MaxTech MAXO2 OM-25ME User's Manual
Contents
1. and systems Under normal operating conditions Maxtec warrants the Monitor to be free from defects of workmanship or materials for a period of two 2 years from the date of shipment from Maxtec provided that the unit is properly operated and maintained in accordance with Maxtec s operating instructions Based on Maxtec s product evaluation Maxtec s sole obligation under the foregoing warranty is limited to making replacements repairs or issuing credit for equipment found to be defective This warranty extends only to the buyer purchasing the equipment directly from Maxtec or through Maxtec s designated distributors and agents as new equipment Maxtec warrants the MAX 250E oxygen sensor in the MAXO 9 Monitor to be free from defects in material and workmanship for a period of two 2 years from Maxtec s date of shipment MAXO 9 unit Should a sensor fail prematurely the replacement sensor is warranted for the remainder of the original sensor warranty period Routine maintenance items such as batteries are excluded from warranty Maxtec and any other subsidiaries shall not be liable to the purchaser or other persons for incidental or consequential damages or equipment that has been subject to abuse misuse mis application alteration negligence or accident THESE WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOS2. in any way can better serve your needs Please feel free to write FAX or e mail us at the address on the back of this manual c o the Maxtec Marketing Department NOTE In order to obtain optimum performance from your MAXO2 monitor all operation and maintenance must be performed in accordance with this manual Please read the manual thoroughly before using the monitor and do not attempt any repair or procedure that is not described herein Maxtec cannot warrant any damage resulting from misuse unauthorized repair or improper maintenance of the instrument JN WARNING The sensor of the MAXOz Oxygen Monitor MAXO has been tested with various anesthesia gases including Nitrous oxide Halothane Isoflurane Enflurane Sevoflurane and Desflurane and found to have acceptable low interferance the device in its entirety including electronics is not suitable for use in the presense of a flammable anesthetic mixture Only the threaded sensor face flow diverter and T adapter may be allowed to contact such a gas mixture To avoid explosion do not operate the Oxygen monitor in the presence of flammable anesthetics or in an atmosphere of explosive gases Operating the oxygen monitor in flammable or explosive atmospheres may result in fire or explosion Never allow an excess length of cable near the patient s head or neck as such could result in strangulation Secure excess cable to the bed rail or suitable object Never use
3. measuring oxygen on the dry side of the ventilator it will correctly indicate an oxygen concentration slightly greater than actually found in the wet side delivered to the patient The water vapor has diluted the gas stream Additionally gas streams of high humidity may tend to condense on the sensor Condensation on the sensor may eventually affect performance For this reason it is recommended that the sensor be mounted in a vertical position facing downward to prevent condensate from flowing onto the sensing surface 19 9 SPARE PARTS AND ACCESSORIES Part Number R12503 002 R212P91 R103P16 R212P17 R212P10 R212P30 001 Accessories R106P15 R205P86 R206P75 R213P02 R213P31 RP16P02 RP16P10 R213M05 R213M66 Item MAX 250E Sensor Battery Cover Monitor Analyzer External Cable Keypad LCD Display PCBA Board Concentrator Adapter for Sensor Probe Monitor Analyzer Wall Mount Bracket Monitor Analyzer Pole Mount Clamp Monitor Analyzer Protective Carrying Case Swivel Mount Stand T Adapter 15 T Oxygen Sensor Activator System OM 25ME Manual Technical Service Manual Although normal usage will not require repair Maxtec will make available on request diagrams descriptions and instructions to assist user s appropriately qualified technical personnel in repairing and replacing broken or worn components 10 WARRANTY The MAXO 9 Monitor is designed for medical oxygen delivery equipment
