YSI Model 30 Salinity, Conductivity and
Contents
1. A measurement of the conductive material in the liquid sample without regard to temperature gt Specific Conductance Also known as temperature compensated conductivity which automatically adjusts the reading to a calculated value which would have been read if the sample had been at 25 C or some other reference temperature which you choose See Advanced Setup gt Salinity A calculation done by the instrument electronics based upon the conductivity and temperature readings NOTE When you turn the Model 30 off it will remember which mode you used last and will return to that mode the next time the instrument is turned on YSI Incorporated Model 30 5 To choose one of the measurement modes above temperature is always displayed simply press and release the key carefully observe the small legends at the far right side of the LCD MOD E If the instrument is reading Specific Conductance the large numbers on the display 3j 1 will be followed by either a HS or an mS e H S Additionally the small portion of the display will show the C flashing on and off If the instrument is reading Conductivity the large numbers on the display will be followed by 23 4 C either a uS or an mS Additionally the small portion of the display will show the C NOT flashing If the instrument is reading Salinity the large numbers on the display will be followed by a ppt AUTORANGING amp RANGE SEARCHING The YSI Model 32. 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 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 i 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 FO
3. Schematics are representative The actual circuit may vary slightly YSI Incorporated Model 30 22 8 4 FEATURE CUSTOMIZATION Non CE Model 30 boards can be setup to display temperature in degrees Fahrenheit or Celsius by moving a single jumper This applies to Non CE boards only Note To customize a Model 30 the rear cover will have removed and the printed circuit board exposed For this reason a qualified service technician should perform this procedure Jumper used to change temperature from C to F When the jumper is plugged into the right 2 pins temperature will display in C When the jumper is plugged into the left 2 pins temperature will display in F NOTE FIGURE SHOWN IN DEGREES FAHRENHEIGHT MODE Exposed side of printed circuit board when rear cover is removed YSI Incorporated Model 30 23 APPENDIX A PARTS LIST BOARD COMPONENTS Circuit Symbol IPI JP2 JP3 P4 PS P6 Circuit Symbol Res SIP 100K C1 C2 C8 C11 C17 Capr MPE 0 1uF 63V C24 C25 Capr MPE 0 1uF 63V C3 C4 C12 C15 C16 Capr Multi 0 1 uF 50V C5 C29 C31 Capr Cer 20pF Conn 3 Pin Wafer R1 R2 R26 R44 Res 100K 5 C26 C27 C28 C32 C33 Capr Multi 0 1 uF 50V C6 C9 MPE luF 63V R Re3K 5 O R4 R12 R13 R16 R17 5 i Capr PSI 470pF 50V Res 237 196 Capr MPE 22uF 63V Capr MPE 33uF 63V R9 R10 R 20 Res 562K 196 D1 D8 D11 Diode 1N4148 R11 Res 100 5 i R14 15 35 Res 10M
4. 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 8cmW x 3 8cmL Power 9 VDC 6 AA size Alkaline Batteries included Approximately 180 hours operation from each new set of batteries Water Tightness Meets or exceeds IP65 standards Extensive testing of the YSI Model 30 indicates the following typical performance MEASUREMENT RANGE RESOLUTION ACCURACY Conductivity 0 to 499 9 uS cm 0 1 uS cm 5 FS 0 to 4999 uS cm 1 0 uS cm 5 FS 0 to 49 99 mS cm 01 mS cm 5 FS 0 to 200 0 mS cm 0 1 mS cm 5 FS Salinity 0 80 ppt ppt 2 or O 1ppt Temperature 5 to 959 C 0 19 C 0 19 C Ilsd 23 to 203 OF C is factory default non CE units can be modified to read in F see section 8 4 Feature Customization Adjustable Reference Temperature 150 C 259 C YSI Incorporated Model 30 2 Adjustable Temperature Compensation Factor 0 4 Temperature Compensation Automatic Range User selected or Autoranging 1 3 PRINCIPLES OF OPERATION The Model 30 utilizes a cell with four pure nickel electrodes for the measurement of solution conductance Two of the electrodes are current driven and two are used to measure the voltage drop The measured voltage drop is then converted into a conductance value in milli Siemens millimhos To convert this value to a conductivity specific conductance value in milliSiemens per cm mS cm the conduc
