YSI 95 Dissolved Oxygen Meter Instruction Manual
Contents
1. YSI Incorporated Model 95 15 SECTION 7 DISCUSSION OF MEASUREMENT ERRORS There are three basic types of dissolved oxygen errors Type 1 errors are related to limitations of instrument design and tolerances of instrument components These are primarily the meter linearity and the resistor tolerances Type 2 errors are due to basic probe accuracy tolerances mainly background signal probe linearity and variations in membrane temperature coefficient Type 3 errors are related to the operator s ability to determine the conditions at the time of calibration If calibration is performed against more accurately known conditions type 3 errors are appropriately reduced Type 1 Errors A Meter linearity error 0 5 of full scale reading or 0 04 mg l at 25 C whichever is greater B Component and circuitry error 0 04 mg l Type 2 Errors A DO errors caused by temperature compensation for measurements at 10 C from calibration temperature 1 of 25 C 20 08 mg l B DO errors caused by temperature measurement errors A maximum 0 2 C temperature error is equal to 30 596 0 04mg L at 25 C Type 3 Errors A Altitude The maximum DO error caused by calibrating to altitude in increments of 100 feet 0 18 lt 0 015 mg l at 25 C B Humidity Errors occur if calibration is performed at less than 100 humidity The worst possible case would be calibration at 0 humidity The error varies with the calibration temperature as follows 02. a power failure or interruption such as when the batteries are removed Each set consists of dissolved oxygen in percent dissolved oxygen in mg L and temperature The Model 95 will also assign a site identity number to each set of readings to allow easy review of the data This feature is useful in situations where transcribing data is difficult or not available While dissolved oxygen is displayed on the screen in or mg L depress the ENTER button and hold it for approximately 2 seconds The meter will flash SAVE on the display along with the current site identity 1 through 50 being used When all 50 sites are full the display will flash FULL S A V E on the screen This message will remain on the screen even after power down until a button is pushed Once you have acknowledged the memory is full any subsequent saved data will begin overwriting existing Ol data starting with site 1 No additional warning will be displayed 4 6 RECALLING STORED DATA 1 To put the Model 95 into the RECALL mode depress the MODE button repeatedly until rel is displayed on the screen along with the site ID number in the lower right corner r cl 2 Depress the ENTER button to review the last set of data that was saved The Model 95 will display the dissolved oxygen in air saturation and temperature Another press of the ENTER button Ol will display the dissolved oxygen in mg L and the temperature 3 Depress the UP ARROW button to
3. filled with MEA probe solution before using the probe Follow the instructions below to install the new membrane cap 3 1 CHOOSNG THE CORRECTMEMBRANE CAP Two different membrane caps are available for the Model 95 The YSI Model 9501 Membrane Cap Kit is supplied with the Model 95 This kit contains six 0 5 mil 0005 membrane caps and a bottle of MEA probe solution KCl NOTE YSI 9501 Membrane Caps offer the fastest response to changes in DO and are recommended by YSI for most applications For conditions with low flow or stagnant water a 1 mil 001 membrane is available YSI Model 9502 Membrane Cap Kit This membrane requires less stirring than the 9501 but has a much slower response Use this membrane when minimal stirring lt 2 sec is available 3 2 MEMBRANE CAP INSTALLATION To install a new membrane cap on your YSI Model 95 dissolved oxygen probe Unscrew and remove the probe sensor guard see Figure 2 Unscrew and remove the old membrane cap Thoroughly rinse the sensor tip with distilled water Hold the membrane cap and add 8 to 9 drops of MEA probe solution about half full Tap the bottom of the cap with your finger a few times to remove any trapped air bubbles war WN CAUTION Do not touch the membrane surface 6 Screw the membrane cap onto the probe tightly by hand to prevent leakage of electrolyte A small amount of probe solution should overflow 7 Shake off any excess probe solut
4. isopropyl alcohol or a solution of 1 4 cup bleach to 1 gallon tap water are suitable for most disinfecting Instruments used with waste water may be disinfected with 5 Lysol if this is more convenient to the user 2 The user shall take normal precautions to prevent radioactive contamination and must use appropriate decontamination procedures should exposure occur 3 If exposure has occurred the customer must certify that decontamination has been accomplished and that no radioactivity 1s detectable by survey equipment 4 Any product being returned to the YSI Repair Center should be packed securely to prevent damage 5 Cleaning must be completed and certified on any product before returning it to YSI PACKING INSTRUCTIONS Clean and decontaminate items to insure the safety of the handler Complete and include the Cleaning Certificate Place the product in a plastic bag to keep out dirt and packing material m ops Use a large carton preferably the original and surround the product completely with packing material 5 Insure for the replacement value of the product YSI Incorporated Model 95 22 Warranty and Repair Cleaning Certificate Organization Department Address City Zip Country Model No of Device Lot Number Contaminant if known Cleaning Agent s used Radioactive Decontamination Certified Answer only if there has been radioactive exposure Cleaning Certified By Name YSI Incor
