Teledyne Ted 191 Users Manual

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TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

TED '

PORTABLE OXYGEN MONITOR

INSTRUCTION MANUAL

TYPE B EQUIPMENT: Equipment providing a particular degree of protec-

tion against electric shock, particularly regarding—

• allowable LEAKAGE CURRENT

• Reliability of the protective earth connection

(if present).

P/N TM0021

04/03/00

ECO # 00-0086

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TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

COPYRIGHT © 1996

TELEDYNE ELECTRONIC TECHNOLOGIES – 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, manual, or otherwise, without the prior written consent of Teledyne

Electronic Technologies Analytical Instruments, 16830 Chestnut Street, City of

Industry, CA 91749-1580

Phone (626) 934-1500

FAX (626) 961-2538

Technical Support: (626) 934-1673

TWX (910) 584-1887 TDYANLY COID

or your local representative.

WARRANTY STATEMENT

The electronic control and display components of the TED 191 Portable Oxygen

Monitor are warranted against defective workmanship and materials for 24

months from date of shipment from Teledyne.

The class T-7 Micro-Fuel Cell is warranted for one year 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.

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TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

TABLE OF CONTENTS

SECTION TOPIC PAGE NUMBER

INTRODUCTION 4

APPLICATIONS 5

DESCRIPTIONS OF FUNCTIONAL ZONES:

FRONT PANEL 6

REAR PANEL 7

1. OPERATIONS:

1.1 SET-UP 8

1.2 INSTALL THE BATTERIES

9

1.3 INSTALL THE SENSOR 10

1.4 CALIBRATE THE INSTRUMENT 11

1.5 NORMAL OPERATION 12

1.6 SET THE ALARMS 13

2. ANAESTHETIC AGENTS 14

3. CLEANING 15

4. DO’S AND DON’T’S 16

5. ROUTINE MAINTENANCE .17

6. TROUBLESHOOTING 18

7. TECHNICAL SPECIFICATIONS 20

8. EFFECT OF PRESSURE 22

9. EFFECT OF HUMIDITY 23

10. EFFECT OF TEMPERATURE 24

11. DISCREPANCY IN READING 25

12. REPAIR SERVICE 26

SENSOR CELL REPLACEMENT LOG 27

TECHNICAL SERVICE LOG 28

GENERAL NOTES 29

SPARE PARTS LIST 30

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TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

INTRODUCTION

The TED 191 Portable Oxygen Monitor is an easy-to-use, portable instrument that provides fast

and accurate oxygen monitoring and audio-visual alarm capability. The TED 191 is designed to

monitor concentrations of up to 100% oxygen in medical gas mixtures.

The TED 191 Portable Oxygen Monitor is designed and manufactured in accordance with strict

performance and quality protocols and subject to ISO 9002 Quality System protocols. When used

correctly, this instrument will provide you with many years of trouble free service.

The TED 191 Portable Oxygen Monitor is a compact, self-contained unit, which is battery powered

by four (4) dry cell batteries (size AA/penlight).

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TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

APPLICATIONS

The instrument is designed for the measurement of oxygen concentrations in a variety of medical

gas mixtures. It is recommended that the instrument be used only as a secondary measuring

device to verify the concentration of oxygen in gas mixtures prepared using a gas blender or

similar apparatus. The use of this monitor as a primary or only means of preparing gas mixtures is

not advised.

The monitor is capable of verifying oxygen concentrations in gas mixtures used in:

• Anesthesia

• Neonatal Intensive care

• Adult Intensive care

• Respiratory / Oxygen Therapy

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Analytical Instruments

21

30

40

50 60

70

80

90

102

21

30

40

50 60

70

80

90

102

LO

HI

X 21

TELEDYNE

% OXYGEN

OXYGEN MONITOR I O

DESCRIPTION OF FUNCTIONAL ZONES

FRONT PANEL

On / Off Switch Allows the operator to turn the instrument on and off.

Alarm Mute Switch Allows the operator to “mute” the sound of the audible alarm

signal for ± 60 seconds. During this time, a red signal lamp will

flash, indicating a “muted” alarm condition is in force.

Calibration Control Allows the operator to calibrate the instrument to one primary set

point (usually 100%) in accordance with the designated calibration

protocol. This protocol is defined further in this manual and also.

Instructions in abbreviated form can be found on the top of the

monitor casing.

