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Teledyne MX300-I User's Manual

1. OPERATING amp SERVICE INSTRUCTIONS FOR MX300 1 PORTABLE OXYGEN MONITOR P N M75707 REV 1 ECO 04 0088 EQUIPMENT Equipment providing a particular degree of protection against electric shock particularly regarding Allowable LEAKAGE CURRENT Reliability of the protective earth connection if present 4 Teledyne Analytical Instruments i MX300 I Copyright O 2002 Teledyne Analytical Instruments All Rights Reserved No part of this manual may be reproduced transmitted transcribed stored in a retrieval system or translated into any other language or computer language in whole or in part in any form or by any means whether it be electronic mechanical optical manual or otherwise without prior written consent of Teledyne Instruments Analytical Instruments 16830 Chestnut Street City of Industry CA 91749 1580 FCC Statement This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer s instruction manual may cause interference to radio and TV communications It has been type tested and certified to comply with the limits for a Class A and exceeds limits for a Class B computing device pursuant to Subpart J of FCC Rules which are designed to provide reasonable protection against such interference when installed in a commercial and residential environment Operation of this equipment in a residential area may ca
2. 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 Teledyne Analytical Instruments 23 MX300 I Output Jack 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 4 Teledyne Analytical Instruments 24 Portable Oxygen Monitor Operation 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 se
3. be incorrect the changes in the on exhaust side of sensor If partial pressure of the reading changes with 2 flow the sensor is pressurized or there may be a leak in the system B If a high degree of accuracy is desired or the concentration of O2 is in excess of 40 calibration with 100 is recommended C If humidified gas is used to 4 Teledyne Analytical Instruments 38 Portable Oxygen Monitor Service Manual Symptom Why What To Do ventilate the patient water vapor actually dilutes the gas See Appendix Humidity Temperature If a blender is used check its calibration See Appendix Discrepancy in Readings The unit has stopped working and the LCD is displaying alphanumeric figures Alarm sounds flashes continuously The MX300 I instruments are equipped with an electronic watch dog which monitors the circuitry within the unit for potential faults and renders the unit inoperable until the condition is corrected See Watch dog section below Several conditions can activate the watch dog Dropping the unit poor battery connections and radio frequency interference are the most common causes See the watch dog section for additional information A Readings are outside alarm limits gt 9 Disconnect the batteries and inspect the contacts for corrosion Reconnect the batteries If the unit functions properly calibrate the unit and reset the alarm valu
4. 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 RI7MED 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 RI7MED oxygen sensor adjusts for ambient temperature changes in the range of 0 40 C 32 106 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 track
5. class RI7MED 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 1 VDC Note Contact the factory for retrofitting an existing instrument for 3 digit LCD display For RS 232 reconfiguration see 4 Teledyne Analytical Instruments 11 Introduction MX300 I Duae AT AE C 11 H n Ju Section 2 1 5 In addition to the above instrument configuration options the following optional equipment is available for your instrument e Universal Pole Mounting Clamp P N CP 2343 e V Mount Pole Clamp P N CP 2344 e V Mount Wall Adapter P N B 647 e 0 1 VDC Interface Cable P NB 75554 e 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 e Anesthesia e Respiratory Therapy e Neonatal Care 1 5 Theory of Operation The MX300 I monitor can be
6. 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 Anesthesia and Respiratory Care Alarm Signals Part 1 ISO 9703 2 Anesthesia and Respiratory Care Alarm Signals Part 2 EN IEC 60601 1 2 Medical Electrical Equipment Part 1 General Requirements for Safety Electromagnetic Compatibility Requirements and Test MIL STD 810E Environmental Test Methods EN IEC 60601 1 Medical Electrical Equipment General Requirements for Safety 4 Teledyne Analytical Instruments 10 Portable Oxygen Monitor Introduction 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
7. divided into two major functional groups e 7 Oxygen Sensor e 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 TheV SENSOR indicator 4 Teledyne Analytical Instruments 12 Portable Oxygen Monitor Introduction 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 nece
8. end of the battery in the end of the holder marked Do this for each battery Figure 2 6 Installing Batteries 4 Teledyne Analytical Instruments 19 Operation 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 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 po
