User Manual
Contents
1. 25 0 C 0002 7 84ich 25 0 C 0003 gt No Reccrd lt 0004 gt No Record lt 0005 gt No Record lt 0006 7 01 H 22 8 1 0007 7 010 22 85 0008 7 01pH 22 870 0009 gt No Record lt 0010 gt No Record lt 0011 gt No Record lt 0012 gt No Record lt 3013 gt No Record lt J014 gt No Record lt 0015 gt No Record lt 0016 gt No Record lt 0017 gt No Record lt 1018 gt No Secore lt 0019 gt No Secorc lt 0020 gt Nu Record lt 0021 gt No Record 0022 gt No Record lt 0023 gt No Record lt 0024 gt No Record lt 0025 gt No Record lt 0026 gt No Record lt 002 gt No Record lt 0028 gt No Record lt 0022 gt No Record lt 0030 gt No Record lt 0031 gt No Record lt 0037 gt No Record lt A 351 050 REV A 03 03 Section 7 Troubleshootiing and functional checks 7 1 Troubleshooting Fault No display Erratic display Drifting erratic readings Cannot calibrate ERROR EO ERROR SLOPE Unable to recognise buffers Temperature readings fluctuating Temperature readings incorrect Will not print Possible Cause Check power supply Check power supply Electrode fault Electrode Fault Buffer problem Electrode problem Using correct buffer set Temp probe faulty Temp probe faulty Manual temp not set Connection Paper out Battery flat Action Check2. 3 TXD TXD 2 4 DTR DTR 20 5 GND GND 7 6 DSR DSR 6 ne or ls 8 CTS CTS5 9 3510 IBM PC XT 9 way D 1 DCD 1 DCD 2 RXD 2 RXD 3 TXD 3 TXD 4 DTR 4 DTR 5 GND 5 GND 6 DSR 6 DSR mero ee AS 8 CTS 8 CTS 9 9 NOTE Interface Cable Order Code 013 203 is required 23 545 007 REV A 03 96 Interfacing continued The RS232 communications parameters on the computer or printer need to be set to match those of the Model 3510 as detailed below 1200 Baud 9600 Baud 7 Data Bits 8 data bits Odd Parity OR No parity 1 Stop Bit 1 stop bit Setting of these options is detailed in Section 3 6 6 The Model 3510 supports both hardware CTS RTS flow control and software XON XOFF flow control Pressing the PRINT key outputs from the RS232 interface Sending an ASCII D to the 3510 causes a printout of the current displayed reading plus sample number Sending an ASCII C causes a printout of the last calibration parameters Sending an ASCII P causes a printout of the stored readings 6 3 Keypad Emulation Keypad remote control using RS232 interface 7 Instrument On Standby Escape 1 Calibrate Memory Clear 9 Print 8 Up Arrow 2 Down Arrow 4 Left Arrow 6 Right Arrow 3or5 Enter Store 24 351 050 REV A 03 03 6 4 Printing A 32 column serial printer 037 701 is available for use with the Model 3510 Connect the printer via the cable supplied with the printer to the 9 way socke
3. 500ml 025038 7 00 pH buffer 500ml 025159 465mV 25 500ml 025162 9 22 pH buffer 500ml 025039 10 05 pH buffer 500ml 025179 pH 4 buffer sachets pack of 10 025180 pH 7 buffer sachets pack of 10 025181 pH 10 buffer sachets pack of 10 Miscellaneous 025160 3MKCI Electrode Fill Solution 100ml 025161 Electrode Cleaning Solution 500ml 5 2 Spares 924 005 pH combination electrode glass bodied 027 500 ATC probe 009 146 BNC shorting plug 037702 Paper roll thermal 021030 UK 230V power supply 021 031 European 230V power supply 021032 US 115V power supply 021 033 230V leaded power supply 22 351 050 REV A 03 03 SECTION 6 Interfacing 6 1 Analogue All units are provided with 2 x 4mm sockets marked as ANALOG OUT on the rear panel An analogue output voltage of 1mV per least significant digit is available from these sockets Recorder output 2000mV proportional to displayed reading 1mV per 0 01pH pH measurement and calibration modes 1mV per 1mV mV measurement mode 6 2 RS232 The Bi directional RS232 interface is available on the rear panel 9 way D type connector The connections are as follows DCD 1 LINKED TO DTR AND DSR RXD 2 INPUT TO 3510 TXD 3 OUTPUT FROM 3510 DTR 4 LINKED TO DCD AND DSR GND 5 DSR 6 LINKED TO DCD AND DTR RTS 7 OUTPUT FROM 3510 CTS 8 INPUT TO 3510 Suggested interconnections are detailed below 3510 IBM PC XT 25 way D 1 DCD DCD 8 2 RXD RXD 3
4. C 1 F 0 to 100 C 32 to 212 F 0 to 100 C 32 to 212 F Jenway 2 00 4 00 7 00 9 20 and 10 00 DIN 3 06 4 65 6 79 9 23 12 75 NIST 1 68 4 01 6 87 9 18 12 45 JIS 1 68 4 01 6 87 9 18 12 45 or manually entered buffers User selectable 1 2 or 3 point Analogue 1mV per 0 01pH RS232 Back lit custom LCD Power Supply 9Vac 275 x240 w x150 d mm 850g 351 050 REV A 03 03 Section 2 Installation 2 1 Unpacking Remove the Model 3510 from the packaging and ensure the following items are included Model 3510 pH mV Temperature Meter Glass bodied combination pH electrode 924 005 ATC probe 027 500 Electrode holder 4 7 and 10pH buffer sachets BNC shorting plug 009 146 Power Supply as specified at time of ordering the product Condensed operating instructions 351 051 Operating Manual 351 050 OAONDAaARWN gt Any shortages or damage should be reported immediately to the manufacturer or your local distributor 2 2 Installation The Model 3510 is supplied ready to use Connect the ATC if required and the pH electrode to the rear panel Temp and pH sockets The electrode stand requires minimal assembly refer to the diagram below Fig 2 2 1 Electrode Holder Assembly 2 351 050 REV A 03 03 2 3 Display Fig 2 3 1 Display 10 MANO MIAO a CAL123IAUTOMANDINISTJISTRISFE sa m se T ES va a LJ MAN 8 ld O Ea MEM