5. display for a second to indicate that your change has been accepted 7 Press the MODE key to return to normal operation the CAL symbol will disappear from the display YSI Incorporated Model 30 7 CHANGING THE REFERENCE TEMPERATURE Follow these steps to modify the reference temperature of the Model 30 1 Turn the instrument and wait for it to complete its self test procedure 1 Press and release these two keys at the same time Y MODE 3 The CAL symbol will appear at the bottom left of the display 4 helarge portion of the display will show 1 91 96 or a value set previously using Advanced Setup 5 Press and release the MODE key the large portion of the display will show 25 0C value set previously using Advanced Setup 6 Use the up or down arrow keys to change the value to the desired new reference temperature any value between 15 C and 25 C is acceptable 7 Press the ENTER key The word SAVE will flash across the display for a second to indicate that your change has been accepted 8 The instrument will automatically return to normal operation mode CHANGING FROM AUTORANGING TO MANUAL RANGING If your application is easier to perform using a manual range that you select the YSI Model 30 allows you to turn off the default autoranging feature While you are making conductivity or temperature compensated conductivity measurements simply press and release the ENTER key Each additional press of
6. 0 is an autoranging instrument This means that regardless of the conductivity or salinity of the solution within the specifications of the instrument all you need to do to get the most accurate reading is to put the probe in the sample When you first place the Model 30 probe into a sample or calibration solution and again when you first remove the probe the instrument will go into a range search mode that may take as long as 5 seconds During some range searches the instrument display will flash rANG to indicate its movement from one range to another In addition the instrument may appear to freeze on a given reading for a few seconds then once the range is located will pinpoint the exact reading on the display DURING MEASUREMENT OPERATION While the instrument is in normal operation mode and you are making measurements only those keys described above have a defined function The following keys have no function A Y During normal operation the ENTER key enables and disables the autoranging feature of the instrument We recommend that the instrument always be operated using the autoranging feature See Advanced Setup if you need to switch to manual ranging YSI Incorporated Model 30 6 2 1 ADVANCED SETUP The default settings of the YSI Model 30 are appropriate for the vast majority of measurement applications However some measurement applications require very specific measurement criteria For that reason we have made the YSI Mod
7. 00 1 150 0 mS 147 2 to 152 8 mS 111100 10 00 1 45 00 mS 44 37 to 45 65 mS 1111 0 Q 10 00 KQ 1 4 500 mS 4442 to 4560 uS 11 11 KQ 10 00 KQ 1 450 0 uS 450 0 uS YSI Incorporated Model 30 13 Temperature Test Chart 2 Pinout JP1 Nominal Reading Acceptable Reading ES GE 32 66 1 0 0 1 C w 10 00 KO 1 25 0 C 25 0 1 C 5329 Q 1 40 0 C 40 0 1 C DI D2 RTI 1752 Q 196 70 0 70 0 1 FCB End Bottom SECTION6 SYSTEM CALIBRATION BEFORE YOU CALIBRATE Important System calibration is rarely required because of the factory calibration of the YSI Model 30 However after service is performed you should check the system calibration and make adjustments when necessary To accurately calibrate the YSI Model 30 it is important to remember the following 1 Always use clean properly stored NIST traceable calibration solutions When filling the clean calibration container prior to performing the calibration procedures make certain that the level of calibrator buffers is high enough in the container to cover the entire conductivity cell Gently agitate the probe to remove any bubbles in the conductivity cell 2 Rinse the probe with deionized water and wipe dry between changes of calibration solutions 3 During calibration allow the probe time to stabilize with regard to temperature approximately 60 seconds before proceeding with the calibration process The readings
8. 00000 8 possess 0600 Bbsososo pese 90009 TEMCUNH o QI o ppoaonoak 90909099 64604606006 90 oo lol ogg g a oo e o SEH oj Gee o20o002o0oo0o 2009 9090909 a lo C icc 3 aie qo oj o eL In epee o600000009020l o onao 0000 Do KEYPAD BOARD LCD DISPLAY BOARD Drawings are representative The actual layout may vary slightly 20 Model 30 YSI Incorporated 8 3 CIRCUIT DIAGRAMS MAIN PC BOARD V eu 5 1 bas vro s PROSE Schematics are representative The actual circuit may vary slightly YSI Incorporated Model 30 21 LCD BOARD z a d 4 BL B IP2222222083333333P44444444P E ND iy OES FAB 02 AEGFABCO JEF amar m V TrM y We aw o Beale Ba RS SOSH RN AN eR KEYPAD BOARD PROBE CONNECTOR WIRING 1 1 1 1 1 1 1 1 1 1 ON OFF WIRE ELECTRODE OR COLOR THERMISTOR BACKLIGHT WHITE GREEN 1 SENSE ur WHITE D2 DRIVE BROWN BLACK 52 SENSE BLUE THERMISTOR DOWN BROWN THERMISTOR i BLUE GREEN MADE BLACK ENTER i CUNNECTQR WIRING CABLE END 1 1
