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Service Manual - John Morris Scientific

1. ZZ n L C gt erezi 5 a i D I 51 sary a zza mp A 810 eu ti eb NM 610 ti J NW oza 5 sot Lg 89 BEER 013 jie an Lo l 69 ano No En xO o e OR H 90 WAN HH HR s19 Lon LNA glo oun at 42I Y LTH 029 A tout ogy an AR tn IO T x Waele 4 DR 679 Gn E 1 rtd vin t t aw Mi ali W mn 5 um Sid Oy Ra oo ann lo anm BET eur Osito YSI 550A DO Handheld Instrument 21 YSI Incorporated 7 5 CIRCUIT DIAGRAM B S TPS76133DBVT G ii s u2 70ADH002 MLOx2 ae 2 MLOx c2 718 MO hi L1 Lozz ca ot Mi e ATT T 4 10uT KH E Hoy ZEN NC d
2. Figure 2 YSI Incorporated YSI 550A DO Handheld Instrument 9 7 The YSI 559 DO module is shipped dry Before using the YSI 550A with a new YSI 559 sensor the protective membrane on the probe tip must be removed the membrane cap must be filled with electrolyte solution and a new membrane must be installed Follow the instructions below to install the electrolyte solution and membrane CAUTION Make sure that you do not cross thread the screw Use the hex key wrench to tighten the screw in properly making sure that the screw does not stick out on either side of the cable end The probe guard will not thread on properly and damage may result if the screw is allowed to stick out on either side of the cable end YSI Incorporated YSI 550A DO Handheld Instrument 10 SECTION 5 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 100 relative humidity The calibration storage chamber contains a sponge to create a 100 water saturated air environment 5 1 BEFORE YOU CALIBRATE Before you calibrate the YSI550A DO Instrument complete the procedures discussed in Section 2 Preparing the YSI 550A and Section 3 Preparing the Probe You can calibrate the YSI 550A DO Instrument in either mg L or saturation In the section below you will find instructions on how to calibrate and change
3. Weight with Batteries Power Battery life Cables Other Features YSI Incorporated Fresh sea or polluted water Steady state polarographic Field replaceable module 95 of end value in 9 seconds Celsius or Fahrenheit user selectable Automatic temperature compensation for dissolved oxygen Automatic salinity compensation 0 70 ppt for dissolved oxygen Altitude compensation for dissolved oxygen percent calibration 4 7 in width 9 in length 11 9 cm x 22 9 cm 2 lb 0 91 kg 4 alkaline C cells Over 2000 hours at 25 C 77 F 12 25 50 and 100 foot lengths 3 5 7 5 15 30 5 meter lengths Waterproof to IP 67 High impact resistance Push button calibration Built in calibration chamber Large back lit display Low battery indicator on display Manual salinity input CE compliance YSI550A DO Handheld Instrument 5 SECTION 4 PREPARING THE PROBE 4 1 DESCRIPTION The YSI 550A dissolved oxygen probe is a replaceable polarographic sensor designed specifically for the YSI 550A Handheld Dissolved Oxygen System Probe cables are available in lengths of 12 25 50 and 100 feet See Figure 1 STRAIN RELIEF STAINLESS STEEL PROBE BODY PROBE GUARD Figure 1 4 2 CHOOSING THE RIGHT MEMBRANE The YSI 5908 Membrane Kit is supplied with the YSI 550A DO Instrument This kit contains six cap membranes and a bottle of electrolyte solution The 5908 Membrane Kit is the ONLY kit suitable for the 550A 4 3
4. e DO errors caused by temperature measurement errors A maximum 0 2 C temperature error is equal to 0 5 0 04mg L at 25 C TYPE 3 ERRORS e Altitude e Operator Error A 1000 feet error in altitude when calibrating is equal to an error of approximately 3 6 at the 10 mg L level e Instrument Error The maximum DO error caused by calibrating to altitude in increments of 100 feet 0 18 lt 0 015 mg L at 25 C e 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 oc 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 la 1b 2a 2b 3a 3b mg L NOTE This sample calculation is for a near extreme set of conditions YSI Incorporated YSI 550A DO Handheld Instrument 4 SECTION 3 SPECIFICATIONS Display Dissolved O2 mg L 0 01 mg L or 0 1 mg L 0 to 20 mg L 0 3 mg L or 2 of reading whichever is greater user selectable 20 to 50 mg L 6 of reading Dissolved O Yo 0 1 or 1 user selectable whichever is greater Medium Dissolved Oxygen Sensor Dissolved Oxygen Probe Dissolved Oxygen Response Time Temperature Units Parameter Compensation Size
5. Cleaning Agent s used Radioactive Decontamination Certified Answer only if there has been radioactive exposure Cleaning Certified By Name YSI Incorporated YSI 550A DO Handheld Instrument 30 APPENDIXA REQUIRED 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 e re orient the receiving antenna e relocate the YSI Instrument with respect to the receiver e move the YSI Instrument away from the receiver e plug the YSI Instrument 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 2040