4. A known value of oxygen is defined as an oxygen source which has a traceable certificate and or USP certification Note Before beginning calibration the MAX 250E sensor must be in thermal equilibrium You may also need to be aware of other factors which affect device calibration values For more information refer to Factors Influencing Calibration and Performance in this manual 2 2 2 To Calibrate the MAXO 9 Monitor 1 Place the external probe in a stream of gas of known oxygen concentration Expose the sensor to the calibration gas at a regulated pressure and flow 2 Using the ON OFF key make sure the unit is in the power on mode 3 Allow the oxygen reading to stabilize This will normally take about 30 seconds or more 4 Press the LOCK UNLOCK key to unlock the keypad The LOCKED icon will disappear from the display 5 Press the CALIBRATE key on the keypad The word CAL will appear on the display for about 1 second and then the 96 sign will start to flash 6 Use the T and J arrow keys to adjust the displayed oxygen concentration to the level of the known concentration Pressing the arrow keys changes the value in 1 increments If the keys are held down for more than 1 second the display will scroll at a rate of 4 per second Note If 10 seconds elapse between key actuations the system will store the latest calibration value and will revert to normal operation If this occurs inadvertently simp
5. a MAXO monitor with a cable that appears worn cracked or has damaged insulation Before use all individuals who will be using the MAXO must become thoroughly familiar with the information contained in this Operation Manual Strict adherance to the operating instructions is necessary for safe effective product performance This product will perform only as designed if installed and operated in accordance with the manufacturer s operating instructions Use only genuine Maxtec accessories and replacement parts Failure to do so may seriously impair the monitor s performance Repair or alteration of the MAXO beyond the scope of the maintenance instructions or by anyone other than an authorized Maxtec service person could cause the product to fail to perform as designed Calibrate the MAXOz weekly when in operation and if enviromental conditions change significantly ie Temperature Humidity Barometric Pressure Refer to Calibration section of this manual Use of the near devices that generate electrical fields may cause erratic readings If the is ever exposed to liquids from spills or immersion or to any other physical abuse turn the instrument OFF and then ON This will allow the unit to go through its self test and make sure everything is operating correctly Never autoclave immerse or expose the MAXO including sensor to high temperatures gt 70 C Never expose the device to pressure irradia
6. if a monitor is calibrated on a pressurized gas sample containing a known concentration of oxygen and then exposed to ambient air atmospheric pressure the monitor will display a reading less than the actual oxygen percentage To avoid confusion the monitor can be calibrated at a single point on a gas stream similar to the application If for example the purpose of the monitor is to measure oxygen in a concentrator or anesthesia application the optimal results may be attained by calibrating the instrument on a gas of similar concentration and pressure This would typically be done by connecting to a cylinder of a known high concentration of oxygen calibration gas and adjusting the flow and pressure to match the application before calibrating the instrument 8 3 Calibration Errors The MAXO 9 Monitors have a self test feature built into the software to detect faulty calibrations During calibration if the signal from the oxygen sensor is outside the limits stored within the instrument s memory a flashing CAL Er is displayed The error code is displayed to indicate that either the sensor should be replaced or that there is a fault in the calibration process A few simple hints can prevent calibration errors If you try to adjust the monitor display before the reading has stabilized the CAL Er may appear For example if the monitor had just been calibrated on a known high concentration of oxygen source gas and then exposed to ambient a
7. response stability and extra life on the order of 900 000 percent hours The MAX 250E is a galvanic partial pressure sensor that is specific to oxygen It consists of two electrodes a cathode and an anode a teflon membrane and an electrolyte Oxygen diffuses through the teflon membrane and immediately reacts electrochemically at a gold cathode Concurrently oxidation occurs electrochemically at a lead anode generating an electrical current and providing a voltage output Electrodes are immersed in a unique gelled weak acid electrolyte which is responsible for the sensors long life and motion insensitive characteristic Since the sensor is specific to oxygen the current generated is proportional to the amount of oxygen present in the sample gas When no oxygen is present there is no electrochemical reaction and therefore negligible current is produced In this sense the sensor is self zeroing CAUTION The Maxtec MAX 250E oxygen sensor is a sealed device containing a mild acid electrolyte lead Pb and lead acetate Lead and lead acetate are hazardous waste constituents and should be disposed of properly or returned to Maxtec for proper disposal or recovery CAUTION Do not use ethylene oxide for sterilization Do not immerse the sensor in any cleaning solution autoclave or expose the sensor to high temperatures calibration may shift the calibration point enough to require CAUTION Dropping or severely jarring the sens
