AD300 & MD300 - Oxygen analyzer and monitor
Contents
1. N Teledyne Analytical Instruments 11 Introduction AD300 MD300 Note Contact the factory for retrofitting an existing instrument for 3 digit LCD display For RS 232 reconfiguration see Section 2 1 6 In addition to the above instrument configuration options the following optional equipment is available for your instrument DIN flow restrictor for sampling gas cylinder directly P N B 75401 Universal Pole Mounting Clamp P N CP 2343 V Mount Wall Adapter P N B 647 0 1 VDC Interface Cable P NB 75554 RS 232 Interface Cable P N B 75555 1 3 The R17S Sensor How it works The AD300 MD300 uses Teledyne Analytical Instruments Patented R17S 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 This current is sent to the electronics where it is converted into a digital signal and displayed on the LCD Screen A flow diverter is supplied with each R17S sensor for use with the blue T adapter The flow diverter threads onto the end of the sensor and facilitates the transport of gas into the sensor The diverter should be removed for ambient air sampling such as a diving bell CAUTION REMOVE AND SAVE THE DIVERTER WHEN THE SENSOR IS USED IN CONFINED VOLUME AN APPLICATIONS Teledyne Analytical Instruments 12 Porta2. OPERATING amp SERVICE INSTRUCTIONS FOR AD300 PORTABLE OXYGEN ANALYZER MD300 PORTABLE OXYGEN MONITOR P N M AD MD300 06 23 2010 TYPE B EQUIPMENT Equipment providing a particular degree of protection against electric shock particularly regarding e Allowable LEAKAGE CURRENT e Reliability of the protective earth connection if present Teledyne Analytical Instruments AD300 MD300 Copyright 2010 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 resident
3. The minimum detectable change in battery voltage corresponds to an increment of about 50 hours meaning that the battery voltage reading may not change for several hours at a time If the monitor is not used for a period of 30 days or more the batteries should be removed prior to storage 3 4 Sensor Maintenance DO check the sensor for damage or leaks before use DO recalibrate after replacing the sensor DON T immerse the R17S sensor in liquid DON T freeze the R17S 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 consult the Material Safety Data Sheet available from the factory or online at www teledyne ai com for handling guidelines 3 5 Gas Sampling 3 5 1 Discrepancy in Readings The AD300 MD300 instrument should be used to measure the oxygen concentration exiting gas cylinder or another or life support system When a discrepancy in oxygen readings is detected the oxygen analyzer readings should be verified by checking the AD MD300 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 Teledy
4. 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 locale representative or Teledyne for assistance Teledyne Analytical Instruments 34 Portable Oxygen Monitor Service Manual 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 50 5 The ADC circuit failed during POST 6 5 6 A stuck key has been detected The second digit There is no in this example 5 on the display shows which ae key is stuck indication of which key is 0 Low Alarm stuck 1 Batt 2 Cal 3 Up 4 Down 5 Silence 6 High Alarm 7 Alarm Test 8 Key Lock 7 2 7 A failure has occurred during the automatic calibration of the digital to analog converter DAC diepe pe circuit The second digit in this example 2 indication of h thet f diaital t loa fail the type of shows the type of digital to analog
5. 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 37 Appendix AD300 MD300 A 2 Spare Parts List QTY PART NO C72144 R17S B50057 A268 CP 2367 CP 2368 B75401 B99 C74721 Se U HA HA Ha eS Re eS DESCRIPTION Micro Fuel Cell R17S R17S flow diverter Tee adapter 22 mm 22 mm female tube adapter 22 mm male tube adapter Inflator sample adapter assembly AA size alkaline battery Sensor cable assembly A 3 Optional Accessories A585 CP2345 CP2344 B647 B 75554 B 75555 Hd hm hd hd SS hm DIN 300 flow Restrictor Universal Mounting Clamp V mount Pole Clamp V mount Wall Adapter 0 1 VDC Interface Cable RS 232 Interface Cable 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 Teledyne Analytical Instruments 38 Portable Oxygen Monitor Appendix 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 Teledyne Analytical Instruments 39
6. centimeter of water pressure pulse will produce a 0 11 atmosphere or an 11 increase in the total and therefore partial pressure of oxygen An un pressurized reading of 50 oxygen will increase to 55 3 if the sensor is subjected to a pressure of 100cm H20 The reading will rise proportionally less for smaller pressures 2 3 3 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 R17S 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 Teledyne Analytical Instruments 25 Operation AD300 MD300 2 3 4 Discrepancy in Readings When a discrepancy in oxygen readings is suspected the oxygen analyzer readings should be verified by checking the AD MD300 battery condition and calibration using 100 oxygen If the monitor can be cali
