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USER Manual - Masterflex

1. scseceeseeee 112 With Manual Buffer Recognition 113 TEMPERATURE STANDARDATION 0 0000000 114 Conductivity MEASUREMENT c eseseeeeeeeee 115 GRAPHING FUNCTION 0 ccececssceeeseseeetseneeees 116 WATIrranty ccccccccccsccccccccccccccccccccccccccccceee 17 Compliance ccccccccsccsccccccccccccccccscoee 1 I7 Setting User Profiles 000 Appendix Factory DEFAULT SETTINGS 0 0ceccecee 121 122 Determining ISOPOTENTIAL POINTS EXPERIMENTALLY 0secceceeeeeseeeeseseeeeeeeeaes Replatinization c ssceceeessssssessetstsssetensneteaserees CONDUCTIVITY THEORY Replacement Parts ccccccsscscssseeee 136 137 Table of Contents Useful tips will appear in this box throughout this manual accumet excel gt Thank you for selecting a Fisher Scientific accumet meter This manual describes the operation of the accumet XL50 meter The state of the art meter that you have pur chased runs on a Windows CE platform and has a similar framework of a pocket PC or Palm Pilot It is easy to operate and will guide you through the various functions by dis playing easy to understand prompts This operating manual should answer any questions that might arise in operating your meter however do not hesitate to call our accumet Technical Support Hotline at 1 888 358 4706 if you need any assistance This meter is designed to provide all the information necessary to guide yo
2. This product is to be used only as described in the manual This product is for indoor use only and must be used in a well ventilated area WARNING To meet or exceed FCC regulations and comply with CE requirements the Fisher supplied power supply must be used Use of a power supply that is not approved by Fisher Scientific may cause safety hazards and or cause unit to exceed EMC limits and or damage unit When using this meter with a computer or printer a shielded RS232 cable must be used to meet or exceed FCC regulations and comply with CE Mark requirements Warranty Compliance Appendix Setting USER PROFILES NOTE The administrator has authority to add or delete user names Users may modify their password and company name only by entering User ID and Password in place of Admin on the User Login screen The XL50 is equipped with a User Profiles setup or the User Profile Management Application Setting user profiles saves an individual users unique Setup preferences calibration data and stored data The meter can be used without setting a user profile but it will recognize all users as Default Accessing User Profile Screen 1 Touch Home on any measurement or the Mode screen to access the Home screen 2 Double tap on AdminUser The User Login dialog box will appear Hanne 3 Touch the User ID box The alphanumeric keypad will appear Key in your User ID or admin F EN To set up new users or delete us
3. e f ATC1 REF1 pH1 SE1 Audio output ps s media player applications Trat j Infrared SD CARD IrDA gt communication eee ooo ATC2 REF2 pH2 ISE2 RS 232 COND 2 4 CELL m i Ka i EIEOEUENNETOROECOE a Conductivity BNC input connector Cell Channel 5 Channel 2 SD card reader Reference pin jack Channel 2 RS 232 Automatic Temperature Compensation ATC Channel 2 NOTE USB devices like printer mouse etc should be connected to the lower port USB A 2 Connect the electrode arm to the base Electrode base can be attached to either side of meter Purchase additonal arm with base 13 637 671 to use both sides EI Connect the power cable to the rear connector panel power jack and to a power source CENTER Getting Started Started pH and ION SPECIFIC ELECTRODES accumet _ This meter allows you to use two types of pH electrodes the conventional glass pH electrode and the AccuFET field effect transistor FET pH electrode This meter also allows you to use ion specific electrodes a1 Carefully remove the protective cover from the end of the electrode Before first using your glass pH electrode or whenever the electrode is dry soak it 2 4 hours in an electrode storage solution pH 4 Buffer or KCI solution Before using your ion specific elec trode consult the manufacturer s instructions for electrode preparation shorting cap Remove the shorting cap on BNC connect
4. Aada kiac Biei AmO Resistivity Setup Resistivity Setup When you change cell constants your calibration factor will automatically reset to default values It is recommended that you standardize your meter to establish a new calibration factor NOTE The meter and probe with ATC will measure temperature even if the temperature coefficient is set to 0 0 however a temperature correction will not be applied to the measurement accumet excel gt To Select Cell Constant This setup option allows you to select the appropriate cell constant of the cell that you are using There are three cell constants to choose from Each is used for a different range of resistivity The Resistivity Cell Constant is set the same way as previously described in Conductivity Setup See page 61 for instructions iA DD f cm To Set Default Temperature Resistivity is a temperature dependent measurement This option allows you to select a default temperature that the meter will use along with the temperature coefficient to cal culate a temperature corrected resistivity measurement If an ATC probe is used any value entered as a default temperature will be overridden in favor of the actual measured temperature of the solution provided to the meter by the ATC probe The default temperature can be set from 10 C to 110 C The Resistivity Default Temperature is set the same way as previously described in Conduct
5. If the Auto Read function is inactive then the meter will continuously monitor any TDS fluctuations To select Auto Read Mode 1 Touch MANUAL or AUTO to choose the desired read mode Aino bier fiia When you change cell constants your calibration factor will automatically reset to default values It is recommended that you standardize your meter to establish a new calibration factor accumet excel gt To Select Cell Constant This setup option allows you to select the appropriate cell constant of the cell that you are using There are three cell constants to choose from Each is used for a different range of TDS The TDS Cell Constant is set the same way as previously described in Conductivity Setup See page 61 for instructions To Set TDS Factor A TDS conversion factor is needed when a solution does not have a similar ionic content to natural water or salt water The TDS conversion factor automatically adjusts the reading The TDS conversion factor can be set from 0 40 to 1 00 To set TDS Factor 1 Touch the TDS Factor box and use the numeric keypad to enter the desired default temperature 0 40 to 1 00 3 Press Enter in the keypad to return to TDS Setup screen TOS Pi To Set Default Temperature TDS is a temperature dependent measurement This option allows you to select a default temperature that the meter will use along with the temperature coefficient to calculate a temperatur
6. Log Data button is pushed touch STABLE to automatically store lon data when lon reading is stable or touch TIMED to set a specific timed interval in seconds to store lon data 5 Touch OK button to accept the changes of the entire group of data storage criteria and return to the lon Setup screen Cats Storage Cea lon Data Storage Sebup Daba j Tirik j arr Savile D Tapki Dion gered Bettis Tice Lawl Stank dyb Qorent Shara ym i ee ee Meter f modia Serial Mo This screen allows you to choose what information you would like to be displayed on the lon Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is dis played on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option To set Display Criteria 1 Touch the Touch here to edit button next to the Display Criteria to access the pH Display Criteria Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining criteria except Display Resolution 4 Display Resolution lets you select the number of significant figures that will be used when reporting your ion measurement Touch 2 3 or 4 to select the desired significant digits 5 Touch OK button to accept the changes of the entire group of display cri
7. increase by 1 The BS key will allow you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept the first sequential Sample ID and return to the pH pH FET Setup screen To deactivate the sample ID assignment None 1 Touch None to deactivate the sample ID assignment pe paip Chang Terri ES This setup option allows you to select from 3 different buffer groups for auto buffer recognition Or you can create a custom group of buffers for auto buffer recognition by touching custom The 3 existing buffer groups are USA buffers 2 00 4 00 7 00 10 00 12 00 SS lt European buffers 1 00 3 00 6 00 8 00 10 00 13 00 ey Peed a Taaa aa as ia Gal ew SS NIST buffers 1 68 4 6 86 9 18 12 45 To select buffer group 1 Touch USA EURO NIST or CUSTOM from the setup screen to select a buffer group To set Custom pH buffer group This option allows you to create a custom buffer group of up to 5 buffers 2 buffer mini mum to be used for auto buffer recognition To obtain optimal results it is important to maintain at least 1 pH unit between selected buffers in the custom group 1 Touch CUSTOM on the setup screen to select a custom buffer This will display a set of 5 custom beakers each initialized to zero reer Touch one of the beakers to display the numeric keypad Enter a value for the custom pH buffer that you want set in
8. mY Sep Channel 1 See page 23 for pH setup directions See page 35 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity setup directions A sample ID is required if you wish to log data or do a timed printing Whenever this option is active each time you touch Log Data on the mV Measure screen the mV value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID To set sample ID Manual 1 Touch Manual for manual Sample ID entry 2 The current ID is displayed on the screen 3 Use the alphanumeric keypad on the screen to enter the desired Sample ID The BS key will allow you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept current Sample ID and return to the mV Setup screen To set sample ID Sequential 1 Touch Sequential for sequential Sample ID entry 2 The current ID is displayed on the screen 3 Use the numeric keypad on the screen to enter the desired Sample ID number that you would like your sequential Sample ID assignment to begin with Every time you touch Print or Log Data on the pH Measure screen the Sample ID will increase by 1 The BS key will allo
9. Setting TIME and DATE Setting the Time 1 From the HOME screen tap the bottom left of the screen to access the Start menu Tap Start gt Settings gt Control Panel This launches the Control Panel screen 2 Double tap Date Time icon This launches the Date Time Properties window 3 Tap the time zone down arrow and select the appropriate time zone 4 Tap the hour minutes or seconds Use up and down arrows to adjust 5 Tap AM or PM Use up and down arrow to select 6 Tap Apply button 7 Tap OK to save the time Setting the Date 1 From the HOME screen tap the bottom left of the screen to access the Start menu Tap Start gt Settings gt Control Panel This launches the Control Panel screen 2 Double tap Date Time icon This launches the Date Time Properties window Tap the left or right arrow to select a month and year Tap a day Tap Apply button oa fF Ww Tap OK to save the time You need to reset your time zone time and date if e The time changes or you are traveling to a different time zone DateTinte Properties Date Time Conran Tirna EE Norch 2 e z GAT Fae i FS 4 057 PM Ee g g Fire Zona 2413 A AAAAA AAA AAANANAAANAAAAANAAAAANAAAAANAA ANANA AAAA AAAA AAAA AAAA ANANA AA no aMT 08 00 Corral Tati US 8 Garcia ir i va H kd te of omata adjust check for ekg sara eat A ta Wh The time on the meter can be synchroniz
10. The difference in mV readings of the standard before and after the sample is added is used to calculate the concentration of the ion of interest With the analate addition method both the sample and the standard solu tion contain the ionic species of interest See ISE Theory on page 128 Taking an Analate Addition Measurement 1 Immerse the ion selective electrode in a known volume of the standard solution 2 Stir the standard 3 Wait for the reading to stabilize STABLE will appear Touch AA to take the first reading 4 Add a known volume of sample solution to the standard solution Wait for the reading to stabilize STABLE will appear Touch AA to take the second reading 9 Use the keypad to enter the sample volume Touch Enter to accept the value Use the keypad to enter the standard volume o ON OD Touch Enter to accept the value 10 Use the keypad to enter the volume of ionic strength adjuster used If no ISA was used enter a value of zero 11 Touch Enter to accept the value 12 Use the keypad to enter the concentration of the standard solution 13 Touch Enter to accept the value Your Analate Addition result is now displayed 14 Touch Print to send the data to a printer or touch Log Data to log the data to memory if a sample ID has been assigned OR Touch OK to return to the Measure screen for a new measurement accumet excel gt ton Measurement rai BS Inn SS 3213
11. When the Auto Read function is active the meter will lock onto a reading when the meter recognizes it as stable The meter will not deviate from this reading until Measure is touched If the Auto Read function is inactive then the meter will continuously monitor any resistivity fluctuations To select Auto Read Mode 1 Touch MANUAL or AUTO to choose the desired read mode Select Cell Constant This setup option allows you to select the appropriate cell constant of the conductivity cell that you are using There are three cell constants to choose from Each is used for a different range of conductivity The following indicates the optimal conductivity range for the accumet conductivity cells Optimal Conductivity Range Cell Constant 2 cell 4 cell 0 1 0 5 to 200 uS cm Not Available 1 0 0 01 to 2 mS cm 0 01 to 20 mS cm 10 0 1 to 200 mS cm 1 to 200 mS cm Check the part number on your accumet conductivity cell and compare to chart on the previous page to determine the cell constant of your conductivity cell To select Cell Constant 1 Touch 0 100 cm 1 000 cm or 10 00 cm to choose the correct cell constant Cel Garcia Regardless of the status of the Auto Read Mode STABLE will be displayed as the meter recognizes the measurement as stable When you change cell constants your calibration factor will automatically reset to default values It is recommended that you standardize your meter to establish a new
12. again 4 Repeat steps 1 3 with additional samples The meter will update the reading each time Measure is touched With Auto Read off 1 Add ionic strength adjuster to the sample 2 Immerse the ion selective electrode in the stirring sample The meter will continually monitor the ion concentration value When the meter recognizes the reading as stable STABLE is displayed on the measure screen With the Auto Read function deactivated the display on the measure screen will indicate any deviation in the concentration reading 1 174 E5 bourit Jan Method brec Raging we gih F Tou sberedioe bim bo mee sheer licen 1r Gampiu 12 Tump 20 C iefowlt ier 1 Dalat ay SRL on Typa i AMMOMEA Tope 1004 Aito Amal OFF Blank fs 20 6 mv accumet i Bea E INCREMENTAL METHODS lon Operation The incremental methods which include known addition known subtraction analate addition and analate subtraction are particularly useful with samples containing complex ionic backgrounds which cannot be matched in standards They are also useful with occa sional samples whose temperatures vary More information on these methods is available in the ISE Theory Section see page 128 Standardizing the meter for all incremental methods Prior to conducting an analysis using any of the incremental methods it is necessary to standardize the meter with at least two standards This will establish a slope value for t
13. any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID The TDS Sample ID is set the same way as previously described in Conductivity Setup See page 59 for instructions To Set Calibration Point s This option also allows you to choose single point or multi point standardardization Use the single point standardization option if you are measuring samples that close in value Use the multi point standardization option if you are measuring a wide range of samples If a single point calibration is selected there will be only one calibration factor for the entire range of operation In the multi point mode there will be one for each of the 4 ranges To select Calibration Point s 1 Touch Single Point or Multi Point to choose the method of standardization Caon Port girgin Panera To Select Stable Indicator This setup option lets you turn ON or OFF the stability indicator When this function is turned on the STABLE appears when the TDS reading is stable To select Stable indicator 1 Touch ON or OFF to turn stable indicator on or off To Select Auto Read Mode You can use this meter when the Auto Read function is active or when it is inactive When the Auto Read function is active the meter will lock onto a reading when the meter recognizes it as stable The meter will not deviate from this reading until Measure is touched
14. calibration factor Conductivity Setup Setup Set DEFAULT TEMPERATURE Set REFERENCE TEMPERATURE accumet _ accumet conductivity cells for the XL50 have a built in Temperature sensor Set Default Temperature Conductivity is a temperature dependent measurement This option allows you to select a default temperature that the meter will use along with the temperature coef ficient to calculate a temperature corrected conductivity measurement If an ATC probe is used any value entered as a default temperature will be overrid den in favor of the actual measured temperature of the solution provided to the meter by the ATC probe The default temperature can be set from 10 C to 110 C To set Default Temperature 1 Select temperature units by touching the appropriate unit button C Celsius F Fahrenheit or K Kelvin 2 Touch the Default Temperature box and use the numeric keypad to enter the desired default temperature 10 C to 110 C 3 Press Enter in the keypad to return to conductivity Setup screen Set Reference Temperature This setup option allows you to select the reference temperature to be used in the determination of the conductivity of your sample The reference temperature is the temperature to which the conductivity readings would be normalized The reference temperature can be set from 15 C to 30 C To set Reference Temperature 1 Select temperature units by touching the appropriat
15. call 1 800 766 7000 fax 1 800 926 1166 or online www fishersci com accumet excel gt Replacement Parts Replacement Parts Description Fisher Catalog Number Conductivity probe storage solution Keeps probes ideally conditioned and ready for USC ceccceeeeseeeeeeeeeeeeaeeeeeeeeeeeaeeeseeaeeeeeneeeees 09 330 1 accumet Immersion Type Conductivity Electrodes 2 Cell Conductivity Cell 4 Cell Conductivity Cell Cell constant Glass Body Epoxy Body Glass Body Epoxy Body 0 1 cm 13 620 101 1 0 cm 13 620 100 13 620 163 13 620 165 10 0 cm 13 620 102 13 620 164 13 620 166 accumet Conductivity Calibration Standards Conductivity Resistivity Dissolved Solids 16 oz bottle 100mLx6 bottles 10 umhos 0 1 megohms 6 6 ppm 09 328 1 09 328 6 100 mhos 0 01 megohms 66 ppm 09 328 2 09 328 7 1000 umhos 0 001 megohms 660 ppm 09 328 3 09 328 8 1413 umhos 0 0007 megohms 933 ppm 09 328 11 09 328 12 10 000 mhos 0 0001 megohms 6600 ppm 09 328 4 09 328 9 100 000 umhos 0 00001 megohms 66 000 ppm 09 328 5 09 328 10 To place an order call 1 800 766 7000 fax 1 800 926 1166 or online www fishersci com For a complete selection of electrodes and accessories please refer to the Fisher 2004 05 Catalog or contact your Fisher Scientific sales representative Note For electrochemistry technical support call 1 888 358 4706 fax 1 847 327 2987 or e mail techinfo fisherelectrochemistry com
16. described in Conductivity Setup See page 59 for instructions To Set Calibration Point s This option also allows you to choose single point or multi point standardardization Use the single point standardization option if you are measuring samples that close in value Use the multi point standardization option if you are measuring a wide range of samples If a single point calibration is selected there will be only one calibration factor for the entire range of operation In the multi point mode there will be one for each of the 4 ranges To select Calibration Point s 1 Touch Single Point or Multi Point to choose the method of standardization i abe bre Par i l Tiri TE To Select Stable Indicator This setup option lets you turn ON or OFF the stability indicator When this function is turned on the STABLE appears when the resistivity reading is stable To select Stable indicator 1 Touch ON or OFF to turn stable indicator on or off To Select Auto Read Mode You can use this meter when the Auto Read function is active or when it is inactive When the Auto Read function is active the meter will lock onto a reading when the meter recognizes it as stable The meter will not deviate from this reading until Measure is touched If the Auto Read function is inactive then the meter will continuously monitor any resistivity fluctuations To select Auto Read Mode 1 Touch MANUAL or AUTO to choose the desired read mode
17. if the plates are far apart and the electric field is weak By using cells with defined plate areas and separation distances it is possible to standardize or specify conductance measurements Thus comes the term specific conductance or conductivity The relationship between conductance and specific conductivity is Specific Conductivity S C Conductance cell constant k siemens cm cm siemens cm C is the Conductance siemens k is the cell constant length area or cm cm Since the basic unit of electrical resistance is the ohm and conductance is the reciprocal of resistance the basic unit of conductance was originally designated a mho ohm spelled backwards however this term has been replace by the term siemen Conductivity measurements are reported as Siemens cm since the value is measured between opposite faces of a cell of a known cubic configuration With most aqueous solutions conductivity quantities are most frequently measured in microSiemens per cm uS cm or milliSiemens per cm mS cm The accumet XL50 meter not only measures conductivity readings from micro or milli Siemens but also reads resistivity Ohms KOhms and MOhms TDS ppm and ppt and salinity ppt The salinity scale which ranges from 0 to 90 ppt is a measure of all salts not just sodium chloride This scale was originally devised for seawater and is based on seawater at 15 degrees Centigrade having a conductivity equivalen
18. parameters ON All parameters ON All parameters ON none 0 mV manual Three Significant digits Manual Celsius 25 0 C Fast 59 16 mV Direct with Standards ppm Ammonia OFF 10 00 x 1077 9 99 x 101 84 uS 1 413 mS 12 88 mS 111 8 mS Auto 0 00 uS 500000 00 uS 3 000 Ohm 100 000 MOhm 0 60 0 00 ppm 500 00 ppt 0 000 ppt 90 000 ppt accumet f ady R Determining ISOPOTENTIAL POINTS EXPERIMENTALLY Appendix The isopotential point of an electrode system is the point at which electrode potential is unaffected by a change in temperature The coordinates of this point would be reported as PXiso EiSp For an ideal system this point would be coincident with the system s Zero Potential Point PXiso Eo In practical systems however this coincidence rarely occurs and for some systems there is no true lsopotential Point but a general Isopotential area If a system exhibits an apparent Isopotential Point or at least an Isopotential area with relatively small spread lsopotential coordinates may be established and possibly used to some advantage lsopotential correction may be used only in conjunction with a One or Two Point Standardization it is required only when both accuracy over a significant temperature range as well as operation with an asymmetric electrode system are contemplated However Isopotential correction is never necessary if all measurements will be per formed on samples which are
