Teledyne Respiratory Product TED 191 User Manual

TED 191  
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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TABLE OF CONTENTS  
SECTION TOPIC  
PAGE NUMBER  
INTRODUCTION  
APPLICATIONS  
4
5
DESCRIPTIONS OF FUNCTIONAL ZONES:  
FRONT PANEL  
REAR PANEL  
6
7
1.  
OPERATIONS:  
1.1  
1.2  
1.3  
1.4  
1.5  
1.6  
SET-UP  
8
9
10  
11  
12  
13  
INSTALL THE BATTERIES  
INSTALL THE SENSOR  
CALIBRATE THE INSTRUMENT  
NORMAL OPERATION  
SET THE ALARMS  
2.  
ANAESTHETIC AGENTS  
CLEANING  
14  
15  
16  
3.  
4.  
DOS AND DONTS  
5.  
ROUTINE MAINTENANCE  
TROUBLESHOOTING  
.
17  
18  
20  
22  
23  
24  
25  
26  
27  
28  
29  
30  
6.  
7.  
TECHNICAL SPECIFICATIONS  
EFFECT OF PRESSURE  
EFFECT OF HUMIDITY  
EFFECT OF TEMPERATURE  
DISCREPANCY IN READING  
REPAIR SERVICE  
8.  
9.  
10.  
11.  
12.  
SENSOR CELL REPLACEMENT LOG  
TECHNICAL SERVICE LOG  
GENERAL NOTES  
SPARE PARTS LIST  
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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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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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DESCRIPTION OF FUNCTIONAL ZONES  
FRONT PANEL  
Calibration Control  
High Alarm Setting Knob  
Alarm Mute Button  
60  
50  
50  
70  
80  
40  
30  
TELEDYNE  
HI  
90  
21  
102  
60  
X
21  
70  
80  
40  
30  
21  
LO  
% OXYGEN  
OXYGEN MONITOR  
90  
I
O
102  
Low Alarm Setting Knob  
Liquid Crystal Display (LCD)  
On / Off Switch  
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  
High Alarm Setting  
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.  
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  
Liquid Crystal Display  
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.  
Displays measured oxygen concentration, low battery condition  
and provides a visual indication of either a high (+) or low (-) alarm  
threshold violation.  
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DESCRIPTION OF FUNCTIONAL ZONES  
REAR PANEL  
Sensor Cable Connector Plug  
Battery Drawer  
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.  
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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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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:  
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.  
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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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.  
Oxygen Monitor  
Alarm Setting Tolerances  
100  
80  
Alarm Point  
60  
Low Alarm  
High Alarm  
40  
20  
20  
40  
60  
80  
100  
Oxygen Concentration Reading  
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.  
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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  
50%, balance O2  
Oxygen Reading Error  
0%  
Helium  
Nitrous Oxide  
Carbon Dioxide  
Halothane  
Enflurane  
Isoflurane  
80%, balance O2  
10%, balance O2  
0%  
0%  
*
4%  
5%  
5%  
5%  
15%  
< -1.5% O2*  
< -1.5% O2*  
< -1.5% O2*  
< -1.5% O2*  
< -1.5% O2  
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 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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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  
DOS AND DONTS  
DOS  
; 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  
DONTS  
: 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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SECTION SIX  
TROUBLESHOOTING  
SYMPTOM  
CURE / REMARK  
1) Check battery drawer is properly located.  
2) Check battery polarity .  
No numeric display on  
the LCD when powered  
on  
3) Check batteries for replacement  
4) External power : check polarity and voltage of supply;  
: check if functional on batteries.  
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.  
Inability to achieve  
calibration  
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.  
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.  
Drift is displayed  
readings whilst  
calibrating or  
2) Try calibrating a known “good” sensor.  
3) Repeat calibration.  
immediately thereafter  
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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TROUBLESHOOTING  
SYMPTOM  
CURE / REMARK  
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.  
The displayed readings  
are unstable  
2) Check for a source of RFI emission. Relocate the instrument.  
3) Check that the calibration control knob is properly locked in  
position.  
1) The sensor is not plugged in.  
Instrument reads “00”  
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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SECTION SEVEN  
TECHNICAL SPECIFICATIONS  
Complies to IEC 601 – Safety of Medical Equipment Internally  
powered equipment  
SAFETY  
CLASSIFICATION  
Drip proof – IPX 1  
Not suitable for used with flammable anaesthetic mixture  
POWER  
Internal : DC 6V, 4 dry cell batteries – size AA/penlight  
525 grams (with T-7 oxygen sensor)  
MASS  
DIMENSIONS  
59mm (H) x 152mm (W) x 115mm (D)  
Approximately 900 hours of continuous non-alarming operation  
Low battery status indication is provided  
BATTERY DURATION  
Replace batteries within 48 hours of low battery indication  
High oxygen concentration (18% to 102%)  
Low oxygen concentration (18% to 100%)  
Low battery (visual alarm only)  
ALARMS  
Most alarm conditions are signalled audibly and visually, with a 60  
second audible alarm mute facility provided  
MEASUREMENT RANGE  
DISPLAY TYPE  
SENSOR TYPE  
ACCURACY  
0 to 100% of localised environmental oxygen concentration  
Liquid Crystal Display (LCD)  
Class T-7 (Galvanic)  
Approximately 2% linear  
SENSOR LIFE  
Approximately 12 months in most applications  
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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.  
Technical manual will be supplied on request to user’s appropriately  
qualified personnel for repair of components designated as  
repairable by the manufacturer.  
SERVICE  
No parts (other than the sensor cell, and dry cell batteries)  
deteriorate during normal use.  
Can be stored and transported between -30°C and +50°C  
STORAGE AND  
TRANSPORT  
Can be stored and transported at up to 75% relative humidity (non-  
condensing)  
Operation of instrument is unaffected by :  
Humidity (water vapour saturated gas);  
Pressure (up to 100cm H2O);  
GENERAL  
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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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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SECTION NINE  
HUMIDITY  
EFFECT OF  
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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SECTION TEN  
TEMPERATURE  
EFFECT OF  
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.  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
24  
 
SECTION ELEVEN  
READINGS  
DISCREPANCY IN  
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.  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
25  
 
SECTION TWELVE  
SERVICE  
REPAIR  
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.  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
26  
 
SENSOR CELL  
REPLACEMENT LOG  
DATE  
WARRANTY?  
SERIAL NUMBER  
REMARKS  
N/A  
MANUFACTURED  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
27  
 
TECHNICAL SERVICE LOG  
DATE  
WARRANTY?  
DETAILS  
REMARKS  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
28  
 
GENERAL NOTES  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
29  
 
SPARE PARTS  
LIST  
SPARE PARTS  
PART NUMBER  
A51327  
C885  
DESCRIPTION  
Micro-Fuel Cell T-7 with flow diverter P/N A50057  
Cable assembly  
A268  
Tee adapter (22mm)  
OPTIONAL ACCESSORIES  
PART NUMBER  
B34102  
C53790  
A284  
A274  
A283  
DESCRIPTION  
Mounting Clamp  
Calibration Assembly  
Universal adapter set for paediatric circuits (15mm)  
Tee adapter, autoclaveable  
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 :  
Fax :  
TWX :  
Web:  
(626) 934-1500  
(626) 961-2538  
(910) 584-1887 TDYANLY COID  
or your local representative  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
30  
 

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