7. failure DAC failure 0 Measurement 1 High Test 2 Low Test 3 Offset Cal 4 Gain Cal Teledyne Analytical Instruments 35 Service Manual AD300 MD300 3 8 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 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 includes 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
8. 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 2 2 Use 2 2 1 Gas Sampling The AD MD300 instruments can be used to measure the oxygen concentration in two basic modes Teledyne Analytical Instruments 22 Portable Oxygen Monitor Operation From the low pressure inflator hose using the sample adapter as shown in Figure 2 10 Directly from the high pressure gas cylinder using the optional DIN restrictor shown in Figure 2 11 NOTE Both sample modes require the use of the gas diverter cap and tee adapter as show in Figure 2 3 Make sure you have calibrated the unit before proceeding INFLATOR HOSE SAMPLING Connect the inflator hose adapter supplied with the unit to the tee adapter as shown in Figure 2 10 Open the gas bottle valve and allow gas to flow for approximately 30 seconds When a stable reading is observed close the cylinder valve Allow reading to settle for a few seconds This is the oxygen value of the sample gas Low Pressure Assembly B 77263 To AD MD Inflator Adaptor Analyzer Restrictor 02S Hose Barb Adapter RS 3 16 ID 5 16 OD H 3 16 ID 5 16 OD Vinyl Tubing S Vinyl Tubing 4 F To Low Pressure i E S Inflator Hose Hose Connector Hose Connector TEE Figure 2 10 Low Pressure Gas Sampling HIGH PRESSURE SAMPLING To measure the oxygen co
9. MAGE TO THE UNIT AND A N BATTERIES Note Use alkaline batteries only Other battery types will produce erroneous battery test readings 3 Install 3 AA alkaline batteries into the holder as shown in Figure 2 6 Each battery has its own slot To insure proper polarity place the bottom flat or negative end of the battery in the end of the holder marked Place the top button or positive end of the battery in the end of the holder marked Do this for each battery Figure 2 6 Installing Batteries 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 VO keys are inoperable until a successful calibration is achieved 5 MD300 only To test the batteries Press the BATT TEST key once The battery display located below the oxygen Teledyne Analytical Instruments 17 Operation AD300 MD300 2 1 4 Calibration The AD MD300 should be calibrated before each use Whenever new batteries are in
10. OR 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 2 Plug one end of the coiled cable into the jack receptacle on the back end of the R17S 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 RI7S Sensor 3 Plug the other end of the coiled cable into the receptacle located on the right side of the unit and secure it in place using the capture nut See Figure 2 2 Capture Nut Monitor OON Sensor Connection Connection tt Figure 2 2 Sensor Cable Connection to Monitor Teledyne Analytical Instruments 14 Portable Oxygen Monitor Operation Note When the AD MD300 instrument is used for diffusion sampling the plastic flow diverter must be removed from the R17S sensor If the sensor is used in sample mode the diverter must be used as shown in Figure 2 3 Micro Fuel Cell O Flow N Diverter Sg Sensing E l Tee Surface _ Adapter Figure 2 3 Mounting the Sensor in the Tee Adapter 2 1 2 Mounting The AD MD 300 can be mounted in several ways depending on the optional equipment ordered at the time of purchase See Section 1 2 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
11. UNLOCK a second time unlocks the keypad 2 3 Gas Sampling Sensor Issues 2 3 1 Temperature The R17S oxygen sensor adjusts for ambient temperature changes in the range of 0 40 C 32 106 F However a small thermal tracking error may be encountered when the sensor is subjected to sudden changes in temperature For example removing the sensor from an air conditioned car to a hot environment Holding the sensor in your hand Teledyne Analytical Instruments 24 Portable Oxygen Monitor Operation 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 correct itself in about 30 minutes 2 3 2 Pressure Virtually all gas sensors and monitors measure the partial pressure not the percentage of the gas that they sense The only time that these instruments can accurately read percentages is when the total pressure does not vary over time between calibrations and use This is way it is important to calibrate the AD MD300 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 sample gas that is flowing under pressure the sensor may read high In reality the percentage of oxygen is not changing it is the total pressure that is increasing producing a corresponding increase in the partial pressure of oxygen A hundred