19. says Not standardized proceed to step 5 standardization there is 5 The screen will flash each beaker icon once then a numberic keypad will appear no need to click the Clear Using the displayed keypad input the value of the buffer that you are using to button If your meter standardize the meter and then touch Enter The meter now shows the buffer already has a calibration value in the flashing beaker in the memory use the 6 When the reading is stable STABLE appears on the screen Touch Confirm to Clear button if you need standardize the buffer The meter will then return to the pH measure screen to clear the previous 7 Touch Standardize on the pH measure screen to access the standardization calibration values screen Repeat process to standardize with up to 5 buffers pH Standardize Channel 1 Channel 1 12 000 f 12 000 STABLE STABLE ss 5454 asdi ed H pren aw ay Last Standardization B Mar 2004 4 06 37 PM eg Last Stuy pon 8 Mar 2004 506 37 PM Buffer Group CUSTOM Buffer Group CUSTOM Touch Confirm to Standardize the buffer gt Touch stincardke icon to access standardeton mode gt Touch Clear to clear the provious Standardization r gt Tench Conee to retum to the Mens urement gt Touth Temp Std for Tompemturs Stondardination Sample ID Tomp 25 50 ATC Sample ID Temp 2550 ATC User ID Dokwlt UserID Detowtlt mW 295 7 Auto Bul
20. teace Sede shane as dadeacd sine a cecees ethenace sean eeises rues es 13 620 19 AccuFlex electrode Support arm and DaSe ccccccecessceeeeseeeeeceeeeeeaeeeeeaaeeseaaeeeeaaeeeeaeeneeaeeeeeeaeeeeeaee 13 637 671 BNC Shorting Cap wits ccccccesescssssccssccessctseccasseseceeasatesecntstevceceaedccvesacduesenssatexcieeusedsoadnscseasetsedtedozeabersoaeneces 13 620 99 Accessories pH Electrode Fisher Catalog Number accuCap Glass Body Gel Filled pH Combination Electrode uo eececceeceseeeseseseeeseseneeseeeeneneeeees 13 620 131 accuCap Plastic Body Gel Filled pH Combination Electrode 13 620 132 accuCap Glass Body Spear Tip pH Combination Electrode eeceeeeecceseesssseseeeseeeneesseeeeseeseneee 13 620 133 accumet 3 in 1 pH ATC combination electrode single junction Ag AgCl reference epoxy body BNC CONMCCION sssccccicececcseccascrcoscanccceseatestevsuscasecesacnsescezeneeas ccacsased sostorsiecsedsnstersocvaseasedtestavessenesersetersees 13 620 530 accumet 3 in 1 pH ATC combination electrode Tris compatible calomel reference epoxy body BNO CONNECCION i sccsiiscesciacuces sacesstviebecnctcesctecdsta sts cob cnduscsanssracersuacnsteabiivsthconcvacstictienvaastviva tdvaecnecbirearivesta 13 620 531 AaCCUFet XL cone tip electrode srsccceitse oc ccsseesescevtagates case cescessecenataned anavecesdckees seceuael lt priuaczastebiueaueddeadecias 13 620 700 accuFet XL cup tipeleCtrode ici cccrseevecusace cede cedeaanstynscecadesscevvasscetagecesvavd
21. the meter available in Channels 1 and 2 lon The lon mode button allows you to switch to the various ion concen tration operations of the meter available in Channels 1 and 2 pH FET The pH FET mode button allows you to switch to the various pH FET operations of the meter available in Channel 3 only The Conductivity mode button allows you to switch to the various conductivity operations of the meter available in Channel 5 eecee Conductivity The Resistivity mode button allows you to switch to the various resistivity operations of the meter available in Channel 5 Resistivity The TDS mode button allows you to switch to the various TDS operations of the meter available in Channel 5 S TDS The Salinity mode button allows you to switch to the various salinity operations of the meter available in Channel 5 Salinity Using the Meter BUTTON FUNCTIONS accumet The following buttons appear in all single channel screens ae Print CQ E Standardize D a E The Print button will send information to the output device that is connected to your meter If you selected the Log data option in the Print criteria setup clicking on the print button will dump the logged data to the printer The Standardize button accesses the standardization screen from the various measure modes and initiates standardization of the meter once the standardization screen is ac
22. this value and return to lon Setup screen Set Alarm Limits This option allows you to set alarm limits for the ion measuring mode If the ion concentration value of the measurement is outside of the boundaries set by the minimum and maximum limits a visual warning will appear to let you know that your sample measurement was outside of the set limits The validity range of alarm limits is 0 000001 to 99 900 000 000 To set Alarm Limits 1 Touch ON or OFF to set the status of the alarm 2 Touch the Low box and use keypad to enter the new limit values 3 Touch Enter on the keypad to accept this limit and return to the lon Setup screen 4 Touch the High box and use keypad to enter the new limit values 5 Touch Enter on the keypad to accept this limit and return to the lon Setup screen 1 000 E Baer Linn 2 Fin This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed on demand To set Print Criteria 1 Touch the Touch here to edit button next to the Print Criteria to access the lon Print Criteria Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining c
23. to enter the desired default temperature 5 C to 105 C 3 Press Enter in the keypad to return to lon Setup screen eta Tiros at 5 Best results are obtained when the standards and the samples are at the same temperature accumet _ TEMPERATURE COMPENSATION ISOPOTENIAL POINT ALARM LIMITS ton setup Set Apply Temperature Compensation lon concentration is a temperature dependent measurement Best results are obtained when the standards and the samples are standardized and calibrated at the same temper ature However if you have experimentally determined the isopotential point of your electrode then you can choose to set ATC to YES and enter the isopotential value This option is set to NO by default To set Apply Temperature Compensation 1 Touch YES to choose Apply Temperature Compensation Set Isopotential Point The isopotential point is the millivolt reading for an electrode at which temperature has no effect on the measurement lon Selective Electrodes unlike pH electrodes are not designed to achieve any particular isopotential point If samples and standards are at different temperatures when performing ISE experiments it will be necessary to e xperimentally determine the isopotential point of your own lon Specific Electrode To set Isopotential Point 1 Touch the Isopotential Point box and use the numeric keypad to enter the desired mV setting for the new isopotential point 2 Touch Enter to accept
24. via the standard For example a chloride ISE can be immersed in sample for a chloride measurement If a silver standard is added to the sample AgCl precipitates effectively removing or subtracting chloride ion from the sample Equations for known addition and known subtraction calculations are as follow Known Addition C std V std E S Vs Vota 10 Vy Known Subtraction c C std V std E S Vs 7 Wg Vsta 110 where Cg is the concentration of the sample Cgtq is the concentration of the standard Vs is the sample volume Vstq is the standard volume E is the difference in millivolt readings from the electrode and S is the slope of the electrode determined in a previous standardization Whereas the direct method is suitable for samples with fairly uncomplicated ionic matrices the addition methods are advantageous with samples that have complex matrices samples in which no ISA is added samples in which excess complexing species are present and samples whose concentration is in the non linear region on the electrode response curve Analyte Addition and Analyte Subtraction In the Analyte methods the initial millivolt reading is taken with the electrode immersed in the standard then an aliquot of sample is added and the final millivolt reading is taken Sample concentration is calculated from the change in the millivolt readings Analyte Addition C Ctd Vg std 10E S es Csta Vs Analyte Subtracti
25. warnings will let you know that your sample measure ment was outside of the set limits The Alarm Limit can be set from 3 000 Ohm to 100 000 M Ohm To set Alarm Limits 1 Touch ON or OFF to set the status of the alarm of resistivity mode 2 Touch the Low box and use numeric keypad to enter the new limit values 3 Touch Enter on the keypad to accept this limit and return to the resistivity Setup screen 4 Touch Ohm KOhm or MOhm to select resistivity units of low alarm value 5 Touch the High box and use numeric keypad to enter the new limit values 6 Touch Enter on the keypad to accept this limit and return to the resistivity Setup screen 7 Touch Ohm KOhm or MOhm to select resistivity units of high alarm value To Set Print Criteria This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed on demand The Resistivity Print Criteria is set the same way as previously described in Conductivity Setup See page 64 for instructions Print Cetera Tinah bom los alt Resistivity Setup Resistivity Setup accumet excel gt To Set Data Storage Criteria This screen allows you to select which criteria are stored in the data logger
26. with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be stored on demand The Resistivity Data Storage Criteria is set the same way as previously described in Conductivity Setup See page 65 for instructions Date Sinaga Criceria Touch har to ait To Set Display Criteria This screen allows you to choose what information you would like to be displayed on the resistivity Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option The Resistivity Display Criteria is set the same way as previously described in Conductivity Setup See page 66 for instructions Cipiry Cetin Touch hes im ai To View Stored Data The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to sort and look at specific data points stored in the meter based on the meters memory capacity The stored data can be sorted by any of the parameters available in the screen header The meter stores resistivity data under the following parameters Read
27. 1 2 with additional samples lon Measurement teen iChanwel 1 5 000 E 4 STAMME Tin Laria diu os bo ee sherbet nek Una 10 J mV s lt 0 6 km Tipe i ia 14 Au Airai OFF Blank Dli 2 accumet excel gt DIRECT READING METHODS lon Operation Operation Direct Reading with Blank Offset This method presents you with the ability to measure sam ples with low level concentrations of the ion of interest It eliminates background interference by subtracting the value of a blank concentration from the value for the sample See ISE Theory on page 128 To Standardize the Meter Using Direct reading with Blank Offset You will need to standardize the meter with one blank and a minimum of two standards Make sure that you have selected Direct Reading with Blank Offset on the lon Setup screen 1 Add ionic strength adjuster to the standards and the blank 2 Immerse the ion selective electrode in the blank or standard containing the lowest concentration of the ion of interest 3 Stir the standard or blank 4 Touch Standardize to initiate the standardization process At this point the meter will display the question Is this reading standard or blank 5 Touch STANDARD if the sample that the electrode is immersed in is an lon standard solution OR Touch BLANK if the sample that the electrode is immersed in is the blank solution If you touched STANDARD 6 The Meter goes to the Standard
28. 2 88 mS and 111 8 mS and accept them when the meter recognizes the reading as stable When in the Manual standard recognition mode you must enter the buffer value dur ing the standardization procedure The meter will accept the manually entered buffer once the measurement is stable This option also allows you to choose single point or multi point standardardization Use the single point standardization option if you are measuring samples that close in value Use the multi point standardization option if you are measuring a wide range of samples If a single point calibration is selected there will be only one cali bration factor for the entire range of operation In the multi point mode there will be one for each of the 4 ranges To select Standard Recognition 1 Touch Auto or Manual to choose the method of standard recognition To select Standardization Points 1 Touch Single Point or Multi Point to choose the method of standardization aiae i ee accumet excel gt Select STABLE indicator AUTO READ MODE CELL CONSTANT ETTET Setup Select Stable Indicator This setup option lets you turn ON or OFF the stability indicator When this function is turned on the STABLE appears when the conductivity reading is stable To select Stable indicator 1 Touch ON or OFF to turn stable indicator on or off Select Auto Read Mode You can use this meter when the Auto Read function is active or when it is inactive
29. 21 for default settings The mV Setup section will guide you through the various options available in the mV setup mode G3 mv Setup Chace 1 Tero Berri Lines Brink Criteria Touch hoe in acti Cate Storage Crewe Touch hase to iit Cigna Crea Touch here tro iE Function buttons on mV Setup Screen Touch OK to confirm mV Setup and return to the mV Measure screen Touch Cancel to exit and return to the mV Measure screen without confirming mV Setup Touch View to view all mV data points stored in memory See pages 42 43 for details When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all mV Setup Criteria to the factory default To access the Setup screen 1 Make sure you are in the mV Measure screen either dual display or single display see page 22 2 Touch the Setup button to access the mV Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change mV parameters select the mV Setup button E mi Sip Charred If you were in single display mode you will access the Setup mode for the single channel displayed only
30. E TEMPERATURE Set TEMPERATURE COEFFICIENT Set ALARM LIMITS cccccceeccseeeeee Set PRINT CRITERIA 2000cc00008 S Set DATA STORAGE CRITERIA ccccccecsseeesseees Set DISPLAY CRITERIA cccccccccceccccesssceeststeesseeees View STORED DATA cccccccceccscceessceessseeenes Resistivity Setup Resistivity SETUP SCREEN and Function Buttons 69 Access Resistivity SETUP ccccccsesseseeeseneteene 70 Set SAMPLE ID cccccceseeseeee rfl Set CALIBRATION POINTS A Select STABLE indicator sall Select AUTO READ MODE wid Select CELL CONSTANT cccccccccccsesesessesesesssseees 72 Set DEFAULT TEMPERATURE 200cc0ccceccceeceeeseee 72 Set REFERENCE TEMPERATURE c00cc00cc00000 72 Set TEMPERATURE COEFFICIENT 20 cc000cc000000 72 Set ALARM LIMITS cccccccccsccssessenscessessessesssessenees 73 Set PRINT CRITERIA o ccccccccccccccsseesccesscesscesseesseee 73 Set DATA STORAGE CRITERIA 74 Set DISPLAY CRITERIA 00006 TA View STORED DATA 0 ccccccccccccecssesssesseesseeesseenes 74 TDS Total Dissolved Solids Setup TDS SETUP SCREEN and Function Buttons Z5 Access TDS SETUP 76 Set SAMPLE ID cccccccceeseeee ms Set CALIBRATION POINTS eet Select STABLE indicator c ccccccccessesesessesssessseees 77 Select AUTO READ MODE ccccceccesecseseeseseee 77 Select CELL CONSTANT 78 Set TDS
31. EMENT Conductivity Operation This meter allows you to measure conductivity resistivity TDS total dissolved solids and salinity Each mode is independent from one another and needs to be standardized separately However the basic procedure for standardization and measurement is similar for each mode This manual will focus on conductivity standardization and measurement with the variations for other modes noted Each measuring mode has four measuring ranges Conductivity 0 to 200 0 uS 200 0 uS to 2 000 mS 2 000 to 20 00 mS and 20 00 to 500 0 mS Resistivity 0 to 20 00 KOhms 20 00 to 200 0 KOhms 200 0 KOhms to 2 000 MOhms and 2 000 to 100 0 MOhms TDS 0 to 200 0 x TDS factor ppm 200 0 x TDS factor to 2000 x TDS factor ppm 2 000 x TDS factor to 20 00 x TDS factor ppt and 20 00 x TDS factor to 200 0 x TDS factor ppt Salinity 0 to 0 094 ppt 0 094 to 1 000 ppt 1 000 to 11 50 ppt and 11 50 to 90 00 ppt Before measuring conductivity resistivity TDS or salinity you will need to standardize the meter using standards with known conductivity resistivity TDS or salinity values This meter can perform a single or multi point standardization You will need to set your meter to single or multi point calibration in the Setup mode for conductivity resistivity TDS or salinity You may also use the Setup mode set conductivity to auto standard recognition to recognize preset values 84 uS 1 413 mS 12 88 mS and 111 8 mS The mete
32. ESS FOR A PARTICULAR PURPOSE Fisher s sole responsibility and the purchaser s exclusive remedy for any claim arising out of the purchase of any product listed above is repair replacement or credit as described above where applicable In no event 1 shall the cost of the exclusive remedy exceed the purchase price 2 shall Fisher be liable for any special indirect incidental consequential or exemplary damages howsoever arising even if Fisher has been advised of the possibili ty of such damages Each article that Fisher furnishes will conform to the written specifications given in this manual or those of a further improved model Changes are made often to the information in the manual and will be incorporated into future editions Notice of Compliance WARNING This meter generates uses and can radiate radio frequency energy If not installed and used properly that is in strict accordance with the manufacturer s instruc tions it may cause interference to radio communications It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules which are designed to provide reasonable protection against such interfer ence when operated in a commercial environment Operation of this equipment in a resi dential area may cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference
33. FACTOR cccccceceee 78 Set DEFAULT TEMPERATURE 200cccccceccceecceesee 78 Set REFERENCE TEMPERATURE 0ccsccccceeeenees 78 Set TEMPERATURE COEFFICIENT 20 c000cc000000 79 Set ALARM LIMITS cccccccccccecccecssessecssceeseceeeessees 79 Set PRINT CRITERIA o ccccccccccccccsseesccesscesscessecsseee 79 Set DATA STORAGE CRITERIA ccccccsceseessenees 80 Set DISPLAY CRITERIA 80 View STORED DATA cccccccccssssesescesscsscescensenseees 80 accumet excel gt Salinity Setup SALINITY SETUP SCREEN and Function Buttons 81 Access Salinity SETUP c ccecsscsssseseseeenetsesereeed 82 Set SAMPLE IDE orriei EEN ERR Set CALIBRATION POINTS Select STABLE indicator Select AUTO READ MODE cccccccsccsesseseeseeeee Select CELL CONSTANT u ccccccecccccssessesssseseseesees Set DEFAULT TEMPERATURE Set REFERENCE TEMPERATURE Set TEMPERATURE COEFFICIENT 00 cc00ccc0000004 84 Set ALARM LIMITS ccccccccccccecscecscessccesecesssesseesseee Set PRINT CRITERIA 0 00cc000008 Set DATA STORAGE CRITERIA Set DISPLAY CRITERIA 00cccccccceccccecsesssceetecenseed View STORED DATA 0 cccccccccceccsecscesscesseeeseeesece pH Operation About pH MEASUREMENT 0 c c cccscseseeeeeees STANDARDIZING oonan With Auto Buffer Recognition With Manual Buffer Recognition 1 11 89 TEMPERATURE STANDARDATION 00 0000000 90 pH MEASUREMENT with Auto Read ON an
34. FH Temy JAN tiui mu a7 Shops 10 Hank Os 2 0 6 mW ANALATE ADDITION METHOD lan Masa inert iin Ohim lon Operation 107 ton Operation _ Operation ANALATE SUBTRACTION METHOD accumet _ Measuring Concentration in Samples Using the Analate Subtraction Method The analate subtraction method is useful when no ion specific electrode is available to measure the ion of interest directly Like known subtraction the sample and the standard contain different ionic species However the ion being measured is in the standard and not in the sample The reduction of free ions in the standard solution is proportional to the concentration of the ion of interest in the sample See ISE Theory on page 128 Taking an Analate Subtraction Measurement 1 2 3 Immerse the ion selective electrode in a known volume of the standard solution Stir the standard Wait for the reading to stabilize STABLE will appear Touch AS to take the first reading Add a known volume of sample solution to the standard 5 Wait for the reading to stabilize STABLE will appear Touch AS to take the second o ON O reading Use the keypad to enter the sample volume Touch Enter to accept the value Use the keypad to enter the standard volume Touch Enter to accept the value 10 Use the keypad to enter the volume of ionic strength adjuster used If no ISA was used enter a value of zero 11 Touch En
35. Mode 1 Touch MANUAL or AUTO to choose the desired read mode Regardless of the status of the Auto Read Mode STABLE will be displayed as the meter recognizes the measurement as stable Set lon Stability Criteria This setup screen allows you to determine how quickly the meter will respond to electrode drift There are three speed settings fast medium and slow To set lon Stability Criteria 1 Touch FAST MEDIUM SLOW to choose the desired stability criteria Ei Staley Creer Stability criteria are more stringent at the slower setting Therefore if the highest precision is required then a slow setting would be desired The default setting is the FAST and this should be adequate for the majority of applications without making any changes Set Default Temperature It is a well known fact that ion concentration is a temperature dependent measure ment The factory default setting is 25 C If you are measuring a solution that is not 25 C and if you are not using a temperature probe then you should enter the tem perature value of that solution in order to get the correct concentration value The current default temperature setting will be displayed on the screen The default temperature can be set from 5 C to 105 C To set Default Temperature 1 Select temperature units by touching the appropriate unit button C Celsius F Fahrenheit or K Kelvin 2 Touch the Default Temperature box and use the numeric keypad
36. N and Function Buttons 35 Access mV SETUP Set SAMPLE ID 0000 Set ALARM LIMITS 00 0066 Set PRINT CRITERIA SETUP Set DATA STORAGE CRITERIA Set DISPLAY CRITERIA cccccceeeeeee View STORED DATA cccccccccceesssceseessseeees lon Setup lon SETUP SCREEN and Function Buttons 44 Access lon SETUP cccccccccsccceessssseeesseees Set SAMPLE ID 0 0005 ION METHOD oniinn Set ELECTRODE TYPE Set DEFAULT TEMPERATURE 0 0ccceccseeeeeeees 50 Set TEMPERATURE COMPENSATION 00000 51 Set Isopotential Point c cscssecsseetssseeeeeeteteeeeees 51 Set ALARM LIMITS ccccccseeseeeeeetersesneeneeeees 51 accumet excel gt Set PRINT CRITERIA wo esecsecsecceseeseeseeseceseeseeseeaes Set DATA STORAGE CRITERIA Set DISPLAY CRITERIA 000 View STORED DATA cccccsccsseseseeeeeeeees Conductivity Setup Conductivity SETUP SCREEN and Function Buttons cccccececscsesessesesesseseseesess 57 Access Conductivity SETUP Bs Set SAMPLE ID oo ccccccecccceesscceesscceesscesessseenseees 59 Conductivity STANDARDS 1 sccssseseeseeeeeeteees 60 Select STANDARD RECOGNITION 60 Select STABLE indicator cccccccee0 R Select AUTO READ MODE 0 ccccccecssccsesseseeseeeee Select CELL CONSTANT cccccccecccsesescssesesesseseees Set DEFAULT TEMPERATURE Set REFERENC
37. V ion meter or to construct a calibration curve by plotting the electrode s output in mV versus the log of the concentration The sample concentration is then read from the meter or the calibration curve The advantages of the direct method of analysis are 1 Many samples particularly those with relatively simple ionic backgrounds can be quick ly measured after a single calibration procedure 2 The technique is valid over a wide range of concentrations 3 Sample volume values are not required and may also vary over a wide range Incremental Methods These procedures can reduce errors caused by temperature variations complex matrices and complexation They are also useful for applications where only occasional samples are analyzed Incremental methods include Known Addition Known Subtraction Analyte Addition and Analyte Subtraction Known Addition and Known Subtraction With the Known Addition and Known Subtraction methods the initial millivolt output of the electrode in the sample solution is measured Then an aliquot of standard solution is added and a final millivolt potential is measured The concentration of the sample can then be computed from the observed change in the millivolt readings before and after the addition The techniques differ in that with Known Addition the standard added is the same ionic species as that being measured With Known Subtraction the measured ion is not the same as the one being added
38. V readings of the sample are taken before and after the addition of the standard The concentration of the sample can then be calculated based upon the difference in the mV readings The use of the incremental methods requires that certain parameters be identified In addi tion to the millivolt outputs of the electrode s in both the sample and the sample plus the standard it is necessary to enter into the meter the volume of the sample the volume of the standard the volume of the lonic Strength Adjuster ISA if used the concentration of the standard and as previously stated the slope of the electrode in use Your accumet research meter will prompt you through the method permitting you to enter the appropriate parameters at the appropriate time When the meter has all of the data needed for the calculation it will display the ion concentration of the sample as well as the parameters entered for the calculation The standard concentration should be high enough to nearly double the sample ion con centration after its addition However the standard volume should not significantly impact the sample volume A 1 100 ratio of standard to sample ratio is optimal For a monovalent electrode the standard addition should result in a 15 30 mV change For a divalent elec trode a 7 10 mV change is adequate If the millivolt change is too high the addition of the standard may affect the ionic strength and therefore the activity coefficients This coul