8. the keypad 3 Press and hold down the CALIBRATE key When the sign starts to flash press the J arrow key to set the calibration value to 20 9 4 Release both the CALIBRATE key and the J key The unit will automatically enter the LOCKED condition and return to normal operation 2 2 4 Factors Influencing Calibration The primary factors influencing the Monitor are temperature pressure and humidity Effects of Temperature The 2 Monitor will hold calibration and read correctly within 3 when in thermal equilibrium within the operating temperature range The device must be thermally stable when calibrated and allowed to thermally stabilize after experiencing temperature changes before reading are accurate For these reasons the following is recommended 1 Allow adequate time for the sensor to equilibrate to a new ambient temperature 2 When used in a breathing circuit place the sensor upstream of the heater 3 For best results perform the calibration procedure at a temperature close to the temperature where analysis will occur Pressure Effect Readings from the Monitor are proportional to the partial pressure of oxygen The partial pressure of Oxygen is equal to the percentage of oxygen 9602 times the absolute pressure AP at which the sample enviroment is measured PO2 96O2 x AP Thus the readings are proportional to the concentration if the pressure is held con
9. E 21 Maxtec Inc 6526 South Cottonwood Street Salt Lake City UT 84107 General Tel 801 266 5300 Toll Free Dial 800 748 5355 FAX 801 270 5590 Home Page http www maxtecinc com email sales maxtecinc com
10. MAXO e MONITOR 2 MODEL OM 25ME OM 25ME L USER S GUIDE m AND OPERATING INSTRUCTIONS R213M05 Rev H manufactured by 0 Manufacturer Inc European Representative Airox S A Parcd activities Pau Pyrenees L echangeur BP833 64008 PAU Cedex France PREFACE This manual describes the function operation and maintenance of the Maxtec Model OM 25ME and OM 25ME L oxygen monitors Notes are included where differences may occur between the two monitors As members of Maxtec s MAXO2 line of oxygen analyzers and monitors the OM 25ME utilizes the Maxtec MAX 250E oxygen sensor and is engineered for fast response maximum reliability and stable performance The OM 25ME is designed primarily for continuous monitoring of oxygen levels delivered by medical oxygen delivery equipment and respiratory care systems Adjustable high and low level alarm setpoints make the OM 25ME ideal for use in neo natal anesthesia and respiratory care THANK YOU Thank you for your purchase of a Maxtec MAXO 9 oxygen monitor We appreciate the time and energy you invest in selecting the equipment best suited to your needs As repayment we are supplying you with a reliable high quality instrument that with proper care and operation will provide you with years of exceptional service We also encourage your comments or suggestions as to how our equipment
11. approximately 20 minutes for the sensor to reach equilibrium 8 Calibrate the new sensor Note If the monitor is on when the sensor is detached and replaced the monitor will automatically force a re calibration The display will read CAL 14 15 PROBLEM SOLVING If the LOW BAT icon is displayed on the LCD readout at any time the batteries should be replaced as quickly as possible When the unit is in the power on mode and the LCD displays 000 the sensor is not connected properly The ATTACH SENSOR icon will also appear on the display Check the sensor connection and if the condition persists contact Maxtec s Customer Service Department If at any time ErX i e Er1 Er4 etc appears on the LCD readout contact Maxtec s Customer Service Department CLEANING AND MAINTENANCE When cleaning or disinfecting the MAXOz Monitor take appropriate care to prevent any solution from entering the instrument The MAXO 9 Monitors surface may be cleaned using a mild detergent and a moist cloth The MAXO 9 Monitor may be disinfected using standard topical disinfectants The MAXO 9 Monitor is not intended for steam ethylene oxide or radiation sterilization Store the MAXO 9 Monitor in a temperature similar to its ambient environment of daily use 7 SPECIFICATIONS 7 1 Base Unit Specifications Measurement Range Resolution Accuracy and Linearity Total Accuracy Response Time Warm up Time Operat