6. DO Module 1 Set Screw 4 40x 1 2 long 1 Hex key Wrench 050 DO SENSOR REPLACEMENT Along with the YSI 559 dissolved oxygen module YSI supplies a set screw that holds the sensor in place a hex key wrench to help install the probe and an instruction sheet See Figure 6 1 Remove probe guard IMPORTANT Thoroughly dry the sensor so that no water enters the probe port when the sensor is removed 3 Insert the long end of the hex key wrench into the small hole in the side of the DO sensor module see figure 2 Turn the wrench counter clockwise and remove the screw You do not have to remove the screw all the way to release the sensor 4 Pull the DO sensor out of the module The DO sensor is keyed or has a flat side so that it can not be removed improperly 5 Insert the new probe Make sure that the inside of the module and the o ring of the sensor are clean with no contaminants such as grease dirt or hair The DO sensor is keyed or has a flat side so that it can not be installed improperly 6a IF you did not remove the screw all the way in Step 3 Use the hex key wrench to tighten the screw in properly making sure that the screw does not stick out on either side of the DO sensor module 6b IF you removed the screw all the way in Step 3 Insert the set screw into the small hole in the side of the DO sensor module and turn clockwise to rethread DO Sensor ae Set Screw Hex Key Wrench Cable End gt
7. PROBE PREPARATION The YSI550A DO probe is shipped dry Before using the YSI 550A the protective membrane cap on the probe tip must be removed the new membrane cap must be filled with electrolyte solution and installed Follow the instructions below to replace the membrane cap 4 4 MEMBRANE CAP INSTALLATION To install a new membrane cap on your YSI 550A dissolved oxygen probe 1 Unscrew and remove the probe sensor guard 2 Unscrew and remove the old membrane cap YSI Incorporated YSI 550A DO Handheld Instrument 6 EA Thoroughly rinse the sensor tip with distilled or DI water Prepare the electrolyte according to the directions on the KCI solution bottle Hold the membrane cap and fill it at least 1 2 full with the electrolyte solution Screw the membrane cap onto the probe moderately tight A small amount of electrolyte should overflow Screw the probe sensor guard on moderately tight CAUTION Do not touch the membrane surface 4 5 PROBE OPERATION AND PRECAUTIONS NOTE The YSI 550A DO Instrument should not be used in a purpose other than that specified by YSI Incorporated See Section 9 Warranty and Repair for details 1 It is important to recognize that oxygen dissolved in the sample is consumed during probe operation It is therefore essential that the sample be continuously stirred at the sensor tip If stagnation occurs your readings will be artificially low Stirring may be accomplished by mechanically moving the
8. electrodes and or the thermistor can cause system failure Before using the test below remove the probe s membrane and rinse the electrodes with distilled water Then thoroughly dry the sensor end with compressed air or a soft towel Ohm Meter Lead 1 Ohm Meter Lead 2 Resistance Reading Green silver anode White gold cathode 200 meg ohm or greater YSI Incorporated YSI 550A DO Handheld Instrument 24 Green silver anode Red thermistor 200 meg ohm or greater White gold cathode Red thermistor 200 meg ohm or greater Green White Red Stainless steel probe body 200 meg ohm or greater 8 3 TEST PROCEDURES As stated in the Service Philosophy section of this manual the best way to troubleshoot the Model 550A is by subassembly substitution Below are procedures to test the accuracy and function of the instrument s circuits If any section of the test fails the board assembly or probe will have to be repaired or replaced TEMPERATURE CIRCUIT TEST Disassemble the instrument case by following the Disassembly Procedure section of this manual The temperature circuit can be tested by substituting the probe thermistor at connector J2 pins 4 and 5 with a decade resistance box or by using the DO4 test box Sub for Red and Black probe wires Resistance Input Acceptable J2 Pins 4 amp 5 Displayed Reading 32 66 KQ 1 0 0 C 1 C 10 00 KQ 1 25 0 C 4 1 C 5329 QO 1 40 0 C 1 C 19 90 KQ 1
9. is less than 5 C 23 F or more than 45 C 122 F Increase or decrease the sample temperature to bring within the allowable range Return system for service Return system for service Return system for service YSI Incorporated YSI550A DO Handheld Instrument 14 SECTION 7 DISSASEMBLY ASSEMBLY PROCEDURE Tools Required e Torque screwdriver 6 8 in lbs e Torque wrench 12 in lbs e Torx T15 bit long shank e Phillips screwdriver Due to the YSI 550A s waterproof design it is critical that care be taken during the disassembly and assembly process Refer to Section 7 2 Assembly Drawing while attempting this procedure 7 1 DISASSEMBLY Step 1 Place the instrument face down on a flat cloth covered surface Use a Phillips screwdriver to loosen the 4 battery lid screws Remove the battery lid and 4 C batteries Step 2 With the instrument face down on the flat cloth covered surface remove the 6 6 32 x 1 Torx screws Pull straight up on chamber to separate the case halves TORX screw locations E man Sch Le H K PCB REMOVAL Step 1 The main PC Board is held in place by a single Phillips screw located in the center of the board Remove the screw and gently pull the PC board away from the front case Step 2 Carefully slide the probe connectors out of the mating PCB connector Make note of the YSI Incorporated YSI 550A DO Handheld Instrument 15 wire col