5. procedure again Secondary display reads ro B Return the system for service Section 9 YSI Incorporated Model 95 17 Troubleshooting Section 8 10 Main reads Probe current too low to calibrate ho 10 Main display reads FAIL A EEPROM has failed to respond in A Return the system for service Section 9 time Secondary display reads 11 Readings on main display don t A Meter is in recall mode A Press MODE button to return to change Normal Operation Section 4 YSI Incorporated Model 95 18 SECTON9 WARRANTY AND REPAIR YSI Model 95 Dissolved Oxygen Meters are warranted for two years from date of purchase by the end user against defects in materials and workmanship YSI Model 95 probes and cables are warranted for one year from date of purchase by the end user against defects in material and workmanship Within the warranty period YSI will repair or replace at its sole discretion free of charge any product that YSI determines to be covered by this warranty To exercise this warranty write or call your local YSI representative or contact YSI Customer Service in Yellow Springs Ohio Send the product and proof of purchase transportation prepaid to the Authorized Service Center selected by YSI Repair or replacement will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the original warranty period
6. 20 Warranty and Repair INTERNATIONAL SERVIC E C ENTERS Section 9 YSI Incorporated Repair Center 1725 Brannum Lane Yellow Springs Ohio 45387 Phone 937 767 7241 E Mail info 2 ysi com SPECIALTY SERMCE CENTERS YSI Incorporated Model 95 21 Warranty and Repair Section 9 CLEANING INSTRUC TIONS NOTE Before they can be serviced equipment exposed to biological radioactive or toxic materials must be cleaned and disinfected Biological contamination is presumed for any instrument probe or other device that has been used with body fluids or tissues or with waste water Radioactive contamination is presumed for any instrument probe or other device that has been used near any radioactive source If an instrument probe or other part is returned or presented for service without a Cleaning Certificate and if in our opinion it represents a potential biological or radioactive hazard our service personnel reserve the right to withhold service until appropriate cleaning decontamination and certification has been completed We will contact the sender for instructions as to the disposition of the equipment Disposition costs will be the responsibility of the sender When service is required either at the user s facility or at YSI the following steps must be taken to insure the safety of our service personnel 1 In a manner appropriate to each device decontaminate all exposed surfaces including any containers 70
7. 9 4 6 RECALLING STORED DATA RE 9 4T ERASING STORED ennemis tive arbore ebore tator on Nebenwerte 10 4 8 TOGGLING BETWEEN SATURATION AND 11 4 9 DISSOLVED OXYGEN FILTER 4 11 4 10 DISPLAY BACKLIGHT 2 2 2 2 sr a cette eiecti e ect ecce ted eec e thee ee ect ec ens 11 SECTION 5 PRINCIPLES OF OPERATION 12 5 1 MBA CEARKOXYGEN SENSOR u ee ette ette ee tr te teo eee e een 12 5 2 DO READINGS FROM THE CATHODE REDUCTION pp 13 5 3 FORMATION OF AG L AT THE ANODE sen e mE 13 5 4 FUNCTION OF THE ELECTROLYTE Ne 13 SECTION 6 MAINTENANCE OF THE MEA SENSOR eee eene eee eene en eene eene eene tnos ense ense eese eene stesse eene eEe een 14 6 1 ANODE SER VICE 14 6 2 CATHODE SERVICE usa reete 14 6 3 DISSOLVED OXYGEN PROBE PRECAUTIONS pe 15 6 4 PROBE STORAGE d uononmuadaceenauasaneadaseneseugdeusedaedaneneuedeusnaueneneuadedcdensud 15 SECTION 7 DISCUSSION OF MEASUREMENT ERRORS eere e eese eene eo etos tne e toe tn etae e ense tne ene eene eee eEe eene 16 SECTION 8 TROUBLESHOOTING vssccccssicsscvcssesccsssucsssststesecossiesseesseevstesssanseucivscseiesvecssstsvsesdestessscestiessevsssvcseveivecsetesss 17 SECTION 9 WARRANTY AND REPAIR 19 APPENDIX A GENERAL SPECIFICATION csscsssssssssccsscssscssccssscsssssscssccsnsesscssccssssscssccssscssssaccsncensecenscsnsensees 24 APPENDIX B REQUIRED NOTICE scsciccescccheccicss
8. C 0 09 mg l Approximating The Error It is unlikely that the actual error in any measurement will be the maximum possible error A better error approximation is obtained using a root mean squared r m s calculation r m s error 1a 1b 2a 2b 3b mg l NOTE This calculation is for a near extreme set of conditions If the probe is calibrated in water saturated air then type 3B errors humidity the largest error of all types is virtually eliminated and the maximum possible error is in the order of 0 1 mg L for the case of calibrating around 25 C YSI Incorporated Model 95 16 SECTION 8 TROUBLESHOOTING 1 Instrument will not turn on A Low battery voltage A Replace batteries Section 2 B Batteries installed wrong B Check battery polarity Section 2 C Meter requires service C Return system for service Section 9 2 Instrument will not calibrate A Membrane is fouled or damaged A Replace membrane cap Section 3 B Probe anode is fouled or dark B Clean anode Section 6 C Probe cathode is fouled C Buff cathode Section 6 D System requires service D Return system for service Section 9 3 Instrument locks up A Instrument has rec d a shock A amp B Remove battery lid wait 15 BBaltenesarelow orduin ged seconds for reset replace lid Section 2 C Return system for service Section 9 C System requires service 4 Dissolved Oxygen readings Cal altitude is incorrect Reca