5. The display will be set to zero thereby removing any offset voltage Sample measurement is then carried out by using a variety of well tried analytical methods from simple calibration curves through titrations to single and multiple addition methods Select the mV mode using the Up Down arrows which toggle between pH and mV modes The CAL CLR key switches between Absolute and Relative mV Relative mV is indicated by REL on the display i nr mim L I mv Lit at eau 250 SETUP monr RESULTS serue mone RESULTS 18 351 050 REV A 03 03 3 10 Performing Measurements To perform measurements in pH mV or temperature modes the following should be carried out 1 mV Measurement a Connect the electrode to the unit via the BNC socket on the rear panel If a separate reference electrode is to be used this should be connected to the Ref socket b Select mV mode using the Up Down arrows The display will show the electrode output directly in mV 2 Temperature Measurement using ATC a Connect the ATC probe to the unit via the Temp socket on the rear panel b Select C or F via the Set up menu The secondary display will show ATC probe temperature directly in C or F 3 Temperature Measurement Manual a If Manual temperature compensation is being used the preferred measurement range should be selected via the Set Up menu b Immerse the electrode into the solution and set the to the solution temperature via t
6. measurement of unknown solutions If the tempera ture of the unknown solution differs from the buffer the Set up menu should be used to set the instrument display to the temperature of the unknown solution If the instrument fails a calibration the error message ERROR E OUTSIDE LIMITS will scroll along the secondary display refer Section 3 8 for details of Error Codes 35 ERRO SETUP_ mone 15 351 050 REV A 03 03 3 7 2 Calibration with Automatic Temperature Compensation To exit the calibration sequence at any time press the ESC key This will cancel the pH calibration and return the instrument to the MODE menu Note Buffer solutions should be carefully prepared as per the manufacturers instructions 1 Select the pH measuring mode using the Up Down arrows which toggle between pH and mV modes Press the CAL key The primary display will show the current pH reading The main display annunciators will indicate CAL 1 and the buffer type being used The secondary display will show the ATC temperature in C or F The status display will indicate the Eo or slope values 2 CAL 1 Immerse the electrode s in the first buffer solution and allow the instrument to stabilise When no change in the least significant display digit is detected over a five second period the endpoint symbol will be displayed Press the CAL or STO key Be ee pas CAI1 Al Te le 59 EEr fluon fresucrs If a successful point calibrati
7. of the buffer solution being used The unit should then be calibrated to the corrected pH value Manufacturers of buffer powders and solutions will provide a table of values at varying temperatures for their buffers Note Buffer solutions will contaminate with exposure to air and should be stored in airtight containers when not in use Used solution should be discarded and not returned to the container as this will cause contamination For best results fresh solutions should be prepared prior to calibration 7 351 050 REV A 03 03 3 5 Good Practice Guidelines The types of electrodes are many and various For the majority of tests carried out on aqueous solutions with a reasonable ionic strength at ambient temperatures and with limited use in strongly acidic or alkaline solutions the standard glass or epoxy bodied combination electrode is ideal For other applications a more suitable pH reference electrode pair may be required details or advice supplied on request The following general guidelines indicate the care and maintenance required for the three main groups of electrodes Combination Reference and pH For more detailed advice on specific electrodes contact the electrode manufacturer 1 10 11 After use Rinse thoroughly with deionised water Short term storage Immerse in pH 4 buffer all types Long term storage Fit wetting cap filled with 3M KCI adjusted to pH 4 Electrodes should be stored a away from direct sunlig