39. accumet excel gt USER Manual Fi USER Manual Table of Contents Introduction ccccccccccsccccsccccscccscssscssscsssscnell Unpacking the Meter cccccsssscccsssssssee Specifications ccccccccccccccccccsccscssssseeere D Getting Started CONNECTORS cussies seiate is deriste 7 pH and lon ELECTRODES c cscsssssesteseseeeeeens 8 9 Conductivity CELLS sesscesssssseeeseetseeeeneneeenees 10 Using the Meter TOUCH SCREEN OPERATION Contrast adjustment secceceseeeeeteteeeteneteeeees Using the STYLUS 0 Stylus Calibration Setting TIME and DATE ON SCREEN KEYBOARD EXPANSION CARD onaniaa Connecting to the INTERNET s ssceeeeeeees BUTTON FUNCTIONS ccsccecseceeceseeeeseeeeees 18 20 CHANNEL ASSIGNMENT DISPLAY SETUP x ves cess resimini aR pH Setup pH SETUP SCREEN and Function Buttons 23 Access PH SETUP ses civessesassstansacssespcoerssvesees Set SAMPLE ID 0000 Select BUFFER GROUP Select BUFFER RECOGNITION Select AUTO READ MODE 2 0000 Set pH STABILITY CRITERIA 000 Set DEFAULT TEMPERATURE Set ISOPOTENTIAL POINT 0 00008 Set ALARM LIMITS sissies rirerire Set PRINT CRITERIA cscsccsesseseesessesenseseeeentens Set DATA STORAGE CRITERIA Set DISPLAY CRITERIA SETUP 0 View STORED DATA 0 cccsccsecsseseseeeeteeeees mV Setup mV SETUP SCREE
40. ample ID entry 2 The current ID is displayed on the screen 3 Use the numeric keypad on the screen to enter the desired Sample ID number that you would like your sequential Sample ID assignment to begin with Every time you touch Print or Log Data on the pH Measure screen the Sample ID will increase by 1 The BS key will allow you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept the first sequential Sample ID and return to the mV Setup screen To deactivate the sample ID assignment None 1 Touch None to deactivate the sample ID assignment Conductivity Setup Tero Conductivity Setup PM CONDUCTIVITY STANDARDS Select STANDARD RECOGNITION accumet _ Conductivity Standards This setup option shows the set conductivity standards available for auto standard recognition If Manual standard recognition is selected the Conductivity Standards sec tion will be blank Conde ferby Shanda tiny Ama Conductivity Standards available with Auto Standard Recognition Comkistwiy Standards n pinin Sng Pont Mut Pott Fragt i J E 4 Setup Screen with Manual Standard Recognition Select Standard Recognition This option allows you to select Automatic standard recognition or manual standard recognition when standardizing With the automatic standard recognition activated the meter will automatically recognize the buffers from the preset group 84 uS 1 413 mS 1
41. an choose e one of 6 methods of analysis e the specific electrode you will be working with e the units that you would like the meter to use when reporting the ion concentration The lon Measure screen displays the direct readout of sample concentration in the desired units as well as the time and date of the last calibration The standards used in the cali bration and the slope of the electrode are also displayed on the screen It is important to note that the concentration reported by the meter is actually the concentration of free uncomplexed ions in your solution Connect the electrodes you will be using to the meter See pages 8 9 for details Remember to setup your lon measuring mode parameters Refer to pages 44 56 for lon setup instructions lon Measurement pam 4 993 E 4 5 LABLIE age BF 05 hoes h Poiana lon Tyme AMMONIA ton Measurement porn Channel 2 9 586 E10 Sammie BT 23 Teen 250 Cite ee 4128 ilon Tyme POTTASIUM Siopa 10I Muta biad OFF Blank Os ant Dhamiri DAW Jan ad ee Pl accumet i Bea E DIRECT READING METHODS lon Operation There are two direct reading methods Direct Reading with Standards and Direct Reading with Blank Offset These types of measurements allow you to directly read the concentration of your sample after standardizing the meter with ion standards of known values or blank values Direct Reading with Standards This is the most common method o
42. and the outside of the glass tip If the pH sensitive glass tip or membrane is to function properly it must be hydrated A dry or dehydrated electrode membrane will not respond properly to changes in acidity PH electrodes are also effected by changes in temperature and the presence of other ions Temperature effects can be countered by temperature compensation functions on the pH meter While temperature compensation will not allow you to predict what the pH of the sample is at another temperature it will permit you to accurately assess the pH at whatever temperature you are presently working pH sensitive membranes are also sensitive though to a lesser extent to other ions than the hydronium ion For example most pH glasses are somewhat sensitive to sodium ion as well For some pH glasses this means an error as high as 0 5 pH units in highly alkaline high sodium solutions The special FS 5 glass used in Fisher s pH electrodes exhibits much less sodium error in these solutions lt 05 pH units Reference electrodes typically consist of three elements an internal reference elec trode a filling solution and a reference junction through which the filling solution can flow and provide electrical contact with the sample and the internal reference elec trode The most convenient internal reference electrodes are made from a metal Such as silver or mercury and its sparingly soluble salt silver chloride or mercurous chloride The filling
43. ane See page 23 for pH setup directions See page 35 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity setup directions A sample ID is required if you wish to log data or do a timed printing Whenever this option is active each time you touch Log Data available on the single display pH Measure screen the pH or pH FET value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID To set sample ID Manual 1 Touch Manual for manual Sample ID entry 2 The current ID is displayed on the screen 3 Use the alphanumeric keypad on the screen to enter the desired Sample ID The BS key will allow you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept current Sample ID and return to the pH or pH FET Setup screen To set sample ID Sequential 1 Touch Sequential for sequential Sample ID entry 2 The current ID is displayed on the screen 3 Use the numeric keypad on the screen to enter the desired Sample ID number that you would like your sequential Sample ID assignment to begin with Every time you touch Print or Log Data on the pH Measure screen the Sample ID will
44. anil To View Stored Data The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to sort and look at specific data points stored in the meter based on the meters memory capacity The stored data can be sorted by any of the parameters available in the screen header The meter stores TDS data under the following parameters Reading Operator Date Time Channel Sample Id Temperature Last Standardizations Meter Model Serial No Viewing Stored TDS Data is done the same way as previously described in Conductivity Setup See pages 67 68 for instructions accumet a L ices ee SALINITY SETUP SCREEN Salinity Setup The salinity Setup screen present many options to control the operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 122 for default settings The operating parameters of the salinity mode can be set and controlled from the salinity setup screen The salinity Setup section will guide you through the various options available in the salinity setup mode mie Seto Chae pe Seip charred i E Siriy Setup Tero E Default Termperstire 0 a Reteerce Terpstra 20 s Femperntue Coide 2O Brin Criteria Tou hie fn edit Dala Gorig Dii Toh here fo AE Dipi Caii T u h fo t Function Buttons on Salinity Setup Screen Touch OK to confirm salinity Setup and return to t
45. ardization 5 The Temperature Standardization screen appears Check the current temperature displayed with that of the solution of known temperature Touch the Standardization Temperature box and use numeric keypad to enter the current temperature Press Enter to confirm value 6 Touch OK to confirm Standardization Temperature and return to the conductivity Measure screen Touch Reset to reset and enter a new standardization tempera ture Touch Cancel to cancel temperature standardization and return to the conductivity Standardization screen Note The meter will not allow entered value to exceed 5 C of the ATC probe value If entered value exceeds 5 C an error window will appear and you will have to re enter value or cancel out of the temperature screen This might indicate that you have a faulty ATC probe Tempemture Standardization Temperature Standardization accumet excel gt MEASUREMENT Conductivity Operation Once the meter is standardized you are ready to take conductivity resistivity TDS or salinity measurements of your sample 1 Immerse the rinsed conductivity cell with built in ATC into the sample solution The immersion depth should be enough to cover the vent holes on the electrode 2 Stir the solution with the electrode briefly and then let the electrode sit still in the solution 3 Record the reading once the measurement has become stable STABLE will appear once the meter recognizes tha
46. ars when the salinity reading is stable To select Stable indicator 1 Touch ON or OFF to turn stable indicator on or off To Select Auto Read Mode You can use this meter when the Auto Read function is active or when it is inactive When the Auto Read function is active the meter will lock onto a reading when the meter recognizes it as stable The meter will not deviate from this reading until Measure is touched If the Auto Read function is inactive then the meter will continuously monitor any Salinity fluctuations To select Auto Read Mode 1 Touch MANUAL or AUTO to choose the desired read mode Salinity Setup Salinity Setup When you change cell constants your calibration factor will automatically reset to default values It is recommended that you standardize your meter to establish a new calibration factor NOTE The meter and probe with ATC will measure temperature even if the temperature coefficient is set to 0 0 however a temperature correction will not be applied to the measurement accumet excel gt To Select Cell Constant This setup option allows you to select the appropriate cell constant of the cell that you are using There are three cell constants to choose from Each is used for a different range of salinity The Salinity Cell Constant is set the same way as previously described in Conductivity Setup See page 61 for instructions To Set Default Temperature Sal
47. at similar temperatures Most conventional pH electrode systems are designed and manufactured to be highly symmetrical cells Consequently for most pH work unless ultimate accuracy over broad temperature ranges is required lsopotential may be ignored Specifically this is accomplished by setting the Isopotential at its reset value of zero millivolts The following is an example for determining an lsopotential Point Data points are first established for three different standards at three different tempera tures The data points are then plotted and will produce three isotherms which should resemble the plot in either figure 1 or figure 2 In figure 2 the Isopotential Point is well defined as the intersection point of the three Isotherms PX iso E iso The Isopotential Point is not so well defined in figure 1 but a value may be interpolated with some accepted error ks Figure 1 Figure 2 TN N 1 TN AN K N W o w i 4 i 4 sy VL ISGROTENTAL PONT t J BOPOTENTIAE Yi a y a ARES EAN pe Ena pH pH Since its introduction by the Danish chemist Sorensen in 1909 pH measurement has become one of the most commonly used and important measurements in both laboratory and industrial settings pH measurement and control is vital to a wide array of endeavors including municipal and industrial wastewater treatment and textile pharmaceutical food and petroleum production Even our very exi
48. be set from 0 to 10 000 The Salinity Temperature Coefficient is set the same way as previously described in Conductivity Setup See page 63 for instructions Tare ne Cee accumet excel gt To Set Alarm Limits This option allows you to set alarm limits for the salinity measuring mode If the salinity value of the measurement is outside of the boundaries set by the minimum and maxi mum limits audible and visual warnings will let you know that your sample measurement was outside of the set limits The Alarm Limit can be set from 0 to 90 000 ppt To set Alarm Limits 1 Touch ON or OFF to set the status of the alarm of salinity mode 2 Touch the Low box and use numeric keypad to enter the new limit values 3 Touch Enter on the keypad to accept this limit and return to the salinity Setup screen 4 Touch the High box and use numeric keypad to enter the new limit values 5 Touch Enter on the keypad to accept this limit and return to the salinity Setup screen Blan Lives To Set Print Criteria This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed on demand The Salinity Print Criteria is set the same way as previously described
49. bo tabo isi padding uig ENC ADDITION 61 0 m gt Tor vheleice Goce bo cers rbaribaniirsii moir 12 2 m 12 2 mi 100 0 10 0 O 0 10 0 103 lon Operation KNOWN SUBTRACTION METHOD accumet Measuring Concentration in Samples Using the Known Subtraction Method The procedure for known subtraction is very similar to that for known addition method see page 102 An aliquot of standard is added to a known volume of the sample The difference is that the standard does not contain the same ionic species that you are trying to measure in the sample Instead it contains an ion that will complex or precipitate the ion of interest removing it from the sample Like known addition the mV readings are taken before and after the standard is added to the sample and the difference in mV values can be used to calculate the concentration of free ions of interest in the sample This method will also require you to enter values of cer tain parameters in order to obtain an ion concentration See ISE Theory on page 128 Taking a Known Subtraction Measurement 1 Immerse the ion selective electrode in a known volume of the sample solution 2 Stir the sample 3 Wait for the reading to stabilize STABLE will appear Touch KS to take the first reading 4 Add a known volume of standard solution to the sample Wait for the reading to stabilize STABLE will appear Touch KS to take the second reading Use the keypad t
50. cess the pH Print Criteria Setup screen Touch ON or OFF to change the status of a criteria you want to modify Repeat step 2 for all the remaining criteria except Print Option For Print Option select between Log Data and Timed If Log Data is selected clicking on the Print button from the Measurement screen will send the logged data to the printer If Timed is selected you can print data at an interval you select This data is buffered and is sent to the printer when the page is full Touch OK button to accept the changes of the entire group of print criteria and return to the pH pH FET Setup screen Ferrit riari Tosh here to edi pii Print Cr iber la Setup Bate j Tirra Gurra hone Tagara DH Lat Giedr ON Lumen aa Soe Tie esr Miter j Metal Serial Ha CFF oF CHF DEF FF OFF FF ORF DEF E F Erini Dopisi accumet Set DATA STORAGE CRITERIA excel gt This screen allows you to select which criteria are stored in the data logger with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be stored on demand To set Data Storage Criteria 1 Touch the Touch here to edit button next to the Data Storage Criteria to access the pH Data Storage Setup screen 2 T
51. cessed The Measure button directs the meter to measure your sample when in the Auto Read function of the pH ion or pH FET modes The following buttons appear in the mV single channel screen ae rel mV abs mV The rel mV button returns the meter into SAHARAN Canes Gere the relative millivolt mode when in the Addattat tha dete wks absolute mV mode When this mode is Onn activated a window will appear asking you to set a relative mV value or accept the default value of 0 mV This feature may assist the user to standardize certain analytical and monitoring activities such as titration The abs mV button returns the meter to absolute millivolt mode when the meter is in the relative mV mode This button only appears when the meter is in the relative mV mode The following buttons appear in all standardization screens 2 Confirm E Clear Cancel Temp Std la The Confirm button accepts current value of the buffer or standard solution The Clear button clears all previous standardization points The Cancel button cancels current standardization and returns to the measurement screen The Temp Std button allow you to check the accuracy of your temperature probe and standardize to an accurate thermometer accumet i ae CHANNEL ASSIGNMENT Using the Meter The XL50 features four channels Channels 1 and 2 can be set for a pH or mV electrode with a BNC connector Channel 3 can be set fo
52. ction from the conduction of current through metal which results from electron transport The conductance of a solution is pro portional to and a good though nonspecific indicator of the concentration of ionic species present as well as their charge and mobility It is intuitive that higher concentrations of ions in a liquid will conduct more current Conductance derives from Ohms law E IR and is defined as the reciprocal of the electrical resistance of a solution C 1 R C is conductance siemens R is resistance ohms One can combine Ohms law with the definition of conductance and the resulting relation ship is C E l is current amps E is potential volts In practice conductivity measurements involve determining the current through a small portion of solution between two parallel electrode plates when an ac voltage is applied Conductivity values are related to the conductance and thus the resistance of a solution by the physical dimensions area and length or the cell constant of the measuring elec trode If the dimensions of the electrodes are such that the area of the parallel plates is very large it is reasonable that more ions can reside between the plates and more current can be measured The physical distance between the plates is also critical as it effects the strength of the electric field between the plates If the plates are close and the electric field is strong ions will reach the plates more quickly than
53. d To set Print Criteria 1 Touch the Touch here to edit button next to the Print Criteria to access the mV Print Criteria Setup screen N Touch ON or OFF to change the status of a criteria you want to modify ao Repeat step 2 for all the remaining criteria except Print Option A For Print Option select between Log Data and Timed If Log Data is selected clicking on the Print button from the Measurement screen will send the logged data to the printer If Timed is selected you can print data at an interval you select This data is buffered and is sent to the printer when the page is full 5 Touch OK button to accept the changes of the entire group of print criteria and return to the mV Setup screen Toasch hero to edi m Print Gribe ia Sebup Das Tires f rare Samos Di Tera dius hater J Moda Sari Pe ne SOC Pant piim Set DATA STORAGE CRITERIA accumet excel gt This screen allows you to select which criteria are stored in the data logger with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be stored on demand To set Data Storage Criteria 1 Touch the Touch here to edit button next to the Data Storage Criteria to access the mV Data Storage Setu
54. d result in inaccurate measurements If the millivolt change is too small readability errors are enhanced See ISE Theory on page 128 Taking a Known Addition Measurement 1 Immerse the ion selective electrode in a known volume of the sample solution 2 Stir the sample 3 Wait for the reading to stabilize STABLE will appear Touch KA to take the first mV reading of sample 4 Add a known volume of standard solution to the sample 5 Wait for the reading to stabilize STABLE will appear Touch KA to take the second mV reading of sample Use the keypad to enter the sample volume Touch Enter to accept the value Use the keypad to enter the standard volume oOo ON O Touch Enter to accept the value 10 Use the keypad to enter the volume of ionic strength adjuster used If no ISA was used enter a value of zero 11 Touch Enter to accept the value 12 Use the keypad to enter the concentration of the standard solution added to the sample 13 Touch Enter to accept the value Your Known Addition result is now displayed 14 Touch Print to send the data to a printer or touch Log Data to log the data to memory if a sample ID has been assigned OR Touch OK to return to the Measure screen for a new measurement lon Operation accumet L ae KNOWN ADDIITON METHOD Ten Maisie ementi Channel 1 241 7 het Pisa creer rev Y Chamel 1 12 c Curae ton Method inoen addition fe Tah A
55. d OFF sccsidseisssias eurstsessietntegaianeen 91 GRAPHING FUNCTION 00 ccecsececceseesesceeeneeseeeees 92 mV Operation About mV MEASUREMENT 0 ccccccccecsesseseeeees 93 Absolute mV Measurement 0ccccccccesseseesceeee 9A Relative mV Standardization and Measurement ccccccecccesseseseeeeeeseeeee 94 GRAPHING FUNCTION 00ccccccccccceeessssceeeereees 95 lon Operation About lon MEASUREMENT ccccccccccecsesseeeeees DIRECT READING METHODS Standardization Direct Reading With Standlard s cccccccssessesscssessessseseeseesees 97 Measurement Direct Reading With Standlards cccccccccsecsessessescessseseeseesees 98 Standardization Direct Reading with Blank Offset ccccccccccscssessesceeesseteeeees 99 Measurement Direct Reading with Blank Offset ccccccccccccsesseseeeesseeees 100 INCREMENTAL METHODS 00000 cc000008 101 109 Standardization All Incremental Methods 101 Measurement Known Addition Method ooiceeccecceccecscscesesesseseeseeseeeseees 102 103 Measurement Known Subtraction Menoa mea asses ease 104 105 Measurement Analate Addition Method ooiceeccececcccsescesesesseseeseeseeeseees 106 107 Measurement Analate Subtraction Method ooien 108 109 GRAPHING FUNCTION 00cccccccccccseessseceeeeees 110 Conductivity Operation About Conductivity MEASUREMENT 2 0 0 111 STANDARDIZING ooososnnenessnenesersrerenenn 112 113 With Auto Buffer Recognition
56. display of the measurement screen p Picas mTl Fisher Scientific Sampip BO o f 20 Clot auta Rutter OM 0 Lan Stanchedewion TEAT un IO sf ees AN Lan Stowcheciewion RNY Desktop screen Home pH mV and pH FET triple measurement screen Using the Meter the Meter TOUCH SCREEN OPERATION accumet _ The new accumet XL50 benchtop meter operates with a state of the art touch screen The touch screen makes this the easiest meter on the market to operate and care for When the meter is first plugged in the meter runs a self test and takes you to the measurement screen Touch any icon to access the functions of the meter Your XL50 meter also includes a stylus that you can use to tap on your screen The stylus easily stores inside the back panel of the meter The buttons on the right side of the screen control all of the functions of the meter A light touch on the screen is all that you need to access the various functions Once you touch a button you will get an audible tone the screen will not change until you lift your stylus This design prevents rapid uncontrolled scrolling through the various function screens Function buttons and options change from screen to screen Easy to understand prompts guide you through the operation of the meter in the selected mode If you are ever in doubt about what to do just touch Help on the bottom right corner of the screen for detailed information about that screen Yo