9. 5 e Tlx 858210 YSI Japan e Sakura Building 6 5 6 13 Shinjuku Shinjuku ku Tokyo 160 Phone 81 3 5360 3561 Fax 81 3 5360 3565 SPECIALTY SERVICE CENTERS Aquaculture Aquatic Eco Systems Inc 1767 Benbow Court Apopka Florida Phone 407 886 3939 e Fax 407 886 6787 Aquacenter 166 Seven Oaks Road Leland Mississippi 38756 e Phone 601 378 2861 Fax 601 378 2862 Wastewater Services P O Box 68 Harrison 04040 e Phone 207 583 2980 Services P O Box 14831 e Portland Oregon e 97293 e Phone 503 236 2712 North Central Labs 400 Lyons Road Birnamwood Wisconsin Phone 800 648 7836 e Fax 715 449 24 YSI Incorporated Model 30 27 YSI incorporated 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 info ysi com Item 030132 Drawing A30132 Revision C September 1998
10. R 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 WQ AUTHORIZED U S SERVICE CENTERS North Region YSI Incorporated e Repair Center 1725 Brannum Lane e Yellow Springs Ohio 45387 e Phone 800 765 4974 e 937 767 7241 E Mail info ysi com South Region Lynch amp Associates 212 E 2nd Street e Suite 203 e Pass Christian Mississippi 39571 e Phone 800 333 2252 228 452 4612 Fax 228 452 2563 West Region EnviroServices amp Repair 1110 Burnett Avenue Suite D e Concord CA e 94520 e Phone 800 550 5875 Fax 510 674 8655 Central Region HydroTech Services LLC e 4910 Iris Street Wheat Ridge COe 80033 e Phone 877 467 0800 e Fax 303 467 0742 E Mail 100735 423 compuserve com YSI Incorporated Model 30 26 Central North Dalota West ia E Maryland 7 Tenzasse 77 North E Em s 2 V lippi amlina 280798 we Florida Nebraska South Dalota j i New Hampshire k INTERNATIONAL SERVICE CENTERS YSI Incorporated Repair Center 1725 Brannum Lane Yellow Springs Ohio 45387 e Phone 937 767 7241 E Mail info ysi com YSI Limited Lynchford House Lynchford Lane Farnborough e Hampshire e GU146LT e Phone 44 1252 514711 e Fax 44 1252 51185
11. YSI incorporated YSI Model 30 Salinity Conductivity and Temperature System Service Manual TABLE OF CONTENTS Section 1 General Description 1 1 1 Service Philosophy 1 2 Specifications 1 3 Principles of Operation Section 2 Making Measurements 2 1 Advanced Setup Section 3 Measurement Errors Section 4 Maintenance Section 5 Instrument Test Procedure Section 6 System Calibration Section 7 Troubleshooting Section 8 Disassembly Procedures 8 1 Assembly Drawing 8 2 Board Assemblies 8 3 Circuit Diagrams 8 4 Feature Customization Appendix A Parts List Board Components Appendix B Accessories amp Replacement Parts Appendix C Warranty and Repair 10 12 13 15 16 17 18 19 21 22 23 24 H SECTION 1 GENERAL DESCRIPTION The YSI Model 30 Handheld Salinity Conductivity and Temperature System is a rugged micro processor based digital meter with an attached YSI four electrode conductivity cell The YSI Model 30 is designed for use in field lab and process control applications and is available with cable lengths of 10 25 or 50 feet The body of the probe has been manufactured with stainless steel to add rugged durability and sinking weight The large liquid crystal display LCD is easy to read and is equipped with a back light for use in dark or poorly lighted areas The Model 30 s micro processor allows the system to be easily calibrated with the press of a few buttons Additionally the micro proces
12. after calibration are only as good as the calibration itself 4 Perform sensor calibration at a temperature as close to 25 C as possible This will minimize any temperature compensation error THE CALIBRATION PROCESS System calibration is rarely required because of the factory calibration of the YSI Model 30 However from time to time it is wise to check the system calibration and make adjustments when necessary Follow these steps to perform an accurate calibration of the YSI Model 30 1 Turn the instrument on and allow it to complete its self test procedure 2 Select a calibration solution which is most similar to the sample you will be measuring e For sea water choose 50mS cm conductivity standard YSI Catalog 3169 e For fresh water choose a 1mS cm conductivity standard YSI Catalog 3167 YSI Incorporated Model 30 14 e For brackish water choose a 10mS cm conductivity standard YSI Catalog 3168 3 Place at least 3 inches of solution in a clean glass beaker 4 Insert the probe into the beaker deep enough to completely cover the oval shaped hole on the side of the probe Do not rest the probe on the bottom of the container suspend it above the bottom at least 1 4 inch 5 Allow at least 60 seconds for the temperature reading to become stable 6 Move the probe vigorously from side to side to dislodge any air bubbles from the electrodes 7 Press and release these two keys at the same time A Y The CAL symbol will
