance O2 0%

Carbon Dioxide 10%, balance O2 0%

Halothane 4% < 1.5% O2 *

Enflurane 5% < 1.5% O2 *

Isoflurane 5% < 1.5% O2 *

Sevoflurane 5% < 1.5% O2 *

Desflurane 15% < 1.5% O2 *

* Errors are approximate and may vary based on exposure times and

concentrations.

These performances meet or exceed the requirements of ISO 7767: 1997 (E).

CAUTION: THE AX300-I SHOULD NOT BE USED IN THE PRESENCE OF

FLAMMABLE ANESTHETICS SUCH AS DIETHYL ETHER OR

CYCLOPROPANE.

CAUTION: THE AX300-I, OXYGEN SENSOR AND ASSOCIATED

HARDWARE ARE NON-STERILE DEVICES. DO NOT

AUTOCLAVE THE INSTRUMENT OR SENSOR, AS THIS WILL

DAMAGE THE EQUIPMENT.

Service Manual AX300-I

Teledyne Analytical Instruments 36

3.6.5.2 CARE AFTER USE IN NITROUS OXIDE

CAUTION: THE R17MED SENSOR SHOULD NOT BE LEFT IN NITROUS

OXIDE MIXTURES ANY LONGER THAN ABSOLUTELY

NECESSARY.

After exposure to nitrous oxide mixtures, the sensor should be left in 100%

oxygen overnight (e.g., left in a breathing circuit that has been flushed with pure

oxygen). If this is not practical, when using the tee, remove the plastic flow

diverter and leave the sensor in room air. If the oxygen reading continues to drop

after each use in nitrous oxide the sensor should be removed from service. If the

sensor can no longer be calibrated or if there is any sign of electrolyte leakage,

the sensor should be disposed of in accordance with local regulations and the

Material Safety Data Sheet (MSDS).

Note: The MSDS on this material is available upon request through the

Teledyne Environmental, Health and Safety Coordinator. Contact

at (626) 934-1592

3.7 Troubleshooting

The AX300-I oxygen analyzer provides a variety of built-in safety features that

prevent its use when a fault is detected. When a unit displays the message √ SENSOR

and sounds the audible and visual alarm continuously, it is an indication of a faulty

connection between the sensor and the unit or an expired or faulty sensor. To

determine where the difficulty lies, refer to the following guidelines in Table 3-2.

Table 3-2 Troubleshooting

Symptom Why What To Do

New sensor responds

slow or drifts.

If the sensor is new

and was just

removed from its

sealed bag it may

need to run for

several hours.

A) Wait 1–2 hours and

recalibrate.

Sensor will not read

below 22 % after

calibration in 100% O2.

Calibration in 100%

was invalid or the

room air is

contaminated with

excess oxygen.

A) Recalibrate using dry gas

making sure the reading

stabilizes before making

any adjustments.

B) Make sure that at least 6" (30

cm.) of tubing is attached to

the exhaust side of the tee

Portable Oxygen Analyzer Service Manual

Teledyne Analytical Instruments 37

adapter to prevent back filling.

O2 flow rate should not

exceed 5 l/min.

C) Oxygen concentration at the

sensor is significantly higher

than 21%. Take the

instrument to a well-

ventilated area and check

the reading again.

E) Try calibrating with a known

good sensor; if this fails, see

symptom "Reading drifts

over 2–3%..."

The sensor does not

react to changes in

oxygen concentration,

or the readings are

unstable and drifting.

Water is condensing

on the sensing

surface.

Electrical interference

is disrupting the

electronics

A) Remove the sensor from tee

adapter and unscrew the

plastic flow diverter. Using

absorbent tissue or cotton

swab, gently wipe off sensing

surface inside threaded

portion of sensor assembly.

B) Relocate unit away from

sources of electrical noise

such as cauterizing equipment

and two-way radios.

The display is flashing

√ SENSOR

The unit has detected

a fault in the signal

from the sensor.

Sensor has expired.

The sensor has been

exposed to a gas

containing little or no

oxygen.

A) Check sensor cable

connections and make sure

they are completely

inserted into the mating

connector and the capture

nut is firmly in place.

B) Expose the sensor in 100%

O2 and check calibration.

C) The sensor output has

fallen to a level where it is

no longer usable. Replace

sensor.

The oxygen reading

fluctuates or appears to

be incorrect.

Like all O2 sensors,

the R17MED detects

the changes in the

partial pressure of

O2.

A) During calibration, make

sure there is no restrictions

on exhaust side of sensor. If

the reading changes with

flow, the sensor is

pressurized or there may be

a leak in the system.

B) If a high degree of accuracy

is desired, or the

Service Manual AX300-I

Teledyne Analytical Instruments 38

concentration of O2 is in

excess of 40%, calibration

with 100% is recommended.

C) If humidified gas is used to

ventilate the patient, water

vapor actually dilutes the

gas. See Appendix:

Humidity, Temperature.

D) If a blender is used, check

its calibration. See

Appendix: Discrepancy in

Readings.

The unit has stopped

working and the LCD is

displaying

alphanumeric figures.