12. example if the low alarm is set at 50 the system will not accept a high alarm setting less than 51 Setting the high alarm to 100 turns off or deactivates the high alarm 4 When the high alarm value is set press the HIGH SET key again to accept the high alarm setting and return to normal operation Note To automatically set the high alarm to 50 without scrolling the display hold the HIGH SET key down and then press the arrow key when the HIGH icon is flashing To automatically turn off the high alarm or set it to 100 hold the HIGH SET key down and then press the T arrow key when the HIGH icon is flashing 3 2 Basic Operation To check the oxygen concentration of a sample gas 1 Place the external probe in the sample gas stream When using a standard T adapter make sure the sensor is mounted in the adapter with the flow diverter pointing downward This will prevent moisture from draining into the sensor membrane Note It is important that a tight fit exists between the probe and the T adapter 2 Initiate flow of the sample gas to the sensor 3 Using the ON OFF key make sure the unit is in the power on mode 4 Allow the oxygen reading to stabilize This will normally take about 30 seconds or more 3 3 Alarm Conditions In the event of either a low alarm or high alarm condition the corresponding LED will begin to flash accompanied by the alarm beeper Pressing the SILENT key will deactivate the buzzer but
13. he T and J arrow keys to set the low alarm to the desired value Pressing the arrow keys changes the value in 1 increments If the keys are held down for more than 1 second the display will scroll at a rate of 4 per second Note If 10 seconds elapse between key actuations the system will store the latest low alarm value and will revert to normal operation If this occurs inadvertently simply repeat the alarm setting procedure The low alarm value cannot be set lower than 18 nor can it be set closer than 1 from the high alarm value due to ASTM specifications special applications requiring alarms below 18 can be accomodated by the model OM 25ME L Monitor For example if the high alarm is set at 25 the system will not accept a low alarm setting greater than 24 4 When the low alarm value is set press the LOW SET or LOCK UNLOCK key again to accept the low alarm setting and return to normal operation Note To automatically set the low alarm to 18 without scrolling the display hold the LOW SET key down and press the J arrow key when the LOW icon is flashing 3 1 2 High Alarm Setting To adjust the high alarm setting 1 Press the LOCK UNLOCK key to unlock the keypad 2 Press the HIGH SET key The HIGH icon will start to flash 3 Use the T and J arrow keys to set the high alarm to the desired value 12 The high alarm value cannot be set closer than 1 from the low alarm value due to ASTM specifications For
14. ing Temperature Storage Temperature Humidity Power Requirements Battery Life Low Battery Indication Sensor Type Expected Sensor Life Alarm System Low Alarm Range High Alarm Range Alarm Accuracy Dimensions Weight Cable Length Diverter Fitting 0 0 100 0 1 1 of full scale at constant temperature R H and pressure when calibrated at full scale 3 Actual Oxygen Level over full operating temperature range 90 of final value in approximately 15 seconds at 23 C none required 15 C 40 C 59 F 104 F 15 C 50 C 5 F 122 F 0 95 non condensing 2 AA Alkaline batteries 2 X 1 5 Volts approximately 3000 hours in typical use LOW BAT icon displayed on LCD Maxtec MAX 250E galvanic fuel cell gt 900 000 Hours over 2 years in typical applications high low alarms flashing red LEDs nominal 2300Hz audible alarm beeper 18 99 gt 1 lower than high alarm 15 99 gt 1 lower than high alarm 19 99 gt 1 higher than low alarm 16 99 gt 1 higher than low alarm exact to displayed alarm value 3 5 W x 5 5 H x 1 5 D 89mm x 140mm x 38mm approximately 92 Ibs 417g 10 ft 8m fully extended fits industry standard 15 mm T adapter OM 25ME L Zz za ra wa OM 25ME L 7 2 Sensor Specifications Type Life Interferent Nitrous Oxide Carbon Dioxide Halothane Enflurane Isoflurane Helium Sevoflurane Desflurane galvanic fuel sensor 0 100 2 yea