10. 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 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 YSI s 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 YSI Incorporated YSI 550A DO Handheld Instrument 26 AUTHORIZED U S SERVICE CENTERS North Region YSI Incorporated e Repair Center e 1725 Brannum Lane e Yellow Sprin
11. prompt you to enter the approximate salinity of the water you are about to analyze YSI Incorporated YSI 550A DO Handheld Instrument 12 You can enter any number from 0 to 70 parts per thousand PPT of salinity Use the arrow keys to increase or decrease the salinity setting When the correct salinity appears on the LCD zero for fresh water press the ENTER key The instrument will return to normal operation Once the calibration process is complete the only keys that will remain operational are the MODE key the LIGHT key and the ON OFF key You can move back and forth from reading dissolved oxygen in the mg L mode or the air saturation mode by pressing the MODE key If you are working in a dark area and have difficulty reading the LCD press and hold the LIGHT key to activate the back light of the YSI 550A The ON OFF key turns the instrument on or off For best results Each time the YSI550A DO Instrument is turned off re calibrate before taking measurements gt Calibrate at a temperature within 10 C of the sample temperature YSI Incorporated YSI 550A DO Handheld Instrument 13 SECTION 6 TROUBLESHOOTING NOTE An error displayed briefly during the first few seconds after turning the instrument on does NOT indicate a problem SYMPTOM POSSIBLE SOLUTION Instrument will not turn on LCD displays LO BAT or Main display flashes OFF Instrument will not calibrate Instrument locks up Instrument re
12. sample around the probe tip or by rapidly moving the probe through the sample The rate of stirring should be at least 5 foot per second Membrane life depends on usage Membranes will last a long time if installed properly and treated with care Erratic readings are a result of loose wrinkled damaged fouled membranes or from large more than 1 8 diameter bubbles in the electrolyte reservoir If erratic readings or evidence of membrane damage occurs you should replace the membrane and the electrolyte solution The average replacement interval is two to four weeks If the membrane is coated with oxygen consuming e g bacteria or oxygen producing organisms e g algae erroneous readings may occur 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 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 PE Polyethylene acrylic plastic EPR rubber stainless steel epoxy polyetherimide and the PVC cable covering For correct probe operation the gold cathode must always be bright If it is tarnished which can result from contact with certain gases or plated with silver which can result from extended u
13. the only keys that will remain operational are the MODE key the LIGHT key and the ON OFF key You can move back and forth from reading dissolved oxygen in the mg L mode or the air saturation mode by pressing the MODE key If you are working in a dark area and have difficulty reading the LCD press the LIGHT key to activate the back light of the YSI550A The ON OFF key turns the instrument on or off For best results gt Each time the YSI 550A DO Instrument is turned off re calibrate before taking measurements gt Calibrate at a temperature within 10 C of the sample temperature TO CALIBRATE IN SATURATION To switch between mg L and percent saturation to be displayed as the oxygen readings units press the Mode key Either a mg L or will be displayed on the right side of the screen 4 IF you are calibrating in saturation mode the LCD will prompt you to enter the local altitude in hundreds of feet Use the arrow keys to increase or decrease the altitude EXAMPLE Entering the number 12 here indicates 1200 feet J When the proper altitude appears on the LCD press the ENTER key The YSI 550A DO Instrument 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 6 Make sure that the DO reading large display is stable then press the ENTER button The LCD will
14. will need to locate YSI Incorporated YSI 550A DO Handheld Instrument 18 Step 4 Fasten the case halves together using 6ea Torx screws and torque screw driver set to 6 8 in lbs Proper groove in front case M ain case gasket Extra important area Step 5 Install new warranty protection label YSI Incorporated YSI550A DO Handheld Instrument 19 7 3 ASSEMBLY DRAWING Bubble Number Item Number Description 1 115525 Front Cover Assembly W Keypad 2 115524 Display Parts Kit 3 605351 PC Board Assembly W Display 4 115521 Rear Case Assembly 5 115523 Battery Lid Assembly W Screws 6 655148 Probe Storage Chamber 7 055219 Sponge 8 655157 Rubber Plug 9 655155 2 14 20 Phillips Round Machine Screws 10 655152 6 6 32 x 1 Lg Pan Head Torx Screws 11 115158 Cable assembly 12 ft 11 115159 Cable assembly 25 ft 11 115160 Cable assembly 50 ft 11 115161 Cable assembly 100 ft 12 655137 Handstrap Bail 13 655154 4 20 x 44 Lg PCB Screw YSI Incorporated YSI 550A DO Handheld Instrument 20 7 4 BOARD ASSEMBLY FRONT We Do ke Jo cr do GIE 300N NMOQ an Ia IMOd La 624 eza AIR NOU non Ir Usa TOA ug al Jeu ora C EI sa C REAR fa Wes LA Lin gly Oo 1o gt IzZI a UZY 4 t zu