High Alarm Setting Allows the operator to define a high alarm threshold limit. Range

18% to 102% - if the actual measured value as displayed on the

LCD exceeds this set threshold, an audible and visual alarm

condition will be invoked.

Low alarm setting Knob Allows the operator to define a low alarm threshold limit. Range

18% to 100% - if the actual measured value as displayed on the

LCD falls below this set threshold, an audible and visual alarm

condition will be invoked.

Liquid Crystal Display Displays measured oxygen concentration, low battery condition

and provides a visual indication of either a high (+) or low (-) alarm

threshold violation.

Alarm Mute ButtonHigh Alarm Setting Knob Calibration Control

Liquid Crystal Display (LCD) On / Off Switch

Low Alarm Setting Knob

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TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

DESCRIPTION OF FUNCTIONAL ZONES

REAR PANEL

Battery Drawer The Battery Drawer contains 4 x AA (Penlight) batteries

required to power the instrument.

Sensor Cable Connector Plug The Oxygen Sensor Connector Cable is plugged into this

“one way” socket.

Battery Drawer Sensor Cable Connector Plug

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Analytical Instruments

SECTION ONE

OPERATIONS

Note : Upon receipt, inspect the entire unit and accompanying accessories for damage or broken

or loose parts. If damaged, do not use. Notify the Shipper, and consult Teledyne

Electronic Technologies Analytical Instruments

1.1 SET-UP

To set-up your TED 191 Portable Oxygen Monitor :

1.1.1 Install the Batteries

See 1.2 below for procedure

1.1.2 Install the Sensor

See 1.3 below for procedure

1.1.3 Calibrate the Instrument

See 1.4 below for procedure

1.1.4 Normal Operation

See 1.5 below for procedure

1.1.5 Set the Alarms

See 1.6 below for procedure

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OPERATIONS

1.2 INSTALLING THE BATTERIES

Withdraw the battery drawer from the monitor casing, by grasping the side lugs located on

either side of the battery drawer, and, firmly pinching them inwards, simultaneously pull the

drawer outwards. When new, this action can be somewhat stiff and difficult to execute. Care

should be taken not to damage either the drawer or the casing of the monitor when

executing this procedure.

Fresh batteries must be inserted into the four battery recepticles located within the battery

drawer assembly. Care should be taken to ensure that the correct battery polarity is

maintained.

Caution : Improper installation of the batteries may result in heat damage to the

batteries.

Re-insert the battery drawer into the monitor casing, and close.

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Analytical Instruments

OPERATIONS

1.3 INSTALLING THE OXYGEN SENSOR

The T-7 Oxygen Sensor must be installed before the instrument can be used.

Ensure that the monitor is switched off.

Remove the 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 be damaged.

Caution: the sensor electrolyte is caustic. Do not let it come into contact with skin. If it does,

immediately flush the affective area with water. Consult the Emergency First Aid procedures

as set out in the Material Safety Data Sheet for the sensor. Do not attempt to open or repair

the sensor. Leaking or exhausted sensors should be disposed of in accordance with local

regulations. Consult the Material safety Data Sheet supplied with the sensor.

Plug one end of the coiled cable into the telephone jack receptacle on the end of the

sensor. The jack will only fit one way, so if it does not fit, rotate it until it slides in easily.

Plug the other end of the coiled cable into the receptacle located on the right hand side of

the rear panel of the instrument. This jack will only fit one way, so do not force it.

Note : For sterilization procedures on the Oxygen Cell, see Section 3 on Page 15 below.

Caution : Do NOT autoclave the oxygen sensor

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OPERATIONS

1.4 CALIBRATE THE INSTRUMENT

Calibration should be effected at least once per shift, and always prior to the use of the

instrument.

Note: Never expose the sensor to varying temperatures while calibrating (i.e never hold

the sensor in your hand)

Ensure that the instrument is switched on, and that the oxygen sensor is connected to the

instrument via the coiled cable. Expose the sensor tip to pure (100%) free flowing oxygen (a

flow rate of approximately 6 to 8 litres per minute is recommended).

Tip: For best calibration results, use a T-adapter and flow diverter within a flow circuit,

with the flow diverter attached to the sensor, allowing pure dry oxygen to flow past

the sensor assembly.

Allow the displayed value to stabilize.

Pull out the Calibration Control Knob and rotate until the displayed value is stable at 100%.

At this point, push the Calibration Control Knob back into its locked position.

Turn off oxygen supply and place sensor in ambient air. Remove the flow diverter from the

Sensor, if one was used during the calibration process, Observe that the displayed value

falls to 21% (±2%). Calibration has been successful.