13. appear at the bottom left of the display to indicate that the instrument is now in Calibration mode 10 00 24 8 c CAL 8 Use the up or down arrow key to adjust the reading on the display until it matches the value of the calibration solution you are using Once the display reads the exact value of the calibration solution being used the instrument will make the appropriate compensation for temperature variation from 25 C press the ENTER key once The word SAVE will flash across the display for a second indicating that the calibration has been accepted Note You must press the up or down arrow key during the calibration process or an error message will appear on the display If this occurs turn the instrument off and back on and begin the calibration procedure again Also see Section 7 Troubleshooting The YSI Model 30 is designed to retain its last calibration permanently Therefore there is no need to calibrate the instrument after battery changes or power down YSI Incorporated Model 30 15 E See Taking Measurements Section 5 Main Display reads A Conductivity Reading is gt 200 mS A E In all cases check calibration values and OVEr B Temp Reading is gt 95 C procedure check Advanced Setup settings If each of C Temp Reading is lt 5 C these is set correctly troubleshoot or return system D Salinity reading is gt 80ppt for service E User cell constant cal is gt K 5 25 Troubleshoot replace ce
14. ctivity data in either raw or temperature compensated form If Conductivity is selected values of conductivity that are NOT compensated for temperature are output to the display If Specific Conductance is selected the Model 30 uses the temperature and raw conductivity values associated with each determination to generate a specific conductance value compensated to a user selected reference temperature see Section 2 1 Advanced Setup between 15 C and 25 C Additionally the user can select any temperature coefficient from 0 to 4 Using the Model 30 default reference temperature and temperature coefficient 25 C and 1 91 the calculation is carried out as in equation 1 below Specific Conductance 25 C Conductivity 1 4 TC T 25 As noted above unless the solution being measured consists of pure KCl in water this temperature compensated value will be somewhat inaccurate but the equation with a value of TC YSI Incorporated Model 30 3 0 0191 will provide a close approximation for solutions of many common salts such as NaCl and NHA4CI and for seawater YSI Incorporated Model 30 4 SECTION 2 MAKING MEASUREMENTS The YSI Model 30 is factory calibrated This means that once you have put batteries in the instrument you are ready to begin taking readings immediately TURNING THE INSTRUMENT ON Once the batteries are installed correctly turn the instrument face up and ON OF press The instrument will activate all seg
15. d is the worst case instrument error Cell Constant Error 5 maximum Although YSI cells are warranted to be accurate to within one percent you should still determine the exact cell constant of your particular cell Contamination or physical damage to the cell can alter the cell constant Performing a calibration will eliminate any error that might arise because of cell constant change YSI cells are calibrated to within one percent of the stated cell constant at a single point We consider these products to be usefully linear over most instrument ranges The cell constant can be calibrated to 0 35 accuracy with YSI conductivity calibrator solutions Temperature Error 1 maximum The solution temperature error is the product of the temperature coefficient and the temperature offset from 25 C expressed as a percentage of the reading that would have been obtained at The error is not necessarily a linear function of temperature The statement of error is derived from a 25 C temperature offset and a 3 C temperature coefficient Total Error Considering only the above three factors system accuracy under worst case conditions will be 2 although the actual error will be considerably less if recommended and properly calibrated cells and instrument ranges are used Additional errors which can essentially be eliminated with proper handling are described below YSI Incorporated Model 30 9 Cell Contamination This error is usuall