15. 00teeeeoooooeeooooeeooooeenooooeenooooeenoooeeonoooeeenonoeeenoooeeenonoeeenonooeenonoeeenanoeeononoeen 11 SECTION 6 TROUBLESHOOTING eesessesoescesescescescesescescesoecescesceseecoscesceseecescesoesescescesceseesessesoeseessesseseee 14 SECTION 7 DISSASEMBLY ASSEMBLY PROCEDURE csscsssssssssscssscsssssscscssscssscsncessaccsssensees 15 7 1 DISASSEMBLY AEAT EEE EEEE 15 7 2 AS SEMB EY ede see Rete EARE RRR A REO RE E R A ETT 16 7 3 ASSEMBLY DRA WING ENEE AEN EE AEN 20 T 4 BOARD SE E EE 21 7 5 CTRCUIF DIAGRANM ee ee e aie Een Ee pea ra a vap e ee ea senn 22 7 6 CIRCUIT BOARD PARTS LAST ee dk eye tee cececeseceietusucecstuncetstuaecosvtvis evsutuas svietees sa ede saves tosnceesteap cots dodadoes 23 SECTION S TEST PROCEDURES sescsssccsscssscscscssecsscsssossdesssecssesssscseseveseveiedsssiesedsvessvussvescsessiseesevesevdseseieses 24 8 1 SYSTEM FUNCTIONALITY TEST ote oo kenzan iain dees 24 8 2 PROBE R INI EE 24 8 3 TEST PROGEDURES EE 25 SECTION9 WARRANTY AND REPATR 0 0 000e20eeeeeeeeeooeuoeeooouooenoeuooeuooeooeaooeuooeooeuooenooeooeanoeooeooennoeoeoose 26 APPENDIX A REQUIRED NOTICE ee 31 APPENDIX B ACCESSORIES REPLACEMENT PARTS sccsscsssssssssscssccsccssscssscsscssscsscssscescsncesses 32 ii SECTION 1 SERVICE PHILOSOPHY The YSI 550A DO Instrument is sold as a complete dissolved oxygen measuring system including an attached probe and a 12 25 50 or 100 foot cable Most service issues that occur in dissolved oxygen systems
16. 10 0 C 1 C DISSOLVED OXYGEN CIRCUIT TEST Perform this test using a DO4 Test Box or by using a decade resistance box connected to J2 pins 1 amp 2 Sub for Green and White probe wires and input the resistance values in column 2 To begin the test input the resistance value in chart above for 25 0 C and input the resistance of Row 1 Calibrate to 100 0 Salinity set to 0 0 ppt NOTE Last setting is with a temperature resistance value of 10 0 C Input to connector J2 Pins 1 amp 2 to report Mode Mg L Mode 25 0 C 2 04M Q 1 5 5 0 2 0 45 0 02 Mg L 25 0 C 0 0 1 0 0 00 0 1 Mg L 10 0 C 88 2 K Q 40 1 296 4 0 2 33 46 0 02 Mg L YSI Incorporated YSI 550A DO Handheld Instrument 25 SECTION 9 WARRANTY AND REPAIR The YSI 550A DO Instrument is warranted for three years from date of purchase by the end user against defects in materials and workmanship YSI 550A DO 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
17. 2 Stock No 0004 000 00345 4 Note While testing to EN 61000 4 6 Conducted RF Immunity per Table A 1 of EN61326 Electrical Equipment for Measurement Control and Laboratory Use the YSI550A exhibited an ERROR 8 message from 8 6 MHz 22 8 MHz at induced RF voltages of 3 Volts to 1 Volt RMS on the 25 foot probe cable If you observe this interference please relocate the probe cable away from heavy industrial equipment power and control cables or communications equipment cables which may be causing the interference YSI Incorporated YSI 550A DO Handheld Instrument 31 APPENDIX B ACCESSORIES REPLACEMENT PARTS The following parts and accessories are available from YSI or any YSI Authorized Dealer Probe Reconditioning Kit sanding tool and disks for cathode cleaning 5060 Small Carrying Case Soft instrument amp 4M cable 5080 Small Carrying Case Hard Sided instrument amp 4M cable 5081 Large Carrying Case Hard Sided instrument and 20M cable 5065 Form Fitted Carrying Case 5085 Hands Free Harness YSI Incorporated YSI 550A DO Handheld Instrument 32 YSI incorporated 1700 1725 Brannum Lane Yellow Springs Ohio 45387 USA 800 765 4974 937 767 7241 FAX 937 767 1058 Website http www ysi com E mail environmental ysi com
18. 8 2861 e Fax 601 378 2862 Wastewater Q C Services e P O Box 68 e Harrison Maine 04040 e Phone 207 583 2980 Q C Services e P O Box 14831 e Portland Oregon e 97293 e Phone 503 236 2712 North Central Labs e 400 Lyons Road e Birnamwood Wisconsin e Phone 800 648 7836 e Fax 715 449 2454 C B amp S P O Box 556 e Sycamore Illinois e 60178 e Phone 815 895 5158 Fax 815 895 8034 YSI Incorporated YSI 550A DO Handheld Instrument 28 CLEANING INSTRUCTIONS NOTE Before being returned for service 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 step
