Teledyne Respiratory Product MX300 I User Manual

Portable Oxygen Monitor

OPERATING & SERVICE INSTRUCTIONS FOR

MX300-I

PORTABLE OXYGEN MONITOR

P/N M75707

REV 1

ECO # 04-0088

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).

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Portable Oxygen Monitor

About This Manual

The MX300-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 monitor 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 monitor 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 monitor, 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 MX300-I Portable Oxygen Monitor. After you have used it to

initially install your monitor, 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.

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MX300-I

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 MONITOR 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.

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Portable Oxygen Monitor

Table of Contents

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

List of Figures................................................................................v

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

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

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

1.1 Applicable Standards

1.2 Features

1.3 Options

1.4 Applications

1.5 Theory of Operation

1.5.1 Sensor

1.5.2 Signal Processing

Operation .....................................................................................15

2.1 Setup

2.1.1 Sensor Installation or Replacement

2.1.2 Mounting

2.1.2.1 V-Mount Adapter Installation

2.1.2.2 Universal Mounting Clamp Installation

2.1.3 Battery Installation

2.1.3 Calibration

2.1.4 Alarms

2.1.5 Output 0-1 VDC or RS232

2.2 Use

2.2.1 Procedure

2.3 Gas Sampling

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2.3.1 Humidity

2.3.2 Temperature

2.3.3 Pressure

2.3.4 Discrepancy in Readings

2.3.5 Anesthetic Gases

2.3.5.1 Gases That Induce Reading Error

2.3.5.2 Care After Use in Nitrous Oxide

2.3.6 Cleaning

2.4 Do’s and Don’ts

Service Manual............................................................................ 33

3.1 General Service Information

3.2 Overall Maintenance

3.3 Battery Maintenance

3.4 Sensor Maintenance

3.5 Calibration

3.6 Alarms

3.7 Gas Sampling

3.7.1 Humidity

3.7.2 Temperature

3.7.3 Pressure

3.7.4 Discrepancy in Readings

3.8 Troubleshooting

3.9 Watchdog

3.10 Other Problems with the Instrument

3.11 Return Authorization for Service

Appendix...................................................................................... 43

A.1 Specifications

A.2 Spare Parts List

A.3 Optional Accessories

Index............................................................................................. 47

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Portable Oxygen Monitor

List of Figures

Figure 1-1: MX300-I Front View ......................................................9

Figure 2-1: Installing the R17MED Sensor ....................................16

Figure 2-2: Sensor Cable Connection to Monitor .........................17

Figure 2-3: Mounting the Sensor in the Tee Adapter.....................17

Figure 2-4: V-Mount Adapter Installation.......................................18

Figure 2-5: Brass Insert for Universal Mounting Clamp.................18

Figure 2-6: Installing Batteries.......................................................19

Figure 2-9: 0-1 VDC or RS 232 Digital Output Port.......................24

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MX300-I

List of Tables

Table 2-1: Oxygen Reading Error in a Mixture of Anesthetic Gas. 29

Table 3-1 Troubleshooting ............................................................ 37

Table 3-2 Error Codes................................................................... 40

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Portable Oxygen Monitor

Introduction

Teledyne Analytical Instruments MX300-I Oxygen Monitor with

alarms here after referred to as MX300-I is a portable instrument that

provides fast and accurate oxygen monitoring and incorporates an

audio/visual alarm capability. These instruments are designed to monitor

up to 100% oxygen concentration in medical gas mixtures. Because they

are microprocessor-based, the MX300-I instruments 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 MX300-I front

face interface is shown in Figure 1-1.

Figure 1-1: MX300-I 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

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MX300-I

Options for alternate display configuration). An integral battery life

indicator is displayed “on demand” with the MX300-I.

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. If the alarm

condition is not corrected within 115 seconds the alarm buzzer will

reactivate.

The MX300-I unit incorporates a dual concentration alarm with

individual user-defined set points. The set points are displayed on the

lower portion of the LCD display with the low alarm set point appearing

at the lower left and the high alarm appearing on the lower right of the

display. The alarm circuitry provides both an audible and visual alarm.

1.1 Applicable Standards

The MX300-I units are built to meet or exceed regulatory and

industry standards for use as a medical device. The 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 Monitors for Monitoring patient

Breathing Mixtures

ISO 9703-1:

ISO 9703-2:

Anesthesia and Respiratory Care Alarm Signals

Part 1

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

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Portable Oxygen Monitor

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1.2 Features

The MX300-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 MX300-I instruments:

•

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

Automatic LCD back lighting upon key press

Microprocessor controlled

Up/Down front panel controls

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

2 User defined set point controlled concentration alarms

Battery test function

1.3 Options

The following instrument options are available for the MX300-I

units:

•

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

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MX300-I

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)

1.4 Applications

The MX300-I Portable oxygen analyzer is intended to continuously

measure and display the 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.