16. deionized or clean tap water 4 Store the conductivity cell in the meter storage chamber PROBE PRECAUTIONS Observe the following precautions to ensure accurate repeatable results 1 The cell must be clean before making any measurements When working with substances having low conductivity extraordinary cleanliness may be required 2 Suspend the cell in the solution deep enough to submerge the vent hole The electrode chamber should be free of trapped air You may need to tap the probe gently to dislodge any air bubbles YSI Incorporated Model 30 11 3 Ideally the cell should be at least inch away from any other object including the sides or bottom of the solution container 4 Stirring may be necessary for highest accuracy measurements especially in low conductivity solutions 5 If possible isolate from ground potential the container or system in which measurements are to be made 6 Hlectrical fields and stray currents caused by stirrer motors heaters etc can interfere with measurements The user should determine the effects of these and make the necessary corrections either by shielding or by disconnecting those units that cause trouble 7 Always rinse the cell carefully before transferring it from one solution to another Never store a dirty or contaminated cell YSI Incorporated Model 30 12 SECTION 5 INSTRUMENT TEST PROCEDURE As stated in Section 1 1 Service Philosophy the easiest way to troubleshoo
17. eg 1 D9 D10 Zener Diode 7 5V R18 Res 3 92K 1 i D12 D13 Diode 1N4148 Capr Multi 47uF 50V Capr Ele 22uF 16V Capr Ele 10uF 16V 2 l 214 219 LED HLMP 1540 ULC LTC1043CN 2 Res 10K 1 3 Res 4 22K 1 5 Res 1 50K 1 U LC LF444CN L C CD4052BCN U LC OPI77GP 7 Res 220K 5 LC CD4066BE R28 Res 845K 1 L C CD4053BE R29 Res 232K 1 LC S81250HG LC TC4011BP LC 7663ACPA Res 28 7K 196 R30 R36 Res 15 0K 196 R31 Res 120K 196 R32 Res 499K 196 LC TC7660CPA R33 Res 301K 1 LC TC7660CPA R34 Res 280K 1 37 Res 357K 1 LC DC8069 R38 Res 15K 5 Crystal 4 0M Hz R3 R R41 R R19 24 Res 1 0K 1 YSI Incorporated Model 30 24 APPENDIX B ACCESSORIES AND REPLACEMENT PARTS The following parts and accessories are available from YSI Customer Service or authorized YSI Dealer Number Conductivity Calibration Solution 10 000 u cm 1 Quart Board Assembly 30 Without Display CE Units Electrode Cleaning Brush Please note Only parts with a YSI order number are available from YSI YSI Incorporated Model 30 25 APPENDIX C WARRANTY AND REPAIR YSI Model 30 Handheld Meters are warranted for two years from date of purchase by the end user against defects in materials and workmanship YSI Model 30 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
18. el 30 flexible to accommodate these advanced users If for example you are using the YSI Model 30 for a process control application that requires that the conductivity readings be compensated to 20 C instead of 25 C this is the section to read Or if your application for the YSI Model 30 involves the salinity measurement of a very specific saline solution the default temperature coefficient may need to be changed to get the very best measurement of that specific salt Important There is never a need to enter Advanced Setup Mode unless your special measurement application calls for a change in reference temperature and or temperature coefficient Therefore unless you are certain that your application requires a change to one or both of these criteria do not modify the default reference temperature 25 C or the default temperature coefficient 1 91 CHANGING THE TEMPERATURE COEFFICIENT Follow these steps to modify the temperature coefficient of the Model 30 1 the instrument on and wait for it to complete its self test procedure 1 Press and release these two keys at the same time Y MODE 3 The CAL symbol will appear at the bottom left of the display 4 helarge portion of the display will show 1 91 96 or a value set previously using Advanced Setup 5 Use the up or down arrow keys to change the value to the desired new temperature coefficient 6 Press the ENTER key The word SAVE will flash across the
19. erally completely masked by the error budget for cell constant calibration instrument accuracy etc Examples range from parasitic reactances associated with the solution container and its proximity to external objects to the minor galvanic effects resulting from oxide formation or deposition on electrodes Only trial and error in the actual measurement environment can be suggested as an approach to reduce such errors If the reading does not change as the setup is adjusted errors due to such factors can be considered too small to see YSI Incorporated Model 30 10 SECTION 4 MAINTENANCE CLEANING AND STORAGE The single most important requirement for accurate and reproducible results in conductivity measurement is a clean cell A dirty cell will change the conductivity of a solution by contaminating it Note ALWAYS RINSE THE CONDUCTIVITY CELL WITH CLEAN WATER AFTER EACH USE To clean the conductivity cell 1 Dip the cell in cleaning solution and agitate for two to three minutes Any one of the foaming acid tile cleaners such as Dow Chemical Bathroom Cleaner will clean the cell adequately When a stronger cleaning preparation is required use a solution of 1 1 isopropyl alcohol and 10N Remove the cell from the cleaning solution 2 Use the nylon brush supplied to dislodge any contaminants from inside the electrode chamber 3 Repeat steps one and two until the cell is completely clean Rinse the cell thoroughly in