19. N RT ANGLE CONN 3 PIN RT ANGLE RES 10K 5 1 4W RES 54 9K 1 1 4W RES 100K 1 1 4W RES 10K 1 1 4W RES 1K 1 1 4W RES 15 8K 1 1 4W RES 100K 5 1 4W RES 6 81K 0 190 1 4W RES 220K 5 1 4W RES 127K 1 1 4W RES 1 5K 5 1 4W RES 27 5 1 4W RES 1 2K 5 1 4W RES 402K 1 1 4W RES 205K 1 1 4W RES 450K 1 1 4W RES 249K 1 1 4W RES 357K 1 1 4W RES 68K 5 1 4W RES 1M 5 1 4W RES 10M 5 1 4W RES SIP 100K BEAD FR294366668 1 INDUCTOR 10uH 1 4W INDUCTOR 150uH 1 4W CAPR ELE 100uF 16V CAPR MPE 0 1uF 63V CAPR MPE 0 47uF 63V CAPR ELE 10uF 16V CAPR ELE 2 2uF 16V CAPR CER 100pF 50V CAPR MULTI 0 1uF 50V CAPR MPE 0 33uF 63V CAPR MPE 1uF 63V CAPR CER 20pF 50V CRYSTAL 2 000M Hz TRSTR C945P LC TI TPS76133DBVT LC TLDN TSC7660CPA LC NATL LM385 1 2 LC AMP OP290GP LC NATL CD4053BCN LC AME AME8800AEFT LC TOSH TC4011BP LC TLDN TSC500CPE LC NATL LM358N LC MOTOR MC68HC705C8ACP LC OKI M5265 0082352 B LC EXCL XLS93C46P LC SEIKO S80730AL TACT SW KDTSM62N GS DIODE 1N5817 DIODE 1N4148 LED LAMP HLMP 1540 DIODE 1N60 YSI550A DO Handheld Instrument BEDE ED ESE BR RR RB eB BH HB BREN H rn ENE H H LU Lu ren BEER RR RB eB BR RB RB ENE HR RYE NNR REE EH rn HA N o LA 23 SECTION 8 TEST PROCEDURES 8 1 SYSTEM FUNCTIONALITY TEST The Model 550A can be easily tested using the DO4 Test Box or resistance decade boxes If a test box isn
20. adings are inaccurate Main display reads Over or Undr Main display reads Over or Undr during calibration Secondary display reads Ovr or Undr Main display reads Err and Secondary display reads RO RA or AdC Main display reads Err or burn and Secondary display reads EEP Low battery voltage replace batteries Batteries installed incorrectly check battery polarity Return system for service Replace membrane and electrolyte Clean probe electrodes Return system for service Remove batteries wait 15 seconds for reset replace batteries Replace batteries Return system for service Verify calibration altitude and salinity settings are correct and recalibrate Probe may not have been in 100 water saturated air during calibration procedure Moisten sponge in calibration chamber and recalibrate Replace membrane and electrolyte Recalibrate Clean probe electrodes Return system for service Sample O concentration is more than 60 mg L or 500 or less than 0 02 mg L or 0 3 Verify calibration altitude and salinity settings are correct and recalibrate Replace membrane and electrolyte Recalibrate Clean probe electrodes Return system for service Replace membrane and electrolyte Recalibrate Clean probe electrodes Return system for service Sample temperature
21. are caused by improper maintenance of the probe or cable For this reason troubleshooting efforts should be initially directed at determining the condition and function of the probe and cable In the event that a service problem is isolated to the instrument itself YSI recommends the replacement of the entire defective sub assembly rather than individual components All replacement systems are available through YSI see Section 9 Warranty amp Repair for details SECTION 2 PRINCIPLES OF OPERATION The sensor consists of a silver body as the anode and a circular gold cathode embedded in the end In operation this end of the sensor is filled with a solution of electrolyte containing a small amount of surfactant to improve wetting action A thin semi permeable membrane stretched over the sensor isolates the electrodes from the environment while allowing gases to enter When a polarizing voltage is applied to the sensor electrodes oxygen that has passed through the membrane reacts at the cathode causing a current to flow The membrane passes oxygen at a rate proportional to the pressure difference across it Since oxygen is rapidly consumed at the cathode it can be assumed that the oxygen pressure inside the membrane is zero Hence the force causing the oxygen to diffuse through the membrane is proportional to the partial pressure of oxygen outside the membrane As the oxygen partial pressure varies so does the oxygen diffusion through the me
22. between these modes Note While testing to EN 61000 4 6 Conducted RF Immunity per Table A 1 of EN61326 Electrical Equipment for Measurement Control and Laboratory Use the YSI550A exhibited an ERROR 8 message from 8 6 MHz 22 8 MHz at induced RF voltages of 3 Volts to 1 Volt RMS on the 25 foot probe cable If you observe this interference please relocate the probe cable away from heavy industrial equipment power and control cables or communications equipment cables which may be causing the interference To accurately calibrate the YSI 550A you will need to know the following information The approximate salinity of the water you will be analyzing Fresh water has a salinity of approximately zero Seawater has a salinity of approximately 35 parts per thousand ppt If you are uncertain what the salinity of the sample water use a YSI 30 Salinity Conductivity Temperature instrument to determine salinity gt IF you are going to calibrate in saturation mode you need to know the approximate altitude of the region where you are located 5 2 THE CALIBRATION PROCESS 1 Ensure that the sponge inside the instrument s calibration chamber is moist Insert the probe into the calibration chamber 2 Turn the instrument on by pressing the ON OFF button on the front of the instrument Wait for the dissolved oxygen and temperature readings to stabilize usually 15 minutes is required after turning the instrument on Note You must choose t