The instruments may be used in verifying oxygen concentrations in

gas mixtures used in:

•

Anesthesia

Respiratory Therapy

Neonatal Care

1.5 Theory of Operation

The MX300-I monitor 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. The data

from the sensor is compared to the alarm values set by the user, and

activates the audible and visual alarms if the oxygen level exceeds those

values. A unique sensor fail/disconnect alarm is incorporated in the

MX300-I to warn the user of a sensor problem. The√ SENSOR indicator

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Portable Oxygen Monitor

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is illuminated on the LCD and the audible and visual alarms are

activated whenever a fault is detected.

1.5.1 Sensor

The MX300-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

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 monitoring, 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.

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MX300-I

The oxygen level is calculated and then displayed on the liquid

crystal display (LCD) on the front panel.

In the MX300-I monitor, user-programmed high and low alarm set

points are stored in random access memory (RAM), which resides within

the microprocessor. The oxygen level calculated by the microprocessor is

compared to these set points, and an alarm activated, if necessary.

The audio alarm is used for both the concentration alarms and the

sensor disconnects alarm. The user can manually bypass the

concentration alarm for a set amount of time. Pressing the ALARM

SILENCE key (ꢀ) will provide an audible alarm override for 115

seconds. After that, if the alarm condition still prevails, the audible

alarm will resume. The ALARM SILENCE key (ꢀ) can also be used

to interrupt the sensor disconnects audible alarm.

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Portable Oxygen Monitor

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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 MX300-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 MX300-I Portable Oxygen Monitor 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 MX300-I monitor:

1. Install the sensor.

2. Install the batteries.

3. Calibrate the unit.

4. Set the alarms.

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 or alarm set point value.

Note: The ALARM SILENCE (ꢀ) and BATT TEST key continue

to operate normally when the lock feature is activated.

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MX300-I

2.1.1 Sensor Installation or Replacement

Note: The R17MED oxygen sensor must be installed before the

oxygen analyzer/monitor 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.

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Portable Oxygen Monitor

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Figure 2-2: Sensor Cable Connection to Monitor

Note: When the MX300-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

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MX300-I

2.1.2 Mounting

The MX300-I can be mounted in several ways depending on the

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

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

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Portable Oxygen Monitor

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2.1.3 Battery Installation

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

before the monitor will operate. The unit must be

recalibrated whenever new batteries are installed and

the HI and LOW alarm set points must be reset to the

desired values

To install the batteries:

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

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MX300-I

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

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

until a successful calibration is achieved.

5. To test the batteries. Press the BATT TEST key once. The

battery display, located below the oxygen readout display,

should show 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.

2.1.3 Calibration

The MX300-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 monitor 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. The

alarm set points will also need to be reset after calibration

is completed.

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)

Figure 2-7: Calibration Sequence

key.

2. Check the batteries by pressing the BAT key.

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

unlock the keys. LCD will flash indicating changes can be

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Portable Oxygen Monitor

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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

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 MX300-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

monitoring oxygen levels between 21% and 40% and

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MX300-I

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 Appendix: 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. Adjust alarm set points to desired level according to the

procedures in Section 2.1.4.

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

now ready for use.

2.1.4 Alarms

Note: Before attempting to change the alarms it is necessary to

unlock the control keys by pressing the LOCK/UNLOCK

key. When pressed the display will start flashing.

To set the alarms on the MX300-I monitor (see Figure 2-8):

1. To set the HI alarm: Press the HI ALARM SET

key once. Press the UP and DOWN arrow key

until the desired value is displayed in the lower

right corner of the display.

Note: The HI and LO alarms may be defeated by

setting the HI alarm limit one step above

100%. The display will blink ALARM OFF

continually in this mode.

2. To set the LO alarm, press the LO ALARM SET

key once. Press the UP and DOWN arrow key to

select a value. A built-in safety feature will not

allow you to select a LO alarm value less than

18%.

Figure 2-8: Setting the Alarms

Note: The MX300-I Portable Oxygen Monitor is

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Portable Oxygen Monitor

Operation

designed to prevent crossing of HI/LO alarm settings. If you

attempt to set the LO alarm higher than the HI alarm, it will

push the HI alarm setting up as you continue to rise the LO

alarm set point. This also applies when attempting to set the

HI alarm lower than the LO alarm.