12. acy is desired or the concentration of O2 is in excess of 40 calibration with 100 is recom mended N Teledyne Analytical Instruments 32 Portable Oxygen Monitor Service Manual Symptom Why What To Do The unit has stopped working and the LCD is displaying alphanumeric figures The AD300 MD300 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 Disconnect the batteries and inspect the contacts for corrosion Reconnect the batteries If the unit functions properly calibrate the unit and reset the alarm values B Try anew set of batteries C 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 ina different position may also help Alarm sounds flashes continuously A MD300 Readings are outside alarm limits Adjust high and low alarm setting to be above
13. afety alert symbol These symbols are found in the manual and on the instrument The definition of these symbols is described below CAUTION Refer to the instructions for details on the specific danger These caution symbols warn of specific A N procedures which if not followed could cause bodily Injury and or damage the instrument WARNING This symbol is use to alert the operator of a condition that could cause bodily harm NOTE Additional information and comments regarding a specific component or procedure are highlighted in the form of a note CAUTION THE MONITOR SHOULD ONLY BE USED FOR THE PURPOSE AND IN THE MANNER DESCRIBED IN THIS MANUAL IF YOU USE THE ANALYZER IN A MANNER OTHER THAN THAT FOR WHICH IT WAS INTENDED UNPREDICTABLE BEHAVIOR COULD RESULT POSSIBLY ACCOMPANIED WITH HAZARDOUS CONSEQUENCES Teledyne Analytical Instruments iv Portable Oxygen Monitor Table of Contents Safety Messages ii EKG KEES sential GE Se GE SE GE REKE Ee iv LIST OF FIQUICS OE N OE EE ee ee vii List of Ta DIOS siese ees ees oe ees ee es ee Ge De Ee viii INTOGDUGTION RE OE EEN 9 1 1 Features 11 1 2 Options 11 1 3 The R17S Sensor How it works 12 ear Lo AE EE EE EE EE EE 13 2 1 Setup 13 2 1 1 Sensor Installation or Replacement 13 2 1 2 Mounting 15 2 1 2 1 V Mount Adapter Installation 15 2 1 2 2 Universal Mounting Clamp Installation 16 2 1 3 Battery Installation 16 2 1 4 Calibration 18 2 1 5 Alarms MD300 only 20 2 1 6 O
14. and below O2 value being displayed No display A Batteries expired B Bad battery A Check replace batteries connection B Check battery connections C Calibrate Keys inoperable cannot The LOCK UNLOCK key A Press turn unit off is activated which is LOCK UNLOCK key preventing key operation once LCD will flash indicating keys are active Teledyne Analytical Instruments 33 Service Manual AD300 MD300 Symptom Why What To Do Cannot adjust calibration or alarm settings Critical settings require two keys be pressed in a specific order LOCK UNLOCK key is active A If display is not flashing press lock key once to activate keys Press desired function followed by the Up 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 7 Watchdog The AD300 MD300 is equipped with a watchdog circuit that continuously monitors the electronics for proper operation If the 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
15. and report it to the Customer Service Department at the address below 3 9 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 Teledyne Analytical Instruments 36 Portable Oxygen Monitor Appendix Appendix A 1 Specifications Range Accuracy Response Time Battery Life System Power Sensor Type Expected Life Dimensions Sensor Cable Storage Temp Operating Temp Alarm ranges Alarm accuracy Teledyne Analytical Instruments 0 100 Oxygen 2 of full scale at constant temperature and pressure 90 in less than 8 seconds at 25 C Approximately 2000 hr continuous use in a non alarm condition 3 AA alkaline batteries Class R17S 36 months in air 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 10 30 C continuous 5 50 C Intermittent 0 40 C HI alarm
16. ble 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 2 1 Setup To set up and use your AD300 analyzer or MD300 monitor 1 Install the sensor 2 Install the batteries 3 Calibrate the unit 4 Set the alarms MD300 only The control keys are designed for easy operation A LOCK UNLOCK key has been incorporated to prevent accidental changes to critical settings This eliminates unwanted changes in calibration or alarm settings from accidental touching or bumping of the keys To further reduce the possibly of incorrect adjustments at least two keys must be pressed in order to modify a critical calibration or alarm set point value Note The ALARM SILENCE 2 and BATT TEST key continue to operate normally when the lock feature is activated 2 1 1 Sensor Installation or Replacement Note The R17S 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 Teledyne Analytical Instruments 13 etalon AD300 MD300 WARNING THE SENS