23. e Jg Ale v 10K 1 5Vx4 100u GND Chou O 47u AND val 2 Vref C6 H m T Von d T usa 2 2 W MEBBOOAEFT D Y Bto 4 IN OUT 3 pe i F913 020 poor 2s ARE PRIRRARAASH AAS EE RS STITT UIT PIN NO L le oe Dr EE eet LCD1 PIN NO CE 14 PwOU TEOVOTWSL SIOZQOSZH25SBRANwWULHSOQYOT Aaa ge Oh gPOCANRRARRRAGHAHARRRE LY JERS SE 2 5 8 Vref 10K FBI AZ ES i IT OO m R4 um BATS POWER Y2 m 100p a Zu wi D l LI LJ LI 76 LCD1 a ET 1na148 AD3 flea af COMPLY R2 zZ b2 1N4148 2 83 2 A 54 9K Ant s Se D ge Uc 4 Ka cp4011 25220 L 5 R3 Cox Tue BE EE 100k OP290 ou S TANF oon MOT NOSE OPQANRARSNSARSABS BS LCD PIN NO si ou C12 0 33u PODRPSRARAERR BBS BSSSIBSZRBRHAHL LONG UIT PIN NO R715 8K ae J2 4 v ute L2 c13 100p 2 10k g 0P290 1k 100K CATHOD 7 R8 R9 A R6 U48 79 ln L SI OSC2 U11 RE RT LONG p VosAns 4 c15 HD61603 RT LONG P eae ju 20 osc1 gt Eleng Vv Totu R25 Sbaas gp o I N4148x2 vo 357K Ka a0ad gt 10 c26 te ZF 7 18 19 hoje m27 Otu 10uH V 6810 ii R10 100KZ efe CD4053 Tc500 e US u8 V ap oppo S Vint voal SBO730AL MC68HC705A V DB D7 ol li d Po u10 1N4148x2 12 vo Ca Die Pte Jus Vad v 15 0 47u q T4114 100K 16 vad Y li Cint GO RESET RII oe z4 ST pono 3 spe GE See BUF Lk pite ppa D Klee 13 g 0 f 3 Gaz coup 4 4 paz 15 C17 x1 O 1u 13 5 PB3 2 cH 7 B PAG 14 1 Ou YO O 1u c23 a ER 12 6 PB2 Bal Re 6 A PAS 13 Uu ves p Sick a 3 PBI 93046 Zum INH Wiert Mk 35 pB
24. gs Ohio e 45387 e Phone 800 765 4974 e 937 767 7241 E Mail info ysi com Central Region Geotech Environmental Equipment Inc e 8035 East 40 Ave e Denver CO e 80207 Phone 303 320 4764 e Fax 303 322 7242 South Region YSI Environmental Inc e 12231 Industriplex Blvd e Suite A e Baton Rouge LA e 70809 Phone 866 216 2662 e 225 753 2650 Fax 225 753 8669 West Region EQUIPCO Sales and Service e 2100 Meridian Park Blvd e Concord CA e 94520 e Phone 800 550 5875 e Fax 510 674 8655 mann a West YSI Incorporated YSI 550A DO Handheld Instrument 27 INTERNATIONAL AUTHORIZED SERVICE CENTERS YSI Incorporated e Repair Center e 1725 Brannum Lane e Yellow Springs Ohio e 45387 e Phone 937 767 7241 E Mail info ysi com Hoskin Scientific Ltd e 4210 Morris Drive e Burlington ONT L7L 5L6 e Canada e Ph 905 333 5510 e Fax 905 333 4976 e www hoskin ca Hydrodata Services e Unit 8 Business Centre West Avenue One e Letchworth e Herts e SG6 2HB e United Kingdom e Phone 44 1462 673581 e Fax 44 1462 673582 YSI Nanotech e Kaizuka 1 15 4 e Kawasaki Ku Kawasaki City Japan e 210 0014 e Phone 81 4 4 3222 0009 e Fax 81 3 4 4221 1102 e Email Nanotech ysi com SPECIALTY AUTHORIZED SERVICE CENTERS Aquaculture Aquatic Eco Systems Inc e 1767 Benbow Court e Apopka Florida e Phone 407 886 3939 e Fax 407 886 6787 Aquacenter e 166 Seven Oaks Road e Leland Mississippi e 38756 e Phone 601 37
25. mannan YOlincorporated nan jann mant ann EENI on YSI 550A Handheld Dissolved Oxygen and Temperature System Service Manual CONTENTS SECTION SL SERVICE PHILOSOPHY Nee 3 SECTION 2 PRINCIPLES OF OPERATION sccsscsssssssssccsscssscssccscesscssccsscssscsccsscssscsscssscsascsnccsssenssess 3 SECTION 3 SPECIFICATIONS socsccissssesssocsssssvecssosssossdosecsesescobesebedebusetsinscsetessteheseaasebeiusssecebecebasevdstesusesecees 5 SECTION A PREPARING THE PROBE ccccsssssssssssscssccsssccssccssccssscsssscssssccssscesecsosesssssccssscscssossssees 6 4 1 DschRpTOnN 6 4 2 CHOOSING THE RIGHT MEMBRANE ssssesesseessserssserssseessrrerssrerssrerssterssrttesetersstorsstessrtessriersereessreessreeest 6 4 3 PROBE PREPARATION siecccccndecesedacesuscdacevveceuscsncacescenscousecacevuecuesseneecoseceecousecesevveccessvacecusccnecoveececevuecsesesnees 6 4 4 MEMBRANE CAPINSTALEA TION akne tek da kn dv ke kad ee ka kak ko aka aa e eas bu vese tava 6 4 5 PROBE OPERATION AND DRPCAUTIONS 7 4 6 PROBE MAINTENANCE deene dee pe adan se cues Road ave EES 8 4 7 HOW TO REPLACE THE DO PROBE TIP 020000Ltteeeeeetooeovseoooeuseooeeuseooeeuneooeeusoooeeuoooeennoooeennoooeenooeeennoooeennose 9 SECTION 5 CALIBRATION vicscicssscccsscsssssscssscscsessssesedecstesesesevesuvessceeteveseveiedesevedecebssedecsvesedessdcsededessvedesessess 11 5 1 BEFORE YOU CALIBRATE osc i a a a a r a a a e a eaa aa 11 5 2 THE CALIBRATION PROCESS 0L
26. mbrane This causes the probe current to change proportionally It is important to recognize that oxygen dissolved in the sample is consumed during the test It is therefore essential that the sample be continuously stirred at the sensor tip If stagnation occurs your readings will be artificially low Stirring may be accomplished by mechanically moving the sample around the probe tip or by rapidly moving the probe through the sample The rate of stirring should be at least 0 5 foot per second 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 instrument 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 YSI Incorporated YSI 550A DO Handheld Instrument 3 TYPE 1 ERRORS e Instrument linearity error 1 of full scale reading or 0 15 mg L e Component and circuitry error 0 05 mg L TYPE 2 ERRORS e DOerrors caused by temperature compensation for measurements at 10 C from calibration temperature 1 0 08 mg L at 25 C