20. hich does not make contact with the front 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 STEP 7 To separate the LCD from the main PC Board squeeze the four plastic off set spacers and slide the LCD PC board away from the main board one corner at a time Next remove the four small Phillips screws from the back of the LCD and remove the LCD from its clear plastic frame STEP 8 To remove the keypad from the front case use a small Phillips screwdriver to remove the screws from the keypad s metal backplate then lift the keypad away from the front case YSI Incorporated Model 30 18 8 1 ASSEMBLY DRAWING Bubble 1 YSI Order Number 030131 Description Front Case Assembly W Keypad 2 2 gt O 6 030133 030156 030898 055242 055204 055244 110030 110031 110032 Board Assembly 30 With Display Non CE Units Board Assembly 30 Without Display CE Units Board Assembly Display 30 CE Boards Rear Case Assembly Kit Case Hardware Kit Battery Hardware Probe amp Cable Assembly 10 feet Probe amp Cable Assembly 25 feet Probe amp Cable Assembly 50 feet Use on Non CE Instruments A jumper on 030156 board may need to be moved Contact YSI YSI Incorporated Model 30 19 8 2 BOARD ASSEMBLIES MAIN PC BOARD 20 BO oaonoao 0
21. ll cable assembly Defective probe cable assembly Main Display reads A Recal using a known good calibrator solution Cell is fouled B Clean cell as described in Maintenance Section sample exceeds selected range range or to set System to Autoranging PErr procedures for the function you are attempting Main Display reads A In temp comp cond mode A amp B Adjust user defined tempco or reference LE temperature exceeds the values temperature Advanced Setup computed using user defined C Replace probe cable assembly tempco amp or reference temperature B In cell constant cal mode temperature exceeds the values computed using user defined tempco amp or reference temperature C Probe thermistor out of specs reads Err ra check procedure Troubleshoot or return the system for service reads Err check procedure Troubleshoot or return the system for service reads ovr B Probe thermistor out of B Replace probe fel assembly reads udr B Probe thermistor out B FUPCR ME probe cable assembly 14 Secondary Display Temperature jumper is set to F A A Setjumpertoread C jumper to read C Symptom Possible Cause and reading is 2199 9 F but lt 203 B Troubleshoot or return system for service F YSI Incorporated Model 30 17 SECTION 8 DISASSEMBLY PROCEDURES Refer to the Assembly drawing on the next page before atte
22. mage to the instrument 1 1 SERVICE PHILOSOPHY The YSI Model 30 is sold as a complete conductivity measuring system including an attached probe and either a 10 25 or 50 foot cable Most service issues that occur in conductivity systems are caused by improper maintenance of the probe and or cable For this reason troubleshooting efforts should be initially directed at determining the condition of the probe and cable YSI Incorporated Model 30 1 In the event that a service problem is isolated to the meter itself YSI recommends replacement of the entire defective sub assembly rather than the individual components All replacement components are available through YSI see Appendix C Warranty amp Repair In most cases the recommended method of determining a sub assemblies condition is by substitution For example to test for a defective probe cable assembly substitute the assembly with a known good assembly or a decade resistance box using Section 5 Instrument Test Procedure If after testing the PCB meets the established specifications the probe cable assembly will have to be serviced or replaced 1 2 SPECIFICATIONS Operating Environment Medium fresh sea or polluted water and most other liquid solutions Temperature 5 to 95 C Depth 0 to 10 0 to 25 or 0 50 feet depending on cable length Storage Temperature 10 to 50 C Material ABS Stainless Steel and other materials Dimensions Height 9 5 inches 24 13 cm