9. move up YSI Incorporated Model 95 9 Operation Section 4 through the Saved sets of data 4 Depress the DOWN ARROW button to move down through the saved sets of data 5 When you have finished recalling data press MODE two times to return to normal operation NOTE The Model 95 will recall data as a list When the UP ARROW is depressed the Model 95 will display the Site ID for the previously recorded date For example If you are reviewing Site ID 5 and the UP ARROW is depressed the Model 95 will display Site ID 4 If you are reviewing Site ID 5 and Site ID 5 was the last set of data stored the DOWN ARROW button will display Site ID 1 Here is an example of the Model 95 memory Site ID 1 Site ID 2 Site ID 3 lt the UP ARROW button was pressed the Model 95 would display Site ID 2 Site ID 4 Site ID 5 4 7 ERASING SIORED DATA 1 To erase the data that is stored in the Model 95 s memory depress the MODE button until the Model 95 displays ErAS on the screen 2 Depress and hold the DOWN ARROW and ENTER buttons simultaneously for approximately 5 seconds r A S 3 When the Model 95 has successfully erased data the display reads DONE for 1 to 2 seconds The instrument will automatically change to normal operation after completion and the next saved data will be stored in site ID 1 IMPORTANT Using the erase function forever and completely erases data in all 50 site ID s Do not use the erase function un
10. oxygen sensor exhibits erratic behavior such as a current rise at a rate of 1 hour or very jumpy readings it can be serviced by buffing You can use a few light twists against the surface with the wet microcloth mounted on the buffing tool provided in the 9503 reconditioning kit YSI Incorporated Model 95 14 Maintenance of the MEA Sensor Section 6 Note The MEA sensor does not require buffing cleaning every time the membrane cap 15 changed Under normal operating conditions the MEA sensor should be buffed no more than two times per year Cathode Cleaning Procedures Y Remove the membrane cap and rinse the sensor thoroughly with deionized or distilled water Y Place the microcloth on the buffing tool self adhesive Wet the microcloth thoroughly with deionized or distilled water Y Twist the buffing tool back and forth three times in opposite directions while lightly pressing the buffing tool against the sensor surface see figure 6 Y Rinse the sensor surface well with deionized or distilled water after buffing 6 3 DISSOLVED OXYGEN PROBE PRECAUTIONS Membrane life depends on usage If the probe is properly maintained one membrane cap should last two to four weeks depending on how often the probe is used and the type of samples measured It is recommended that membrane caps not be re used 1 To keep the electrolyte from drying out store the probe in a moist environment such as the calibration chamber with the wet sponge insid
11. two fingers to press and release both the UP ARROW and DOWN ARROW buttons at the same time DOWN ARROW slightly ahead Figure 4 YSI Incorporated Model 95 7 Operation Section 4 3 The LCD will prompt you to enter the local altitude in hundreds of feet Use the arrow keys to increase or decrease the altitude When the proper altitude appears on the LCD press the ENTER button once EXAMPLE Entering the number 12 here indicates 1200 feet 4 The LCD will prompt you to enter the salinity of the sample s that you will be measuring You can enter any number from 0 to 80 ppt Use the arrow keys to increase or decrease the salinity setting When the proper salinity appears on the LCD zero for fresh water press the ENTER button 5 The Model 95 should now display CAL in the lower left of the display the calibration value should be displayed in the lower right of the display and the current DO reading before calibration should be on the main display Make sure that the DO reading large display is stable then press the ENTER button The display should read SAVE then should return to the Normal Operation Mode For best results e Each time the Model 95 is turned off re calibrate before taking measurements e Calibrate at a temperature within 10 C of the sample temperature 4 3 MAKING MEASURMENTS The Model 95 has four modes gt Dissolved Oxygen A measurement of oxygen in percent of air saturation partial pressur
12. DIX C ACCESSORIES AND REPLACEMENT PARTS The following parts and accessories are available from YSI or any Franchise Dealer authorized by YSI YSI Incorporated Model 95 27 APPENDIX D UNITCONVERSION Conversion Chart a Malipy by 2808359 Degrees Celsius Degrees Fahrenheit 9 5 C 32 Degrees Fahrenheit Degrees Celsius 5 9 F 32 Milligrams per liter mg l Parts per million ppm Multiply by 1 YSI Incorporated Model 95 28 APPENDIX E OXYGEN SOLUBLITY TABLE Solubility of Oxygen in mg l in Water Exposed to Water Saturated Air at 760 mm Hg Pressure Salinity Measure of quantity of dissolved salts in water Chlorinity Measure of chloride content by mass of water 5 9 00 1 80655 x Chlorinity Chlorinity 0 5 0 ppt 10 0 ppt 15 0 ppt 20 0 ppt 25 0 ppt Salinity 0 9 0 ppt 18 1 NE B 27 1 ECC 36 1 cc 45 2 ERE E oe 3 ome we uw n ws ao osa xm um ww wx se eo ome um ws we sn xw uw our ws 399 a ow oux w m on s me wma ms se s su me x sw e s s m me s ww ws ws sw ome am ox am oo oes oor YSI Incorporated Model 95 29 Oxygen Solubility Table Appendix E Temp Chlorinity 0 5 0 ppt 10 0 ppt 15 0 ppt 20 0 ppt 25 0 ppt Salinity 0 18 1 ppt 27 1 ppt This table is provided for your information only It is NOT required when calibrating the Mode