The AX300-I unit is

equipped with an

electronic "watch dog,"

which analyzers the

circuitry within the unit

for potential faults and

renders the unit

inoperable until the

condition is corrected.

(See Watch dog

section below)

Several conditions can

activate the "watch

dog." Dropping the

unit, poor battery

connections, and radio

frequency interference

are the most common

causes. See the watch

dog section for

additional information

A) Disconnect the batteries and

inspect the contacts for

corrosion. Reconnect the

batteries. If the unit functions

properly, calibrate the unit

and reset the alarm values.

B) Try a new set of batteries.

C) Increase the distance

between the unit and any

source of radio frequency

interference. The sensor

cable is a prime source of

pickup as it can act like an

antenna. Relocate the

sensor cable and if possible

change its coiled length to

“de-tune” its antenna effect.

Placing the cable in a

different position may also

help.

No display. A) Batteries expired.

B) Bad battery

connection.

A) Check/replace batteries.

B) Check battery connections.

C) Calibrate.

Keys inoperable/cannot

turn unit off

The LOCK/UNLOCK

key is activated which

is preventing key

operation

A) Press LOCK/UNLOCK key

once. LCD will flash

indicating keys are active.

Cannot adjust

calibration

Critical settings require

two keys be pressed in

a specific order.

LOCK/UNLOCK key is

active

A) If display is not flashing

press lock key once to

activate keys. Press desired

function followed by the Up

and Down key.

Portable Oxygen Analyzer Service Manual

Teledyne Analytical Instruments 39

Note: In the event that none of these procedures produce desired results, remove

the batteries and return the unit to Teledyne for repair.

3.8 Watchdog

The AX300-I is equipped with a watchdog circuit that continuously analyzers the

electronics for proper operation. If the watchdog detects a failure, one of the following

codes will appear on the LCD.

The error codes can appear on the LCD when batteries are first installed,

during normal operation or if the unit is subjected to extreme shock. In some

cases an additional digit is used in the error code to supply additional

information. For example, the error code 6 and 7 are followed by another digit

listed as (N) in Table 3.3. The error code 65 would indicate that a key is stuck

and this key is the Silence key.

In addition to supplying visual error codes, the audio device will beep a

number of times to indicate the general error in case the display is not functional.

Note: To reset the watchdog error code. Remove one battery for 5

seconds and replace. If the error persists contact your locale

representative or Teledyne for assistance.

Table 3-3 Error Codes

Error Code Audio Beeps Error

Indeterminate 2 The watchdog timer has timed out indicating

a serious software error

30 3 Analog output is different from the expected

value. May indicate a shorted or over-loaded

analog output or a failure of the analog to

digital converter or digital to analog

converter circuit.

50 5 The ADC circuit failed during POST.

Service Manual AX300-I

Teledyne Analytical Instruments 40

6 (5) 6

(There is no

indication of

which key is

stuck)

A stuck key has been detected. The second

digit example (5) on the display shows

which key is stuck:

1 - Batt

2 - Cal

5 - Silence

8 - Key Lock

7(2) 7

(There is no

indication of

the type of

DAC failure)

A failure has occurred during the automatic

calibration of the digital to analog converter

(DAC) circuit. The second digit example (2)

shows the type of digital to analog failure.

0 - Measurement

1 - High Test

2 - Low Test

3 - Offset Cal

4 - Gain Cal

3.9 Other Problems with the Instrument

Most other problems arise from either mechanical damage from the

instrument falling from a bench or table, or electronic component

failure. In these units, repair or troubleshooting the PCB or individual

component on the board is not feasible. It requires specialized test

equipment and probes not generally available to the public. Under most

circumstances a replacement of the entire PC Board is recommended.

The instrument must be returned to the factory for PCB installation.

Occasionally, depending on the environment of use, keys can

become stuck or function erratically due to contamination. Use a mild

non-abrasive cleaner solution to periodically clean the keypad and

screen. An aerosol jet spray of the type commonly used to clean

computer keyboards can be used to dislodge dirt and accumulations

from the keypad.

The Error Code Table (Table 3-3) includes a description of certain fault

codes, which are diagnostic of some common (usually electronic) problem

with the instrument. Some of these codes refer to specific components on the

PCB that are problematic or have failed. These codes are useful in reporting

Portable Oxygen Analyzer Appendix

Teledyne Analytical Instruments 41

a problem with your instrument to Teledyne Customer Service. If an error

code is indicated on your analyzer record the number and report it to the

Customer Service Department at the address below.

3.10 Return Authorization for Service

For any service beyond sensor and battery replacement, the

instrument must be returned to the factory. A return merchandise

authorization (RMA) number must be obtained from Teledyne

Analytical Instruments prior to returning an instrument for service. You

can request a RMA number via email by contacting us at:

tetci_customerservice@teledyne.com

You can also contact us at the address below.