57. e w EN Buer Agio AUTO HAJA drg Pard Hod ATO maaa pH Aabi oror Fast Micra Deit Tangeri 0 F janmaa Dara a mi TH 2 m Print Crterte Touch hwn fo oda Cars Sioa Cetera Touch han to cit Gedy oriei Tarh heen tn ect Function Buttons on pH Setup Screen Touch OK to confirm pH Setup and return to the pH Measure screen Touch Cancel to exit and return to the pH Measure screen without confirming pH Setup Touch View to view all pH data points stored in memory See pages 33 34 for details When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all pH Setup Criteria to the factory default To access the Setup screen 1 Make sure you are in the pH Measure screen either multiple display or single display see page 22 2 Touch the Setup button to access the pH Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change pH parameters select the pH Setup button DH Dip Ghana jen Setuc Ghar 7 Trie BURA If you were in single display mode you will access the Setup mode for the single channel displayed only pe beSup Ch
58. e corrected TDS measurement If an ATC probe is used any value entered as a default temperature will be overridden in favor of the actual meas ured temperature of the solution provided to the meter by the ATC probe The default temperature can be set from 10 C to 110 C The TDS Default Temperature is set the same way as previously described in Conductivity Setup See page 62 for instructions Daai Tareas To Set Reference Temperature This setup option allows you to select the reference temperature to be used in the determination of the TDS of your sample The reference temperature is the tempera ture to which the TDS readings would be normalized The reference temperature can be set from 15 C to 30 C The TDS Reference Temperature is set the same way as previously described in Conductivity Setup See page 62 for instructions Agieie TaTpa are F E accumet excel gt To Set Temperature Coefficient The temperature coefficient is a value that reflects the degree to which the sample s TDS is effected by temperature changes The meter will use the set temperature coeffi cient along with the measured temperature provided by the ATC probe to calculate what the TDS would be at the selected reference temperature If no ATC probe is being used the meter will use the set default temperature in the calculation The temperature coefficient can be set from 0 to 10 000 The TDS Temperature Coefficient is set the same
59. e option Any active criteria will be stored on demand To set Data Storage Criteria 1 Touch the Touch here to edit button next to the Data Storage Criteria to access the Conductivity Data Storage Criteria Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining criteria except Data logging Interval 4 For Data logging Interval touch MANUAL to log conductivity data only when the Log Data button is pushed touch STABLE to automatically log conductivity data when conductivity reading is stable or touch TIMED to set a specific timed interval in seconds to log conductivity data 5 Touch OK button to accept the changes of the entire group of data storage criteria and return to the conductivity Setup screen Cate Stee ier Touch hese to exit Ciia Tima Dhil mayen IL Caf C oretant Terrace Fakira Tarn Ternpercabiarn Gaaf Last Stomdardination Wier Medii Tena No Dpi Cem bop broke ma H THEMES Conductivity Setup Set DISPLAY CRITERIA accumet _ This screen allows you to choose what information you would like to be displayed on the conductivity Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the opt
60. e unit button C Celsius F Fahrenheit or K Kelvin 2 Touch the Reference Temperature box and use the numeric keypad to enter the desired default temperature 15 C to 30 C 3 Press Enter in the keypad to return to conductivity Setup screen Rpke Taaricen ature Note The units of all temperature parameters must match The meter will automatically modify the temperature units of Default Temperature and Reference Temperature to match the last choice made on any of these parameters accumet excel gt Set TEMPERATURE COEFFICIENT Set ALARM LIMITS ETTET Setup Set Temperature Coefficient The temperature coefficient is a value that reflects the degree to which the sample s conductivity is effected by temperature changes The meter will use the set temperature coefficient along with the measured temperature provided by the ATC probe to calculate what the conductivity would be at the selected reference temperature If no ATC probe is being used the meter will use the set default temperature in the calculation The temperature coefficient can be set from 0 to 10 000 To set Temperature Coefficient 1 3 a ae eee Touch the Temperature Coefficient box and use the numeric keypad to enter the desired default temperature 0 to 10 000 Press Enter in the keypad to return to conductivity Setup screen ii NOTE The meter and probe with ATC will measure temperature even if the temperature coeffici
61. eabenscutagartdevednieereaniadesedeassalees 138 620 710 accuFet XL flat tip GlectrOdesccscss ses stgeczee Soedess coseebacet ceived et bachezyesiiekaaezeth ee seceeeshi be bee tiberesaerseneaetieeuee 138 620 720 accuFet XL lance tip electrode 0 ccecsceeeescceeeeeceeeeeeeeeenaeeeeeaaeeeeaaeeeesaaeesesaeeeseaaeeessaaeeeesaaeenseaeeseeaaeees 13 620 730 Calibration Certificate Fisher Catalog Number NIST pH meter calibration certificate ccscsssssrscstssssrsosscesesssoessonscnesesoesonssessessosesseessoesonsesonseeseesees 15 094 28 pH Buffers and Solutions pH Color Description Ingredients Size Fisher Catalog Number 4 00 Red Potassium Biphthalate 500 mL SB101 500 7 00 Yellow Potassium Phosphate Monobasic 500 mL SB107 500 10 00 Blue Potassium Carbonate Potassium 500 mL SB115 500 4 00 Individual Tear open pH Packets 20 box 13 300 150 7 00 Individual Tear open pH Packets 20 box 13 300 149 10 00 Individual Tear open pH Packets 20 box 13 300 148 Fisher BufferPac pH 4 00 7 00 and 10 00 buffers 3 x 500 ML cccesceeececeseceeeeeeeeeeeeeeeeeeaeeseeeeeaeeeeee SB105 Individual Tear open pH Packets assortment 5 each of pH 4 00 7 00 10 00 and rinse packets 2O DOX inisenisi aaaeaii atear castestnivnisstsaseesaiasar este vanetasenenetet eet aated 13 300 147 Electrode Rinse Individual Tear open PH Packets 20 D0X eceeseeseeeeeeeeeeeeeseeseaeeeeneeeeeseeneeneees 13 300 180 Electrode storage solution 1 L To place an order
62. eading when the meter recognizes it as stable The meter will not deviate from this reading until Measure is touched If the Auto Read function is inactive then the meter will contin uously monitor the pH of the sample and the Measure screen display will indicate any fluctuation in the sample pH To select Auto Read Mode 1 Touch MANUAL or AUTO to choose the desired read mode Ato Fei Mode p seme Set pH STABILITY CRITERIA Set DEFAULT TEMPERATURE accumet excel gt Set pH Stability Criteria This setup screen allows you to determine how quickly the meter will respond to electrode drift There are three speed settings fast medium and slow To set pH Stability Criteria 1 Touch FAST MEDIUM SLOW to choose the desired stability criteria ty pH Stabi Griera MEDIUM o SLON Stability criteria are more stringent at the slower setting Therefore if the highest precision is required then a slow setting would be desired The default setting is the FAST and this should be adequate for the majority of applications without making any changes Set Default Temperature It is a well known fact that pH is a temperature dependent measurement The factory default setting is 25 C If you are measuring the pH of a solution that is not 25 C and you are not using an Automatic Temperature Compensation ATC probe then you should enter the temperature value of that solution in order to get the correct pH value The current de
63. ed with your personal computer through Microsoft Active sync accumet excel gt accumet excel gt ON SCREEN KEYBOARD Using the Meter Using the On Screen Keyboard Use the stylus to tap letters numbers and symbols on the on screen keyboard to enter typed text directly onto the screen 1 From any application screen tap the bottom right of the screen to access the input panel Tap the Pencil Keyboard icon see below A pop up menu will appear 2 Tap LargeKB to display a large keyboard with all function keys Tap keyboard for a basic function alphanumeric keyboard 3 Tap desired letters numbers and symbols on the keyboard Hit the enter key 4 To remove keyboard tap on Pencil icon The pop up menu will appear Tap Hide Input Panel to remove keyboard AL szsem 2 7 a S25PM i To see symbols tap the Shift key Using the Meter EXPANSION CARD accumet _ Expansion Cards You can expand the memory and connectivity of your XL50 meter Use optional expansion cards for e Expanding the memory of your XL50 meter e Viewing the content of memory cards Expansion cards must be purchased separately and are not included with your XL50 meter Installing an Expansion Card To install a Secure Digital SD card into an expansion slot on the XL50 meter 1 Locate the slot on the top of XL50 meter 2 Remove the protective plastic card 3 Insert the expansion card into the expansion slo
64. elete All to delete all the data point in the memory Touch Print to print all the data points in the memory See next page for Export View and Header explanation Export View ad Houska TEE E accumet esse ey View STORED DATA mV Setup Touch Export View and Header to save your data in HTML format The file can be stored in either the Nand flash SD Card or any of the other available locations as shown in the window After having selected the path touch the alphanumeric keypad to name your file teary oom me Dateline Channel 13 Jen 200e 6 50 25 AML 6 133 5 7 dan 2003 2052 aMyCh1 6 750 18000 6 Jan 2002 14 04 AMjCh1 5 25 0 390 0 6 Jan 02 1210 aMych1 3 25 0 1800 9 le Jan 2002 S1243amjon 2 25 0 oo e n 2002 SISSA 1 25 0 Touch the alphanumeric keypad to name your file Export view in HTML format The lon Setup screen presents many options to control the operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 121 for default settings The operating parame ters of the lon mode can be set and controlled from the lon setup screen The lon Setup section will guide you through the various options available in the lon setup mode Eal ion beie thirra pH Setup charred HARJAL lon Petree Bece Tys irene iiri tn Amad Hode lon tiiir Cimi Catt Tapara Apph Terpau
65. ent is set to 0 0 however a temperature correction will not be applied to the measurement Set Alarm Limits This option allows you to set alarm limits for the conductivity measuring mode If the conductivity value of the measurement is outside of the boundaries set by the mini mum and maximum limits audible and visual warnings will let you know that your sample measurement was outside of the set limits The Alarm Limit can be set from 0 0 uS to 500000 00 uS To set Alarm Limits 1 2 3 Touch ON or OFF to set the status of the alarm of conductivity mode Touch the Low box and use numeric keypad to enter the new limit values Touch Enter on the keypad to accept this limit and return to the conductivity Setup screen Touch uS or mS to select conductivity units of low alarm value Touch the High box and use numeric keypad to enter the new limit values Touch Enter on the keypad to accept this limit and return to the conductivity Setup screen Touch uS or mS to select conductivity units of high alarm value ls m Laws Conductivity Setup Set PRINT CRITERIA accumet This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed
66. er asain gt gt Touch stancdurdire mon to aomas standarirtion mode gt Touch Clear to elonr tho provious Standardization Tench Conee to return to the Mens uroment sey GY gt Touch Temp Std for Toempemturs Stondardznotion Tome 255C Ic Sampie i _ 25 5 ATC mV 40 User ID gt Detiuk 2857 Steps Auto Butter ON 102 8 32A oW pH calibration screen with Auto Buffer Recognition Once the meter is calibrated the pH Measure screen shows the buffers that have been standardized and last standardization time date 88 accumet i ere STANDARDIZING pH Operation To standardize the meter with Manual Buffer Recognition The Manual mode requires a minimum two point calibration When you press the Enter key after the first calibration point a message appears Minimum 2 buffers need to be standardized to apply the standardization in measurement 1 Make sure Manual Buffer Recognition is selected in the Setup screen 2 Immerse your rinsed electrode s and temperature probe in a buffer solution from the selected buffer group that you chose during the pH setup process and Stundantize Stir gently The selected buffer group appears on the standardization screen 3 Touch Standardize on the Channel 1 2 or 3 pH measure screen to access the standardization screen 4 Touch Clear if necessary to delete all previous standardization values If the If there is alae previous screen
67. er dual display or single display see page 22 2 Touch the Setup button to access the resistivity Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change Resistivity parameters select the Resistivity Setup button E Arit Setup DH Setup Chanel i ni Setup Charred 7 moion MAMUAL Bao HOHE pH Setup Gama l Go Reitit Setup Tees D If you were in single display mode you will access the Setup mode for the single channel displayed only See page 23 for pH setup directions See page 35 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity setup directions accumet excel gt To Set Sample ID A sample ID is required if you wish to log data or activate a timed printing Whenever this option is active each time you touch Log Data on the resistivity Measure screen the resis tivity value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID The resistivity Sample ID is set the same way as previously
68. ers you must log in using the admin user ID Admin iags The BS key will allow you to backspace to remove a character that was incorrectly entered Press the Enter key 4 Touch the Password box use the alphanumeric keypad on the screen to key in the password NOTE When entering the User Profiles setup for the first time use admin as the Password Press the Enter key The User Login screen will appear with User ID and Password entered 5 Touch Login to enter the User Profiles screen From this screen you can update Password and Company Name information by tapping in the appropriate boxes if you are logged in as a user If you are logged in as Admin user ID you can add and delete users Adding User Profiles 1 After logging in under User ID admin the User Detail fields will show information for Admin Touch Clear to clear all information from the User detail box to enter a new user You can now begin entering information for new users 2 Touch the User ID box use the alphanumeric keypad on the screen to key in the new User ID The User ID cannot exceed 10 characters Press Enter key to confirm User ID 3 Touch the Password box use the alphanumeric keypad on the screen to key ina Password The Password cannot exceed 12 characters Press Enter key to confirm Password 4 Touch the Confirm Password box use the alphanumeric keypad on the screen to key in the same password used in step 3 Press Enter key to confirm Pa
69. es step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all TDS Setup Criteria to the factory default To access the Setup screen 1 Make sure you are in the TDS Measure screen either dual display or single display see page 22 2 Touch the Setup button to access the TDS Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change TDS parameters select the TDS Setup button mv fetus Chae pd Seto Chere z GO TOS Stue Saek Cs AAD DH Set Channel ES TES Setun If you were in single display mode you will access the Setup mode for the single channel displayed only See page 23 for pH setup directions See page 35 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity setup directions accumet excel gt To Set Sample ID A sample ID is required if you wish to log data or activate a timed printing Whenever this option is active each time you touch Log Data on the TDS Measure screen the TDS value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for
70. ethod where the ion of interest in the sample is not identical to the ion in the standard solution The standard of known ion concentration that is added to the sample quantitatively reacts in the sample with the ion of interest This reaction removes a fixed amount of the ion of interest from the sample solutions The ion concentration is then calculated based upon the difference in the mV potential Analate Addition A modification of the known addition method The initial mV measurement is recorded in a standard solution The ion in the standard solution is the ion of interest and is detected by the ion selective electrode in use A sample containing the ion of interest is then added to the standard solution The difference in the mV potential is then used in the calculation of the concentration of the ion of interest This method is useful if the sample temperature is significantly different than that of the standard When the small volume of hot sample is added to the larger volume the temperature impact becomes negligible Analate Subtraction Useful when there is no ion specific electrode available to directly measure the concentration of the ion of interest This method employs the addition of a sample of the ion of interest to a standard containing a different ion of known concentra tion The ion of interest will quantitatively react with the ion in the standard creating a complex and removing the ion from the standard solution The ion spec
71. ethods yield approximate pH values often with an accuracy of plus or minus 0 5 pH units The preferred and most accurate way to measure a pH value is the potentiometric measurement using a pH electrode a reference electrode and a pH meter This method is based on the fact that certain electrodes immersed in solution produce a millivolt potential i e voltage that is related to the hydronium ion concentration or pH of a solution in a precise way The relationship between the electrode s voltage and the solution pH is defined by the Nernst equation 2 3RT Emeas E nF pH In this equation Emeas is the voltage output of the electrodes E is the total of all other voltages in the system including the reference voltage R is the Gas Law constant T is the temperature in Kelvin n is the charge on the hydronium ion 1 and F is the Faraday constant pH Meter The pH meter is a sensitive voltmeter capable of accurately measuring small voltage differences between the pH electrode and the reference electrode This voltage difference is amplified and shown as a pH reading Almost all modern meters are microprocessor controlled and programmed to use electrode voltages efficiency and temperature to calculate an accurate pH for the sample Since the voltage output from different electrodes will vary it is essential to calibrate a pH meter The ability to calibrate or to standardize a pH meter permits the meter to match the pH read
72. etup directions accumet excel gt To Set Sample ID A sample ID is required if you wish to log data or activate a timed printing Whenever this option is active each time you touch Log Data on the salinity Measure screen the salinity value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID The Salinity Sample ID is set the same way as previously described in Conductivity Setup See page 59 for instructions Tarps D To Set Calibration Point s This option also allows you to choose single point or multi point standardardization Use the single point standardization option if you are measuring samples that close in value Use the multi point standardization option if you are measuring a wide range of samples If a single point calibration is selected there will be only one calibration factor for the entire range of operation In the multi point mode there will be one for each of the 4 ranges To select Calibration Point s 1 Touch Single Point or Multi Point to choose the method of standardization Dab aion Pont To Select Stable Indicator This setup option lets you turn ON or OFF the stability indicator When this function is turned on the STABLE appe
73. f ion measurement You can directly read the concen tration of the sample after standardizing the meter with ion standards An ionic strength adjuster ISA is added to both the standards and the sample Two to five standards are used to standardize the meter The standards should bracket the expected value of the sample To Standardize the Meter Using Direct Reading with Standards You must use a minimum of two standards to standardize the meter Make sure you have selected Direct Reading with Standards on the lon Setup screen 1 Add ionic strength adjuster to your standard 2 Immerse your rinsed electrode s into the standard solution and stir gently 3 Touch the Standardize button on the lon Measure screen to access the standardization screen 4 Touch Clear if necessary to remove a previous standardization If the screen says Not Standardized proceed to step 5 5 The screen will flash each standard icon once then a numberic keypad will appear Using the displayed keypad input the value of the standard that you are using to standardize the meter Touch Enter to accept this value The meter now shows the value of the standard solution in the flashing beaker 6 Wait until Stable appears on the screen Press Confirm button once to confirm the standardization To manually override the stability requriement press Confirm before the stable message appears after the ion beaker starts flashing with the standard value 7 T
74. fault temperature setting will be displayed on the screen The default temperature can be set from 5 C to 105 C To set Default Temperature 1 Select temperature units by touching the appropriate unit button C Celsius F Fahrenheit or K Kelvin 2 Touch the Default Temperature box and use the numeric keypad to enter the desired default temperature 5 C to 105 C 3 Press Enter in the keypad to return to pH pH FET Setup screen Ceim Terran The use of an ATC probe provides a measured temperature value to the meter and will override any value entered in the default temperature screen This measured value will be used by the meter to make pH calculations accumet Set ISOPOTENTIAL POINT Set ALARM LIMITS pHseup excel gt Set Isopotential Point The isopotential point is the millivolt reading for an electrode at which temperature has no effect on the measurement pH electrodes are constructed so that the isopo tential point is theoretically zero millivolts This is very close to a pH of 7 Most pH electrodes do not achieve this value precisely However they are close enough so that it is not usually necessary to use an isopotential point other than zero The true isopotential point of any given electrode must be determined experimentally See Appendix Determining Isopotential Points Experimentally page 58 The isopotential point can be set from 100 to 100 To set Isopotential Point 1 Touch the I
75. for which the membrane is selective For example the fluoride electrode can be used to directly sense fluoride ion in drinking water Analyses utilizing ion selective elec trodes offer the advantages of speed ease of operation low cost and versatility over other analytical techniques The ISE can measure the ion concentration of samples at very high levels gt 1000ppm to very low levels lt 1ppm When an IS the indicator electrode and a reference electrode are placed in a solution and connected to a pH mV ion meter they form a potentiometric cell At equilibrium the meter measures the potential difference between the ISE and the reference electrode This millivolt potential is proportional to the activity of the ion of interest and the relation ship is defined by the Nernst equation RT E E 2 3 loga here 2 3 75 log a w E is the measured potential E is the sum of the standard potential and all other constant potentials of the system R is the gas constant T is the temperature in K F is Faraday s constant n is the valence of the ion being measured Activity a is not the same as concentration It is a thermodynamic function whose value is influenced by the ionic environment in which the ion exists Activity and concentration are the same in very dilute ideal solutions In non ideal solutions activity and concentra tion are related by an activity coefficient ISEs sense the activity of
76. free uncomplexed ions rather than concentration However by calibrating the meter with standards with a similar ionic back ground as the sample the difference between activity and concentration becomes negligible Most often this is achieved by adding an ionic strength adjustor to both samples and standards The Nernst equation becomes igi PI E E 2 3 nF log c where c is the concentration of the ion of interest This form of the Nernst equation states that the electrode potential varies directly with the log of the concentration in straight line manner and results are then expressed in the pre ferred concentration units The slope of the line is equal to the value of Slope S 2 3RT nF The table below gives theoretical slope values at 25 C Slope Slope Species mV decade Species mV decade Monovalent cation 59 16 Divalent cation 29 58 Monovalent anion 59 16 Divalent anion 29 58 The Nernst equation thus reduces to E E S log c lon selective Analysis Methods Direct Analysis In this method a sample concentration is determined by measuring the electrode potential and comparing to those obtained in standard solutions Normally an ionic strength adjus tor and or pH adjustor must be added to both the samples and the standards This helps in that the closer the standard solution matrix is to the sample matrix the more valid is the analysis A number of standard solutions are used to standardize a pH m