15. ir you should wait until the reading has stabilized If you try to adjust the display to read 20 996 before the sample line has cleared of high concentration O2 the sensor may actually be exposed to residual high oxygen The signal from the sensor would still be high and considered out of spec for air thus resulting in a CAL Er The proper procedure is to wait for the reading to stabilize before adjusting the display This may take 30 seconds or more Externally mounted sensors as found on the OM 25ME or OM 25ME L come equipped with diverter tips The tips help direct the gas in a T fitting up to the sensor for analysis The diverter tips should be only used with a flowing gas When calibrating in a non flowing environment remove the diverter tip 8 4 Atmospheres of High Humidity The 2 Monitor can be used in applications where the relative humidity of the sample gas ranges from 0 to 9596 non condensing However it should be noted that water vapor exerts its own pressure in the same manner as oxygen does in a sample gas stream For example if the monitor is calibrated in dry gas and then the gas is humidified the monitor will correctly display a reading which is slightly lower than previously displayed This is due to the dilution of oxygen in the sample gas by water vapor This fact is important to note in systems where there exist both wet and dry gas streams such as in a ventilator circuit If the monitor is
16. is an indication that the unit is in its normal LOCKED state The unit must be unlocked using the LOCK key in order to be calibrated or to change the high and low alarm settings Low Alarm Indicator The low alarm setting is displayed at all times just below the LOW icon on the LCD readout The indicated value represents the oxygen percentage at which the low alarm will be activated In the low alarm set mode the LOW icon will flash at a 1 second rate In a low alarm condition the low alarm value will flash in conjunction with the low alarm light emitting diode LED High Alarm Indicator The high alarm setting is displayed at all times just below the HIGH icon on the LCD readout The indicated value represents the oxygen percentage at which the high alarm will be activated In the high alarm set mode the HIGH icon will flash at a 1 second rate In a high alarm condition the high alarm value will flash in conjunction with the high alarm LED Threaded Mounting Bushing Threads to Table Top Swivel Stand Also may be used with many third party camera mounting accessories Lop P Alarm AH sos maxo me p xtec Keypad External Probe OM 25ME 8 9 Alarm LEDs Low Alarm LED a low alarm condition the red LOW ALARM LED will flash each second accompanied by the alarm beeper High Alarm LED high alarm condition the red HIGH ALARM LED will flash each sec
17. keys During calibration the 9 sign will flash at a once per second rate When the calibration value is set pressing the CALIBRATE or LOCK UNLOCK key will cause the unit to exit the calibration mode and return to normal operation The unit will also revert to normal operation if 10 seconds elapse and no keys are pressed 3 f 5 T and 4 Keys T and J arrow keys are used in conjunction with the CALIBRATE key to calibrate the unit or in conjunction with the LOW SET and HIGH SET keys to adjust the alarm settings When used after pressing the CALIBRATE key pressing the T or J key will raise or lower the displayed oxygen value in 196 increments When either of these keys are held down for more than 1 second the display will scroll at a rate of 4 per second When used after pressing either the LOW SET or HIGH SET keys pressing the T or key will raise or lower the displayed alarm setting in 1 increments In the alarm set mode holding these keys down for more than 1 second will cause the display to scroll at a rate of 496 per second LAS LOW SET Key When the keypad is unlocked pressing the LOW SET key will cause the LOW icon to flash The low alarm setting can then be changed using the T and J arrow keys When the low alarm value is set and the LOW SET or LOCK UNLOCK key is pressed again the unit exits the alarm set mode and returns to normal operation The unit will also revert to normal operation storing the most recen
18. ly repeat the calibration procedure 7 When the calibration value is set press the CALIBRATE or LOCK UNLOCK key again to accept the calibration setting and return to normal operation Note If the message CAL followed by the message Er flashes on the display after entering the desired calibration value the system has determined that the entered value will not allow operation within the specified output range of the sensor This situation may occur if a the operator has inadvertently entered the wrong concentration for the calibration gas b the concentration of the calibration gas is not correct c the sensor is in need of replacement d the operator attempted to adjust the monitor before allowing sufficient time for the calibration gas to purge out the previous sample e the flow and pressure of the calibration gas was not properly regulated Check these items and repeat calibration If calibration error continues to occur contact the service department of the distributor from which the unit was purchased or you may call Maxtec s Customer Service Department directly 2 2 3 Automatic Calibration to Room Air The MAXO 9 Monitor can quickly be calibrated to room air 20 996 using a quick key shortcut command This function saves time by setting the calibration value to 20 9 without scrolling the display 9 To use this function 1 Place the external probe in room air 2 Press the LOCK UNLOCK key to unlock