In the event that the displayed value does not reflect 21% (±2%), initiate a re-calibration

(following the steps outlined above).

In the event that calibration is once more unsuccessful, check that the purity of the

calibration gas being used is valid. If the quality of the oxygen being used in the calibration

process is acceptable, and calibration is still impossible, replace the oxygen sensing cell.

Note: The calibration process should always be executed in dry, non-humidified

oxygen. Water vapour dilutes the oxygen concentration which can produce

errors in the calibration. The accuracy of the instrument is only as good as the

quality of the calibration process.

Note: It is not uncommon for the ambient air in hospital wards to be as high as 23%.

If the unit fails the 21% calibration reading move the instrument to a location

where oxygen contamination is unlikely.

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OPERATIONS

1.5 NORMAL OPERATION

Switch the instrument on using the On–Off Switch.

Validate the calibration of the instrument by exposing the oxygen sensor to room air, and

verifying that the display on the instrument reads 100% (± 2 %). A further check can be

carried out by exposing the sensor to a stream of 21% oxygen, and verifying that the display

on the instrument reads 100% (± 2 %).

Should this validation procedure indicate that the instrument is out of calibration, follow the

calibration procedures set out in 1.4 above.

Once the calibration of the instrument has been verified, place the sensor tip within the

stream of gas (e.g. breathing circuits) or the localised environment (e.g. incubators or

oxygen tents) that requires to be monitored.

It is highly recommended that a flow diverter be used when monitoring a dynamic gas

stream. This will prevent sample stagnation, and create a vortex effect that will facilitate a

more accurate continuous assessment of the gas stream being monitored. The flow

diverter should be plugged into a T-adapter, which must be located in line.

Note: Check the breathing circuit for leaks. Ensure that the circuit downstream of the

sensor does not produce any back-pressure or restrictions of the gas flow, or

errors in the readings will result.

When using the instrument in a static environment, such as in an incubator, the flow diverter

should be removed so that it does not interfere with the rapid exchange of gases through

the gas permeable membrane of the sensor cell. When it is necessary to thread the cable

through a small hole in order to gain access to the inside of the chamber, the instrument

should be switched off, the cable should be disconnected at the sensor, threaded through

the hole, and reconnected inside the chamber (see1.3 above), before commencing as

described above.

Note: Failure to remove the flow diverter will result in the marked slowing of the

sensor response time.

The instrument will display the measured oxygen concentration. The high and low alarms

should be set as detailed in 1.6 below.

When using the instrument in the presence of anaesthetic agents, it is possible for the

measured value to reflect a fall. The magnitude of this fall is related to the level of oxygen

concentration and the duration of the exposure to the anaesthetic agent. See 1.7 below for

further details.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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OPERATIONS

1.6 SET THE ALARMS

The lines indicating the 100% graduations around the High and Low Alarm Settings Knobs

are only intended as guides, and not as precise settings.

Once the desired oxygen concentration has been set, bring the high alarm setting down, by

turning the High Alarm Setting Knob anti-clockwise, until the alarm is triggered, and then

take the high alarm setting up by approximately 5%. Bring the low alarm setting up, by

turning the Low Alarm Setting Knob clockwise, until the alarm is triggered, then take the

setting down by approximately 5%. These settings will create a “window” of approximately

10%, within which the set oxygen concentration will now be measured. This window can be

increased or decreased, according to the users requirements. Any deviation from this set

window will trigger the alarm.

The graph alarm is accurate at 100% and within ±8% at 21%, and the low alarm is most

accurate at 21%, and within ±8% at 100%. This is depicted in the graph below.

The instrument will alarm at any oxygen concentration below 18%.

In the event of a violation of the pre-set alarm limits, the instrument will provide both an

audible and a visual alarm signal. Under these conditions, it is possible to “mute” or

temporarily silence the audible alarm tone for about 60 seconds to allow corrective action to

be taken. If the condition is not rectified within this time, then the audible alarm tone will be

automatically reinstated. Audible alarm signals are tonally matched to the type of threshold

violations i.e. low alarm violations are signalled via a lower pitched audible signal, while

high alarm violations are signalled via a higher pitched audible signal.