8. press the STO key The instrument display will update and show the Baud Rate set up menu Any changes to manual temperature settings reflect on 3 6 4 To exit the set up menus press the ESC key at any time This will return the instrument to the MODE menu 12 351 050 REV A 03 03 3 6 6 Baud Rate For full details relating to serial protocol refer to Section 6 of this manual The display will show c3 EA Hb SERIA SETUP MONF RES ULTS FA The secondary display will show BAUD and will then scroll SERIAL PORT BAUD RATE after 10 seconds Select the required baud rate 9600 or 1200 using the Up Down arrow keys The data bits and parity will automatically adjust as the baud rate is selected The Left Right arrow keys and the CAL CLR key have no function during this set up A v To accept the selected baud rate press the STO key The symbol will disappear and the secondary display will momentarily show SAVED and the instrument will return to the Mode menu Symbol will flash while adjustment is being made To exit the set up menus at any time press the ESC key This will return the instrument to the MODE menu 13 351 050 REV A 03 03 3 7 pH Calibration 3 7 1 Calibration with Manual Temperature Compensation To exit the calibration sequence at any time press the ESC key This will cancel the pH calibration and return the instrument to the MODE menu Note Buffer solutions should be carefully prepared as p
9. 3510 using fresh buffer solutions see section 3 6 Temperature input check Remove the temperature probe and apply a 10Kohm resistor across the pins of the temp input as described in fig 7 2 1 Fig 7 2 1 Temperature input with connection detail Sensor inputs 7 3 Reset Procedure NOTE Performing a reset will return all options to the default values It will not delete stored data 1 Remove AC power connector from the rear panel socket 2 Press and hold the STO key 3 Replace the AC power connector into the rear panel socket The secondary display will momentarily show E2 RST 4 _ lf this does not resolve the problem please contact the manufacturer or your local distributor 28 351 050 REV A 03 03 EC Declaration of Conformity Jenway Model 3510 pH mV Temperature Meter complies with the following European Standards EN 50081 1 1992 Electromagnetic compatibility Generic emission standard EN 50082 1 1992 Electromagnetic compatibility Generic immunity standard EN 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use Following the provision of EMC Directive 89 336 EEC and Low Voltage Directive 73 23 EEC Martyn J Fall Managing Director Jenway Gransmore Green Felsted Dunmow Essex CM6 3LB England 29 545 007 REV A 03 96
10. Arrow 7 Right Arrow 8 STO Fo ca ra esc art LJ used to switch the instrument on and to place into standby mode only if power supply lead remains connected to the instrument Also used to escape exit a mode used to select and perform a calibration sequence This key is also used to clear readings from Memory Used to select Abs Rel mV in mV mode used to initiate a print used for adjustment during set up to scroll results and to toggle between mV and pH modes used for adjustment during set up to scroll results and to toggle between mV and pH modes used for adjustment during set up and to move between mode tags used for adjustment during set up and to move between mode tags used to accept an entered value in set up mode and to instigate a stored reading This key can also be used as a CAL key during calibration 4 351 050 REV A 03 03 2 5 Inputs Outputs Fig 2 5 1 Rear panel layout 200 Temp Analog DP RS 232 1 Ref Socket 2mm pin socket Connection socket for separate reference electrode When performing measurements with some pH and on selective electrodes a separate reference electrode is needed 2 pH Socket BNC type socket which allows combination pH or redox electrodes to be used 3 Temp Socket 8 pin mini DIN socket This allows the Automatic Temperature Compensation ATC probe 027 500 to be connected 4 Analog Out 2 x 4mm sockets Analogue output buffered electrode potent
11. Food electrode is used 924 051 This will reduce the risk of blockage from fat proteins will be easy to clean and is perfect for measurements in agar media This electrode is also recommended for measurement in any solution where deposits on the electrode are likely The flat surface is easy to clean and robust For low ionic strength applications the Environmental electrode 924 050 is recommended 8 351 030 REV A 03 03 3 6 Instrument Set Up The following section details the set up modes available to the user These are Number of calibration points entry Buffer type entry Manual buffer entry 1 3 Display resolution Manual temperature Temperature units and serial port Baud Rate These can be set in sequence as detailed in this section or by entering the SETUP mode and using the STO key to select a specific parameter at any time To exit the set up menus at any time press the ESC key This will return the instrument to the MODE menu Any parameters not saved will remain as defaults or previous setting 3 6 1 Number of calibration points entry I 2 or 3 point calibration is possible on the 3510 To set these parameters Select SETUP mode on the display using the Left arrow key a CALPTS SETUP MONF RESULTS The secondary display will show CALPTS and will then scroll CALIBRATION POINTS after 10 seconds Select the required number of calibration points using the Up Down arrow keys The Left Right arrow keys and the CA