19. ond accompanied by the alarm beeper Keypad ON OFF Key after Calibration This key is used to turn the instrument on or off When batteries are installed in the unit and the unit is in the power off mode the display will be blank When the ON OFF key is pressed once the unit will start to display the oxygen concentration and the keypad is activated If the ON OFF key is pressed again the unit reverts to the power off mode LOCK UNLOCK Key Pressing the LOCK UNLOCK key will unlock the keypad and cause the LOCKED icon to disappear from the LCD readout The unit can then be calibrated and alarm settings can be changed if desired If no other keys are pressed within 10 seconds the LOCKED icon will reappear and the unit will revert to the LOCKED mode When the unit is in the unlocked state pressing the LOCK UNLOCK key will also cause the LOCKED icon to reappear CALIBRATE Key The Unit will force you to Calibrate the first time power is applied or the sensor is changed This is indicated on the LCD by the word CAL Pressing the CALIBRATE key will allow the T and J arrow keys to calibrate the unit Also when the keypad is unlocked the CALIBRATE key is used in conjunction with the T and J arrow keys to calibrate the unit When the CALIBRATE key is pressed CAL appears on the LCD readout for 1 second and then the measured calibration concentration is displayed The calibration value can then be changed using the T and J arrow
20. or after recalibration flowing gases only Do not use the diverter when performing static sampling such as in incubators oxygen tents oxygen hoods etc A CAUTION The flow diverter for the sensor is for use with 2 SET UP PROCEDURE 2 1 Battery Installation All 2 units are powered by two AA alkaline batteries 2 x 1 5 Volts and are shipped without the batteries installed The battery compartment is accessible from the back side of the unit To install the batteries 1 With the thumb press down on the center of the battery compartment cover and slide the cover off of the instrument case 2 Install the two AA alkaline batteries 2 x 1 5 Volts in the unit observing the orientation shown on the label inside the compartment 3 Slide the battery compartment cover back onto the case Make sure the tabs on the cover snap into position securing the cover flush against the case When batteries are installed in the MAXO2 the unit initiates a self diagnostic test All segments of the LCD readout are turned on for approximately 2 seconds On OM 25ME units the alarm beeper sounds and the high and low alarm LEDs are illuminated When the diagnostic test is completed successfully the word CAL will appear on the display indicating that the unit is ready for calibration 2 2 Calibrating the MAXO 9 Monitor 2 2 1 Before You Begin A protective film covering the threaded sensor face must be removed wait a
21. pproximately 20 minutes for the sensor to reach equilibrium Next the 2 Oxygen Monitor should be calibrated Thereafter Maxtec recommends calibration on a weekly basis However more frequent calibration will not adversely affect product performance More frequent calibration is recommended when e Calibration of the instrument should be performed when the temperature of the gas stream changes by more than 3 degrees Celsius e Changes in elevation result in calibration error of approximately 1 of reading per 250 feet In general calibration of the instrument should be performed when the geographic elevation at which the product is being used changes by more than 500 feet The sensor is best calibrated while mounted in the industry standard 15mm 1 0 adapter As in normal operation the oxygen sensor responds best when installed in a vertical position with the sensor facing down In addition calibration is recommended if the user is unsure when the last calibration procedure was performed or if the measurement value displayed is in question It is best to calibrate the 2 Monitor to a known documented oxygen concentration at a pressure and flow similar to your clinical application Calibrating the gt at lower concentrations with a known oxygen value is also acceptable and may provide additional accuracy if the calibration gas is closer to the environment in which the 2 will be used