Oxygen Monitor

Alarm Setting Tolerances

20

40

60

80

100

20 40 60 80 100

Oxygen Concentration Reading

Alarm Setting

Alarm Point

Low Alarm

High A larm

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Analytical Instruments

SECTION TWO ANAESTHETIC AGENTS

2. ANAESTHETIC AGENTS

The anaesthetic agents listed in the following table (Halothane, Enflurane, Isoflurane Sevoflurane,

and Desflurane) were vaporised into a stream of 30%oxygen / 70% nitrous oxide. The resultant

drops in displayed oxygen concentration after a 2 hour exposure period were observed.

Exposurers in excess of 2 hours will provide marginally greater errors. The errors listed are typical

for all gas permeable membrane oxygen sensors.

Exposure of the sensor to gas, free from any anaesthetic contamination, for a period of equal or

greater than the exposure period, will eliminate the measurement error in most instances.

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 O20%

Nitrous Oxide 80%, balance O20%

Carbon Dioxide 10%, balance O20%

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 TED 191 Portable Oxygen Monitor should not be used in the presence of

flammable anaesthetics such as diethal ether or cyclpropane.

The T-7 oxygen 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 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 specific guidelines as

given in the Material Safety Data Sheet of the sensor.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION THREE CLEANING AND STERILISATION

3.1 CLEANING THE TED 191 PORTABLE OXYGEN MONITOR

The instrument itself should be cleaned using a damp cloth. In the event of an excessive

build-up of dirt, a mild alcohol solution (isopropyl) may be used to wipe over the instrument,

which should be allowed to air-dry afterwards. In extreme cases, the monitor casing may be

cleaned using a mild detergent.

Note: The Accurox Oxygen monitor cannot be liquid sterilised or autoclaved –

irreparable damage may result.

3.2 STERILISING THE T-7 OXYGEN SENSOR AND CONNECTING CABLE

The T-7 oxygen sensors and connecting cables used on the instrument may be gas

sterilised using low temperature ethylene oxide. A vacuum must not be drawn on the

sensor during the sterilisation process.

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SECTION FOUR DO’S AND DON’TS

DO’S

; Read the Operators Manual thoroughly before using the instrument.

; Calibrate once per shift, and prior to each and every use.

; Check the high and low alarm threshold settings prior to use.

; Replace the batteries immediately when required.

; Keep the instrument, cable and sensor dry at all times.

; Re-calibrate after changing the sensor or batteries.

; Visually inspect the whole instrument prior to use.

; Check the integrity of all cable connections routinely.

; Remove and carefully store the “flow diverter” when using the instrument in “static”

environments such as incubators, oxygen hoods etc.

; Perform an alarm functionality test prior to each use.

; Remove batteries if the instrument is not to be used for a month plus

DON’TS

: Use the Accurox Oxygen Monitor if you suspect any malfunction.

: Use the monitor in the presence of flammable anaesthetics.

: Autoclave the instrument and/or the sensor.

: Submerge the instrument and/or sensor in water or any other liquid.

: Expose instrument to other equipment with high levels of RFI emission.

: Place the instrument itself in a water vapour saturated environment.

: Expose the LCD to excessive direct sunlight

: Dispose of the sensor cell in fire, or place in an incinerator.

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SECTION FIVE ROUTINE MAINTENANCE

5.1 ROUTINE VISUAL INSPECTION

Always inspect the instrument prior to use for obvious damage or for parts or components

missing. Make a point of checking the oxygen sensor cell for signs of electrolyte leakage,

water condensation on the sensing surface. Also check the integrity of the cable and all

cable connections.

5.2 CHANGING BATTERIES

From time to time the 4 x AA (penlight) dry cell batteries that power the instrument will

require replacement. This requirement will be indicated via a "LO BAT" alarm message

located in the top left hand corner of the LCD display. It is also possible, if the instrument

has not been used for sometime, that the batteries will be depleted to the extent that the

instrument will not power up when switched on. In both instances, the batteries must be

replaced.

To change the batteries, follow the procedures set out in 1.2 above.

Initiate a calibration once the new batteries are installed prior to using the instrument.

5.3 CHANGING THE OXYGEN SENSOR CELL

From time-to-time the oxygen sensor cell, being a consumptive electro-chemical device, will

require replacement. This requirement will be indicated via an inability to achieve calibration

i.e the range provided by the Calibration Control Knob will not be sufficient to achieve the

setting of 100% on the LCD display when exposing the sensor tip to 100% pure oxygen.

To change the oxygen sensor, follow the procedures set out in 1.3 above.

Initiate a calibration once the new sensor has been installed prior to using the instrument.