17. brated the unit can be assumed to be in good working order and capable of providing readings to specification If after checking the unit the discrepancy in oxygen readings persists the gas being analyzed should not be used 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 Teledyne Analytical Instruments 26 Portable Oxygen Monitor Operation 2 4 Do s and Don ts DO Read all of the directions before using for the first time Calibrate before every use Visually inspect the sensor for leakage before each use Calibrate using 100 oxygen and check in air Check the HI and LO alarm settings prior to each use Test batteries regularly and replace when battery indicator shows low battery no bars remaining Make sure keys are locked by using the LOCK UNLOCK key feature Keep the unit sensor and connections dry Recalibrate after replacing the batteries Recalibrate after replacing the sensor Use properly installed alkaline batteries only Make sure the R17S sensor is properly attached Remove the plastic flow diverter when analyzing non flowing samples Remove and save the plastic flow diverter when using the sensor in non flowing applications MD300 only Perform an alarm test before each use press the ALARM TEST key DON T Use this monitor if you suspect any malf
18. ess oxygen which will introduce errors into the calibration Air calibration should only be used for monitoring oxygen levels between 21 and 40 and should never be used where a high degree of accuracy is needed CAUTION DO NOT ADJUST THE CALIBRATION SETTINGS IN AIR AFTER THE 100 CALIBRATION AS THIS WILL AN CANCEL THE MORE ACCURATE 100 CALIBRATION THE 100 CALIBRATION MAY BE REPEATED AS MANY TIMES AS DESIRED Teledyne Analytical Instruments 19 Operation AD300 MD300 8 MD300 only Adjust alarm set points to desired level according to the procedures in Section 2 1 5 9 Press the LOCK UNLOCK key to hold settings The unit is now ready for use 2 1 5 Alarms MD300 only 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 MD300 monitor see Figure 2 8 1 To set the HI alarm Press the HI ALARM SET key once Press the UP and DOWN arrow key until the desired value is displayed 9 in the lower right corner of the display Press SS lock key or proceed to LO alarm settings NINN Note The HI and LO alarms may be defeated by setting the HI alarm limit one step above 100 The display will blink ALARM OFF continually in this mode D 2 To set the LO alarm press the LO ALARM SET key once Press the UP and DOWN arrow key 10 al Tm Hag ALARM OFF al to
19. gure 2 8 Setting the Alarms MD300 cceeeeeeeeeeeeeeees 20 Figure 2 9 0 1 VDC or RS 232 Digital Output Port 0 22 Figure 2 10 Low Pressure Gas Sampling sesse ees ee ee 23 Figure 2 11 High Pressure Gas Sampling sse sees sesse sesse ede ee 24 Teledyne Analytical Instruments vii AD300 MD300 List of Tables Table 3 1 Troubleshooting c ccccceeeeeeeeeeeeneeeeeeeeeeeeeeseseaeees 31 Table 3 2 Error COd S c ccccccccccceccceececeeeececceeeceeceecaeeceecueeaeeseeeas 35 Teledyne Analytical Instruments viii Oxygen Analyzer Introduction Introduction OT The Teledyne Analytical Instruments AD300 Oxygen Analyzer here after referred to as AD300 and MD300 Oxygen Monitors with alarms here after referred to as MD300 are portable instruments that provide fast and accurate oxygen monitoring In addition the model MD300 incorporates an audio visual alarm capability These instruments are designed to monitor up to 100 oxygen concentration in breathable gas mixtures Because they are microprocessor based the AD MD300 series 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 MD300 front face interface is shown in Figure 1 1 The AD300 is similar but without the battery and alarm test buttons is shown in Figure 1 2 LCD Bat
20. ial area may cause 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 17S 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 Teledyne Analytical Instruments ii Portable Oxygen Monitor About This Manual The AD300 MD300 Operator s Manual provides both introductory and detailed information for configuring and operating these instruments The manual takes you from the time you unpack the instrument until you complete the first gas analysis The bulk of the manual contains operating procedures and information There are also cautions warnings and guidelines to ensure that your monitor operates normally and to its full potential A troublesh