9. 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 H5O The reading will rise proportionally less for smaller pressures 3 7 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 4 Teledyne Analytical Instruments 36 Portable Oxygen Monitor Service Manual investigation should be made until the discrepancy in readi
10. 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 Teledyne Analytical Instruments 33 Service Manual MX300 I 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 fo
11. or sensor in any liquid e Pass hot or cold gas mixtures over the sensor e Adjust the reading in air after 100 calibration e Expose the unit to devices that produce high levels of radio short wave microwave x ray or high frequency interference Teledyne Analytical Instruments 31 Operation MX300 I e Use cleaning agents or liquids in the cable receptacles or around the battery compartment e Place the unit itself in a water vapor saturated environment e Expose the LCD to excessive sunlight e Expose the unit to a condensing water environment such as a mist tent 4 Teledyne Analytical Instruments 32 Portable Oxygen Monitor Service Manual 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
12. symbols are found in the manual and on the instrument The definition of these symbols is described below specific danger These caution symbols warn of specific procedures which if not followed could cause bodily Injury and or damage the instrument CAUTION Refer to the instructions for details on the 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 4 Teledyne Analytical Instruments iv Portable Oxygen Monitor Table of Contents Safety Messaqgs List OF FIQUICS voi rrr rre rni ire ce e eec List of Listof Tables M Introductio oe eame eem exe 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 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 Insta
13. the calibration is complete the LCD will display the gas value Press the LOCK UNLOCK key to save the calibration data Note The can only be calibrated using 100 oxygen or room air 20 996 Improper calibration or use of other gas concentrations will activate the v 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 20 995 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 4 Teledyne Analytical Instruments 21 Operation MX300 I Note CAUTION should never be used where a high degree of accuracy is needed Never calibrate the unit in humidified gas as water vapor makes the oxygen concentration appear lower than it really is See Appendix Humidity DO NOT ADJUST THE CALIBRATION SETTING
14. 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 e Chapter 1 An introduction to the monitor and its components features and applications e Chapter 2 Step by step set up procedures and information e Chapter 3 A guide for daily operational maintenance and troubleshooting e 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 and 2 These chapters acquaint the user with the instruments use and operation before placing it into operation 4 Teledyne Analytical Instruments iii 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
15. 0 12 37 concentration alarms 10 confined volumes 25 copyright 11 current output See output diffusion sampling 17 digital output 24 dilution effects 26 35 display 9 diverter 13 17 25 30 drift 27 35 electrolyte 13 error 28 29 error code 40 features 11 front panel 9 front panel MX300 I 9 galvanic cell 13 HI alarm 43 defeating 22 humidity 26 35 intended use warning iv interface 9 jumper 24 linear 10 23 LO alarm 43 LOCK UNLOCK button 15 maintenance 33 moisture 26 35 mounting bracket 15 nebulizer 26 35 nitrous oxide 29 optional accessories See accessories output 12 output port 24 oxygen sensor 12 partial pressure 27 36 power 15 power requirements 10 43 17 10 12 25 29 34 RAM 14 reading discrepancy 27 36 reading error 27 28 35 rear panel 18 reconfiguring output 24 resetting alarms 10 response 43 restriction on selling See sale restriction safety information iv sale restriction 11 sensor 10 12 sensor cable 43 sensor failure alarm 10 sensor life 43 sensor maintenance 34 4 Teledyne Analytical Instruments 47 Index sensor mounting 17 set up 15 setpoints See alarm setpoints signal output 23 signal processing 13 signal processor 12 spare parts listing 44 specifications 43 stand 15 standards 10 storage 34 tables listing tee adapter 25 MX300 I Teledyne address 42 45 temperature 26 35 t
16. 000 hr continuous use in non alarm condition 3 AA alkaline batteries Class 17 36 months in air 10 months when continuously exposed to 100 oxygen 2 5 W x 1 25 D x 4 5 H 66 mm x 33 mm x 111 5 mm Retracted 2 ft Extended 10 ft Storage Temp 10 30 C continuous 5 50 C Intermittent Operating Temp 0 40 C Alarm ranges Alarm accuracy 4 Teledyne Analytical Instruments HI alarm 19 to 100 Percent LO alarm 18 to 99 Alarm thresholds are digitally stored and alarm affectivity is digitally compared against the value calculated by the microprocessor Hence the accuracy of the alarms is the same as the accuracy of the unit as specified above 43 Appendix MX300 I A 2 Spare Parts List QTY PART NO DESCRIPTION 1 C43690 RI7MED Micro Fuel Cell 17 with flow diverter P N A50057 3 B99 AA size alkaline battery 1 B69934 Cable assembly 1 268 Tee adapter 22 mm 1 74543 Front panel assembly 1 D 74459 Back panel 1 74461 Battery door 1 B 74462 Battery door lock 1 74463 Mounting clip 1 B 74466 Base assembly A 3 Optional Accessories 1 50057 17 flow diverter 1 2345 Universal Pole Mounting Clamp 1 2344 mount Pole Clamp 1 647 mount Wall Adapter 1 51589 Sensor adapter cap female 22 mm 1 51588 Sensor adapter cap male 22 mm 1 C53790 Calibration assembly 1 284 Universal adapter set for pediatric cir