77. from the Desktop Home page and single click in the XL50 application Drag Place the point of the stylus on the screen and drag an item across the screen with out lifting the stylus until you have completed the selection Dragging is equivalent to dragging with the left mouse button pressed on your personal computer Stylus Calibration If your insturment is not responding properly to your taps you may need to recalibrate your screen 1 From the HOME screen tap the bottom left of the screen to access the Start menu Tap Start gt Settings gt Control Panel This launches the Control Panel screen Tap the Stylus icon twice Tap the Calibration button to access the calibration screen Tap the Recalibrate button a fF O ND Carefully press and briefly hold the stylus on the center of the target Repeat as the target moves around the screen If you miss the target center keep the stylus on the screen slide it over the target s center and then lift the stylus 6 Once the calibration is complete the target cursor will disappear Tap anywhere in the screen to go back to the Stylus Properties window Tap OK to close the Stylus Properties window CAUTION To prevent damage to your XL50 screen never use any device other than the stylus that comes with the meter or an approved replacement to tap on the screen Order extra or replacements if you lose or break your stylus Using the Meter the Meter
78. guration Data configuration Buffer Group Sample ID Isopotential Point Print interval Display resolution Auto Buffer Recognition Auto Read Mode Temperature Units Default Temperature Stability Criteria Default Slope Alarm limits Alarm limit low Alarm limit high All parameters ON All parameters ON All parameters ON USA None 0 mV manual X XX ON MANUAL Celsius 25 degree Celsius Fast Not Applicable OFF 2 pH 20 pH mV Setup Mode Display configuration Print configuration Data configuration Sample ID Print interval Display resolution mV Readings Alarm limits Alarm limit low Alarm limit high All parameters ON All parameters ON All parameters ON None Manual X Absolute mV OFF 2000 mV 2000 mV Appendix Factory DEFAULT SETTINGS Screen lon Setup Mode Display Configuration Print Configuration Data Configuration Sample ID lsopotential Point Print Interval Display Resolution Auto Read Mode Temperature Units Default temperature Stability Criteria Default slope ISE method Units Electrode Alarm limits Alarm limit low Alarm limit high Conductivity Setup Mode Conductivity Standards Standard Recognition Alarm Limit Low Alarm Limit High Resistivity Setup Mode Alarm Limit Low Alarm Limit High TDS Setup Mode TDS Factor Alarm Limit Low Alarm Limit High Salinity Setup Mode Alarm Limit Low Alarm Limit High accumet excel gt Default Setting All
79. he electrode in use The slope value is required in the incremental method calculations which yield the ion concentration of the sample See ISE Theory on page 128 Make sure you have selected one of the incremental methods known addition known subtraction analate addition or analate subtraction in the lon Setup screen 1 Add ionic strength adjuster to the standards 2 Immerse the ion selective electrode in the stirring standard Always begin standard ization with the least concentrated ion standard 3 Touch Standardize to initiate standardization 4 Use the keypad to enter value of the standard 5 Touch Enter on the keypad to accept this value If you have entered value in error touch BS to clear the value and key in a new value 6 The meter accepts the value and the standard icon starts blinking When the Stable icon appears on the screen press the Confirm icon to confirm the standardization 7 Repeatwith additional standards up to five See pages 102 103 for Known Addition Measurement See pages 104 105 for Known Subtraction Measurement See pages 106 107 for Analate Addition Measurement See pages 108 109 for Analate Subtraction Measurement lon Operation KNOWN ADDIITON METHOD accumet Measuring Concentration in Samples Using the Known Addition Method When performing known addition you will add an aliquot of standard solution containing the ionic species of interest to a known volume of your sample The m
80. he salinity Measure screen Touch Cancel to exit and return to the salinity Measure screen without confirming salinity Setup Touch View to view all salinity data points stored in memory See page 86 for details When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all salinity Setup Criteria to the factory default G Salinity Setup Access SALINITY SETUP accumet To access the Setup screen 1 Make sure you are in the salinity Measure screen either dual display or single display see page 22 2 Touch the Setup button to access the salinity Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change Salinity parameters select the Salinity Setup button mv Seto Chanel g pe Saup Charred 2 GO Siniy Set Terie ID DH Setup Gama 1 bel Sany Sup Terese D If you were in single display mode you will access the Setup mode for the single channel displayed only See page 23 for pH setup directions See page 35 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity s
81. hen touch the Delete button Touch Delete All to delete all the data point in the memory Touch Print to print all the data points in the memory See next page for Export View and Header explanation Export View aii Hoad E E T lon Setup VIEW STORED DATA accumet Touch Export View and Header to save your data in HTML format The file can be stored in either the Nand flash SD Card or any of the other available locations as shown in the window After having selected the path touch the alphanumeric keypad to name your file ids onw r en a ee m t Cefsut 28 Il Site 7 S 0 e 4 22 20 AMI Cefauit matela alala ls la 7 lalan le cH 26 J 2004 f 4 0C Tag allele lt ele lila ay o piaz AML efast Car als d a aln plk u er ren e 9 pinim 1 14 IC RES Sa J cule TiT e Touch the alphanumeric keypad to Export view in HTML format name your file accumet i ae CONDUCTIVITY SETUP SCREEN Conductivity Setup The conductivity Setup screen present many options to control the operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 122 for default settings The operating parameters of the conductivity mode can be set and controlled from the conductivity setup screen The conductivity Setup section will guide you through the various options available in the conductivity setup m
82. ibed in Conductivity Setup See page 64 for instructions Print Griek Taah hs lip eat NOTE The meter and probe with ATC will measure temperature even if the temperature coefficient is set to 0 0 however a temperature correction will not be applied to the measurement accumet excel gt To Set Data Storage Criteria This screen allows you to select which criteria are stored in the data logger with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be stored on demand The TDS Data Storage Criteria is set the same way as previously described in Conductivity Setup See page 65 for instructions Cate Sinaga bia Touch hat to ait To Set Display Criteria This screen allows you to choose what information you would like to be displayed on the TDS Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option The TDS Display Criteria is set the same way as previously described in Conductivity Setup See page 66 for instructions Coplay Hmi Touch hes i
83. ific electrode is specific for the ion in the standard solution and not for the ion of interest The difference in mV potential is used to calculate the concentration of the ion of interest based upon this quantitative reaction To select lon Method 1 Touch the Arrow key to the right of lon Method 2 Touch the desired method ton setup ELECTRODE TYPE MEASUREMENT UNITS accumet excel gt Changing electrode type will erase the previous standardization Select Electrode Type This screen lets you select the type of electrode that is specific for your ion of interest Your choice of electrode informs the meter which default slope to use in the calculations made for electrode efficiency and sample concentration Once you have selected an electrode you will not be required to enter the default slope numerically Note the default slope value specific for the electrode that you choose is a theoretical slope value that is used in the calucaltions to determine the efficiency of your electrode This slope value is not the slope value that is displayed in the data box of the measure ment screen You will still need to standardize the meter using ion standards to determine the actual efficiency of your electrode To select electrode type 1 Touch the Electrode Type box to view the list of electrodes 2 Use the scroll bar to select the desired electrode type ava i If you are using several different electrode
84. in Conductivity Setup See page 64 for instructions Prin Criteria Tah ha tk ait Salinity Setup Salinity Setup accumet excel gt To Set Data Storage Criteria This screen allows you to select which criteria are stored in the data logger with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be stored on demand The Salinity Data Storage Criteria is set the same way as previously described in Conductivity Setup See page 65 for instructions Dia Snorage Crea Touch haste to edit To Set Display Criteria This screen allows you to choose what information you would like to be displayed on the salinity Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option The Salinity Display Criteria is set the same way as previously described in Conductivity Setup See page 66 for instructions Dipi timi Touch hes ox ali To View Stored Data The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to sort and
85. ing Operator Date Time Channel Sample Id Temperature Last Standardizations Meter Model Serial No Viewing Stored Resistivity Data is done the same way as previously described in Conductivity Setup See pages 66 68 for instructions Charmed The TDS Setup screen present many options to control the operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 122 for default settings The operating parame ters of the TDS mode can be set and controlled from the TDS setup screen The TDS Setup section will guide you through the various options available in the TDS setup mode my Seu Chanel l pH Setup Charred 2 E Ths Setup Taroa Di pert Tey SPCC NENE Tibat Gort finge Point Mifi Peint Teale rik Biri Pimoscl oN OFF Hada MUTO Cell cosa D ji TEE Faig Chimi Tener Aging Tare ue Tampere cette aber Lis Fink sCritgeiy Touch hit to exit Data Shore Dieis Touch haere to mt Cipi Criteria Touch hap toe kt Ex 9 Eom Cord Ene Coed Function Buttons on TDS Setup Screen Touch OK to confirm TDS Setup and return to the TDS Measure screen Touch Cancel to exit and return to the TDS Measure screen without confirming TDS Setup Touch View to view all TDS data points stored in memory See page 80 for details When you touch the Help button information about the current screen appears This information includ
86. ing on the meter with the known pH value of a buffer solution For best accuracy it is recommended that at least two buffer solutions be used to calibrate a pH meter Buffer solutions are available as ready to use solutions concentrated solutions capsules or prepackaged salts The following table lists three of the most widely used NIST buffers along with their pH values at different temperatures Temperature 4 01 6 86 9 18 0 4 003 6 984 9 464 10 3 998 6 923 9 332 20 4 002 6 881 9 225 25 4 008 6 865 9 180 30 4 015 6 853 9 139 40 4 035 6 838 9 068 50 4 060 6 833 9 011 pH Electrodes The electrode system consists of two half cells a pH indicating electrode which is primarily responsive to the acidity the hydronium ion concentration tion of a solution and a reference electrode which provides a constant voltage and completes the electrical circuit Traditional pH indicating electrodes use a tip made of pH sensitive glass Inside this electrode is a buffer solution with a fixed pH and ionic strength A silver wire coated with silver chloride is immersed inside this internal solution and establishes electrical contact between the solution and the meter The voltage associated with this wire and the voltage associated with the pH of the internal solution and the inside wall of the pH sensitive glass tip remain constant Therefore changes in voltage from this electrode result from the voltage developed between the solution
87. inity is a temperature dependent measurement This option allows you to select a default temperature that the meter will use along with the temperature coefficient to calculate a temperature corrected salinity measurement If an ATC probe is used any value entered as a default temperature will be overridden in favor of the actual meas ured temperature of the solution provided to the meter by the ATC probe The default temperature can be set from 10 C to 110 C The Salinity Default Temperature is set the same way as previously described in Conductivity Setup See page 62 for instructions To Set Reference Temperature This setup option allows you to select the reference temperature to be used in the determination of the salinity of your sample The reference temperature can be set from 15 C to 30 C The Salinity Reference Temperature is set the same way as previously described in Conductivity Setup See page 62 for instructions ipirece Tarpa tur To Set Temperature Coefficient The temperature coefficient is a value that reflects the degree to which the sample s salinity is effected by temperature changes The meter will use the set temperature coefficient along with the measured temperature provided by the ATC probe to calculate what the salinity would be at the selected reference temperature If no ATC probe is being used the meter will use the set default temperature in the calculation The temperature coefficient can
88. ion To set Display Criteria 1 Touch the Touch here to edit button next to the Display Criteria to access the Conductivity Display Criteria Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining criteria 4 Touch OK button to accept the changes of the entire group of display criteria and return to the conductivity Setup screen Cecelia Craigi Tomah beste ton ei Conductivity Display Criteria Setup Micssurnort tl lasteraar Geta Serena 101 Standard Racog al Thor inert taal Typa Tarr oka Rela mnoa Termeni Tarps Canal Stench Parts Fis accumet Zn ecem View STORED DATA Conductivity Setup The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to sort and look at specific data points stored in the meter based on the meters memory capacity The stored data can be sorted by any of the parameters available in the screen header The meter stores conductivity data under the following parameters Reading Operator Date Time Channel Sample Id Temperature Last Standardizations Meter Model Serial No To View Stored Data 1 Touch the View button in the conductivity Setup screen You can only log 1000 data points at a time To clear space for new data points you have to delete the same number of old data points as you want to add new data points Function buttons on View Stored Da
89. ion will give your meter multiple standardization factors Conductivity StandardizeuS Channels 100 1 STABLE Last Stun cercisation LE Shancdancineter Standhrd Reoogrion MANUAL Erdi ecm MAN dardize the buffer he provious Standardization gt Touch shandandined inen to acon thandandination mock to the Mens urement Shore Graph lompemture Stondardantion Sample ID Tomp 25 5 C ATC Sample 1 2 Temp 0C Derfsult User ID Dotonlt Rot Temp 25 06 er 10 Dola hH Tene 330 C Std Recogn MANUAL Std Points Single Point Stel pecon MAMMAL Pent Pa Col K 21 000 fem Coothecient 0 000 2 Call E 600 fom Oie 1b SAC Coli Typo 4 Coll Ronge sT Sel fm tye 4 Cee EENE 7 Std Fretor 0 0800 ea ee Dhj farke OO Conductivity standardization with Once meter is calibrated the conductivity Manual standard recognition Measure screen shows the standards and the time date of last standardization 113 Conductivity Operation OCG TEMPERATURE STANDARDIZATION accumet _ To Standardize Temperature of the Meter 1 Touch Standardize on the conductivity measure screen to access the standardized screen 2 Make sure conductivity cell with built ATC is attached to meter 3 Immerse your conductivity cell with built ATC probe into a solution of known temperature such as a temperature bath for a few minutes while temperature stabilizes 4 Touch Temp Std to access temperature stand
90. irm to standardize the buffer The meter will then return to the conductivity measure screen 6 If you selected Single Point in the Setup mode Calibration Point s your meter is now ready to measure conductivity with one standardization factor OR If you selected Multi Point in the Setup mode Calibration Point s touch Standardize on the conductivity measure screen to access the standardization screen and repeat steps 4 through 6 to standardize with up to 4 points Performing a multi point calibration will give your meter multiple standardization factors CO iin a I a e a ere 5 i Corchocliv ity in majem Chamel 1 413 5 TABLE Touch Confira to Standardize the baer Touch shandandined ken te aonn tbarrainn mode gt Touch Thar i cea the pirimi Standoardications gt Tarh Canc to raban fo the Moar rr Tadh Tae Sod for Temperate Hordi i Tomm 0i ology k D o Tap SOE ay aiD fat Ral Tenn Fe moe Rai Terre 250 C Auto Buffer Sbd Ponies Multi Pont Parts i aiiLPoinis tie Point E i MED Ae Confficient 200 Oooo 0E Lajo oeiia LC AC alee caon kanga F of oa ry Ban z Ebd Factor Iann 4 Std Farke Oa Conductivity standardization Once meter is calibrated the with Auto standard recognition conductivity Measure screen shows available in Conductivity Mode only the standards and the time date of last standardization 112 accumet ivi i Hiin TR STANDARDIZING Conductivity Ope
91. isplays Access the Display Setup button from the Mode screen when multiple channels are selected To configure the display 1 Touch the desired Display box Display 1 2 or 3 2 Touch any one of the three Channel boxes to the right of the display box to assign the channel to the selected display 3 To reassign any of the displays touch the Display box again and the allocation clears Touch the M Channel button to save the configuration and return directly to the Measurement screen Touch the OK button to save the display configuration and return to the Mode screen Touch the Cancel button to exit and return to the Mode screen without saving changes When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Select display number by touching then boo to thee bft arci the eer bex Eo regi Enigi bo her ot Danae f Charl 5 Touch thet option im then Jagd to Day 1 nghi The pH Setup screen presents many options to control the pH operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 121 for default settings The pH Setup section will guide you through the various options available in the pH setup mode Sarno E fatter Gro fA Lach ly mi oo in
92. ivity Setup See page 62 for instructions To Set Reference Temperature This setup option allows you to select the reference temperature to be used in the determination of the resistivity of your sample The reference temperature is the temperature to which the resistivity readings would be normalized The reference temperature can be set from 15 C to 30 C The Resistivity Reference Temperature is set the same way as previously described in Conductivity Setup See page 62 for instructions Hemera Tarpa eune To Set Temperature Coefficient The temperature coefficient is a value that reflects the degree to which the sample s resistivity is effected by temperature changes The meter will use the set temperature coefficient along with the measured temperature provided by the ATC probe to calculate what the resistivity would be at the selected reference temperature If no ATC probe is being used the meter will use the set default temperature in the calculation The temperature coefficient can be set from 0 to 10 000 The Resistivity Temperature Coefficient is set the same way as previously described in Conductivity Setup See page 63 for instructions Taner hire D accumet excel gt To Set Alarm Limits This option allows you to set alarm limits for the resistivity measuring mode If the resis tivity value of the measurement is outside of the boundaries set by the minimum and maximum limits audible and visual
93. ization screen The screen will flash each standard icon once then a numberic keypad will appear Using the displayed keypad input the value of the standard that you are using to standardize the meter Touch Enter to accept this value The meter accepts the value and starts blinking When the Stable icon appears on the screen press the Confirm icon to confirm the standardization If you touched BLANK 7 The meter will return to the lon Measure screen and a beaker icon labeled blank will be displayed The blank value will be displayed on the bottom display panel Repeat if the meter has not been standardized with at least 2 standards of known ion concentration lon Standardization Tou have selected the Threat Reading Wits Blank sar lon standardiganion arthed le tes Beading STANDARD 29 GLAWE 7 thew Zimna Glank Oli 2 ANRIA OFF ion Typa Auto Amai lon Operation DIRECT READING METHODS accumet ioe 100 Measuring lon Concentration in the Direct Reading with Blank Offset Mode With Auto Read on 1 Add ionic strength adjuster to the samples 2 Immerse the ion selective electrode in the stirring sample 3 Touch Measure When the meter recognizes the reading as stable STABLE will appear on the screen The value that appears on the screen is the value of the sample minus the value of the blank reading The measure screen will fix on this measurement and will not deviate until meas is touched
94. l requirements output from PSU line voltage tolerance input impedance meter size meter weight 0 1 1 0 10 0 to 500 mS cm over 4 ranges 0 to 200 0 uS 200 0 US to 2 000 mS 2 000 to 20 00 mS 20 00 to 500 0 mS 3 ohm cm to 100 megohm cm over 4 ranges 0 to 20 00 KOhms 20 00 to 200 0 KOhms 200 0 KOhms to 2 000 MOhms 2 000 to 100 0 MOhms 0 0 to 500 0 ppt over 4 ranges depending on the TDS factor 0 to 200 0 x TDS factor ppm 200 0 x TDS factor to 2000 x TDS factor ppm 2 000 x TDS factor to 20 00 x TDS factor ppt 20 00 x TDS factor to 500 0 x TDS factor ppt 0 to 90 ppt over 4 ranges 0 to 0 094 ppt 0 094 to 1 000 ppt 1 000 to 11 50 ppt 11 50 to 90 00 ppt 0 5 of full scale 1 digit 5 0 to 105 0 C 0 1 C 0 2 C BNG Pin ATC DIN for FET DIN for conductivity 115 V 60 Hz 230 V 50 Hz 9VDC 3 3A center negative 10 gt 10 12 ohms 6 75 x9 25 x3 5 2 8 Ib Operating Conditions Conditions operating temperature operation humidity maximum operating altitude installation category Pollution category degree 5 45 C 5 80 noncondensing 2000m II 2 excel gt accumet _ CONNECTORS Getting Started a Review the layout and arrangement of the rear connector panel Stylus accuFET ISFET pH electrode Power Channel 3 RJ 45 Automatic Temperature USB B Compensation ATC Channel 1 Ver 1 1 USB A Reference pin jack Channel 1 ee rt BNC input connector Channel 1
95. ler ON Auto Bufor ON Slope 102 9 Auto Rend OFF Suet Auto Read OFF Offset 32A mW pH calibration screen with Manual Once meter is calibrated pH Measure screen Buffer Recognition shows the buffers that have been standardized and and last standardization time date 89 pH Operation Temperature STANDARDIZATION accumet _ To Standardize Temperature of the Meter 1 Touch Standardize on the pH measure screen to access the standardized screen 2 Immerse your ATC probe into a solution of known temperature such as a tempera ture bath for a few minutes while temperature stabilizes 3 Make sure ATC probe is attached to meter a 4 5 Temp Sid Touch Temp Std to access temperature standardization The Temperature Standardization screen appears Check the current temperature displayed with that of the solution of known temperature Touch the Standardization Temperature box and use numeric keypad to enter the current temperature Press Enter to confirm value Touch OK to confirm Standardization Temperature and return to the pH Measure screen Touch Reset to reset and enter a new standardization temperature Touch Cancel to cancel temperature standardization and return to the pH Standardization screen Note The meter will not allow entered value to exceed 5 of the ATC probe value If entered value exceeds 5 an error window will appear and you will have to re enter value or cancel o