12. Glass Electrodes Deposit Cleaning Agent General deposits Genklene or mild detergent solution Inorganic coatings Commercial glass cleaning solution not strongly acidic Metal compounds Acid solution not stronger than 1M Oil Grease Complexing agent EDTA or suitable solvent Resins Lignins Acetone alcohol or detergent not strongly acidic Proteins blood etc Enzyme solutions e g pepsin in 0 1M HCl Stubborn deposits Hydrogen peroxide sodium hypochlorite or domestic bleach Note Solvents such as carbon tetrachloride trichloroethylene petroleum ether etc MUST NOT be used for cleaning electrodes that have a plastic body or a plastic protective skirt 21 351 050 REV A 03 03 Section 5 Optional Accessories The following list of items are available as optional accessories for use with the Model 3510 060 406 Dust cover 037 701 Printer supplied with roll of thermal paper serial connection lead power supply power connection lead UK and pouch 037 801 Interface cable kit 050 002 Serial communication software 31 2 disk pH electrodes 924001 General purpose epoxy bodied combination 12mm diameter For liquids 924005 General purpose glass bodied combination 12mm diameter For liquids For a complete listing of all available electrodes please contact your local distributor Buffer Solutions Redox Standards 025163 2 00 pH buffer 500ml 025157 200mV 25 500ml 025037 4 00 pH buffer 500ml 025158 300mV 25
13. L CLR key have no function during this set up A Symbol F will flash while adjustment is being made To accept the number of calibration points entered press the STO key The symbol will disappear and the secondary display will momentarily show SAVED and the next set up menu option will be displayed 9 351 050 REV A 03 03 3 6 2 Buffer type entry The display will show cae ue BUFFER SETUP MONF RESULTS The secondary display will show BUFFER and will then scroll BUFFER TYPE after 10 seconds Select the type of buffer from the options available by scrolling through the list using the Up Down arrows AUTO MAN JIS NIST or DIN AUTO relates to the Jenway buffer types supplied with the instrument KIT XT Ma Ja UFFER setur monr RESULTS The Left Right arrow keys and the CAL CLR key have no function during this set up Symbol will flash while adjustment is being made To accept the type of buffer selected press the STO key The symbol will disappear and the secondary display will momentarily show SAVED and the next set up menu option will be displayed If MANUAL buffer entry is selected the display will show SAVED and then the screen will update to show amA E A a EAL 4 SETUP RESULTS with the first digit of the value flashing Adjustment of the flashing digit can be made using the Up Down arrow keys The Left Right arrow keys are used to select the next adjusting digit which will flash when s
14. L SAITO E Cid 190 5 OrE IJU setur mone RESULTS If a successful point calibration has been performed the secondary display will momentarily show CAL OK The slope value from the calibration will be displayed The instrument will then update the display Rinse the electrode s in deionised water If the instrument fails a calibration the error message EO will be shown and ERROR SLOPE OUTSIDE LIMITS will scroll along the secondary display 3 8 Error Codes ERROR EO OUTSIDE LIMITS This error message will be displayed when the mV value for a buffer is more or less than 30mV from the ideal Nernstian value ERROR SLOPE OUTSIDE LIMITS This error message is displayed when the slope value is outside the range of 75 125 UNABLE TO RECOGNISE BUFFER This error message will be displayed when the buffer value is more than 0 5 pH units from the set value 17 351 050 REV A 03 03 3 9 Millivolt Mode Absolute Millivolts When this mode is selected the unit will display the actual voltage developed by the electrode when it is immersed in a solution containing ions to which the electrode is sensitive The electrode may be a combination type or a suitable sensing reference pair depending on the specific test being carried out pH Redox and lon Selective electrodes can all be used in this mode Most of these determinations will require the preparation of calibration curves or other analytical methods to enable the mV read