13. YSIincorporated a a a a a a a a a a a a a a a a a a a a a a a a a a MODEL 95 Handheld Dissolved Oxygen And Temperature System Operations Manual CONTENTS SECTION INTRODUCTION Pr UN 1 SECTION 2 PREPARING THE METER eee eee se sosoossesss sossosesssssssossesssssssossessssssossessessssossesssosossosseossessesoss 2 2 T NPACKING tee e tec d t UAE 2 22 WARRANTY dde eee 2 2 ER 2 2 4 CALIBRATION STORAGE oce o ese ee bee ERE ERE ER E Eon ETE o er TEE KE CE ERE EUER GE ERR REPE E ERE 3 DS LAND sre odo etn is eit en iba ace in tenete inedit OEE tecto iue peu 3 226 EHE METER CASE He ek 3 SECTION 3 PREPARING THE PROBE eseeseesessescescesescescescesescesoeseecescesceseesescesceseecescsceseesescescescesescesceseeesessesceseesessescesee 4 3 1 CHOOSING THE RIGHT MEMBRANE CAP Ne 4 3 2 MEMBRANE CAP INSTALLATION Ne 4 SECTION 4 OPERATION p sa e 6 4 1 TURNING THE INSTRUMENT ON eene enne nennen nennrse nnn n 7 42 CATIBRATION sette ecce edente ect dec cete ede tete ede ect einen eee de e ee eno 7 42 3 WAKING MEASUREMBNTS GENDER NEG ees 8 AA STIRBING ne eh 9 Z SAVINGADATA ETE E eue eM E I AD e D
14. amber cover in place The battery chamber cover is marked with the words OPEN and CLOSE NOTE On some models the battery cover thumbscrew may be unscrewed by hand a screwdriver may not be required Battery chamber Hand strap cover Thumb screw Polarity marking YSI Incorporated Model 95 2 Preparing the Meter Section 2 There is a small molded insert inside each of the two battery chamber sleeves These labels illustrate the correct way to install the batteries into each sleeve of the battery chamber CAUTION It is very important that the batteries be installed ONLY as illustrated The instrument will not function and may be damaged if the batteries are installed incorrectly Turn the instrument on by pressing and releasing the ON OFF button on the front of the instrument The liquid crystal display LCD should come on Allow a few seconds for the instrument to complete its diagnostic routine If the instrument does not operate consult Section 8 Troubleshooting You may also want to take the instrument into a dark room and with the instrument ON hold down the LIGHT button The instrument back light should illuminate the LCD so that the display can be easily read 2 4 CALIBRATION STORAGE CHAMBER The Model 95 has a convenient calibration storage chamber built into the instrument s side This chamber provides an ideal storage area for the probe during transport and extended non use If you look into the cha
15. e gt Dissolved Oxygen mg L A measurement of oxygen solubility in mg L Recall Allows previously stored data to be displayed gt Erase all Allows ALL previously stored data to be deleted Temperature is displayed in both dissolved oxygen modes NOTE When you turn the Model 95 off it will remember which DO mode you used last and will return to that mode the next time the instrument is turned on To change between the Model 95 modes simply press and release the MODE button The Model 95 will cycle through the modes as follows Dissolved Oxygen Dissolved Oxygen Recall Erase all in with C in mg L with C YSI Incorporated Model 95 8 Operation Section 4 4 4 STRRING It is important to realize that even a small amount of stirring will improve the DO and temperature response times in stagnant water because the transfer process of heat and oxygen will be facilitated by convection Also the MEA dissolved oxygen probe is not totally stirring independent due to the consumption of oxygen at the sensor tip during measurement When taking dissolved oxygen measurements in totally stagnant samples the probe must be moved through the sample at a rate of 2 inches per second to provide adequate stirring 4 5 SAVING DATA The Model 95 is equipped with a non volatile memory that is capable of storing up to 50 different sets of readings Non volatile means that you do not need to worry that your data will be lost due to
16. e 2 Erratic readings are a result of loose wrinkled damaged or fouled membranes or from large more than 1 4 of the circumference of the probe bubbles in the electrolyte reservoir If erratic readings or evidence of membrane damage occurs you should replace the membrane cap and the KCI solution The average replacement interval is two to four weeks 3 If the membrane is coated with oxygen consuming e g bacteria or oxygen evolving organisms e g algae erroneous readings may occur 4 Chlorine sulfur dioxide nitric oxide and nitrous oxide can affect readings by behaving like oxygen at the probe If you suspect erroneous readings it may be necessary to determine if these gases are the cause 5 Avoid any environment that contains substances that may attack the probe materials Some of these substances are concentrated acids caustics and strong solvents The probe materials that come in contact with the sample include FEP Teflon stainless steel epoxy polyetherimide and the polyurethane cable covering 6 Do not allow the probe to strike hard objects The membrane or sensor inside may be damaged 6 4 PROBE STORAGE For long term storage 4 weeks remove the membrane cap thoroughly rinse the MEA sensor with deionized or distilled water and install a new membrane cap filled with MEA probe solution Store the sensor in a humid environment such as the calibration chamber with the wet sponge inside Do NOT store the probe dry