A Sensor Cell Replacement Log has been provided for the reference of the users, and is

located at the back of this Instruction Manual. The details of the replacement sensor should

be entered into this log at the time of changing.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION SIX TROUBLESHOOTING

SYMPTOM CURE / REMARK

No numeric display on

the LCD when powered

on

1) Check battery drawer is properly located.

2) Check battery polarity .

3) Check batteries for replacement

4) External power : check polarity and voltage of supply;

: check if functional on batteries.

Inability to achieve

calibration

1) Check calibration process (as described in section 1.4).

2) Check flow rate of calibrating gas (6 – 8 lpm)

3) Check sensor cell connection.

4) Check sensor cable connection.

5) Check quality of calibration gas.

6) Check that the calibration gas is dry (not humidified).

7) Wait for 1 or 2 minutes, then attempt a re-calibration.

8) Check sensor cell for damage or electrolyte leaks.

9) Return monitor to authorized service agent for repair.

Constant non-mutable

alarm condition

1) Check high and low alarm settings for possible “crossed” settings

i.e. high threshold value is set lower than low threshold value.

Drift is displayed

readings whilst

calibrating or

immediately thereafter

1) Do not hold the sensor whilst calibrating, as the warmth from your

hand may cause the ambient temperature compensation circuit to

activate, resulting in unstable displayed values.

2) Try calibrating a known “good” sensor.

3) Repeat calibration.

4) Replace the sensor cell.

There is no reaction to

changes in oxygen

concentration

1) Remove the sensor tip from the T-adaptor, unscrew the “flow

diverter” and gently swab any excess moisture off the sensor cell

membrane, then flow dry gas over the membrane.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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TROUBLESHOOTING

SYMPTOM CURE / REMARK

The displayed readings

are unstable

1) Remove the sensor tip from the T-adaptor, unscrew the “flow

diverter” and gently swab any excess moisture off the sensor cell

membrane, then flow dry gas over the membrane.

2) Check for a source of RFI emission. Relocate the instrument.

3) Check that the calibration control knob is properly locked in

position.

Instrument reads “00”

1) The sensor is not plugged in.

2) There is bad sensor/cable or cable/monitor connection.

Displayed value drifts

by 2 – 3% over 3 – 4

hours

1) Replace sensor cable.

2) Replace cable.

Alarm continuously

activates when

displayed value is less

than 18%

1) The minimum low alarm threshold is 18%. The Teledyne TED 191

will always alarm under these conditions.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION SEVEN TECHNICAL SPECIFICATIONS

SAFETY

CLASSIFICATION

Complies to IEC 601 – Safety of Medical Equipment Internally

powered equipment

Drip proof – IPX 1

Not suitable for used with flammable anaesthetic mixture

POWER Internal : DC 6V, 4 dry cell batteries – size AA/penlight

MASS 525 grams (with T-7 oxygen sensor)

DIMENSIONS 59mm (H) x 152mm (W) x 115mm (D)

BATTERY DURATION

Approximately 900 hours of continuous non-alarming operation

Low battery status indication is provided

Replace batteries within 48 hours of low battery indication

ALARMS

High oxygen concentration (18% to 102%)

Low oxygen concentration (18% to 100%)

Low battery (visual alarm only)

Most alarm conditions are signalled audibly and visually, with a 60

second audible alarm mute facility provided

MEASUREMENT RANGE 0 to 100% of localised environmental oxygen concentration

DISPLAY TYPE Liquid Crystal Display (LCD)

SENSOR TYPE Class T-7 (Galvanic)

ACCURACY Approximately 2% linear

SENSOR LIFE Approximately 12 months in most applications

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TELEDYNE ELECTRONIC TECHNOLOGIES

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TECHNICAL SPECIFICATIONS

SENSOR RESPONSE

TIME

Less than 6 seconds to 90% of final measured value in response to

a step change in the actual oxygen concentration being measured.

SERVICE

Technical manual will be supplied on request to user’s appropriately

qualified personnel for repair of components designated as

repairable by the manufacturer.

No parts (other than the sensor cell, and dry cell batteries)

deteriorate during normal use.

STORAGE AND

TRANSPORT

Can be stored and transported between -30°C and +50°C

Can be stored and transported at up to 75% relative humidity (non-

condensing)

GENERAL

Operation of instrument is unaffected by :

Humidity (water vapour saturated gas);

Pressure (up to 100cm H2O);

Nitrous oxide (N2O), Halothane, Enflurane or any other

anaesthetic gas or vaporised agent.