21. ing device 1 Insert one end of the interface cable into the output port on the side of the instrument See Figure 2 9 2 Insert the other end into the analog recorder device Make sure the device is equipped to handle a 0 1 VDC signal When properly calibrated the output signal generated by the analyzer is linear and proportional to the oxygen concentration If you requested Option B RS 232 digital output at the time of purchase a digital RS 232 signal is output from the output port shown in Figure 2 9 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 N Teledyne Analytical Instruments 21 oporou AD300 MD300 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 4 CAUTION RECORDER RS232 OUTPUT SIGNAL SHOULD ONLY BE CONNECTED TO AN EN60601 1 IEC60606
22. lizes 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 significantly Teledyne Analytical Instruments 31 Service Manual AD300 MD300 Symptom Why What To Do D higher than 21 Take the instrument to a well ventilated area and check the reading again Try calibrating with a known good sensor if this fails see symptom Reading drifts over 2 3 The display is flashing SENSOR The unit has detected a fault in the signal from the sensor Sensor has expired The sensor has been exposed to a gas containing little or no oxygen g Check sensor cable connections and make sure they are completely inserted into the mating connector and the capture nut is firmly in place Expose the sensor in 100 O2 and check calibration The sensor output has fallen to a level where it is no longer usable Replace sensor The oxygen reading fluctuates or appears to be incorrect Like all O2 sensors the R17S detects the changes in the partial pressure of O2 2 During calibration make sure there is no restrictions on exhaust side of sensor If the reading changes with flow the sensor is pressurized or there may be a leak in the system If a high degree of accur
23. ncentration directly from the high pressure cylinder Install the optional DIN connector onto the tank and insert the blue tee adapter and sensor as shown in Figure 2 3 Slowly open the cylinder valve until you detect gas flowing When a stable reading is observed close the cylinder valve and allow the reading to settle for a few seconds This is the oxygen value of the sample gas CAUTION MAKE SURE YOU DO NOT PRESSURIZE THE SENSOR DURING CALIBRATION OR USE AS THIS AN WILL PRODUCE ERRORS IN THE READINGS Teledyne Analytical Instruments 23 Operation AD300 MD300 To AD MD Analyzer O2 Sensor R17S A gie 3 16 ID 5 16 OD ss Vinyl Tubing T 1352 EZ 7 5 Vent P N O Ring CP 2368 Hose Connector A 268 TEE 300 DIN Threaded Pressure Restrictor A585 Figure 2 11 High Pressure Gas Sampling When monitoring for oxygen in confined volumes such as a diving bell the flow diverter must be removed from the R17S sensor so that it does not interfere with the rapid exchange of gases to and from the sensing surface of the sensor CAUTION FAILURE TO REMOVE THE DIVERTER IN THESE APPLICATION AREAS WILL RESULT IN A MARKED LOWERING OF THE RESPONSE TIME OF THE SENSOR The LOCK UNLOCK key can be used to prevent accidental changes to the front panel key adjustments The LOCK UNLOCK key acts as a toggle pressing LOCK UNLOCK once renders inactive all keys except the ALARM SILENCE 22 and BATT TEST MD300 only keys Pressing LOCK
24. ne Analytical Instruments 30 Portable Oxygen Monitor Service Manual unit the discrepancy in oxygen readings persists the problem is most likely elsewhere 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 at 626 934 1592 or can be viewed and downloaded from our web site at www teledyne ai com 3 6 Troubleshooting The AD300 and MD300 oxygen monitors provide a variety of built in safety features that prevent its use when a fault is detected When a unit displays the message V 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 and A Wait 30 minutes and slow or drifts was just removed from recalibrate its sealed bag it may need to run for several hours Sensor will not read below 22 after calibration in 100 O2 Calibration in 100 was invalid or the room air is contaminated with excess oxygen A Recalibrate using dry gas making sure the reading stabi
25. 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 j Teledyne Analytical Instruments 10 Oxygen Analyzer Introduction 1 1 Features The AD300 MD300 are rugged versatile instruments capable of rapidly measuring the oxygen content of breathing gases commonly used for diving purposes Gas analysis is accurate to within 2 of full scale over the operating range of 0 100 at constant temperature and pressure The following features are standard on the AD300 and MD300 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 Rugged high impact ABS construction Splash resistant case Long life 36 months in air class R17S sensor VDC digital output optional RS 232 The MD300 features include the above plus User defined set point controlled concentration alarms Battery test function 1 2 Options The following instrument options are available for both the AD300 and MD300 units A Option 3 digit LCD display instead of 3 1 2 digit B Option RS 232 digital output instead of 0 1 VDC