17. emperature compensation Data storage for 50 sets of readings with on screen recall Waterproof case IP65 The YSI Model 95 has a non detachable combination sensor available with cable lengths of 10 25 50 or 100 feet The Model 95D has a detachable cable The probe utilizes easy to install cap membranes and the probe body has been manufactured with stainless steel to add rugged durability and sinking weight The silver anode of the MEA DO sensor requires no servicing for up to 10 000 hours four years of operation under normal operating conditions no sulfite contamination The Model 95 s micro processor allows the system to be easily calibrated with the press of a few buttons Additionally the micro processor performs a self diagnostic routine each time the instrument is turned on The self diagnostic routine provides useful information about the function of the instrument and probe For a list of these diagnostic codes see Section 8 Troubleshooting A probe calibration storage chamber is built into the instrument case A small moist sponge in the chamber provides a water saturated air environment that is ideal for air calibration of the dissolved oxygen probe This chamber also provides a convenient place to store the probe when the system is not in use The Model 95 case is waterproof rated to IP65 allowing operation in the rain without damage to the instrument Six AA sized alkaline batteries power the Model 95 A new set of alkaline ba
18. gen is reduced at the gold cathode The current resulting from this reduction 15 diffusion limited and 15 proportional to the partial pressure of oxygen in the sample The counter reaction is the oxidation of silver at the anode reference electrode that completes the overall electrolytic reaction in the chloride medium KCI electrolyte behind the membrane These reactions at the cathode and the anode are as follows Cathode reaction O 290 4e gt 40H Anode reaction Ag CI gt AgCl e YSI Incorporated Model 95 12 Principals of Operation Section 5 5 2 DO READINGS FROM THE CATHODE REDUCTION The oxygen reduction current is sampled and processed by the meter and displayed as either air saturation or mg L While the parameter of air partial pressure is independent of temperature and salinity mg L solubility of oxygen is a function of temperature and salinity The same air reading same partial pressure would give a higher mg L reading at a lower temperature than at a higher temperature The higher the salinity the lower the solubility mg L is for the same air reading at the same temperature 5 3 FORMATION OF AgCI AT THE ANODE While the oxygen reduction current passes through the internal circuit to be reported as the DO reading it also passes through the anode oxidizing the silver and forming a thin layer of silver chloride Furthermore the oxidation of silver at the chloride medium provides a stable potential
19. he Model 95 comes equipped with a backlight that will illuminate the display so that it can be easily read To activate the backlight press and hold the LIGHT button The display will remain lit as long as the button is depressed When you let it up the light goes out to preserve battery life YSI Incorporated Model 95 11 SECTON5 PRINCIPLES OF OPERATION 5 1 MEA CLARK OXYGEN SENSOR The MEA microelectrrode array is a steady state Clark type polarographic voltammetric dissolved oxygen sensor The sensor is made of a silver anode and a gold cathode consisting of 100 very small electrodes each measuring approximately 8 micrometers in diameter and is separated from the measured medium by a semi permeable Teflon membrane The small dimensions of each individual micro surface consume a very small amount of oxygen Large spacing between adjacent microsurfaces allows for minimal overlap of diffusion layers from adjacent cathode surfaces This design produces the minimal stirring dependence of the MEA probe The temperature sensing MK p Temperature sensor Anode silver A iN Figure 5 MEA Cathode gold element thermistor assembly is mounted next to the oxygen sensor vertically see Figure 1 providing temperature readings for the DO system The membrane selectively allows oxygen to permeate into the sensor but prevents most interfering molecules and fouling materials from entering Upon permeating through the membrane oxy