27. mical or mechanical e Chemical cleaning Remove the membrane cap and soak the entire anode section in a 14 ammonium hydroxide solution for 2 to 3 minutes followed by a thorough rinsing with distilled or deionize water The anode should then be thoroughly wiped with a wet paper towel to remove the residual layer from the anode e Mechanical cleaning Sand off the dark layer from the silver anode with 400 grit wet dry sandpaper Wrap the wet sandpaper around the anode and twist the probe Rinse the anode with clean water after sanding followed by wiping thoroughly with a wet paper towel GOLD CATHODE For correct probe operation the gold cathode must be textured properly It can become tarnished or plated with silver after extended use The gold cathode can be cleaned by using the adhesive backed sanding disc and tool provided in the YSI 5238 Probe Reconditioning Kit Using the sanding paper provided in the YSI 5238 Probe Reconditioning Kit wet sand the gold with a twisting motion about 3 times or until all silver deposits are removed and the gold appears to have a matte finish If the cathode remains tarnished return the probe for service Wipe the gold cathode thoroughly with a wet paper towel before putting on a new membrane cap YSI Incorporated YSI 550A DO Handheld Instrument 8 4 7 HOW TO REPLACE THE DO PROBE TIP The YSI 559 Replaceable DO Module Kit includes Quantity Item 1 Instruction Sheet 1 Sensor
28. o 12 U12 371 Noa Vs AGN A la pa2 H2 BK Hes Vee 8_ oy Vv oT V COMPLY PAS PAI 7 R26 z SK 028 7 11 7 PAO DI 0 1u Voom yee A PA4 4 5 pIe V 28 R27 a ae l 0 1u 7 Peo sel 100k iM E LSD las 18 30 st V SUPPRESS 77 PB6 PDI TX 29 MCU Tx HLMP 1540x6 l PB6 at Di PDO RX MCU Rx a D F H 18 a 9 GND 100K Yt P RN1 4 SA bb dA Ta wd THH pg pioj ni Diz mi Gi Wen 2 t D17 D22 27 PCI IRQ 3 4 5 6 7 g L 20 yss Bay y E 6945 R18 zl p07 Z a SWI ON OFF 25 pcs pps 34 D23 iNeop 0666 16666 MW up 26 aco pa i Lt LI SM DOWN I pps 32 CC LL SWE MODE l L a ese id C SWS ENTER took t PC6 pcs 23 SWS LIGHT Vret BIS A 3 8 0 1V LM358 osc2 28 29 izi 1 LOW BATTERY DETECT Vref le L R30 20P R20 U9A 100K T Ze 39 OM SS 12 Bure 7 oscip To d L 402K 2 Dis gt DN C30 LM358 R23 3 6 0 1V 2M Hz 20p L R21 450K 3R24 205K 248k YSI Incorporated YSI 550A DO Handheld Instrument 22 7 6 CIRCUIT BOARD PARTS LIST CIRCUIT SYMBOL DESCRIPTION QTY JI JI J2 J3 J4 RI R2 R3 R4 R6 RS R8 R7 R9 R11 R12 R19 R22 R27 R29 R10 R13 R14 R15 R18 R16 R17 R20 R21 R23 R24 R25 R26 R28 R30 RN LI L2 L3 L4 L6 L5 C1 C3 C6 C2 C10 C11 C22 C23 C4 C21 C5 C19 C7 C8 C13 C9 C14 C16 C18 C20 C24 C28 C12 C15 C17 C29 C30 X1 Q1 Q2 1 GJ Ch E VON 9 10 11 12 13 SW1 SW6 DI D2 D8 D17 D22 D9 D14 D23 Chee GEC EOC e GG YSI Incorporated CONN 70ADH002 MLO CONN 5 PI
29. o calibrate in mg L or saturation mode Once you are in the calibration menu you can switch between saturation and mg L To switch between mg L and saturation to be displayed as the oxygen readings units press the Mode key Either a mg L or will be displayed on the right side of the screen YSI Incorporated YSI 550A DO Handheld Instrument 11 3 To enter the calibration menu use two fingers to press and release both the UP ARROW and DOWN ARROW keys at the same time TO CALIBRATE IN MG L Place the probe in solution with a known mg L reading You must agitate or stir the probe with a rate of at least 5 foot per second during the entire calibration process 4 Make sure that the DO reading large display is stable then press the ENTER button The YSI550A DO instrument should now display CAL in the lower left of the display and the current DO reading before calibration should be on the main display 5 Using the up and down arrow keys select the mg L value of the known solution then press the ENTER button The LCD will prompt you to enter the approximate salinity of the water you are about to analyze You can enter any number from 0 to 70 parts per thousand PPT of salinity Use the arrow keys to increase or decrease the salinity setting When the correct salinity appears on the LCD zero for fresh water press the ENTER key The instrument will return to normal operation Once the calibration process is complete
30. or configuration so that the connectors can be correctly re installed later PROBE CABLE REMOVAL Step 1 To separate the probe cable from the front case unscrew the outer portion of the strain relief that portion which does not make contact with the case Slide the spiral portion of the strain relief down the cable toward the probe Next unscrew the remaining portion of the strain relief from the front case and pull the wires and connectors through the threaded hole LCD REMOVAL Step 1 To separate the LCD assembly from the main PC Board remove the four Phillips mounting screws 7 2 ASSEMBLY PROBE CABLE INSTALLATION Step 1 Feed the cable through the threaded hole in the strain relief adapter Attach the amp connectors of the cable to the 550A Board Assembly Double check the wire colors Be sure the connectors are completely installed they should not stick out past the PCB edge Step 2 Hold the cable so that its outer jacket is visible inside the case Thread the strain relief main nut into the adapter Hand tighten then torque to 12 in lbs Step 3 Hold the cable with one hand Use the other hand to thread the relief nut onto the back of the main nut Hand tighten then torque to 12 in lbs YSI Incorporated YSI550A DO Handheld Instrument 16 Outer jacket visible PCB REPLACEMENT INSTALLATION Step 1 Position the PCB onto the rear case locating posts The case center mounting hole should be vi