23. ments of the display for a few seconds which will be followed by a self test procedure that will last for several more seconds During this power on self test sequence the instruments microprocessor is verifying that the instrument is working properly and will display the cell constant of the probe when the self test is complete If the instrument were to detect an internal problem the display would show a continuous error message on the display You can discover the meaning of these error messages by consulting Section 7 Troubleshooting After the self test procedure is complete the temperature will be displayed in the lower right of the display and the instrument is ready to make a measurement Simply insert the probe into the liquid sample about which you would like to receive information It is important that the probe be inserted into the liquid deep enough so that the hole on the side of the probe is completely covered by the liquid If possible do not allow the probe to touch the any solid object while you are taking readings this may effect the reading slightly Additionally it is important that there not be any air bubbles around the probe electrodes To dislodge any bubbles that might have formed move or shake the probe vigorously several times before recording the measurement THE MODES OF THE MODEL 30 The Model 30 is designed to provide four distinct measurements Temperature which is always displayed gt Conductivity
24. mpting to disassemble the meter case Follow these steps to disassemble the meter case STEP 1 Place the instrument face down on a flat cloth covered surface Use a Phillips screwdriver to completely remove the screw located at the bottom of the hand strap STEP 2 Using a standard screwdriver or a small coin loosen the battery lid screw and remove the battery lid and all six AA size batteries STEP 3 With the instrument face down on the flat cloth covered surface place two fingers into the battery chamber and your other hand over the cable strain relief Pull straight up on the battery chamber to separate the case halves Unplug the power connector from the PC Board NOTE Because the Model 30 is water tight the case halves will be relatively difficult to separate STEP 4 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 NOTE The leads on the cable that connect to the main PC Board are quite short Be careful not to damage the terminal connectors when you pull the PC Board away from the front case STEP 5 Carefully slide the probe cable terminal connector out of its mating connector Make note of the wire color configuration so that the connectors can be correctly re installed later STEP 6 To separate the probe cable from the front case unscrew the outer portion of the strain relief that portion w
25. sor performs a self diagnostic routine each time the instrument is turned on The self diagnostic routine provides you with useful information about the cell constant function of the instrument circuitry and the quality of the readings you obtain For a list of these diagnostic features see Section 7 Troubleshooting The system simultaneously displays temperature C is factory default non CE units can be modified to read in F see section 8 4 Feature Customization along with one of the following parameters conductivity temperature compensated conductivity in uS cm or mS cm and salinity in parts per thousand ppt Though calibration is NOT required a single calibration will adjust the instrument regardless of which parameter you wish to read You can switch back and forth from salinity conductivity and temperature compensated conductivity with a single push of the MODE key A probe storage chamber is built into the instrument This chamber provides a convenient place to store the probe when the system is not in use and provides protection for the electrodes within the probe The instrument is powered by six AA size alkaline batteries A new set of alkaline batteries will provide approximately 180 hours of continuous operation When batteries need to be replaced the LCD will display a LO message The YSI Model 30 instrument case is waterproof rated to IP65 You can operate your Model 30 in a steady rain without da
26. t the Model 30 is by substitution and process of elimination Below is a procedure to test the accuracy and function of the electronics portion of the system minus the cell If any section of the test fails the board assembly will have to be repaired or replaced When disassembled the keypad function can be simulated by connecting a jumper wire to the DGNG pin of JP3 and momentarily touching the desired pin or pins 1 Disassemble the instrument case by following Section 8 Disassembly Procedures of this manual Once the conductivity cell is unplugged from PCB connector JP1 connect a decade resistance box in its place Reference Figure 1 and Figure 2 Use either a second decade resistance box or a 10K ohm resistor to substitute for the thermistor RT1 and RT2 This resistance must be substituted or an error we displayed on the LCD Drive 1 Decade Sense 1 Resistance Sense 2 Co Drive 2 RT 1 RT 2 Model 30 Test Cable Probe Simulators Figure 1 Using Section 6 System Calibration start at step 7 calibrate to 450 0 uS using inputs of 11 11 KO at R1 and 10 00 at R2 Use the charts below to test the instrument s accuracy Also check the cell constant by cycling the instrument on an off It should fall between K 4 97 and 5 03 In chart 1 the tolerance column reflects the accuracy of the decade resistance box Conductivity Test Chart 1 Decade Tolerance Nominal Reading Acceptable Reading 33 330 10