22. ration to Room Air 2 2 4 Factors Influencing Calibration 3 OPERATING INSTRUCTIONS 3 4 Alarm Setting Procedure 3 1 1 Low Alarm Setting 3 1 2 High Alarm Setting 3 2 Basic Operation 2 3 3 Alarm Conditions 4 SENSOR REMOVAL AND REPLACEMENT 5 PROBLEM SOLVING ssscsssscticccsiesssstscctsssncncsinedansons 6 CLEANING AND MAINTENANCE 7 SPECIFICATIONS gt cuan pne 7 1 Base Unit Specifications 7 2 Sensor Specifications 8 APPLICATIONS 8 1 Exposure to Anesthetic Gases 8 2 Calibration Techniques in Pressurized 8 3 Calibration Errors 8 4 Atmospheres of High Humidity 9 SPARE PARTS AND ACCESSORIES 10 WARRANTY 1 SYSTEM OVERVIEW 1 1 Base Unit Description The MAXO 9 Model OM 25ME provides unparalleled performance and reliability due to an advanced design that includes the following features and operational benefits Fastresponding oxygen specific galvanic sensor that achieves 90 of final value in approximately 15 seconds at room temperature Extra life oxygen sensor of approximately 900 000 O2 percent hours minimum 2
23. rs in typical applications Volume Dry Interference in 02 75 lt 2 10 lt 2 5 lt 2 5 lt 2 5 lt 2 70 lt 2 6 lt 2 15 lt 2 16 8 APPLICATIONS 8 1 Exposure to Anesthetic Gases Because of the unique chemistry of the oxygen sensors provided with the 2 Monitor there are no significant effects when exposed to commonly used anesthetic gases however the monitor is not designed for exposure to flammable gas mixtures See WARNING page i 8 2 Calibration Techniques in Pressurized Systems Similar to other oxygen sensors the Maxtec MAX series sensors measure the partial pressure of oxygen in a gas stream This is correlated to read percent oxygen on the 2 Monitors It is important to note that the sensor output is directly proportional to the pressure of oxygen Thus one must take into consideration the effect of exposing the sensor to various gas sample pressures For example if a monitor is calibrated to read 20 996 in ambient air atmospheric pressure and then exposed to a pressurized gas sample containing a known concentration of oxygen the monitor will display a reading greater than the actual oxygen percentage This is because the monitor was originally calibrated at atmospheric pressure 0 psig then exposed to a higher pressure sample eg 5 psig The greater the difference in pressure the greater the difference in sensor signal oxygen reading on the monitor By the same token
24. stant Flow rate of sample gas can affect pressure at the sensor in that back pressure at the sensing point may change For these reasons the following is recommended 1 Calibrate the MAXO 9 Monitor at the same pressure as the sample gas 2 If sample gases flow through tubing use the same apparatus and flow rates when calibrating as when measuring 3 The MAXO 9 Monitor oxygen sensor has been validated at pressures up to 2 atmospheres absolute Calibration or operation above this pressure is beyond the intended use Humidity Effect Humidity has no effect on the performance of the Monitor other than diluting the gas as long as there is no condensation Depending on the humidity the gas may be diluted by as much as 496 which proportionally reduces the oxygen concentration from the dry concentration Environments where condensation may occur are to be avoided since condensate may obstruct passage of gas to the sensing surface resulting in erroneous readings and slower response time For this reason the following is recommended 1 Avoid usage in environments greater than 95 relative humidity 2 When used in a breathing circuit place the sensor upstream of the humidifier 11 3 OPERATING INSTRUCTIONS 3 1 Alarm Setting Procedure 3 1 1 Low Alarm Setting To adjust the low alarm setting 1 Press the LOCK UNLOCK key to unlock the keypad 2 Press the LOW SET key The LOW icon will start to flash 3 Use t
25. t alarm value if 10 seconds elapse and no keys are pressed The OM 25ME alarm setting is adjustable down to 18 The OM 25ME L low alarm setting is adjustable to 15 45 a HIGH SET Key When the keypad is unlocked pressing the 125 HIGH SET key will cause the HIGH icon to flash The high alarm setting can then be changed using the T and J arrow keys When the high alarm value is set and the HIGH SET or LOCK UNLOCK key is pressed again the unit exits the alarm set mode and returns to normal operation The unit will also revert to normal operation storing the most recent alarm value if 10 seconds elapse and no keys are pressed SILENT Key In an alarm condition pressing the SILENT key will deactivate the alarm beeper but the alarm LED and display will continue to flash In 120 seconds the alarm beeper will sound again This process will be repeated until the alarm condition is cancelled For an alarm condition to be cancelled the concentration must be 1 higher than the alarm setting in the presence of a low alarm condition or 196 lower than the alarm setting in the presence of a high alarm condition External Probe Sensor with Diverter The sensor with diverter is designed to fit industry standard 15 mm adapters 18 Extendible Cable The extendible cable allows the sensor to be positioned up to 10 feet from the side of the unit 1 3 250 Oxygen Sensor MAX 250E oxygen sensors offer quick