17. ECESSARY Teledyne Analytical Instruments 29 Operation MX300 I 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 RI7MED 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 radiatio
18. S 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 Note Note To set the HI alarm Press the 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 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 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 The MX300 I Portable Oxygen Monitor is 4 Teledyne Analytical Instruments 5 eS Let 5 4 d gt SS Figure 2 6 Setting the Alarms 22 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 t
19. arm Test Calibration Lock Unlock Silence 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 Teledyne Analytical Instruments 9 Introduction 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 RI7MED 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
20. ass 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 4 Teledyne Analytical Instruments vii MX300 I List of Tables Table 2 1 Oxygen Reading Error in a Mixture of Anesthetic Gas 29 Table 3 1 Troubleshooting c cccseecccecceecsssss 37 Table 3 2 Error COGG8S ux iau DR Denn RES 40 4 Teledyne Analytical Instruments viii Portable Oxygen Monitor Introduction Introduction eee 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 LCD Battery ALARM OFF v SJ NSOR Alarm Status Alarm Setpoint Up Down pA c Alarm Setpoint Low Alarm v High Alarm Set Set Battery Test De Al
21. cuits 15mm 1 A274 Tee adapter autoclavable 1 A283 Tee adapter metal 1 75554 0 1 VDC Interface Cable 1 75555 RS 232 Interface Cable Schematics are available on request A minimum charge is applicable to spare parts orders 4 Teledyne Analytical Instruments 44 Portable Oxygen Monitor Appendix Note Orders for replacement parts should include the part number if available and the model and serial number of the instrument for which the parts are intended Orders should be sent to TELEDYNE Analytical Instruments 16830 Chestnut Street City of Industry CA 91749 1580 Phone 626 934 1500 Fax 626 961 2538 Web www teledyne ai com or your local representative 4 Teledyne Analytical Instruments 45 Appendix MX300 I BLANK 4 Teledyne Analytical Instruments 46 Portable Oxygen Monitor Index Index ar accessories 44 accuracy 43 address 42 45 alarm setpoints 22 alarm setpoints 22 alarm setpoints 10 14 alarm settings crossover of 23 ALARM SILENCE button 10 14 15 ALARM TEST button 23 31 amplification 13 analog output 23 analysis range 10 43 anesthetic gas 28 anode 13 audio alarm 14 BATT TEST button 15 20 batteries 10 19 battery compartment 19 battery installation 19 battery status indicator 10 battery test 34 breathing circuits 25 cable 16 calibration 20 21 34 calibration interval 27 36 cathode 13 CHECK SENSOR button 1
22. e watchdog detects a failure one of the following codes will appear on the LCD The error codes can appear on the LCD when batteries are first installed during normal operation or if the unit is subjected to extreme shock In some cases an additional digit is used in the error code to supply additional information For example the error code 6 and 7 are followed by another digit listed as N in Table 3 2 The error code 65 would indicate that a key is stuck and this key is the Silence key In addition to supplying visual error codes the audio device will beep a number of times to indicate the general error in case the display is not functional NOTE To reset the watchdog error code Remove one battery for 5 seconds and replace If the error persists contact your local representative or Teledyne for assistance Table 3 2 Error Codes Error Code Audio Beeps Error Indeterminate 2 The watchdog timer has timed out indicating a serious software error 30 3 Analog output is different from the expected value May indicate a shorted or over loaded analog output or a failure of the analog to digital converter or digital to analog converter circuit 4 Teledyne Analytical Instruments 40 Portable Oxygen Monitor Service Manual 50 5 The ADC circuit failed during POST 6 5 6 There is no indication of which key is stuck A stuck key has been detected The second digit example 5 on the displa
23. emperature tracking 27 35 thermal equilibrium 27 36 thermal tracking error 27 35 thermistor 26 35 troubleshooting 37 type B equipment i ventilator 27 36 warranty 1i watchdog circuit 40 water vapor 22 Website address 42 45 4 Teledyne Analytical Instruments 48