96. llows you to continuously monitor the mV potential of the electrodes in use This can be done in either absolute or relative mV In the millivolts mode the current millivolt output from the electrodes being used is moni tored and displayed on the screen The meter will continually monitor the millivolts read ing in this mode and will not lock onto a single reading However once the reading has become stable a STABLE will be displayed Remember to setup your mV measuring mode parameter see pages 35 43 for the mV Setup section mn Masar eena 4 Rel W Measar ipeni Channel 1 45 STABLE a ds gt Touch me mV loon for plain me peng Touch at mv icon Goo ate my org ce iati Absolute mV measurement screen Relative mV measurement screen 93 mV Operation mV MEASUREMENT accumet 7 In the mV mode you will be able to make measurements in either absolute or relative millivolts access the mV Setup screens and print your results to a printer or a computer Connect the electrodes you will be using to the meter See pages 8 9 for details Absolute mV Measurements 1 Access the mV measure screen from the main screen 2 Immerse the rinsed electrode s in the sample and stir gently 3 Record the measurement when STABLE is displayed Relative mV Standardization and Measurement In the relative mV mode we have an option either to adjust the displayed value within a 150 mV window or equate it to zero 1 Access the mV Measu
97. look at specific data points stored in the meter based on the meters memory capacity The stored data can be sorted by any of the parameters available in the screen header The meter stores salinity data under the following parameters Reading Operator Date Time Channel Sample Id Temperature Last Standardizations Meter Model Serial No Viewing Stored Salinity Data is done the same way as previously described in Conductivity Setup See pages 67 68 for instructions accumet LS hell Om About pH MEASUREMENT pH Operation In pH Measurement mode you will able to measure the pH of a wide variety of samples Before measuring pH you will need to standardize the meter using buffers with known pH values It is good practice to standardize the meter frequently using a minimum of two buffers Using two buffers allows the meter to calculate and display an actual slope for the electrode and therefore produce more accurate measurements If there is no standardization in the memory of the meter or if only one buffer has been used to stan dardize the meter the slope value will appear as You can standardize your meter using automatic or manual buffer recognition With the Automatic buffer recognition activated ON the meter will automatically recognize the buffers from the chosen buffer group and flash the current buffer When the reading is stable you must confirm the buffer In the Manual buffer recognition mode yo
98. n 4 Touch Clear if necessary to delete all previous standardization values If the screen says Not standardized proceed to step 5 If there is no previous ie A 5 The screen will flash a beaker icon of the buffer solution you have selected standardization there is When the reading is stable STABLE appears on the screen no need to click the Clear 6 Touch Confirm to standardize the buffer The meter will then return to the pH button If your meter measure screen already has a calibration 7 Touch Standardize on the pH measure screen to access the standardization in the memory use the screen Repeat process to standardize with up to 5 buffers Clear button if you need to clear the previous cali The efficiency of the electrode is reported as the slope When doing a multi point bration values standardization the slopes of the individual segment are calculated by the meter The slope that appears on the screen is the slope applicable to that zone in which the measurement is currently being made For optimal results the meter should be standardized at a minimum of every 8 hours For more accurate measurements the meter should be standardized more frequently pH Standardize Channel 1 12 000 STABLE vo bol H f Last Standardization 7 Mar 2004 100637 PM Last Standardsation 7 Mar 2004 4 06 37 PM f i Buffer Group USA i Buffer Group USA Touch Confirm to Standardize the buff
99. nductivity Setup button pHSete cone 9 poiFetiseuo E Conuctety Setup cM Setup Charney Gal Conducts Sea lero D If you were in single display mode you will access the Setup mode for the single channel displayed only Conductivity Setup See page 23 for pH setup directions See page 34 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity setup directions accumet ae excel gt Set SAMPLE ID Conductivity Setup A sample ID is required if you wish to log data or activate a timed printing Whenever this option is active each time you touch Log Data on the conductivity Measure screen the conductivity value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID To set sample ID Manual 1 Touch Manual for manual Sample ID entry 2 The current ID is displayed on the screen 3 Use the alphanumeric keypad on the screen to enter the desired Sample ID The BS key will allow you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept current Sample ID and return to the mV Setup screen To set sample ID Sequential 1 Touch Sequence for sequential S
100. ns appear in the Mode screen gora Replatinization is the process of replacing the platinum on the surfaces of E E the 2 cell conductivity probes that may flake or wear off over time The Replat platinum on the surface of the probe is used to increase the surface area of the measuring surface resulting in decreased polarization error Replatinization is a relatively quick procedure to perform taking no more than 5 minutes See Appendix page 132 for procedure The About button lets youview the software revision and serial number details The Sys Setup button allow you to turn on or off the beep status This is the audible beep that sounds each time any button is touched Sys Setup A The Multi Channel button lets you view multiple channels at the same time By default the meter will display three channels Ch1 in the upper display Display 1 Ch2 in the middle display Display 2 and Ch5 in the Multi Channel Ower display Display 3 Ss The Display Setup button lets you configure the display to read the Hi inputs from channels of your choice The XL50 meter has four input Display Setup Channels and offers a maximum of three simultaneous displays The following buttons appear in the mode screen after Ch1 2 3 or 5 is selected pH The pH mode button allows you to switch to the various pH operations of the meter available in Channels 1 and 2 mV The mV mode button allows you to switch to the various mV operations of
101. o enter the sample volume Touch Enter to accept the value Use the keypad to enter the standard volume o ON O Touch Enter to accept the value 10 Use the keypad to enter the volume of ionic strength adjuster used If no ISA was used enter a value of zero 11 Touch Enter to accept the value 12 Use the keypad to enter the concentration of the standard solution added to the sample 13 Touch Enter to accept the value Your Known Subtraction result is now displayed 14 Touch Print to send the data to a printer or touch Log Data to log the data to memory if a sample ID has been assigned OR Touch OK to return to the Measure screen for a new measurement lon Operation accu met KNOWN SUBTRACTION METHOD excel gt font in ena j Ohare I 5 Ti Tet Meisie rey Chanel 241 7 TARLI 105 lon Operation ANALATE ADDITION METHOD accumet Measuring Concentration in Samples Using the Analate Addition Method The analate addition method is useful when your sample is at an elevated temperature and you want to negate the effect that temperature will have on the concentration calculation This method is also useful if you have only a small amount of sample available The analate addition method differs only slightly from the known addition method see page 102 The difference is the solution that you are taking your initial mV reading in is actually the standard and not the sample of interest
102. ode pHSetu come l pafen seu GS Corday Setup Cora y Timir a re kacag ao OR or CelCortent 0 00cm Dela Tani une Rpkrenmy Tanpa Tamga Ceai T Pree Cii Timah heg io aii Cate Sora Crimi THEA here io oe Dipi Criteria Touch here bo mi Function Buttons on Conductivity Setup Screen Touch OK to confirm conductivity Setup and return to the conductivity Measure screen Touch Cancel to exit and return to the conductivity Measure screen without confirming conductivity Setup Touch View to view all conductivity data points stored in memory See pages 67 68 for details When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all conductivity Setup Criteria to the factory default CMC MNACC EE Access CONDUCTIVITY SETUP accumet To access the Setup screen 1 Make sure you are in the conductivity Measure screen either dual display or single display see page 22 2 Touch the Setup button to access the conductivity Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change Conductivity parameters select the Co
103. olution being measured However for most medium range salt concentrations in water 2 per degree works well Extremely pure water exhibits a temperature coefficient of 5 2 and concentrated salt solutions about 1 5 Since temperature effects the conductivity measurement so profoundly the usual practice is to reference the conductivity to some standard temperature This is typically 25 C but the XL50 lets the operator select any value between of 15 C and 30 C in the Setup menu option set Reference Temperature The XL50 permits you to enter the temperature coefficient which best suits your sample and use an ATC probe to automatically temperature compensate back to the chosen refer ence temperature Refer to the Setup menu option set Temperature Coefficient Replacement Parts accumet excel gt Replacement Parts Description Fisher Catalog Number accuCap refillable electrode double junction glass DOY essesssesressiesresrerreernsrrnsrnsrrnrnnnnnnrnnennnna 13 620 130 Replacement filling solution for 13 620 130 electrode eeceeeeceeeeeneeeeeeeeeeeaeeeeeeaeeeeenaeeeeeeeeeeeaeeenes 13 636 430 Accumet pH combination electrode single junction Ag AgCl reference glass body BNG CONMCCIOM iisecciiscvscveses coset isataceereazessiecaseastt eva cuasdentesetscas axe csisbeesatvaceteseceuveet etaseasvaiva ceevaeenasteteatensees 13 620 285 ATG Probe cesses soectecsccdebc ie cashcnciaccze dd bsce nn ci acea ed Sedne ta
104. on Cs Cstd Vstd a E Vstd 10E S Vg Vg As with known addition with analyte addition the sample and the standard solution contain the same ion being measured With analyte subtraction the ion being measured is in the standard solution and not in the sample solution For example a fluoride standard and a fluoride ISE might be used to measure to aluminum concentration of a sample When the sample containing aluminum is added to the standard it reduces the measured fluoride content of the standard The amount of reduction is proportional to the aluminum in the sample The analyte methods offer the same advantages as do the addition methods in that they effectively deal with complex samples A distinct advantage of the analyte subtraction method is that it can be used in cases where an ISE does not exist for a given species such as aluminum in the example cited Replatinization is the process of replacing the platinum on the surfaces of the 2 cell conductivity probes that may flake or wear off over time The platinum on the sur face of the probe is used to increase the surface area of the measuring surface resulting in decreased polarization error Replatinization is a relatively quick proce dure to perform taking no more than 5 minutes Although replatinization is not a long process the replatinization solution is costly If you are not certain that repla tinization will improve the performance of your accumet conductivity
105. on and hydroxyl ion concentrations Kw H0 OH 1x10 7 1x107 1x104 Since the hydronium ion concentration is 1 x 107 Moles liter the pH of pure water is 7 the neutral pH as stated above pH log 1 x 10 7 In aqueous solutions at 25 C the product H30 OH7 or the Kw of water must remain constant Therefore an increase in concentration of either term H3O or OH will result in a decrease in the other For example if a strong base sodium hydroxide NaOH is added to water to the extent that its final concentration is 0 01 Moles liter the concen tration of the OH ion is 0 01 Moles liter and the concentration of the H30 must decrease according to the Kw equation as follows H3O Kw OH 1 x 1014 1 x 10 1 x 10 72 The pH of this solution is pH log 1 x 10 17 12 This high pH indicates that the 0 01 M NaOH solution is strongly alkaline the concentra tion of hydronium ions is extremely small Figure 1 Neutral l Soda Strong Aad to e Lamon Juke Tomato Jules Pure Water Ammons Strong Base Go Baking be 14 gt ne more basic Ss more acidic T x pH Measurement The pH value of a sample can be determined in several ways These include the use of organic dyes which change color in certain pH ranges The dyes can be added directly to the solution or impregnated onto paper which may be dipped into the solution At best these colorimetric m
106. on demand To set Print Criteria 1 Touch the Touch here to edit button next to the Print Criteria to access the Conductivity Print Criteria Setup screen Touch ON or OFF to change the status of a criteria you want to modify Repeat step 2 for all the remaining criteria except Print Interval For Print Option select between Log Data and Timed If Log Data is selected clicking on the Print button from the Measurement screen will send the logged data to the printer If Timed is selected you can print data at an interval you select This data is buffered and is sent to the printer when the page is full Touch OK button to accept the changes of the entire group of print criteria and return to the conductivity Setup screen Print Oriat Touch haere to E Conductivity Print Criteria Setup 3 g Cate j Tire Orra Sarde EC a Cement a Tanga ire T ffenence Tanon Taree Con fica Lint Stara cane Meba Pimia Sena Mc OFF CHF OFF CFF EF HEF EF Orr ia koe zi ad Frr Iben c accumet ivi ae Set DATA STORAGE CRITERIA Conductivity Setup This screen allows you to select which criteria are stored in the data logger with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of th
107. on includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Delete to delete a selected data point from the list To delete a data point first touch the data point you want to delete then touch the Delete button Touch Delete All to delete all the data point in the memory Touch Print to print all the data points in the memory See next page for Export View and Header explanation Export View onal Hoad C Jb Jb Sie 5 pH Setup View STORED DATA accumet _ Touch Export View and Header to save your data in HTML format The file can be stored in either the Nand flash SD Card or any of the other available locations as shown in the window After having selected the path touch the alphanumeric keypad to name your file j Wieter Madel ei a E 2 Jan 2000 250C 407 12 AMI Se ATC ed 2 Jan 2000 y 61 20E Jar 4 07 09 AMi ATC hegi 2 Jon 2008 f eno i dar DE i fh SOA HOD OOUREE i 4 0706 AM ATE r tylu iloje a i COO GCDOnHOB MR P oea swn i EHEH0O0H0M0MTARARTFI SSM at el ator arated CTE l dfe j l Touch the alphanumeric keypad to Export view in HTML format name your file Ga The mV Setup screen presents many options to control the operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 1
108. or Connect the combination pH electrode by plugging it into the BNC input connector twisting to lock in place If a combination electrode isn t used connect the indicating pH electrode into the BNC input connector Plug the reference electrode into the reference pin jack Also install the ATC Do not discard the probe into the ATC jack BNC shorting cap Note Be sure to connect all probes to the appropriate channel connectors for example Input 1 Ref 1 and ATC1 Option Connect the optional AccuFET elec trode by plugging it into the FET jack on the back meter panel Allow the AccuFET to warm up five minutes before use Connect ion specific electrodes in the same manner as pH electrodes If both a conventional electrode and an AccuFET electrode are connected to the meter do not put them in a solution together because you will get inaccurate measurements accumet _ pH and ION SPECIFIC ELECTRODES Gening Started ng Started g Rinse and blot dry don t wipe elec trodes between each measurement Rinse electrodes with distilled or deionized water or a portion of the next solution to be measured a Between measurements store con ventional pH electrodes in electrode storage solution pH 4 buffer or KCI solution Refill when the level of solu tion gets below the manufacturer s recommended level Store ion specific electrodes according to electrode manufacturer s recommendations Prope
109. ou to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept the first sequential Sample ID and return to the lon Setup screen To deactivate the sample ID assignment None 1 Touch None to deactivate the sample ID assignment ion Setup Channel L Saree IL The lon Method window lets you select from a variety of ion measurement methods Direct Reading with Standards The most common method of ion measurement When using this method you will use standards of known values to standardize the meter with ion standards An ionic strength adjuster ISA is added to both the standards and the sample Two to five standards are used The standards should bracket the expected value of the sample The ion specific electrode is immersed in a stirring sample and the ion concentration is read directly from the meter Direct Reading with Blank Offset Commonly used for determining ion concentration in a sample with a very low level of ions Due to background interference at low concentration levels a blank is used and the value of the ion concentration in the blank is subtracted from the value of the measured sample Known Addition Method An incremental method used for samples with a complex matrix A standard with a known concentration of the ion species of interest is added to the sample The difference in mV potential is then used to calculate ion concentration Known Subtraction Method An incremental m
110. ouch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 1 for all the remaining criteria except Data storage Interval 4 For Data storage Interval touch MANUAL to log pH data only when the Log Data button is pushed touch STABLE to automatically log pH data when the pH reading is stable or touch TIMED to set a specific timed interval in sec onds to log pH data 5 Touch the OK button to accept the changes of the entire group of data storage criteria and return to the pH pH FET Setup screen Dis Shona G riamn pli Data Storage Setup Date Tene Gorra Taro ate OH Liit Siandardiraio C ure Baltes ce Tie Past kiia Mectel Soria he EEA LIPLIEOTLINE Papi ST TEELE dhiri Phiri APAFA STABLE THEMED 31 This screen allows you to choose what information you would like to be displayed on the pH Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is dis played on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option To set Display Criteria 1 Touch the Touch here to edit button next to the Display Criteria to access the pH Display Criteria Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining criteria except Display Re
111. ouch Standardize and repeat steps 3 7 with up to 5 standards A minimum of two standards is required to standardize the meter in this mode Updating the standardization is not possible Once five point standardization is complete if you press the Standardize icon the meter will prompt the message to clear the previous standardization If the meter has not been standardized with at least two standards a series of dashes will appear in place of a measurement value lon Operation DIRECT READING METHODS accumet 98 Measuring lon Concentration in the Direct Reading with Standards mode With Auto Read on 1 Add lonic strength adjuster to the sample 2 Immerse the ion selective electrode in the stirring sample 3 Touch Measure to begin measuring your sample The meter will accept the reading and display STABLE when the measurement meets the selected stability criteria The measure screen will fix onto this measurement and will not deviate until meas is touched Repeat steps 1 3 with additional samples With Auto Read off 1 Add lonic strength adjuster to the sample 2 Immerse the ion selective electrode into the stirring sample The meter will continually monitor the ion concentration value When the meter recognizes the reading as stable STABLE is displayed on the measure screen With the Auto Read function deactivated the display on the measure screen will indicate any deviation in the concentration 3 Repeat steps
112. ox will automatically pop up when you turn on the meter You must either log in with the correct password or log in as a Default user The Default user does not require a password User Login 1 When the meter is turned on the User Login box will appear on the Home screen 2 Select a User ID 3 Touch the Password box use the alphanumeric keypad on the screen to key in the password The BS key will allow you to backspace to remove a character that was incorrectly entered Press the Enter key NOTE If you selected Default as a User ID you do not need to enter a password 4 Touch Login the meter enters the measurement mode Fisher Scientific accumet excel gt Factory DEFAULT SETTINGS Appendix The following is the list of factory default settings for the XL50 meter You can reset your meter to the factory default settings by accessing the Reset to Factory Defaults from the System Setup screen Screen Default Setting For ALL Setup Modes Display configuration Print configuration Data configuration Sample ID Calibration Points Print interval Stable Indicator Cell Constant Temperature Units Default Temperature Reference Temperature Temperature Coefficient Alarm Limits All parameters ON All parameters ON All parameters ON None Single Point manual ON 1 000 cm Celsius 25 degree Celsius 25 degree Celsius 2 100 per degree Celsius OFF pH Setup Mode Display configuration Print confi
113. p screen Touch ON or OFF to change the status of a criteria you want to modify Touch ON or OFF to change the status of a criteria you want to modify Repeat step 2 for all the remaining criteria except Data storage Interval kf O ND ND For Data storage Interval touch MANUAL to log mV data only when the Log Data button is pushed touch STABLE to automatically log mV data when mV reading is stable or touch TIMED to set a specific timed interval in sec onds to log mV data 5 Touch OK button to accept the changes of the entire group of data storage criteria and return to the mV Setup screen Dhaka Storage C ritaria mV Data Storage Setup Caste f Tires f aria Emoe Li Tep ua beter j Minda Seria Ho DE HO eB a This screen allows you to choose what information you would like to be displayed on the mV Measure screen particularly the information contained in the data box at the bottom of the Measurement screen The status of the current display criteria is dis played on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option To set Display Criteria 1 Touch the Touch here to edit button next to the Display Criteria to access the mV Display Criteria Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining criteria except Display Resolution 4 For Di
114. p the View tab gt Address Bar to turn it on You may also double tap the Internet Explorer icon on the Home screen to launch Internet Explorer 2 Enter the Internet address URL in the Address bar using the on screen keyboard 3 Tap the Go icon Using a Favorites List With Pocket Internet Explorer and a connection to the Internet you can view Web sites on your XL50 meter by selecting one from your Favorites list To select a Web site from your Favorites list 1 From the Start menu tap Internet Explorer 2 Tap the Favorites icon and the Web site you want to view Using the Meter BUTTON FUNCTIONS accumet The touch screen of your XL50 bench meter has buttons along the right side of the screen that are common to many of the screens The following indicates the function of these common buttons D Channel 1 ay Channel 2 We Channel 3 D Channel 5 a TE Mode Setup Log Data e Profile The Channel 1 Channel 2 Channel 3 and Channel 5 buttons access the single display screen corresponding to each channel If you wish to perform standardization or printing from any of the channels you need to use single channel mode The Graph can only be viewed in the single channel mode The Mode button allows you to switch between the various operations of the meter pH mV ion pH FET conductivity resistivity TDS and salinity It also lets you configure the display options select inp