26. the LED and the alarm value digits on the display will continue to flash until the alarm condition has been rectified If the alarm condition still exists 120 seconds after silencing the alarm beeper the beeper will start to sound again A low alarm condition will remain until the actual concentration is 1 higher than the low alarm setting A high alarm condition will remain until the the actual concentration is 1 lower than the high alarm setting 13 4 SENSOR REMOVAL AND REPLACEMENT The OM 25ME is shipped with a new MAX 250E oxygen sensor installed Although the sensor has a very long expected life eventually the sensor will require replacement Removing or installing a sensor when necessary is a very simple procedure To remove and install a new sensor 1 Grasp the sensor in one hand and with the other hand unscrew the cable connector counter clockwise at the sensor 2 Pull out the cable connector plug from the expired sensor 3 Unscrew the flow diverter from the sensor and discard the expired sensor Note The sensor contains lead and lead acetate be sure to dispose of expired sensors in accordance with hospital local state and federal regulations 4 Remove the new sensor from the packaging and remove the protective film from the sensor face 5 Insert the cable connector plug into the receptacle of the new sensor and tighten the cable connector 6 Screw the flow diverter onto the new sensor 7 Wait
27. tion vacuum steam or chemicals To protect the unit from potential leaky battery damage always remove batteries when the unit is going to be stored not in use for 1 month and replace dead batteries with recognized name brand AA Alkaline batteries The OM 25ME L oxygen monitor has been manufactured with a low alarm setting adjustable down to 15 This change is within the guidelines set forth in ASTM Specification F1462 93 The OM 25ME L is labeled to indicate this feature Classification Protection against electric shock Internally powered equipment Protection against water Ordinary equipment Mode of Operation Continuous Sterilization See section 6 Safety of application in the presensence of a flammable aesthetic mixture See section 8 1 FAILURE TO COMPLY WITH THESE WARNINGS AND CAUTIONS COULD RESULT IN INSTRUMENT DAMAGE AND POSSIBLY JEOPARDIZE THE WELL BEING OF THE PATIENT AND OR HEALTH CARE PROFESSIONAL TABLE OF CONTENTS 1 SYSTEM OVERVIEW scssinsiimcinssndeietinaiwaaseioaaauns 1 1 Base Unit Description 1 2 Components Description 1 3 250 Oxygen Sensor 2 SET UP PROCEDURE 2 2 1 Battery Installation 2 2 Calibrating the MAXO 9 Monitor 2 2 1 Before You Begin 2 2 2 To Calibrate the MAXO Monitor 2 2 3 Automatic Calib
28. years in most applications External probe with 10 ft extendible cable and diverter fitting for standard 15 mm T adapter Operation using 2 AA alkaline batteries 2 x 1 5 volts for approximately 3000 hours of performance in typical usage not in alarm conditions For extra extended long life 2 AA lithium batteries may be used Durable compact case that weighs less than 1 pound and permits comfortable hand held operation e Large easy to read 1 2 digit LCD display for readings in the 0 100 range e Adjustable high level and low level alarming capability with flashing LED and audible indication of alarm conditions e Simple operation and calibration using quick calibrate key functions e Self diagnostic check of analog and microprocessor circuitry e Low battery indication D Components Description please refer to page 3 LCD Readout 3 1 2 Digit Display The 3 1 2 digit liquid crystal display LCD provides direct readout of oxygen concentrations in the range of 0 100 It also displays CAL when the calibration mode is entered Sign the calibration mode the sign flashes every second Low Battery Indicator The low battery indicator appears on the LCD display when the power supply voltage drops below acceptable limits When the LOW BAT icon is visible batteries should be replaced immediately LOCKED Status Indicator The presence of the LOCKED icon on the LCD readout
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