3. To test the alarms, unlock the controls by pressing the

LOCK/UNLOCK key and then press ALARM TEST key. The

Lo alarm followed by the HI alarm will blink and the audible

visual alarm will are activated for about 1 second.

4. To silence the alarm buzzer for 115 seconds press the alarm

silence key (ꢀ) (flashing red indicator light).

5. To disable the alarms set the high alarm set point above 100%.

Note: When the alarm is in the OFF condition (set point above

100%) the ALARM OFF status message blinks slowly on

the LCD below the oxygen readout.

2.1.5 Output 0-1 VDC or RS232

The MX300-I provides signal outputs for use with recorders and

computers. The 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 2-9.

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.

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MX300-I

Figure 2-9: 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:

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.

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Portable Oxygen Monitor

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2.2 Use

2.2.1 Procedure

Note: Prior to use, always test the batteries and alarms (if

applicable). Also check calibration, the sensor for leaks

and damage, and the alarm settings.

The AX/MX300-I instruments 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.

•

In confined volumes such as incubators or tents.

When monitoring 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 2-1.

CAUTION:

CHECK THE BREATHING CIRCUIT FOR LEAKS. BE

CERTAIN THAT THE CIRCUIT DOWNSTREAM OF

THE SENSOR DOES NOT PRODUCE ANY

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 EXPOSE THE SENSOR TO PATIENT’S

EXHALED BREATH OR SECRETIONS UNLESS YOU

INTEND TO DISPOSE OF THE SENSOR AND FLOW

ADAPTER AFTER USE.

When monitoring for oxygen in confined volumes such as

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

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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 (ꢀ) and BATT TEST keys. Pressing

LOCK/UNLOCK a second time unlocks the keypad.

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 monitor 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.

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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 monitors 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. This is way it is important to

calibrate the MX300-I oxygen sensor at regular intervals. 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 one 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.

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MX300-I

2.3.4 Discrepancy in Readings

The MX300-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 MX300-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 MX300-I battery

condition and calibration using 100% Oxygen. If the monitor 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

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.

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Operation

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

Nitrous Oxide

Carbon Dioxide

Halothane

80%, balance O₂

10%, balance O₂

15%

< 1.5% O₂*

Enflurane

Isoflurane

Sevoflurane

Desflurane

* 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 MX300-I SHOULD NOT BE USED IN THE

PRESENCE OF FLAMMABLE ANESTHETICS SUCH

AS DIETHYL ETHER OR CYCLOPROPANE.

CAUTION: THE MX300-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.

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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). Contact Teledyne for the Material Safety

Data Sheet.

2.3.6 Cleaning

The MX300-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 surfaces 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.

Check the HI and LO alarm settings prior to each use.

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•

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.

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.)

•

Perform an alarm test before each use (press the ALARM

TEST key).

Clean the case with isopropyl alcohol or mild detergent only.

– DON’T –

•

Use this monitor 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.

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•

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.

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Portable Oxygen Monitor

Service Manual

3.1 General Service Information

The Teledyne Model MX300-I Portable Oxygen Monitor 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 the users manuals, contact your locale Representative or Teledyne for

assistance. When returning the unit to the factory for repair or

replacement. See Section 3.11 for instructions on obtaining a Return

Merchandise Authorization (RMA) number before sending a unit back

to Teledyne for repair.

3.2 Overall Maintenance

The MX300-I 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.

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DO: Recalibrate after replacing batteries.

The MX300-I instrument incorporates a battery test feature that

provides the approximate amount of useful life remaining on the set of

batteries. 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 monitor 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. Contact your locale

Representative or Teledyne to receive a copy of the Material Safety Data

Sheet.

3.5 Calibration

Incorrect readings can often traced to improper calibration. The

MX300-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 monitor defaults to the calibration mode with the LCD

display flashing 00.0. Only the CAL and ON/OFF (I/O) keys are

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Portable Oxygen Monitor

Service Manual

functional at this point. After calibration is completed, the alarm set

points will need to be reset.

To calibrate the instrument refer back to Section 2.1.3.

3.6 Alarms

To set the alarms on the MX300-I monitor, refer to Section 2.1.4.

3.7 Gas Sampling

3.7.1 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 monitor 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.

3.7.2 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

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Service Manual

MX300-I

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.

3.7.3 Pressure

Virtually all gas sensors and monitors 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 MX300-I oxygen sensor at regular intervals.

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