115. probe 13 620 19 manual and literature If any of these items are missing please contact the accumet Technical Support Hotline at 1 888 358 4706 Accessory Conductivity Probes and lon Selective Electrodes are available and can be ordered by calling Fisher Customer Service at 800 766 7000 Accessory pH ISE and Conductivity probes are available and can be ordered by calling Fisher Customer Service at 800 766 7000 Display 640x480 digit LCD screen size 4 1 2 x 6 menu options extensive help screens extensive configurable display yes keypad controls context specific touchscreen Memory 1000 data pts internal diagnostics yes programmable data storage store on stable time manual programmable data output timed or logged data print interval 3 to 86400 sec programmable alarm yes pH Mode range 2 000 to 20 000 resolution 0 1 0 01 0 001 relative accuracy 0 1 0 01 0 002 1 Lsd automatic buffer recognition yes manual buffer recognition yes calibration points 5 auto lock yes FET yes range 2000 0 resolution 0 1 accuracy 0 2 eames range 1x10 to 9 99x101 resolution 2 3 or 4 digits relative accuracy 0 17N calibration points 5 incremental methods KA KS AA AS continued on next page accumet Conductivity Mode Mode cell constants range conductivity resistivity Total Dissolved Solids TDS salinity accuracy Temperature Mode range resolution accuracy General inputs outputs electrica
116. probe please call the technical support hotline at 1 888 358 4706 To Perform Replatinization 1 Access the Replatinization mode from the Mode screen In any measuring mode touch Mode to access the Mode screen 2 Touch Replat to enter the Replatinization mode 3 Immerse your 2 cell conductivity probe into the replatinization solution The immersion depth should be enough to cover the vent holes on the probe 4 Touch Start on the display screen to begin the process of replatinization At this time a countdown timer will appear on the display screen showing the time elapse and time remaining in the replatinization procedure Note At anytime after you have initiated the replatinization You can touch Stop to stop the procedure OR You can touch Exit to cancel the replatinization the procedure and return to the Mode screen 4 cell conductivity probes do not require replatinization Click Start button to Initiate Replatinization is in progress replatinization process Time Hapse 0 2 Time remaining 4 58 Conductance is a quantity associated with the ability of primarily aqueous solutions to carry an electrical current between two metallic electrodes when a voltage E is connect ed to them Though water itself is a rather poor conductor of electricity the presence of ions in the water increases its conductance considerably the current being carried by the migration of the dissolved ions This is a clear distin
117. r a pH FET electrode Channel 5 can be set for a 2 cell conductivity cell or a 4 cell conductivity cell with a DIN connector The XL50 features a triple dual or single display mode In triple display mode the display is split into thirds to show three channels of your choice simultaneously In dual display mode the display is split into two halves to show two channels of your choice simultane ously The parameters displayed are based on the Display Setup see page 22 for direc tions Assigning the channels 1 Touch the Mode button on the Measure screen 2 Touch a Channel button Ch1 Ch2 Ch3 or Ch5 to select the parameter assigned to that channel 3 Touch the appropriate parameter icon to the right of the channel to assign an input to each desired channel 4 To deselect a channel simply touch the the Channel button again If multiple channels are assigned touch the Display Setup button to select and assign displayed windows see page 22 for directions To return to measurement mode touch Multi Channel if two three or four channels are assigned or touch Single Channel if one channel is assigned SSE QO a w oj Bou h a o a eet fer a Irah p a Cag Br ey inert Such Mie ial Ob ne Ob eee ee rimh Delay doseage to ok are mahy diapla Display Setup lets you select which channel will appear in each display You can allocate up to three of the four parameters to up to three d
118. r electrode care is fundamental to obtaining reliable pH measure ments Improper care of the electrode may cause the meter reading to drift respond slowly or produce erroneous readings For this reason the electrode should always be conditioned and used in accordance with manufacturer s instructions Getting Started CONDUCTIVITY CELLS accumet This meter allows you to use two types of conductivity cells the 2 cell conductivity cell and the 4 cell conductivity cell with DIN connector Only one type of conductivity cell can be connected at a time ha Carefully remove the protective cover from the end of the conductivity cell Before using your conductivity cell soak it for 5 to 10 minutes in distilled or deionized water Connect the 2 cell or 4 cell conductivity cell to the conductivity cell jack The 2 cell and 4 cell accumet conductivity cells have built in ATC probes Therefore there is no need to connect a separate ATC probe EI Rinse and blot dry don t wipe probe between each measurement Rinse probe with distilled or deionized water or a portion of the next solution to be measured Between measurements conductivity probes can be stored dry accumet i a E TOUCH SCREEN OPERATION Using the Meter When the meter is turned on it first goes though self test displays the FISHER Catalog cover briefly displays the desktop screen Home before loading the XL50 program which results in the
119. r pH setup directions See page 35 for mV setup directions See page 44 for ion concentration setup directions See page 57 for conductivity setup directions ton setup SAMPLE ID accumet A sample ID is required if you wish to log data or do a timed printing Whenever this option is active each time you touch Log Data on the lon Measure screen the lon value along with date time channel and the sample ID will be sent to data storage You can manually enter an alphanumeric identification number of 10 characters for any sample or you can have the meter sequentially number your samples beginning at the number of your choice You can also choose to deactivate the sample ID To set sample ID Manual 1 Touch Manual for manual Sample ID entry 2 The current ID is displayed on the screen 3 Use the alphanumeric keypad on the screen to enter the desired Sample ID The BS key will allow you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept current Sample ID and return to the lon Setup screen To set sample ID Sequential 1 Touch Sequence for sequential Sample ID entry 2 The current ID is displayed on the screen 3 Use the numeric keypad on the screen to enter the desired Sample ID number that you would like your sequential Sample ID assignment to begin with Every time you touch Print or Log Data on the lon Measure screen the Sample ID will increase by 1 The BS key will allow y
120. r will continually monitor the conductivity resistivity TDS or salinity reading in this mode and will not lock onto a single reading However once the reading has become stable STABLE will be displayed unless the Stable indicator has been turned OFF in the Setup mode Remember to setup your measuring mode parameters Refer to the setup section for the particular mode you will be measuring Conduct in we Cinania bs 0 932 STABLE gt Touch shandandined inen bo acen shandadination modo ampa D BL Tap JOC teoult ea 1D Dula kH Tan 20 C Stl Basco AUTO Penang Pon Call E 600 fom Colca ob SAC Co Tye 7 4 coe Seep al ibd Pcie Conductivity measure screen without standardization ivi i accumet Conductivity Operation STANDARDIZING LA Sl PE To Standardize the meter with Auto Standard Recognition Conductivity mode only 1 Touch Standardize on the conductivity measure screen to access the standard E ize screen z niire 2 If the screen says Not standardized proceed to step 4 3 Touch Clear if you need to delete the the previous standardization values 4 Immerse your rinsed conductivity cell in a standard solution 84 uS 1 413 ms 12 88 mS or 111 8 mS and stir gently The immersion depth should be enough to cover the vent holes on the electrode 5 The screen will flash a beaker icon of the standard solution you have selected When the reading is stable STABLE appears on the screen Touch Conf
121. ration To standardize the meter with Manual Standard Recognition available in all modes 1 Touch Standardize on the conductivity measure screen to access the standardized screen iF 2 If the screen says Not standardized proceed to step 4 Stunstanfire S Touch Clear if you need to delete the the previous standardization values 4 Immerse your rinsed conductivity cell in a standard solution and stir gently The immersion depth should be enough to cover the vent holes on the electrode 5 The screen will flash each beaker icon once then a number keypad will appear Using the displayed keypad input the value of the standard that you are using to standardize the meter and then touch Enter The meter now shows the standard It is important to value in the flashing beaker condition your 6 When the reading is stable STABLE appears on the screen Touch Confirm to conductivity probe standardize the buffer The meter will then return to the conductivity measure according to the screen manufacturer s 7 If you selected Single Point in the Setup mode Calibration Point s your meter is instructions prior to use now ready to measure conductivity with one standardization factor OR If you selected Multi Point in the Setup mode Calibration Point s touch Standardize on the conductivity measure screen to access the standardization screen and repeat steps 4 through 7 to standardize with up to 4 points Performing a multi point calibrat
122. re screen from the main screen 2 Immerse the rinsed electrode s in the mV ORP standard solution and wait for STABLE to appear Touch si E rik PrP or 3 Touch rel mV to access the Relative mV screen AA NAA RNE A When rel mV is touched a dialog box appears Tiri 4 Touch SET to set relative mV using numeric keypad and press Enter to confirm value OR Touch DEFAULT to accept the default value 0 mV OR Touch CANCEL to cancel and return to previous screen 5 The meter is now ready to take relative mV measurements Rinse the electrode with water and shake dry Do not wipe the electrode Wiping the electrode can cause a static charge on the glass bulb that will result in inaccurate readings accumet i ae GRAPHING FUNCTION mV Operation You can view your data as a real time graph on screen to display mV changes over time Time is plotted in seconds The graph refreshes every hour from the start of graphing 1 To view your data in graph format touch Show Graph 2 To start plotting data touch Start Plotting To stop plotting data touch Stop Plotting Once the plotting is stopped the displayed graph can be dragged left right and up down 3 To view your data more closely touch Zoom In To view more data at one time touch Zoom Out 4 To hide the graph touch Hide Graph Gs lon Operation The accumet XL50 meter offes you unparalleled versatility with respect to ion analysis You c
123. riteria except Print Option 4 For Print Option select between Log Data and Timed If Log Data is selected clicking on the Print button from the Measurement screen will send the logged data to the printer If Timed is selected you can print data at an interval you select This data is buffered and is sent to the printer when the page is full 5 Touch OK button to accept the changes of the entire group of print criteria and return to the lon Setup screen Erri Crore lon Print Criteria Sehup Dabs j Tira f Charred Arni E Tapira Bon Myth Eeto Tyce Lent Stance derbai inent iris E sm mA io ere ener f Mock Serial hace Con accumet DATA STORAGE CRITERIA excel gt This screen allows you to select which criteria are stored in the data logger with the measurement when you store the data The status of the current data storage criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be stored on demand To set Data Storage Criteria 1 Touch the Touch here to edit button next to the Data Storage Criteria to access the pH Data Storage Setup screen 2 Touch ON or OFF to change the status of a criteria you want to modify 3 Repeat step 2 for all the remaining criteria except Data storage Interval 4 For Data storage Interval touch MANUAL to store lon data only when the
124. s you can create a different User Profile for each electrode to save individual parameters and calibration information i e Ammonia Samples or Sodium Batch Testing See pages 95 97 for directions on how to set up a user profile Select Measurement Units This screen lets you select the units in which the meter will report the concentration of the ion of interest The current units are displayed on the screen To select measurement units 1 Touch the Measurement Unit box to view the list of measurement units 2 Use the scroll bar to select the desired units Once the unit has been calibrated with a particular unit of measurement if an attempt is made to change the units the unit comes out with a warning message Changing the measurement unit will erase previous standardization Do you wish to continue Pikari Le accumet AUTO READ MODE ION STABILITY CRITERIA ton setup excel gt Select Auto Read Mode You can use this meter when the Auto Read function is active or when it is inactive When the Auto Read function is active the meter will lock onto a reading when the meter recognizes it as stable The meter will not deviate from this reading until Measure is touched If the Auto Read function is inactive then the meter will continuously moni tor the concentration of the ion of interest The Measure screen display will indicate any fluctuation in the ion concentration To select Auto Read
125. s to control the operating parameters of the meter The meter is factory set with regard to these options and is ready for use under most circumstances see appendix page 122 for default settings The operating parameters of the resistivity mode can be set and controlled from the resistivity setup screen The resistivity Setup section will guide you through the various options available in the resistivity setup mode EO Amity Sete pH Setup tamaa kor Setup Charmed 2 Ermak E MARRUA TEQUE MONE Cel ri Caf Targi Fle 3 Patera Targa ata a Terms Cr 2100 te TN GEF Print Oriara Data Shorage rear Touch hese to ot Disab Cien Touch hio io el Function Buttons on Resistivity Setup Screen Touch OK to confirm resistivity Setup and return to the resistivity Measure screen Touch Cancel to exit and return to the resistivity Measure screen without confirming resistivity Setup Touch View to view all resistivity data points stored in memory See page 74 for details When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all resistivity Setup Criteria to the factory default Resistivity Setup Access RESISTIVITY SETUP accumet To access the Setup screen 1 Make sure you are in the resistivity Measure screen eith
126. solution 4 For Display Resolution touch X X to display pH with one decimal place touch X XX to display pH with two decimal places or touch X XXX to display PH with three decimal places 3 Touch OK button to accept the changes of the entire group of display criteria and return to the pH pH FET Setup screen Dis plays Creer Laat Siamelecieation Bagh E uao Balor GELE Aio Prid Set Taertpercib an Shona Ciit Lam i TTT EPE paT Derks Aamar accumet excel gt View STORED DATA l Se wo The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to look at specific data points stored in the meter based on the meters memory capacity The meter stores pH or pH FET data under the following parameters Reading Last Standardizations Operator Current Buffers Date Time Channel Slope Sample Id mV Measurement Temperature Meter Model Serial No To View Stored Data 1 Touch the View button in the pH Setup screen You can only log 1000 data points at a time To clear space for new data points you have to delete the same number of old data points as you want to add new data points Function buttons on View Stored Data Screen kuadra Data Tirs j Channel Sapia to Tapara nit r Touch OK to go back to the pH Setup screen from the View Stored Data screen When you touch the Help button information about the current screen appears This informati
127. solution is most often a concentrated solution of potassium chloride Most prob lems with reference electrodes are associated with the interruption or blockage of flow of the potassium chloride fill solution through the reference junction The classic electrode pair separate pH indicating and reference half cells offer you unmatched versatility to match the needs of your sample This approach makes for the highest accuracy as well as low replacement costs since usually only one of the pair is broken or malfunctioning However the pH indicating half cell and the reference half cell can be merged into one electrode a combination electrode Combination electrodes are quite popular for they offer distinct advantages in convenience and compactness Some combination elec trodes also incorporate an ATC probe into their body also providing temperature readout and compensation with meters equipped with these features Newer combination elec trodes are available in which the glass pH membrane sensor has been replaced with a field effect transistor or FET All of Fisher Scientific s AB AR and XL meters are capable of using this type of electrode by direct connection except AB30 lon selective electrodes ISE respond to ionic activity or concentration in a liquid because of the characteristics of the electrode s sensing membrane Ideally the ISE develops an electrical potential which is proportional to the activity or concentration of the ion
128. sopotential Point box and use the numeric keypad to enter the desired mV setting for the new isopotential point 2 Touch Enter to accept this value and return to pH pH FET Setup screen hopmentinl Puirt Set Alarm Limits This option allows you to set alarm limits for the pH measuring mode If the pH value of the measurement is outside of the boundaries set by the minimum and maximum limits audible and visual warnings will let you know that your sample measurement was outside of the set limits The Alarm Limit can be set from 2 pH to 20 pH To set Alarm Limits 1 Touch ON or OFF to set the status of the alarm of pH pH FET mode 2 Touch the Low box and use keypad to enter the new limit values 3 Touch Enter on the keypad to accept this limit and return to the pH pH FET Setup screen 4 Touch the High box and use keypad to enter the new limit values 5 Touch Enter on the keypad to accept this limit and return to the pH pH FET Setup screen DN La Alan Lins High This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed on demand To set Print Criteria 1 Touch the Touch here to edit button next to the Print Criteria to ac
129. splay Resolution touch X to set display with 1 mV resolution or touch X X to set display with 0 1 mV resolution 3 Touch OK button to accept the changes of the entire group of display criteria and return to the mV Setup screen Cis pia Criteria mae HL Term perciiwe tenait Eiaa Digby Ficka The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to look at specific data points stored in the meter based on the meters memory capacity The meter stores mV data under the following parameters Reading Operator Date Time Channel Sample Id Meter Model Serial No To View Stored Data 1 Touch the View button in the mV Setup screen You can only log 1000 data points at a time To clear space for new data points you have to delete the same number of old data points as you want to add new data points inado Day Tina f Chara Sarpi tl Tp e Function buttons on View Stored Data Screen Touch OK to go back to the pH Setup screen from the View Stored Data screen When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Delete to delete a selected data point from the list To delete a data point first touch the data point you want to delete then touch the Delete button Touch D
130. ssword 5 Touch the Company Name box use the alphanumeric keypad on the screen to key in the Company Name Press Enter key to confirm Company name 6 Touch Add a dialog box will ask Are you sure you want to add this user Touch Yes or No If you touch Yes the new user will be added If you touch No you may still edit the current user accumet excel gt accumet f ae Setting USER PROFILES Appendix Sim eer LD ped Lo Sooty tS cuiri uae D poly to all anes ordre Gawd Compare Eon Hae Fi Function Buttons on User Profiles Screen Touch Add Modify to add or modify the current details Touch Delete to delete the user applicable only to the Administrator When you touch the Help button information about the current screen appears This infor mation includes step by step instructions for operating the meter from the current screen Touch Clear to clear all user details Touch Exit to User Profiles screen Touch Apply to current user to apply Default Setting or Delete User Data function buttons to current user only Touch Apply to all user to apply Default Setting or Delete User Data function buttons to all users Touch Default Setting to reset current or all users to factory default setting of meter Touch Delete User Data to delete all measurement data for current or all users 119 Appendix 120 Setting USER PROFILES accumet _ Once you add a User Profile the User Login dialog b
131. stence itself is dependent upon pH Most organisms can exist only within a narrow pH range In humans for example the pH of blood must be maintained within the pH range of 7 3 to 7 4 In general pH is a measure of the degree of acidity or alkalinity of a substance It is related to the effective acid concentration activity of a solution by this defining equation pH log aH30 with a H3O representing the activity or effective concentration of the hydronium ion in solution Analysts traditionally work with concentration units rather than activity Therefore neglecting activity pH can be defined by the following equation pH log H30 with H30 representing the concentration in Moles liter of the hydronium ion in solution The pH range includes values from 0 to 14 Values from 0 to 7 represent the acidic half of the scale Values from 7 to 14 represent the alkaline or basic half of the scale The pH value 7 is considered neutral as it is neither acidic or alkaline The pH scale is based on the dissociation constant of water Water even in its purest state dissociates as follows producing a positively charged hydronium ion H3O0 and a negatively charged hydroxyl ion OH 2H O H 0 OH At 25 C in pure water the concentration of hydronium ions is extremely small 1 x 107 Moles liter and balanced by an equal concentration of hydroxyl ions The equilibrium constant Kw of water is the product of the hydronium i
132. t DONE 10 00E Prk Ghio Touch here bo ect Cute iho Ciena Touch ene bo a Dir Cheri Toh here to ect ca ES 6 3 Function Buttons on lon Setup Screen Touch OK to confirm lon Setup and return to the lon Measure screen Touch Cancel to exit and return to the lon Measure screen without confirming lon Setup Touch View to view all lon data points stored in memory See pages 55 56 for details When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Reset to reset all lon Setup Criteria to the factory default To access the Setup screen 1 Make sure you are in the lon Measure screen either dual display or single display see page 22 2 Touch the Setup button to access the lon Setup screen If you were in triple or dual display mode you have access to the Setup mode for each channel displayed Touch the Setup Channel buttons at the top of the screen to toggle back and forth between the setup screens for each channel To change ion parameters select the ion Setup button Gal ion Satu hiri paeau haraa Conductety Setup Savoie ID hon Sep ama Lp rey Stu Chae 2 Sampi IL If you were in single display mode you will access the Setup mode for the single channel displayed only ion Setup Channel L Sarl ID See page 23 fo