27. tance is multiplied by the cell constant that has units of reciprocal cm cm 1 The cell constant for the Model 30 conductivity cell is 5 0 cm 4 This constant is automatically confirmed each time the instrument is turned on and is determined when the calibration procedure is followed see section 6 System Calibration Solutions with conductivities of 1 00 10 0 50 0 and 100 0 mS cm which have been prepared in accordance with recommendation 56 1981 of the Organization International De Metrologie Legale OIML are available from YSI The instrument output is in mS cm for both conductivity and specific conductance The multiplication of cell constant times conductance is carried out automatically by the software TEMPERATURE EFFECT The conductivity of solutions of ionic species is highly dependent on temperature varying as much as 3 for each change of one degree Celsius temperature coefficient 3 C In addition the temperature coefficient itself varies with the nature of the ionic species present Because the exact composition of a natural media is usually not known it is best to report conductivity at a particular temperature e g 20 2 mS cm at 14 C However in many cases it is also useful to compensate for the temperature dependence in order to determine at a glance if gross changes are occurring in the ionic content of the medium over time For this reason the Model 30 software also allows the user to output condu
28. the ENTER key will cycle the Model 30 to a different manual range until you return again to autoranging Five pushes of the ENTER key will cycle the Model 30 through the four manual ranges and return the instrument to autoranging Note You may see an error message in some manual ranges if the manual range selected is not adequate for the sample you are measuring If this happens simply press and release the ENTER key again until a range is selected which is suitable for your sample If you get lost and don t know if you re in a manual range or autoranging simply turn the instrument off and back on The instrument will always default to autoranging when first turned on The four ranges of the YSI Model 30 are 0 to 499 9 uS cm 0 to 4999 uS cm 0 to 49 99 mS cm 0 to 200 0 mS cm YSI Incorporated Model 30 8 SECTION 3 MEASUREMENT ERRORS System accuracy for conductivity measurements is equal to the sum of the errors contributed by the environment and the various components of the measurement setup These include e Instrument accuracy Cell constant error e Solution temperature offset e Cell contamination including air bubbles Hlectrical noise e Galvanic effects Only the first three are of major concern for typical measurements although the user should also be careful to see that cells are clean and maintained in good condition at all times Instrument Accuracy 5 maximum The accuracy specified for the range being use
29. y due to contamination of the solution being measured which occurs when solution is carried over from the last solution measured Thus the instrument might be correctly reporting the conductivity seen but the reading does not accurately represent the value of the bulk solution Errors will be most serious when low conductivity solutions are contaminated by carry over from high conductivity solutions and can then be of an order of magnitude or more Follow the cleaning instructions carefully before attempting low conductivity measurements with a cell of unknown history or one that has been previously used in higher value solutions An entirely different form of contamination sometimes occurs due to a buildup of foreign material directly on cell electrodes While rare such deposits have on occasion markedly reduced the effectiveness of the electrodes The result is an erroneously low conductance reading Electrical Noise Errors Electrical noise can be a problem in any measurement range but will contribute the most error and be the most difficult to eliminate when operating in the lowest ranges The noise may be either line conducted or radiated or both and may require grounding shielding or both Galvanic and Miscellaneous Effects In addition to the error sources described above there is another class of contributors that can be ignored for all but the most meticulous of laboratory measurements These errors are always small and are gen
Download Pdf Manuals
Related Search