26. ooting section is available to assist you with common problems and a complete product specifications and spare parts list is included as an appendix A Quick start manual is also supplied which provides the minimum information you need to use the instrument immediately Chapter 1 An introduction to the monitor and its components features and applications Chapter 2 Step by step set up procedures and information Chapter 3 A guide for daily operational maintenance and troubleshooting Appendix Specifications and available spare part options for the monitor and detailed application considerations to aid in troubleshooting etc How To Use This Manual This manual is designed to walk you through the initial set up of the AD300 Portable Oxygen Analyzer and MD300 Portable Oxygen Monitors It also serves as a quick reference guide to help you with specific questions or operating problems Before turning the instrument on you are advised to read the safety information on the next few pages and the information found in Chapters 1 and 2 These Chapters acquaint the user with the instruments use and operation before placing it into operation N Teledyne Analytical Instruments iii AD300 MD300 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 s
27. select a value A built in safety feature will Figure 2 8 Setting the Alarms MD300 not allow you to select a LO alarm value less than 18 Press LOCL key to save settings Note The MD300 is designed to prevent crossing of HI LO alarm settings If you attempt to set the LO alarm higher than the HI alarm it will push the HI alarm setting up as you continue to rise the LO alarm set point This also applies when attempting to set the HI alarm lower than the LO alarm 3 To test the alarms unlock the controls by pressing the LOCK UNLOCK key and then press ALARM TEST key The Lo alarm followed by the HI alarm will blink and the audible visual alarm will are activated for about 1 second 4 To silence the alarm buzzer for 115 seconds press the alarm silence key 42 flashing red indicator light Teledyne Analytical Instruments 20 Portable Oxygen Monitor Operation 5 To disable the alarms set the high alarm set point above 100 Press LOCK UNLOCK key to save settings 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 6 Output 0 1 VDC or RS232 Both the AD300 and MD300 provide 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 record
28. stalled or removed for any reason the defaults to the calibration mode with the LCD display flashing 00 0 Only I O keys are functional at this 5 EP Er point On the MD300 monitor the Ke 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 AD300 only The bar graph indicator is on continuously whenever the instrument is powered on oxygen monitor the CAL and ON OFF alarm set points will also need to be reset after calibration is 1 j completed Note For first time and for routine maintenance Figure 2 7 Calibration Sequence calibrations make sure the sensor and sensor cable are installed correctly before attempting to calibrate the instrument To calibrate the instrument See Figure 2 7 1 2 3 Turn the unit on by pressing the ON OFF I O key Check the batteries by pressing the BAT key If the LCD is not flashing press the LOCK UNLOCK key to unlock the keys LCD will flash indicating changes can be made to the settings If the batteries have just been installed the LCD will flash 00 0 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 Teledyne Analytical Instrumen
29. tery Display Status Alarm Status AE Alarm Setpoint H rr 8 Up Down Keys High Alarm St VEG N Setpoint Low Alarm A High Alarm Set Set sel Battery Test Aa J Alarm Test Calibration F Lock Unlock Alarm i On Off Silence Sensor Status Figure 1 1 MD300 Front View 47 Teledyne Analytical Instruments 9 Introduction AD300 MD300 LCD Battery Display Status Sensor Status Calibration AG Lock Unlock dk EE Alarm Silence On Off Figure 1 2 AD300 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 2 Options for alternate display configuration An integral battery life indicator is displayed continuously on the AD300 and on demand with the MD300 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 R17S 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 N 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 MD300 unit incorporates a dual concentration alarm with individual user defined set points The set points are displayed