15. Model 3510 pH mV Temperature Meter Operating Manual 351 050 REV A 03 03 Safety Please read this information carefully prior to installing or using this equipment 1 The unit described in this manual is designed to be operated only by trained personnel Any adjustments maintenance and repair must be carried out as defined in this manual by a person qualified to be aware of the hazards involved 2 Itis essential that both operating and service personnel employ a safe system of work in addition to the detailed instructions specified in this manual 3 References should always be made to the Health amp Safety data supplied with any chemicals used Generally accepted laboratory procedures for safe handling of chemicals should be employed 4 If it is suspected that safety protection has been impaired in any way the unit must be made inoperative and secured against any intended operation The fault condition should immediately be reported to the appropriate servicing authority 351 050 REV A 03 03 Contents Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Model 3510 pH mV Temperature Meter Operating Manual Introduction Instrument Description Instrument Specification Installation Unpacking Installation Displays Keypad Inputs Outputs Operation Theory of pH measurement pH Measurement Preparation of Buffer Solution Solution Temperature Values Good Practice Guidelines Instru
16. ORY o N SLOPE IDO mVEo os e Symbol displayed during set up of instrument parameters Primary display 4 digit Provides direct readout in pH and millivolts of samples and standards Mode annunciators shows selected measurement mode pH mV Absolute and Relative Calibration point shows 1 2 or 3 point symbol depending on level of calibration selected by the user Buffer selection indicates whether the instrument is using manually entered or automatic selection buffers Will show which type of buffer is being used Endpoint symbol this symbol is displayed when the pH changes by less than 0 005pH 0 2mV over a five second period Once an endpoint has been detected the reading must change by more than 0 005pH 0 2mV to clear the endpoint symbol Secondary display 6 digit display Provides direct readout of automatic or manual temperature Scrolls and displays selected parameter information in set up mode Mode annunciators indicates temperature in C or F and whether the measurements are manually or automatically temperature compensated Status display 21 2 digit Provides information relating to electrode slope value mV Eo value at calibration and memory result number Mode tags Each mode tag is highlighted when selected SETUP MODE or RESULTS 3 351 050 REV A 03 03 2 4 Keypad 2 4 1 Keypad 1 ESC 2 CAL CLR 3 Print key 4 Up Arrow 5 Down Arrow 6 Left
17. crements the memory index the Down arrow decrements the memory index The Left arrow exits to the main measurement display The Right arrow and STO keys do not function CAL CLR deletes the current memory location The secondary display scrolls DELETED Holding the CAL CLR key until after DELETED is displayed on the screen will delete all readings The secondary display will then scroll ALL RECORDS DELETED If no readings have been stored the secondary display will show EMPTY To exit this mode press the ESC key If the memory is full the secondary display will show FULL 20 351 050 REV A 03 03 Section 4 Maintenance 4 1 General The Model 3510 is designed to give optimum performance with minimum maintenance It is only necessary to keep the external surfaces clean and free from dust To give added protection when not in use the unit should be switched off and covered with the optional dust cover 060 406 4 2 Cleaning Re conditioning of Combination Electrodes For general purpose use combination electrodes can be cleaned with a mild detergent solution or a commercial glass cleaning solution provided these are not strongly acidic The electrode surface should be wiped with a clean cloth soaked in the cleaning agent and or allow the membrane to stand in the solution until clean Rinse and repeat as necessary Electrodes which have been allowed to dry out should be soaked overnight in warm distilled water Table of Cleaning Agents for
18. elected Once the full reading has been adjusted to the correct value press the STO key If a 1 point calibration only is being performed the instrument display will update and show the pH Resolution set up menu 10 351 050 REV A 03 03 If a 2 or 3 point calibration is being performed the display will move on to the 2 and then 3 point calibration buffer set up screens UDO LALALA AA LILI LI VS LIU Chie CAL 3 setup mone RESULTS SETUP MODE RESULTS The correct values should be entered and saved as for the 1 point calibration When all chosen buffer types have been entered and confirmed the instrument display will update to show the next set up menu option To exit the set up menus at any time press the ESC key This will return the instrument to the MODE menu 3 6 3 pH resolution Note Setting the pH resolution will affect the resolution on the main instrument display Manual buffer entry is always shown to 3 decimal places The display will show gt e 1 Lis PH PES serue The secondary display will show PH RES and will then scroll PH RESOLUTION after 10 seconds Select the preferred resolution from the options 0 001 0 01 or 0 1 using the Up Down arrows The Left Right arrow keys and the CAL CLR key have no function during this set up Symbol will flash while adjustment is being made v To accept the selected resolution press the STO key The symbol will disappear and the secondary d