24. es gv Try a new set of batteries Increase the distance between the unit and any source of radio frequency interference The sensor cable is a prime source of pickup as it can act like an antenna Relocate the sensor cable and if possible change its coiled length to de tune its antenna effect Placing the cable in a different position may also help A Adjust high and low alarm setting to be above and below O2 value being displayed No display A Batteries expired B Bad battery connection A Check replace batteries C Calibrate Keys inoperable cannot turn unit off The LOCK UNLOCK key is activated which is preventing key operation B Check battery connections A Press LOCK UNLOCK key once LCD will flash indicating keys are active 4 Teledyne Analytical Instruments 39 Service Manual MX300 I Symptom Why What To Do Cannot adjust Critical settings require A If display is not flashing calibration or alarm two keys be pressed in press lock key once to settings a specific order activate keys Press desired function followed by the Up key is and Down key Note In the event that none of these procedures produce desired results remove the batteries and return the unit to Teledyne for repair 3 9 Watchdog The MX300 I is equipped with a watchdog circuit that continuously monitors the electronics for proper operation If th
25. es a description of certain fault codes which are diagnostic of some common usually electronic problem with the instrument Some of these codes refer to specific components on the PCB that are problematic or have failed These codes are useful in reporting a problem with your instrument to Teledyne Customer Service If an error code is indicated on your monitor record the number and report it to the Customer Service Department at the address below 3 11 Return Authorization for Service For any service beyond sensor and battery replacement the instrument must be returned to the factory A return merchandise authorization RMA number must be obtained from Teledyne Analytical Instruments prior to returning an instrument for service You can request a RMA number via email by contacting us at tetci_customerservice teledyne com You can also contact us at the address below Customer Service Department TELEDYNE Analytical Instruments 16830 Chestnut Street City of Industry CA 91749 1580 USA Phone 626 934 1500 Fax 626 961 2538 Or via the web at www teledyne ai com 4 Teledyne Analytical Instruments 42 Portable Oxygen Monitor Appendix Appendix A 1 Specifications Range Accuracy Response Time Battery Life System Power Sensor Type Expected Life Dimensions Sensor Cable 0 100 oxygen 2 of full scale at constant temperature and pressure 90 in less than 8 seconds at 25 C Approximately 2
26. he 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 275 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
27. he 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 17 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 22 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 RI7MED will block the diffusion of
28. ing 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 Teledyne Analytical Instruments 35 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 1s the total pressure that is increasing Producing a corresponding increase in the partial pressure of oxygen A
29. ints will also need to be reset after calibration is completed Note For first time and for routine maintenance 73 calibrations make sure the sensor and sensor cable are installed correctly before attempting to calibrate the instrument 57 S To calibrate the instrument See Figure 2 7 4 1 Turn the unit on by pressing the ON OFF I O key Figure 2 7 Calibration Sequence 2 Check the batteries by pressing the BAT key 3 Ifthe LCD is not flashing press the LOCK UNLOCK key to unlock the keys LCD will flash indicating changes can be 4 Teledyne Analytical Instruments 20 Portable Oxygen Monitor Operation 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
30. llation 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 4 Teledyne Analytical Instruments Service Manual Appendix 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 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 A 1 Specifications A 2 Spare Parts List A 3 Optional Accessories 4 Teledyne Analytical Instruments MX300 I 26 27 27 28 28 28 29 30 30 33 33 33 33 34 34 35 35 35 35 36 36 37 40 41 42 43 43 44 44 vi Portable Oxygen Monitor List of Figures oo 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 Br
31. n sterilization 2 4 Do s and Don ts _po e Read all of the directions before using for the first time e Calibrate every 8 hours or before every use e Visually inspect the sensor for leakage before each use e Calibrate using 100 oxygen and check in air e Check the HI and LO alarm settings prior to each use 4 Teledyne Analytical Instruments 30 Portable Oxygen Monitor Operation e Test batteries regularly and replace when battery indicator shows low battery no bars remaining e Make sure keys are locked by using the LOCK UNLOCK key feature e Keep the unit sensor and connections dry or on the dry side of the breathing circuit e Recalibrate after replacing the batteries e Recalibrate after replacing the sensor e Use properly installed alkaline batteries only e Make sure the RI7MED sensor is properly attached e Remove the plastic flow diverter only when using the tee adapter e Remove and save the plastic flow diverter when using the sensor in non flowing applications incubators tents etc e Perform an alarm test before each use press the ALARM TEST key e Clean the case with isopropyl alcohol or mild detergent only DON T e Use this monitor if you suspect any malfunction e Use the instrument in the presence of flammable gases e Use anything but alkaline batteries e Autoclave or freeze the sensor or instrument e Open or try to repair a leaking or broken sensor e Immerse the unit