31. s 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 isopropyl alcohol or a solution of 1 4 cup bleach to 1 gallon tap water are suitable for most disinfecting Instruments used with wastewater 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 is 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 Use a large carton preferably the original and surround the product completely with packing material 5 Insure for the replacement value of the product E UN ma YSI Incorporated YSI 550A DO Handheld Instrument 29 Cleaning Certificate Organization Department Address City _ Zip Country Model No ofDevice Lot Number Contaminant if known
32. se with a loose or wrinkled membrane the gold surface must be restored To restore the cathode you may either return the instrument to the factory or clean it using the sanding disk in the YSI 5238 Probe Reconditioning Kit Never use chemicals or abrasives not supplied with this kit YSI Incorporated YSI 550A DO Handheld Instrument 7 7 Itis also possible for the silver anode which is the entire silver body of the probe to become contaminated which will prevent successful calibration To clean the anode follow the Anode cleaning instructions in the following section Next rinse the sensor tip and Electrolyte reservoir with deionize water add new Electrolyte solution and install a new membrane and O ring Turn the instrument on and allow the system to stabilize for at least 30 minutes If after several hours you are still unable to calibrate return the YSI 550A DO Instrument to a YSI authorized service center for service See Section 9 Warranty and Repair for more information 8 To keep the electrolyte from drying out store the probe in the calibration storage chamber with the wet sponge 4 6 PROBE MAINTENANCE ELECTRODE CLEANING It is always a good practice to keep the probe in good operating condition SILVER ANODE After extended use a thick layer of AgCI builds up on the silver anode reducing the sensitivity of the sensor The anode must be cleaned to remove this layer and restore proper performance The cleaning can be che
33. sible through the center hole in the PCB Fasten the PCB to the case using screw 655154 Center hole in PCB under screw 655154 Step 2 Remove the protective film from the PCB display and discard Step 3 Install the display shock mount onto the PCB display Locate the ribs on the under side of the shock mount one on each short edge Be sure the ribs engage the slots on either side of the clear plastic display retainer Silver strip SE film to be Protective Slotin clear plastic retainer removed YSI Incorporated YSI 550A DO Handheld Instrument 17 CASE ASSEMBLY A Whenever the YSI 550A s case is opened 1 All gaskets and seals need to be clean and free of dirt or dust 2 Proper torque specs must be followed to ensure a watertight seal Step 1 Verify that the 6ea Mounting hole gaskets and 2ea PCB Backer shock mounts are in place Step 2 Inspect the lens on the front cover display lens and gaskets and be certain they are free from dust or lint 6 M ounting hole gaskets 2 PCB Backer shock mounts A Be sure all gaskets are clean before proceeding Debris on the gaskets could cause the case to leak Step 3 Double check the main case gasket for proper seating and then Shock mount installs with M ounting hole gasket the bails in the installs with its lip at the proper holes on the mate the rear case rear case as you mate the cases assembly to the front case You
34. t available the following quick test can be used to verify the system s operation If necessary service the probe s electrodes Install a fresh membrane and probe solution Place the probe in its calibration chamber Turn the system on and allow it to stabilize for 15 30 minutes Calibrate the system as described in the Calibration section of this manual With the probe in the calibration chamber check the displayed reading for stability Erratic or drifting readings indicate a possible problem See the Troubleshooting section for help 6 Place the probe in a zero oxygen environment The display should decrease rapidly and reach 0 2 in 5 minutes or less Gio oN a A zero oxygen environment can be obtained by taking a reading in pure nitrogen gas or in a sodium sulfite solution It can also be obtained in a BOD bottle filled with 350 mL of distilled water in which 3 to 7 grams of active dry yeast has been dissolved and allowed to consume the oxygen about 5 minutes 8 2 PROBE TEST The probe thermistor can be tested by measuring its resistance in a temperature controlled bath and comparing the reading to the chart below With the probe disconnected from the instrument connect a precision ohm meter to the Red and Black probe wires All readings are 10 ohms Bath temperature Resistance in Celsius Ohms 0 32 66 K 10 19 90 K 25 10 00 K 40 5329 0 Electrical leakage between the sensor

Service Manual - John Morris Scientific

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