30. the battery compartment door by prying up the hinged latch at the bottom of the cover then slide the adapter plate into grooves provided in rear case Replace the battery compartment door and secure door latch See Figure 2 4 Note The door latch is a tight fit onto the battery cover Use a coin to gently pry up the latch Teledyne Analytical Instruments 15 Operation AD300 MD300 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 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 For the MD300 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 j Teledyne Analytical Instruments 16 Portable Oxygen Monitor Operation CAUTION IMPROPER INSTALLATION OF THE BATTERIES MAY RESULT IN DA
31. to be made within this instrument If a problem arises with either of these models that cannot be corrected by recalibration changing the batteries or replacing the sensor as described elsewhere in this manual the unit must be sent back to the factory for repair or replacement See Section 3 9 for instructions on obtaining a Return Merchandise Authorization RMA number before sending a unit back to Teledyne for repair 3 2 Overall Maintenance The AD MD 300 series of instruments require 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 29 Service Manual AD300 MD300 DO Recalibrate after replacing batteries The MD300 instrument incorporates a battery test feature that indicates the approximate amount of useful life remaining on the set of batteries Excessive alarm activation will wear down the battery faster than usual The AD300 instrument continuously displays the battery status bar graph There is no BATT TEST key on the AD300
32. ts 18 Portable Oxygen Monitor Operation connect to a supply of pure dry oxygen flowing at 1 2 liters per minute 5 Wait about 20 seconds to insure the sample line is completely purged with the calibration gas Press the CAL key The LCD will count down from 9 to 0 During this time the microprocessor is measuring the sensor output to determine the gas concentration and selects the calibration range i e 100 or 20 9 When the calibration is complete the LCD will display the gas value Press the LOCK UNLOCK key to save the calibration data Note The AD300 and MD300 can only be calibrated using 100 oxygen or room air 20 9 Improper calibration or use of other gas concentrations will activate the VSENSOR indicator To repeat the calibration press the LOCK UNLOCK key and press the CAL key 6 Remove the sensor from the oxygen supply and confirm the LCD reads less than 22 in room air It is not necessary for it to read exactly 20 9 7 Itis 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 Confined areas such as rooms where high concentrations of oxygen are released may be enriched with exc
33. unction Do not use the instrument if the oxygen readings are drifting Use the instrument in the presence of flammable liquids or gases Use anything but alkaline batteries N Teledyne Analytical Instruments 27 Operation AD300 MD300 Freeze the sensor or instrument Open or try to repair a leaking or broken sensor Immerse the unit or sensor in any liquid Pass hot or cold gas mixtures over the sensor Adjust the reading in air after 100 calibration Use cleaning agents or liquids in the cable receptacles or around the battery compartment Store the unit in hot or humid environment Expose the LCD to excessive sunlight Teledyne Analytical Instruments 28 Portable Oxygen Monitor Service Manual Service Manual 3 1 General Service Information The Teledyne Model AD300 and MD300 series of portable oxygen monitors are 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
34. utput 0 1 VDC or RS232 21 2 2 Use 22 2 2 1 Gas Sampling 22 2 3 Gas Sampling Sensor Issues 24 2 3 1 Temperature 24 2 3 2 Pressure 25 2 3 3 Humidity 25 2 3 4 Discrepancy in Readings 26 Teledyne Analytical Instruments v AD300 MD300 2 4 Do s and Don ts 27 Service Manual sers RE NE VEE EER KA GE VERE ee Ne WE DO KON 29 3 1 General Service Information 29 3 2 Overall Maintenance 29 3 3 Battery Maintenance 29 3 4 Sensor Maintenance 30 3 5 Gas Sampling 30 3 5 1 Discrepancy in Readings 30 3 6 Troubleshooting 31 3 7 Watchdog 34 3 8 Other Problems with the Instrument 36 3 9 Return Authorization for Service 36 Te se EE EE EE EE N 37 A 1 Specifications 37 A 2 Spare Parts List 38 A 3 Optional Accessories 38 WOO so see ee Ge N de Error Bookmark not defined Teledyne Analytical Instruments vi Portable Oxygen Monitor List of Figures E Figure 1 1 MD300 Front VIEW io Es Ee ie Ee ee Ee EO GE 9 Figure 1 2 AD300 Front VIEW esse ee Re ee 10 Figure 2 1 Installing the R178 Sensor 14 Figure 2 2 Sensor Cable Connection to Monitor esse ee 14 Figure 2 3 Mounting the Sensor in the Tee Adapter see 15 Figure 2 4 V Mount Adapter Installation esse Re ee 16 Figure 2 5 Brass Insert for Universal Mounting Clamp 16 Figure 2 6 Installing Batteries cccccceeeeeeeeeeeeeneeeeeeeeeeeeeeeeeaaees 17 Figure 2 7 Calibration Sequence cccceeeeeeeeeeeeeeeeeeeeeeeeeeees 178 Fi
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