32. ngs is resolved The troubleshooting section of this manual may provide additional assistance in locating the problem Note The MSDS on this material is located in the Appendix It is also available upon request through the Teledyne Environmental Health and Safety Coordinator Contact at 626 934 1592 3 8 Troubleshooting The MX300 I oxygen monitor provides a variety of built in safety features that prevents its use when a fault is detected When a unit displays the message SENSOR and sounds the audible and visual alarm continuously it is an indication of a faulty connection between the sensor and the unit or an expired or faulty sensor To determine where the difficulty lies refer to the following guidelines in Table 3 1 Table 3 1 Troubleshooting Symptom Why What To Do New sensor responds If the sensor is new A Wait 1 2 hours and slow or drifts and was just recalibrate removed from its sealed bag it may need to run for several hours Sensor will not read Calibration in 100 A Recalibrate using dry gas below 22 after calibration in 100 O2 was invalid or the room air is contaminated with excess oxygen making sure the reading stabilizes before making any adjustments B Make sure that at least 6 30 cm of tubing is attached to the exhaust side of the tee adapter to prevent back filling O2 flow rate should not exceed 5 l min C Oxygen concentration at the sensor is sig
33. nificantly higher than 2196 Take the instrument to a well ventilated area and check 4 Teledyne Analytical Instruments 37 Service Manual MX300 I Symptom Why What To Do the reading again E Try calibrating with a known good sensor if this fails see symptom Reading drifts over 2 3 The sensor does not Water is condensing A Remove the sensor from tee react to changes in on the sensing adapter and unscrew the oxygen concentration surface plastic flow diverter Using or the readings are absorbent tissue or cotton Nn Electrical interference unstable and drifting is disrupting the swab gently wipe off sensing Ing surface inside threaded electronics portion of sensor assembly B Relocate unit away from sources of electrical noise such as cauterizing equipment and two way radios The display is flashing The unit has detected A Check sensor cable a fault in the signal connections and make sure Y SENSOR from the sensor they are completely Sensor has expired inserted into the mating connector and the capture The sensor has been nut is firmly in place D Mc B Expose the sensor in 10096 g orpo O2 and check calibration oxygen C The sensor output has fallen to a level where it is no longer usable Replace sensor The oxygen reading Like all O2 sensors A During calibration make fluctuates or appears to the R17MED detects sure there is no restrictions
34. ntly 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 Brass Insert Figure 2 5 Brass Insert for Universal Mounting Clamp 4 Teledyne Analytical Instruments 18 Portable Oxygen Monitor Operation 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
35. nto the receptacle located on the right side of the unit and secure it in place using the capture nut See Figure 2 2 4 Teledyne Analytical Instruments 16 Portable Oxygen Monitor Operation Capture Nut Monitor P Sensor Connection 4 Connection Figure 2 2 Sensor Cable Connection to Monitor Note When the MX300 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 Cell u Flow i Diverter Sensing LA Tee Surface Ns _ Adapter Figure 2 3 Mounting the Sensor in the Tee Adapter gt Teledyne Analytical Instruments 17 Operation 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 ge
36. oncentration 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 27 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 22 can also be used to interrupt the sensor disconnects audible alarm 4 Teledyne Analytical Instruments 14 Portable Oxygen Monitor Operation Operation Note Upon receipt INSPECT THE ENTIRE UNIT FOR DAMAGE Check the unit and all included accessories for broken or loose parts If damaged DO NOT USE Notify the shipper and consult Teledyne Analytical Instruments Note This equipment is internally powered using 3 AA batteries CAUTION THE 00 1 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 Setthe alarms The control keys are designed for easy operation A LOCK UNLOCK key has been supplied to prevent accidental changes to critical setting
37. oxygen to the sensor rendering it inoperative We recommend installing the sensor on the dry side of the breathing circuit at all times 4 Teledyne Analytical Instruments 26 Portable Oxygen Monitor Operation 2 3 2 Temperature The R17MED oxygen sensor adjusts for ambient temperature changes in the range of 0 40 C 32 106 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