20. ion and rinse the stainless steel thoroughly with distilled water to prevent corrosion YSI Incorporated Model 95 4 Preparing the Probe 3 I Unscrew Unscrew guard P Screw cap on tightly by hand Figure 2 fm Ma 3 Y AN Screw guard on tightly by hand Section 3 Fill new membrane cap with 8 9 drops of MEA probe solution Tap cap with finger to remove bubbles YSI Incorporated SECTION 4 OPERATION The following diagram is an overview of the operation of the Model 95 See the following sections for details of operation Dissolved Oxygen reading Temperature reading toggle between 78 Press both for DO filter Press both for DO calibration Hold 2 seconds to SAVE data Figure 3 YSI Incorporated Model 95 6 Operation Section 4 4 1 TURNING THE INSTRUMENTON With the batteries installed correctly press the ON OFF button The instrument will activate all segments of the display for a few seconds which will be followed by a self test procedure which will last for several more seconds During this power on self test sequence the instrument s microprocessor is verifying that the system is working properly If the instrument were to detect a problem a continuous error message would be displayed See the section entitled Troubleshooting for a list of error messages NOTE It is normal for an error to be displayed for a second or two when the system is first turned
21. isssssiccssccessccssedcssssthesssessssstessscdsscssscsstesscsdesssessssisssssdessdssecsbesssesssssstess 26 APPENDIX ACCESSORIES AND REPLACEMENT PARTS 22 22s 20s02000202020002000000000neennennnenneensesnsennesnsennnene 27 APPENDIX D UNIT CONVERSIQN ee ccseeesseses erosion 28 APPENDIX E OXYGEN SOLUBILITY TABLE e eee eee eere eee 29 APPENDIX CALIBRATION VALUES TABLE 22 220220020002000002000000000000nsennnenneensennnennesnsennnennssnsennnennensenssnennsnsene 31 ii SECTON1 INIRODUCTON The YSI Model 95 Handheld Dissolved Oxygen and Temperature System is a rugged micro processor based digital meter with an attached YSI microelectrode array MEA dissolved oxygen probe The MEA sensor eliminates the need for stirring in most environmental applications allowing measurement of DO in the field without an external stirring device It also reduces measurement errors caused by insufficient or inconsistent stirring The YSI Model 95 has the following features Microprocessor control Minimal stirring dependence Low maintenance MEA DO probe Push button calibration Cap membranes for easy membrane replacement Simultaneous display of temperature and DO in 96 air saturation or mg L Automatic salinity compensation with manual entering of salinity value Automatic t
22. l 95 in accordance with the instructions outlined in the section entitled Calibration YSI Incorporated Model 95 30 APPENDIX F CALIBRATION VALUES TABLE Calibration values for various atmospheric pressures and altitudes Note This table is for your information only It is not required for calibration Pressure Inches Pressure Pressure Altitude Altitude Calibration 29092 0 eo 1961 5 9527 e 1853 2933 993 558 ilb 2874 Bo 1973 1l2 9 2752 699 19320 119290t 26 34 82 34906 106 88 23 62 600 80 20 63 54 1699 20 35 10293 YSI Incorporated Model 95 31 YSIincorporated 1700 1725 Brannum Lane Yellow Springs Ohio 45387 USA 800 765 4974 937 767 7241 FAX 937 767 9320 Website http www ysi com E MAIL environmental Q ysi com ITEM 059976 DRW A59976D October 1998
23. ld cathode but the cathode is a microelectrode array Since the current of the MEA oxygen sensor is so much smaller on average 100 times smaller than the current of YSI conventional oxygen sensors consumption of the silver anode due to the formation of AgCl is minimal during the lifetime of the probe There should not be any significant build up of silver chloride at the surface of the anode for 3 to 4 years therefore the anode should not require chemical cleaning However if the surface of the silver anode has become fouled gently wet sand it using 400 grit wet dry sandpaper rinse thoroughly with deionized or distilled water and wipe with a wet paper towel until the dark layer is removed The directions are as follows Anode Cleaning Procedures See figure 6 Y Rinse the sensor thoroughly after removing the membrane cap Y Use wet 400 grit sandpaper to sand away the top layer of the anode by wrapping the sandpaper around the anode and gently rotating it until the dark layer is removed Y Rinse the anode thoroughly with deionized or distilled water and wipe with a wet paper towel Y Rinse the anode again with deionized or distilled water Anode Cathode Buffing Tool De Press lightly against sensor surface Wet microcloth Figure 6 6 2 CATHODE SERMCE Warning Under no circumstances should the gold cathode surface the MEA surface be sanded Sanding will permanently damage the condition of the MEA surface If the MEA
24. librate w correct value Section inaccurate 4 Probe not in 10096 water saturated air during Cal procedure Moisten sponge amp place in Cal hamb be amp Recal tion 4 Membrane fouled or damaged chamber wh probe SE Probe anode is fouled or dark Probe cathode is fouled d Secon 0 i Buff cathode Section 6 System requires service Return system for service Section 9 5 LCD displays LO BAT A Batteries are low or damaged A Replace batteries Section 2 6 Main Display reads OVEr A Temperature reading is gt 45 C In all cases check calibration values and dures Section 4 Secondary display reads ovr B Temperature reading is lt 5 C Process ete On ui If each of these were done correctly Secondary display reads udr 7 C DO temperature is gt 45 C return instrument for service Section 9 D DO saturation is 250090 E DO concentration is gt 50 mg L F Probe current too high to calibrate 7 Main display reads PErr A Incorrect sequence of keystrokes A Refer to manual section for step by step instruction for the function you are attempting 8 Main display reads Err A System has failed its RAM test check A Turn instrument OFF and back ON dure in Secondary display reads PEOR n B Return the system for service Section 9 9 Main display reads Err A System has failed its ROM test check A Turn instrument OFF and back ON