19. er the manufacturers instructions When using manual temperature compensation no ATC probe fitted the solution temperature should be measured and the value entered in the set up menu prior to calibrating the instrument refer 3 6 5 The buffer solutions should all be at the same temperature 1 Select the pH measuring mode using the Up Down arrows which toggle between pH and mV modes Press the CAL key The primary display will show the current pH reading The main display annunciators will indicate CAL 1 and the buffer type being used The secondary display will show the manually set temperature reading in C or F When manual temperature compensation is being used the annunciator will indicate MAN The status display will indicate the slope value 2 CAL 1 Immerse the electrode s in the first buffer solution and allow the instrument to stabilise When no pH change of less than 0 005pH is detected over a five second period the endpoint symbol will be displayed Press the CAL or STO key A IAN cal MAN me E DS an 2 100 suora lu setup mone If a successful point calibration has been performed the secondary display will momentarily show CAL OK The instrument will then update the display The display will then show the next part of the calibration sequence if a 2 and or 3 point calibration has been selected If a 1 point calibration only is required the instrument will return to the main measuring screen Eo is shown on
20. he Set Up menu 4 pH Measurement a Perform a calibration sequence using manual or automatic temperature compensation b Immerse the electrode s into the solution to be measured and note the results once the reading has stabilised NOTE Ensure the pH Reference probe combination are compatible with the samples being measured Non compatibility may be indicated by drifting readings noise or shortened electrode life During use the electrode must be rinsed between each measurement to eliminate contamination of solutions Excess droplets of solution may be removed by gently blotting with filter paper or tissue For further details refer to Section 3 5 Good Practice Guidelines 19 351 050 REV A 03 03 3 11 Results storage and display To store the current displayed result press the STO key The instrument display will momentarily show STORED on the secondary display The memory location will be given on the status display Up to 32 results can be stored Each result will be stored in the next available memory location ANT 4 NO q TM Y z i OR Za MOR fl MODE The instrument will store Primary pH or mV readings Temperature readings and the unit of measurement C or F MAN if manual temperature measurement is used Endpoint symbol REL if relative mV is selected Selecting the RESULTS menu displays the reading stored at the displayed memory location moi YUU h Cau MEMO TY J SETUP RESULTS The Up arrow in
21. ht b in a vertical position c within their specified temperature range Always ensure the electrode is used within its specified temperature range Degradation of electrodes used above their specified temperature is rapid and irreversible Ensure the level of fill solution is above the internal elements in the electrode and that this level remains above the sample in use Note Some epoxy gel filled electrodes are not refillable DO NOT touch the sensitive glass pH membrane or reference junction during use Excess droplets of solution may be removed by gently blotting with filter paper or tissue DO NOT rub the electrode as this may induce an electrostatic charge Ensure no air bubbles are trapped at the bottom of the electrode Removal of air bubbles is possible by holding the electrode vertically and gently tapping the electrode body Larger bubbles may be removed by shaking the electrode in a downward direction During use ensure the electrode is rinsed in deionised water between each measurement to eliminate risk of contamination of solutions Ensure that the side port inlet if present is uncovered especially during a long run of tests For samples such as blood serum or any measurements of Tris buffer solutions the junction may become badly clogged For these measurements it is recommended that the Tris buffer electrode is used 924 030 For applications associated with the measurement of food extracts it is recommended that the