Customer Service Department

TELEDYNE Analytical Instruments

16830 Chestnut Street

City of Industry, CA 91749-1580 USA

Phone (626) 934-1500, Fax (626) 961-2538

Or via the web at: www.teledyne-ai.com

Appendix

A.1 Specifications

Range: 0-100% oxygen

Accuracy: +2% of full scale (at constant temperature

and pressure)

Response Time: 90% in less than 8 seconds at 25 °C

Battery Life: Approximately 2000 hr. continuous use in

a non-alarm condition

System Power: 3 AA alkaline batteries.

Sensor Type: Class R17MED

Appendix AX300-I

Teledyne Analytical Instruments 42

Expected Life: 36 months in air. (10 months when

continuously exposed to 100% oxygen)

Dimensions: 2.5" W × 1.25" D × 4.5" H (66 mm x 33-

mm × 111.5 mm)

Sensor Cable: Retracted: 2 ft / Extended: 10 ft.

Storage Temp. 10-30 °C (continuous), 5-50 °C

(Intermittent)

Operating Temp: 0-40 °C

Portable Oxygen Analyzer Appendix

Teledyne Analytical Instruments 43

A.2 Spare Parts List

QTY PART NO DESCRIPTION

1 C43690-R17MED Micro-Fuel Cell R17MED with

flow diverter P/N A50057

3 B99 “AA” size alkaline battery

1 B69934 Cable assembly

1 A268 Tee adapter (22 mm)

1 B-74543-B Front panel assembly (AX300-I)

1 D-74459 Back panel

1 C-74461 Battery door

1 B-74462 Battery door lock

1 B-74463 Mounting clip

1 B-74466 Base assembly

A.3 Optional Accessories

1 A50057 R17MED flow diverter

1 CP2345 Universal Pole Mounting Clamp

1 CP2344 “V” mount Pole Clamp

1 B647 “V” mount Wall Adapter

1 A51589 Sensor adapter cap, female (22 mm)

1 A51588 Sensor adapter cap, male (22 mm)

1 C53790 Calibration assembly

1 A284 Universal adapter set for pediatric

circuits (15mm)

1 A274 Tee adapter, autoclavable

1 A283 Tee adapter, metal

1 B-75554 0-1 VDC Interface Cable

1 B-75555 RS 232 Interface Cable

Schematics are available on request.

____________________

A minimum charge is applicable to spare parts orders.

Note: Orders for replacement parts should include the part

number (if available) and the model and serial number of

Appendix AX300-I

Teledyne Analytical Instruments 44

the instrument for which the parts are intended.

Orders should be sent to:

TELEDYNE Analytical Instruments

16830 Chestnut Street

City of Industry, CA 91749-1580

Phone (626) 934-1500, Fax (626) 961-2538

Web: www.teledyne-ai.com

or your local representative.

Portable Oxygen Analyzer Appendix

Teledyne Analytical Instruments 45

BLANK

Appendix AX300-I

Teledyne Analytical Instruments 46

Index

accessories, 46

accuracy, 45

address, 43, 47

ALARM SILENCE button, 10, 13, 15

amplification, 13

analog output, 22

analysis range, 10, 45

anesthetic gas, 27, 37

anode, 12

audio alarm, 13

bar graph indicator, 20

batteries, 10, 19

battery compartment, 19

battery installation, 19

battery status indicator, 10

breathing circuits, 24

cable, 16

calibration, 20, 21, 34

calibration interval, 26, 36

cathode, 12

CHECK SENSOR button, 10, 12, 38

confined volumes, 24

copyright, ii

current output. See output

diffusion sampling, 17

digital output, 23

dilution effects, 25, 35

display, 9

diverter, 13, 17, 24, 29, 38

drift, 26, 35

electrolyte, 12

error, 27, 28, 37

error code, 41, 42

FCC, ii

features, 11

front panel AX300, 9

galvanic cell, 12

humidity, 25, 35

intended use warning, iv

jumper, 23

linear, 10, 22

LOCK/UNLOCK button, 15

maintenance, 33

moisture, 25, 35

mounting bracket, 15

nebulizer, 25, 35

nitrous oxide, 28, 38

optional accessories. See accessories

output, 12

output port, 23

oxygen sensor, 12

partial pressure, 26, 35

power, 15

power requirements, 10, 45

R17MED, 10, 12, 24, 28, 34, 38

reading discrepancy, 26, 36

reading error, 25, 27, 35, 37

rear panel, 18

reconfiguring output, 23

resetting alarms, 10

response, 45

restriction on selling. See sale

restriction

safety information, iv

sale restriction, ii

sensor, 10, 12

sensor cable, 45

sensor failure alarm, 10

sensor life, 45

sensor maintenance, 34

sensor mounting, 17

set up, 15

signal output, 22

signal processing, 13

signal processor, 12

spare parts listing, 46

specifications, 45

stand, 15

standards, 10

storage, 34

tables listing, viii

tee adapter, 24

Teledyne address, 43, 47

temperature, 25, 35

temperature tracking, 26, 35

thermal equilibrium, 26, 35

Portable Oxygen Analyzer Index

Teledyne Analytical Instruments 47

thermal tracking error, 26, 35

thermistor, 25, 35

troubleshooting, 38

type B equipment, i

ventilator, 26, 36

warranty, ii

watchdog circuit, 41

water vapor, 22

website address, 43, 47