25. mber you should notice a small round sponge in the bottom Carefully put about 10 drops of clean water into the sponge Turn the instrument over and allow any excess water to drain out of the chamber The wet sponge creates 10096 water saturated air environment for the probe that is ideal for dissolved oxygen calibration 2 5 HAND SIRAP SIE The hand strap see figure on previous page is designed to allow comfortable operation of the Model 95 with minimum effort If the hand strap is adjusted correctly it is unlikely that the instrument will be easily dropped or bumped from your hand To adjust the hand strap on the back of the meter unsnap the vinyl cover and pull the two Velcro strips apart Place your hand between the meter and the strap and adjust the strap length so that your hand is snugly held in place Press the two Velcro strips back together and snap the vinyl cover back into place 2 6 MEIER CASE The meter case is sealed at the factory and is not intended to be opened except by authorized service technicians Do not attempt to separate the two halves of the meter case as this may damage the instrument break the water proof seal and may void the manufacturer s warranty YSI Incorporated Model 95 3 SECTION 3 PREPARING THE PROBE The YSI Model 95 dissolved oxygen probe is shipped wet with a shipping membrane installed This protective membrane cap on the probe tip must be removed and replaced with a new membrane cap
26. on 4 2 CALIBRATION Dissolved oxygen calibration must be done in an environment with a known oxygen content Since the amount of oxygen in the atmosphere is known it makes an excellent environment for calibration at 10096 relative humidity The calibration storage chamber contains moist sponge to create a 10096 water saturated air environment Before calibrating the YSI Model 95 complete the procedures discussed in the Preparing the Meter and Preparing the Probe sections of this manual To accurately calibrate the YSI Model 95 you will need to know the following information e The approximate altitude of the region in which you are located e The approximate salinity of the samples that you will be measuring Fresh water has a salinity of approximately zero Sea water has a salinity of approximately 35 parts per thousand ppt If you are not certain what the salinity of the sample water is use a YSI Model 30 Salinity Conductivity Temperature system to determine it 1 Ensure that the sponge inside the instrument s calibration chamber is wet Insert the probe into the calibration chamber 2 Turn the instrument on by pressing the ON OFF button Wait for the dissolved oxygen and temperature readings to stabilize usually 15 minutes is required after turning the instrument on If the instrument was already on press the MODE button until dissolved oxygen is displayed in mg L or air saturation To enter the calibration menu use
27. or at least 90 days from date of repair or replacement Limitation of Warranty This Warranty does not apply to any YSI product damage or failure caused by 1 failure to install operate or use the product in accordance with YSI s written instructions ii abuse or misuse of the product iii failure to maintain the product in accordance with YSI s written instructions or standard industry procedure iv any improper repairs to the product v use by you of defective or improper components or parts in servicing or repairing the product or vi modification of the product in any way not expressly authorized by YSI THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE YSTs LIABILITY UNDER THIS WARRANTY IS LIMITED TO REPAIR OR REPLACEMENT OF THE PRODUCT AND THIS SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY DEFECTIVE PRODUCT COVERED BY THIS WARRANTY IN NO EVENT SHALL YSI BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECTIVE PRODUCT COVERED BY THIS WARRANTY YSLIncorporated Model 95 19 Warranty and Repair Section 9 AUTHORIZED US SERVICE CENTERS North and East Region YSI Incorporated Repair Center 1725 Brannum Lane Yellow Springs Ohio 45387 Phone 800 765 4974 937 767 7241 E Mail info ysi com YSI Incorporated Model 95
28. or in stagnant water or lt 1 at a flow rate of 2 in sec at 100 nA nominal current Data Storage 50 points with ID number YSI Incorporated Model 95 25 APPENDIX B REQURED NOTICE The Federal Communications Commission defines this product as a computing device and requires the following notice This equipment generates and uses radio frequency energy and if not installed and used properly may cause interference to radio and television reception There is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures re orient the receiving antenna relocate the computer with respect to the receiver move the computer away from the receiver plug the computer into a different outlet so that the computer and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington DC 20402 Stock No 0004 000 00345 4 YSI Incorporated Model 95 26 APPEN