Multiple mounting bracket configurations to suit any mounting

requirement. (Custom engineered solutions available on request).

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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION EIGHT EFFECT OF PRESSURE

Virtually all gas sensors and analysers 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 calibration and use. This is why it is

important to calibrate the TED 191 Portable Oxygen Monitor at regular intervals.

It is recommended that the instrument 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). 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 water pressure pulse will produce a .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 unpressurised 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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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION NINE EFFECT OF

HUMIDITY

Humidity does not directly affect the accuracy of the sensor's measurement. However, when a

nebuliser 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 TED 191 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 will block the diffusion

of oxygen to the sensor, rendering it inoperative. It is recommended that the sensor be installed on

the dry side of the breathing circuit at all times.

Water condensate on the exposed cable contacts at the rear of the sensor may affect the oxygen

reading and should be removed by shaking out the condensed water and allowing the sensor to

air dry.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION TEN E

FFECT OF

TEMPERATURE

The Teledyne Electronic Technologies Analytical Intruments sensors adjust for ambient temperature

changes in the range of 0 - 40ºC (32 - 106ºF). 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 applications where the entire sensor

assembly is placed in the gas mixture to be analysed (e.g incubators). No adjustments should be

made during this period (about 1 to 2 hours), since this error will be eliminated when both the

thermistor and sensing electrode have had sufficient time to come to thermal equilibrium.

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TELEDYNE ELECTRONIC TECHNOLOGIES

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SECTION ELEVEN D

ISCREPANCY IN

READINGS

The TED 191 is intended to be used as a secondary oxygen monitor, meaning that it is intended

to verify the accuracy of and check the oxygen concentration leaving another oxygen mixing

device or primary life support system (i.e a blender or anaesthesia machine). Whenever there is a

significant difference in the oxygen readings between the primary and secondary monitors, the

discrepancy must be resolved immediately. The information obtained from the TED 191 should

never be used to make adjustments to the primary life-support system, but should only be used as

an indication that the primary device may require service and/or calibration.

The "LO BAT" message immediately tells you if the batteries need replacing. The TED 191 should

momentarily be removed from the application area and the batteries replaced. If the TED 191 can

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

readings to specification. If after re-installing the TED 191, 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.

If it is found that replacing the sensor and/or batteries does not give proper calibration results, the

troubleshooting section of this manual should be consulted.

26

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

SECTION TWELVE REPAIR

SERVICE

In the event that your TED 191 Portable Oxygen Monitor requires service, the following steps will

help to ensure that the repair request is processed promptly :

Contact your authorised Teledyne Electronic Technologies Analytical Instruments distributor

or factory for return instructions. Do not ship your monitor without first obtaining authorisation.

Include a copy of the sales invoice or other proof of purchase date. Warranty service may be

denied if no proof of purchase is included.

It is your responsibility to pay shipping charges to Teledyne Analytical Instruments. If the unit is

under warranty, the serviced or replaced monitor will be returned to you postage prepaid.

Monitors and sensors damaged by accident or misuse are not covered by the warranty. In

these cases, service charges will be based on time and materials.

27

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

SENSOR CELL

REPLACEMENT LOG

DATE WARRANTY?S

ERIAL NUMBER REMARKS

N/A MANUFACTURED

28

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

TECHNICAL SERVICE LOG

DATE WARRANTY?D

ETAILS REMARKS

29

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

GENERAL NOTES

30

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

SPARE PARTS

LIST

SPARE PARTS

PART NUMBER DESCRIPTION

A51327 Micro-Fuel Cell T-7 with flow diverter P/N A50057

C885 Cable assembly

A268 Tee adapter (22mm)

OPTIONAL ACCESSORIES

PART NUMBER DESCRIPTION

B34102 Mounting Clamp

C53790 Calibration Assembly

A284 Universal adapter set for paediatric circuits (15mm)

A274 Tee adapter, autoclaveable

A283 Tee adapter, metal

A minimum charge of US$20.00 is applicable to spare parts orders.

Important : Orders for spare parts should include the model number, serial number,

and range of the analyzer for which the parts are intended.

Orders should be sent to :

Teledyne Electronic Technologies

Analytical Instruments

16830 Chestnut Street

City of Industry, CA 91749-1580

Phone : (626) 934-1500

Fax : (626) 961-2538

TWX : (910) 584-1887 TDYANLY COID

Web: www.teledyne-ai.com

or your local representative