133. t and push the connection edge of the card firmly into the expansion slot If your expansion card is not recognized follow the card manufacturer s instructions to install it Removing a Secure Digital SD Expansion Card 1 Close all applications that are using the expansion card 2 Remove a card from the Secure Digital expansion slot by slightly pushing down on the card to unlock it 3 When the card disengages and pops up pull it from the expansion slot CAUTION SD cards must first be unlocked before removal Viewing the Content of Memory Cards Use File Explorer to view the files that are located on your optional Secure Digital card 1 From the Start menu tap Programs gt File Explorer 2 Tap the root directory of My Device and select the Storage Card folder SDIO to see a list of files and folders accumet excel gt Connecting to the INTERNET Using the Meter Entering an Internet Address With Pocket Internet Explorer and a connection to the Internet you can view Web sites on your XL50 meter by typing an address or Universal Resource Locator URL in the Address bar Web sites that use HTML 4 0 DHTML animated GIF images and Java applets may not work correctly in Pocket Internet Explorer without additional software To enter an Internet address URL on your XL50 meter 1 From the Start menu tap Programs gt Internet Explorer gt Address Bar If the Address Bar is not visible ta
134. t the measurement is stable The meter will automati cally change ranges from uS cm to mS cm as required NOTES You can access other functions of the meter with the remaining buttons on the measure screen e Touching Print will send the data to the meter s memory if the sample ID is activated and to a printer or a computer if it is attached to the meter The saved data can be accessed through the View Storage Data screen in the conductivity Setup mode e Touching Setup will access the conductivity Setup screen e At anytime you can touch Mode to access another mode of operation including resistivity TDS salinity or the setup mode gt Touch shandandirad mer samplu 1 ier 1 oai Std boram AUTO Call E 1a fiom tO tye i co Std Factor DEMA to rt rbaa mk Temp moi ak hai Tr 00 E Mii Punts ngn Point Comifickarnr te 10m e Rane Z Conductivity Measure screen with STABLE indicator ON 115 ivi i accumet Conductivity Operation GRAPHING FUNCTION 1 i T 116 You can view your data as a real time graph on screen to display conductivity changes over time Time is plotted in seconds The graph refreshes every hour from the start of graphing 1 To view your data in graph format touch Show Graph 2 To start plotting data touch Start Plotting To stop plotting data touch Stop Plotting Once the plotting is stopped the displayed graph can be dragged left right and up down 3 To vie
135. t to that of a potassium chloride solu tion of a known concentration This solution 0 44 molal is defined as having a salinity of 35 ppt Note ppm parts per million ppt parts per thousand 1000 ppm 1 ppt The total dissolved solids scale approximates the ppm TDS in surface waters by multi plying the conductivity of a sample by a factor 0 66 Some users prefer the use of resistivity units to describe their water particularly where high purity water is involved The unit most often used to describe resistivity is megohmecm which ar simple the reciprocal of conductivity uS cm The chart below shows the relationship between these units Conductivity uS cm Resistivity megohm cm 0 056 18 0 0 1 10 0 1 0 1 0 2 5 0 4 10 0 0 1 Conductivity Measurement Accumet conductivity electrodes consist of glass or epoxy bodies in which platinum or platinized sensing elements are fixed Typically each electrode has two such sensing ele ments and are designated two cell electrodes The previous discussion has focused on this type of electrode Four cell electrodes are also available and the theory and applica tion of these are in a separate section These sensors contact the solution whose conductivity value is sought The exact cell constant of the electrode must be determined prior to measuring the sample In essence this is accomplished by fixing the nominal cell constant of the electrode into the meter and recording the obser
136. ta Screen Touch OK to go back to the pH Setup screen from the View Stored Data screen When you touch the Help button information about the current screen appears This information includes step by step instruc tions for operating the meter from the current screen and pos sible applications information for that screen Touch Delete to delete a selected data point from the list To delete a data point first touch the data point you want to delete then touch the Delete button Touch Delete All to delete all the data point in the memory Touch Print to print all the data points in the memory See next page for Export View and Header explanation Engt Vise d Hoki C Jb Jed ee Died Conductivity Setup View STORED DATA accumet _ Touch Export View and Header to save your data in HTML format The file can be stored in either the Nand flash SD Card or any of the other available locations as shown in the window After having selected the path touch the alphanumeric keypad to name your file 2 Jan 2002 BOC Lal2es aos1eaMcn 7 Deft 2 Jan 2002 50e LARES 405 15 AMC Defaut 2 Jan S002 ay 4 0 405 12 AMS Daut 2 jan 2002 y 4 0 3 38 24 AMEE Eost a seneses ona erme mees reren l LAL mS La ms Touch the alphanumeric keypad to Export view in HTML format name your file accumet eee a om RESISTIVITY SETUP SCREEN Resistivity Setup The resistivity Setup screen present many option
137. ter to accept the value 12 Use the keypad to enter the concentration of the standard solution 13 Touch enter to accept the value Your Analate Subtraction result is now displayed 14 Touch Print to send the data to a printer or touch Log Data to log the data to memory if a sample ID has been assigned OR Touch OK to return to the Measure screen for a new measurement lon Operation accumet ANALATE SUBTRACTION METHOD excel gt lon Mania e nN hannel 1 leet Pinas irn Chail 65 5 Ol ses 5 PARLE Touch AS to tai ist nadine unin AMALATE SUB TRACTOOR T 61 0 m gt Touch sbemhedire foo bo ace sberehedirelo irae Bit m ae i Sampie Volume 10 0 io IEA Yme 10 0 ides gm n i j Hex F Standand Concentration 10 0 ion Type CAT 109 i accumet lon Operation GRAPHING FUNCTION ac en You can view your data as a real time graph on screen to display ion concentration changes over time The graph refreshes every hour from the start of graphing 1 To view your data in graph format touch Show Graph 2 To start plotting data touch Start Plotting To stop plotting data touch Stop Plotting Once the plotting is stopped the displayed graph can be dragged left right and up down 3 To view your data more closely touch Zoom In To view more data at one time touch Zoom Out 4 To hide the graph touch Hide Graph 110 accumet ivi i KAA R About CONDUCTIVITY MEASUR
138. teria and return to the lon Setup screen lon Mapla Oiber La Se bup Measure arra ant Shenchandinstior Sargi D Sianclardegston Method Hash Aiid Tiia O OM On Tara Le ee Eleta Tt rol Cay H0 sR Diay Feti The XL50 has a memory capacity to store up to 1000 data points The View Stored Data screen allows you to sort and look at specific data points stored in the meter based on the meters memory capacity The stored data can be sorted by any of the parameters available in the screen header The meter stores lon data under the following parameters Reading Date Time Channel Sample Id Temperature mV measurement To View Stored Data 1 Touch the View button in the mV Setup screen 3 k J te B Po 3 You can only log 1000 data points at a time To clear space for new data points you have to delete the same number of old data points as you want to add new data points Function buttons on View Stored Data Screen l arg Caa Trj ha Sa Tapaa W Touch OK to go back to the lon Setup screen from the i ais View Stored Data screen When you touch the Help button information about the current screen appears This information includes step by step instructions for operating the meter from the current screen and possible applications information for that screen Touch Delete to delete a selected data point from the list To delete a data point first touch the data point you want to delete t
139. u must enter the buffer value during the stan dardization procedure The meter will flash the manually entered buffer you must confirm the buffer when the reading is stable During the standardization procedure you may accept the buffer value before the meter recognizes it as stable by touching confirm See the Setup section on page 27 to select desired buffer recognition Remember to setup your pH measuring mode parameters Refer to pages 23 34 for pH Setup section instructions Connect the electrodes you will be using to the meter Touch the Channel 1 2 or 3 buttons single pH channel screen to access the standardization screen Standardization is not available from the dual display mode pH Measure Not atuncarceed gt Touch standardize toon to access stincardictan mode Sample ID Tomp Z5 5 C ATC User ID Dofomlt Auto Butter gt ON Auto Rend OFF pH measure screen without standardization 87 pH Operation STANDARDIZING accumet _ To Standardize the meter with Auto Buffer Recognition 1 Make sure Auto Buffer Recognition is selected in the Setup screen id 2 Immerse your rinsed electrode s and temperature probe in a buffer solution from the selected buffer group that you chose during the pH setup process and stir femine gently The selected buffer group appears on the standardization screen 3 Touch Standardize on the Channel 1 2 or 3 pH measure screen to access the standardization scree
140. u through the measurement process with a series of prompts on the screen The accumet XL50 provides microprocessor precision in a compact benchtop design that is easy to use One touch screen controls all procedures letting you e Measure pH or pH FET absolute mV or relative mV ion concentration and con ductivity resistivity Total Dissolved Solids TDS or salinity e Select one of three sets of standard pH buffer groups e Standardize with up to five pH standard or custom buffers and with up to four conductivity standards e Implement automatic pH buffer recognition or automatic conductivity standard recognition e Select one of six ion standardization methods e Customize your display screen and operating parameters e Assign operator and sample identification numbers e Specify ion selective electrode type e Store 1000 data points per user in the meter s memory or transfer data to a com puter or printer e Access extensive help with just a touch a button It all adds up to rapid completely automatic intuitive operation Unpacking the Meter The following is a listing of what you should have received with your new accumet XL50 pH mV lon Conductivity meter Meter with kit includes Meter only includes meter meter power supply power supply electrode arm support bracket electrode arm support bracket electrode arm electrode arm pH electrode 13 620 130 manual and literature Two cell conductivity probe 13 620 100 ATC
141. ur meter was shipped with a clear protective sheet to protect the LCD display and bub bles may appear on the screen The screen will respond better and visibility will improve if it is removed Alternatively you may choose to leave this on for added protection NOTE To turn off the display without removing the power cord simply press the black button on the back right of the meter Press again to turn display on Screen contrast adjustment You can adjust the contrast of your screen to your requirements 1 From the HOME screen tap the bottom left of the screen to access the Start menu Tap Start gt Settings gt Control Panel This launches the Control Panel screen 2 Tap the Display Contrast icon twice 3 Use the up and down arrows to select your desired contrast 4 Tap the Apply key to view your adjusted contrast Tap the Close key to shut the window m er LA accumet Using the Meter excel gt Using the STYLUS Using the Meter Your XL50 Meter comes with a stylus that you should use to tap on your screen The stylus easily stores inside the back panel of the meter You can perform two basic actions using the stylus Tap Lightly touch the screen to select or open an item Lift the stylus after you tap an item Tapping is equivalent to clicking an item with the mouse on your personal computer Note Some program items require a double tap to select or launch Double tap on the icons
142. using AC voltage the appropriate cell constant and a large electrode surface area The influence of polarization can also be minimized by the use of a four cell elec trode The four cell configuration consists of two cells and outer cell and an inner cell Voltage is applied to the sensors of the outer cell which in turn generates a voltage across the sen sors of the inner cell The inner cell is connected to a high impedance circuit and unlike the outer cell generates no current Since no current is generated across the inner cell polarization cannot occur at the inner cell By measuring the voltage of the inner cell which is adjusted to match the reference voltage by increasing or decreasing the current through the inner cell one obtains a true picture of conductivity minus the influence of polarization Optimum Conductivity Range Cell Constant 4 cell 0 1 Not Available 1 0 0 01 to 20 mS cm 10 0 1 to 200 mS cm Conductivity and Temperature Conductivity in aqueous solutions reflects the concentration mobility and charge of the ions in solution The conductivity of a solution will increase with increasing temperature as many phenomena influencing conductivity such as solution viscosity are affected by tem perature The relationship between conductivity and temperature is predictable and usually expressed as relative change per degree centigrade This temperature coefficient change per degree depends on the composition of the s
143. ut of the temperature screen This might indicate that you have a a problem with the ATC probe Temperature Standardization Cumt Tearmpanahure E j EEJ ESY T Eos Ea Standirdiation Tergem f Ecd EH accumet 7 pH MEASUREMENTS pH Operation The measure screen provides readout of the current sample measurement You can use this meter when the Auto Read function is active or when it is inactive When the auto read function is active the meter will lock onto a reading when the meter recognizes it as stable The meter will not deviate from this reading until the Measure button is touched If the Auto Read mode is inactive then the meter will continuously monitor the pH of the sample and the Last Stanchrdsation 7 Mar 2004 4 0637 measure display screen will indicate any fluctuation in Bufier Group USA the sample pH Regardless of the status of the Auto lt lt Read mode STABLE will flash as the meter recog nizes the measurement as stable gt Touch measure conto measure sample Once the meter is standardized you are ready to take gt Touch sandardize toon tn accmesstancandietion made pH measurements of your sample 25 5 C ATC 173 2 101 3 7 1 8mV pH Measure screen with Auto Read OFF To Measure pH of a Sample with Auto Read ON 1 Immerse the rinsed electrode s in the sample and stir gently 2 Touch Measure to begin measuring your sample The meter will accept the reading and display STABLE
144. ut parameters and view the software revision and serial number details The Setup button will access the setup screens of the measuring mode that you are currently using The Log Data button sends data to the data storage center of the meter if a sample ID has been assigned to your sample The Profile button lets you view your profile User ID Password Company Name User Group You can change only your profile and not of any other user You can change to a different user only if you are the default user of the system The Home button accesses the Windows CE desktop The XL50 application does not shut down if Home is pressed and the current user remains logged in Double tap on the XL50 icon to return to the previous screen before the Home button was pressed The Logoff button allows you to logoff the current user from the XL50 appli cation The XL50 application shuts down returning to the Win CE desktop When you re start the application you go to the main screen of the applica tion The second time you are logged in as the default user of the system The Help button allows you to access helpful information on any screen Touching the Help button gives you information about the current screen This information will include step by step instructions for operating the meter from the current screen and possible applications information for that screen accumet f excel BUTTON FUNCTIONS Using the Meter The following butto
145. ved conductivity value associated with a standard conductivity solution usually a KCI solution with a precisely known value The following calculation yields the actual cell constant k standard value of solution uS observed value of solution uS Fortunately the accumet XL50 meter automatically does this calculation for you by touching Standardize To produce an appropriate current signal for the meter it is important to choose an elec trode with an appropriate cell constant The following table lists the optimum conductivity ranges for electrodes with cell constants of 0 1 1 and 10 Optimum Conductivity Range Cell Constant 2 cell 0 1 0 5 to 200 uS cm 1 0 0 01 to 2 mS cm 10 0 1 to 200 mS cm Prior to use the electrodes should be conditioned in distilled or deionized water for at least 10 minutes or in accordance with the manufacturer s instructions The four cell electrode Traditionally conductivity measurements were made with a two cell electrode This elec trode used two metallic sensors and anode and a cathode to which ions migrated Under the influence of DC current the electrodes quickly became polarized In this situation mol ecules formed at the electrode surfaces and ions migrating to the area collect around the respective anode or cathode and actually screen it from other ions In essence the flow of ions stops and current ceases to flow Polarization and associated errors can be mini mized by
146. w you to backspace to remove a character that was incorrectly entered 4 Touch Enter to accept the first sequential Sample ID and return to the mV Setup screen To deactivate the sample ID assignment None 1 Touch None to deactivate the sample ID assignment mY Saou Parr 1 Taris This option allows you to set alarm limits for the mV measuring mode If the mV value of the measurement is outside of the boundaries set by the minimum and maximum limits audible and visual warnings will let you know that your sample measurement was outside of the set limits The Alarm Limit can be set from 2000 0 mV to 2000 0 mV To set Alarm Limits 1 Touch ON or OFF to set the status of the alarm of mV mode 2 Touch the Low box and use keypad to enter the new limit values 3 Touch Enter on the keypad to accept this limit and return to the pH mV Setup screen 4 Touch the High box and use keypad to enter the new limit values 5 Touch Enter on the keypad to accept this limit and return to the mV Setup screen Alarm Erra accumet excel gt Set PRINT CRITERIA mv Sep This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed on deman
147. w your data more closely touch Zoom In To view more data at one time touch Zoom Out 4 To hide the graph touch Hide Graph accumet excel gt Meter and Electrode Warranty Statement The Fisher Scientific Company Fisher warrants to the direct purchaser that the accumet meters and Accumet AccuTupH AccuFET AccupHast and Microprobe electrodes will be free from defects in material or workmanship for a specified warranty period During that period Fisher will repair or replace the product or provide credit at its sole option upon prompt notification and compliance with its instructions For accumet meters that speci fied period is 24 months from delivery date For electrodes that specified period is 12 months except for models 13 620 532 13 620 533 13 620 534 13 620 535 13 620 536 13 620 537 13 620 538 and 13 620 539 which are warranted for six months Unless otherwise agreed the warranty is limited to the country in which the product is sold No Fisher employee agent or representative has the authority to bind Fisher to any oral representation or warranty concerning any product sold Any oral representation or warran ty made prior to purchase of any product and not set forth in writing and signed by a duly authorized officer of Fisher shall not be enforceable by the purchaser FISHER EXPRESSLY DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITN
148. way as previously described in Conductivity Setup See page 63 for instructions To Set Alarm Limits This option allows you to set alarm limits for the TDS measuring mode If the TDS value of the measurement is outside of the boundaries set by the minimum and maximum limits audible and visual warnings will let you know that your sample measurement was outside of the set limits The Alarm Limit can be set from 0 00 to 500 00 ppt depending upon TDS factor To set Alarm Limits 1 Touch ON or OFF to set the status of the alarm of TDS mode Touch the Low box and use numeric keypad to enter the new limit values Touch Enter on the keypad to accept this limit and return to the TDS Setup screen Touch PPM or PPT to select TDS units of low alarm value Touch the High box and use numeric keypad to enter the new limit values Touch Enter on the keypad to accept this limit and return to the TDS Setup screen Touch PPM or PPT to select TDS units of high alarm value 2 3 4 5 6 7 Alati Liris To Set Print Criteria This screen allows you to select which criteria are printed with the measurement when you print the data The status of the current print criteria is displayed on the screen The criteria option is active if ON appears to the right of the option It is inactive if OFF appears to the right of the option Any active criteria will be printed on demand The TDS Print Criteria is set the same way as previously descr
149. when the measurement meets the selected stability criteria OR To Measure pH of a Sample with Auto Read OFF 1 Immerse the rinsed electrode s in the sample and stir gently 2 Record the reading once the measurement has become stable STABLE will appear once the meter recognizes that the measurement is stable NOTES You can access other functions of the meter with the remaining buttons on the measure screen e Touching Setup will access the pH Setup screen e Touching Measure will initiate a new measurement of a sample with Auto Read ON e At anytime you can touch Mode to access another mode of operation 91 i accumet pH Operation GRAPHING FUNCTION LA te PE You can view your data as a real time graph on screen to display mV changes over time Time is plotted in seconds The graph refreshes every hour from the start of graphing 1 To view your data in graph format touch Show Graph 2 To start plotting data touch Start Plotting To stop plotting data touch Stop Plotting Once the plotting is stopped the displayed graph can be dragged left right and up down 3 To view your data more closely touch Zoom In To view more data at one time touch Zoom Out 4 To hide the graph touch Hide Graph accumet i pid ie About mV MEASUREMENT mV Operation This mode is used to measure oxidation reduction potential ORP redox perform titration and to verify the function of the meter The mV measure function a
150. your custom buffer set Press Enter in the keypad to accept the value a fF WO ND Repeat steps 2 through 4 until all 5 custom buffer beakers are populated with desired values 6 To modify the value entered touch the particular beaker and key in the new value using keypad 7 To clear all custom buffer values touch CLEAR Buffer Grong RA j MISI E guaTA accumet Select BUFFER RECOGNITION Select AUTO READ MODE pH sewp excel gt Select Buffer Recognition This option allows you to select Automatic buffer recognition or manual buffer recog nition when standardizing With the automatic buffer recognition activated the meter will automatically recognize the buffers from the chosen buffer group and accept them when the meter recognizes the reading as stable When in the Manual buffer recognition mode you must enter the buffer value during the standardization proce dure The meter will accept the manually entered buffer when you recognize that the measurement is stable During the standardization procedure you may accept the buffer value before the meter recognizes it as stable by touching the Standardization button To select Buffer Recognition 1 Touch MANUAL or AUTO to choose the method of buffer selection Err Roa Select Auto Read Mode You can use this meter when the Auto Read function is active or when it is inactive When the Auto Read function is active the meter will lock onto a r

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