29. porated Model 95 Section 9 23 APPENDIX A GENERAL SPECIFICATIONS Materials ABS Stainless Steel and other materials Dimensions Height 9 5 inches 24 13 cm Thickness 2 2 inches 5 6 cm Width 3 5 inches max 8 89 cm Weight 1 7 pounds w 10 cable 77 kg Display 2 3 W x 1 5 L 5 8 cm W x 3 8 cm L Power 6 AA size Alkaline Batteries included Approximately 150 hours operation from each new set of batteries Automatic shutoff after 4 hours without a key press Water Tightness Meets or exceeds IP65 standards Operating Environment Medium fresh sea or polluted water and most other liquid solutions Temperature 5 to 45 C Depth 0 to 10 0 to 25 0 to 50 or 0 to 100 feet depending on cable length Storage Temperature 5 to 55 C System Performance Specifications Dissolved Oxygen 0 to 500 Air Sat 0 1 Air Saturation 2 or 0 2 mg L whichever is greater 0 to 200 air 0 to 50 mg L 0 01 mg L 5 for 200 to 500 air DO Response Time Application dependent Typically 60 sec for 95 of the change at 25 C Temperature Response Time Typically 95 of the change Temperature Compensation Automatic YSI Incorporated Model 95 24 Salinity Compensation Range 0 to 80 ppt compensation between 40 and 80 is based on extrapolation Stirring Dependence 0 5 mil membrane 546 error in stagnant water or 296 at a flow rate of 2 in sec at 120 nA nominal current 1 mil membrane lt 3 err
30. that the cathode potential is referenced to for instance the polarization potential of the cathode is 1 0 V versus the potential of the Ag AgCl redox couple at the silver anode Since the current of the MEA sensor is so small there should not be any significant accumulation of AgCl at the anode for 3 to 4 years 5 4 FUNCTION OF THE ELECTROLYTE There are two main functions for the electrolyte 1 Supply the chloride CI to the anode reference electrode for the counter reaction of the oxygen reduction at the cathode 2 Provide the ionic conduction of electricity inside the cell especially in the thin layer between the gold cathode and the membrane Under normal operating conditions such as measuring oxygen around 100 air saturation 8 27 mg L at 25 C the electrolyte should last up to 500 hours This translates into about 62 5 working days at 8 hours per day operation The actual electrolyte life however may be shorter since in most environmental applications membrane fouling determines the life of the electrolyte membrane YSI Incorporated Model 95 13 SECTION 6 MAINTENANCE OF THE MEA SENSOR 6 1 ANODE SERVICE Warning Under no circumstances should ammonium hydroxide be used to clean the silver anode Ammonium hydroxide will permanently damage the condition of the MEA surface The MEA oxygen sensor is in principle the same as the conventional Clark oxygen sensor in that the sensor is made of a silver anode and a go
31. til all recorded data has been transcribed to an archive outside the Model 95 YSI Incorporated Model 95 10 Operation Section 4 4 8 TOGGLING BETWEEN 96 AIR SATURATION AND MG L The UP ARROW key allows quick and convenient switching between the two DO parameters without going through the instrument s four modes using the MODE key Press the UP ARROW key to toggle the DO reading between air saturation and mg L 4 9 DISSOLVED OXYGEN FILTER The Model 95 is equipped with a DO filter to help filter out instability and high frequency noise This feature is useful when measuring dissolved oxygen in an unstable environment such as a fast moving stream or an aeration tank The default option for the filter is off To activate the filter enter the filter option menu by pressing both the DOWN ARROW and MODE keys together Y key slightly ahead Operation procedures e Press both the DOWN ARROW and MODE keys together Y key slightly ahead The current status of the filter is displayed On or OFF with a smaller FIL displayed in the bottom right corner of the screen On e Press the UP ARROW or DOWN ARROW key to change the current status of the filter option e Press ENTER to confirm the change e To abort any changes and exit the filter menu press the MODE key instead of ENTER FIL 4 10 DISPLAY BACKLIGHT At times it may be necessary to take measurements with the Model 95 in dark or poorly lit areas To help in this situation t
32. tteries will provide approximately 150 hours of continuous operation When batteries need to be replaced the LCD will display a LO BAT message The YSI Model 95 is designed for use in environmental aquaculture and industrial applications where accurate dissolved oxygen and temperature measurements are desired with minimal stirring YSI Incorporated Model 95 1 SECTION 2 PREPARING THE METER 2 1 UNPACKING When you unpack your new YSI Model 95 Handheld Dissolved Oxygen and Temperature System for the first time compare the packing list with the contents of the shipping box If there is anything missing or damaged call the dealer from whom you purchased the Model 95 If you do not know which authorized dealers sold the system to you call YSI Customer Service at 800 765 4974 or 937 767 7241 and we ll be happy to help you 2 2 WARRANTY CARD Please complete the Warranty Card and return it to YSI The warranty card allows the entry of your purchase of this instrument in our computer system Once your purchase is recorded you will receive prompt efficient service if any part of your YSI Model 95 needs repair during the warranty period 2 3 BATTERIES There are a few things you must do to prepare your YSI Model 95 for use First locate the six AA sized alkaline batteries that were included Use a screwdriver or a small coin to remove the thumbscrew on the bottom of the instrument see figure below This thumbscrew holds the battery ch
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