38. r 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 ho
39. r 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 RI7MED 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 4 Teledyne Analytical Instruments 34 Portable Oxygen Monitor Service Manual functional at this point After calibration is completed the alarm set points will need to be reset To
40. s This eliminates unwanted changes in calibration or alarm settings from accidental touching or bumping ofthe 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 75 BATT TEST key continue to operate normally when the lock feature is activated Teledyne Analytical Instruments 15 Operation 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 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 RI7MED Sensor 3 Plug the other end of the coiled cable i
41. ssary 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 4 Teledyne Analytical Instruments 13 Introduction 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 c
42. ttings The AX MX300 I instruments can be used to measure gas mixture for oxygen in two basic modes e In the inhalation side of breathing circuit ahead of antibacterial filters humidifiers and medicating devices nconfined 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 4 Teledyne Analytical Instruments 25 Operation MX300 I R17MED sensor so that it does not interfere with the rapid exchange of gases to and from the sensing surface of t
43. urs 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 4 Teledyne Analytical Instruments 28 Portable Oxygen Monitor Operation Table 2 1 Oxygen Reading Error in a Mixture of Anesthetic Gas Gas or Vapor Level Balance Mixture of 30 70 except where noted Gas or Vapor Test Level Oxygen Reading Error Helium 50 balance 0 Nitrous Oxide 80 balance O2 0 Carbon Dioxide 10 balance 0 Halothane 4 lt 1 5 Enflurane 5 lt 1 5 Isoflurane 5 lt 1 5 Sevoflurane 5 lt 1 5 Desflurane 15 lt 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 MX300 I SHOULD NOT BE USED IN THE PRESENCE OF FLAMMABLE ANESTHETICS SUCH AS DIETHYL ETHER OR CYCLOPROPANE CAUTION THE 00 1 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 N
44. 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 RI 7MED 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 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 H20 The reading will rise proportionally less for smaller pressures 4 Teledyne Analytical Instruments 27 Operation 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 1 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 o
45. use interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference Note The above statement is required by the FCC for any device that incorporates microprocessors Warranty Teledyne warrants that the goods are free from defects of material and of construction for a period of 2 years from the date of shipment from Teledyne The Class R 17MED Micro Fuel Cell is warranted for two years from the date of shipment from Teledyne The liability of Teledyne if any shall be limited solely to the replacement and repair of the goods and shall not include shipping costs or other incidental damages as defined in Section 2 715 of the U S Uniform Commercial Code This warranty is null and void if any goods are subjected to misuse negligence accident or repairs other than those performed by Teledyne or an authorized service center CAUTION FEDERAL LAW RESTRICTS THIS DEVICE TO SALE BY OR ON THE ORDER OF A PHYSICIAN 4 Teledyne Analytical Instruments ii 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
46. y shows which key is stuck 0 Low Alarm 1 Batt 2 Cal 3 Up 4 Down 5 Silence 6 High Alarm 7 Alarm Test 8 Key Lock 7 2 7 There is no indication of the type of DAC failure A failure has occurred during the automatic calibration of the digital to analog converter DAC circuit The second digit example 2 shows the type of digital to analog failure 0 Measurement 1 High Test 2 Low Test 3 Offset Cal 4 Gain Cal 3 10 Other Problems with the Instrument Most other problems arise from either mechanical damage from the instrument falling from a bench or table or electronic component failure In these units repair or troubleshooting the PCB or individual component on the board is not feasible It requires specialized test equipment and probes not generally available to the public Under most circumstances a replacement of the entire PC Board is recommended The instrument must be returned to the factory for PCB installation Occasionally depending on the environment of use keys can become stuck or function erratically due to contamination Use a mild 4 Teledyne Analytical Instruments 4 Service Manual MX300 I non abrasive cleaner solution to periodically clean the keypad and screen An aerosol jet spray of the type commonly used to clean computer keyboards can be used to dislodge dirt and accumulations from the keypad The Error Code Table Table 3 2 includ

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