22. ial 5 Output Socket 9 way socket for RS232 connection 6 Power In AC 9V I P socket 2 1 x 5 5mm socket allowing the power supply to be connected to the instrument 5 351 050 REV A 03 03 Section 3 Operation 3 1 Theory of pH Measurement pH is a unit of measurement which defines the degree of acidity or alkalinity of a solution It is usu ally measured on a scale of 0 to 14 The pH value quantifies the degree of hydrogen ion activity of an acid or a base in terms of hydrogen ion activity The internationally accepted symbol pH is derived from p the mathematical symbol of the negative logarithm and H the chemical symbol for Hydrogen The pH value is the negative logarithm of Hydrogen ion activity as shown in the mathematical relationship pH log H The pH value of a substance is directly related to the ratio of the Hydrogen ion H and the Hydroxyl ion OH concentrations If the concentration of H is greater than OH the material is acidic and has a pH value of less than 7 Conversely if the concentration of OH is greater than H the material is basic with a pH value greater than 7 If the concentrations of Ht and OH are equal the material is neutral with a pH value of 7 It can therefore be seen that pH is a measurement of both acidity and alkalinity even though by definition it is a selective measurement of hydrogen ion activity The logarithmic relationship between hydrogen ion concentration and the pH unit mea
23. ing to be converted to a concentration unit For further information on these determinations refer to the electrode instructions which will normally give details of calibration solutions interferences and the limits of the methodology A very useful application of the Absolute mV range is for monitoring the performance of standard pH electrodes Using accurate and fresh buffers at a constant temperature the millivolt output of the electrode should be noted and compared to the theoretical ideal As the electrode ages becomes contaminated or dirty these values will drift indicating that corrective action should be taken Recording these values as part of a routine Quality Control program can give a good indication of the condition of the electrode Relative Millivolts This mode is suitable for determinations using Redox and lon Selective Electrodes and has the additional benefit of being able to zero any offset voltage developed by the electrode in a blank solution i e a solution that has none of the ions to be measured but has all the other characteristics of the unknown samples A blank solution would normally have its ionic strength and pH adjusted as required for the electrode in use As the display is zeroed automatically when the Relative millivolt mode is selected it is necessary to immerse the electrode in the blank solution with the Absolute mV mode selected When the reading has stabilised the Relative mV mode should then be selected
24. isplay will momentarily show SAVED and the next set up menu option will be displayed To exit the set up menus at any time press the ESC key This will return the instrument to the MODE menu 11 351 050 REV A 03 03 3 6 4 Temperature units The display will show SETUP MONF RESU LTS The secondary display will show UNITS and will then scroll TEMPERATURE UNITS after 10 seconds Select C or F using the Up Down arrows The Left Right arrow keys and the CAL CLR key have no function during this set up A vy To accept C or F press the STO key The symbol will disappear and the secondary display will momentarily show SAVED and the next set up menu option will be displayed Symbol will flash while adjustment is being made To exit the set up menus press the ESC key at any time This will return the instrument to the MODE menu 3 6 5 Manual temperature If the ATC probe is not connected to the instrument the display will show EU MAN Of setur mone results The secondary display will show MAN C or F and will then scroll MANUAL TEMPERATURE C or P Measure the temperature of the buffer solutions s to be used and adjust the displayed reading to these values Adjustment of the flashing digit can be made using the Up Down arrow keys The Left Right arrow keys are used to select the next adjusting digit which will flash when selected Once the reading has been adjusted to the correct value
25. ment Set Up pH Calibration Error Codes mV Mode Performing Measurements Results Storage and Display Maintenance General Cleaning Re conditioning of Glass Electrodes Optional Accessories Optional Accessories Spares Interfacing Analogue RS232 Keypad Emulation Printing Troubleshooting Troubleshooting Functional checks EC Declaration of Conformity ili E Ni 2 1 2 2 2 3 2 4 2 5 5 1 5 2 6 1 6 2 6 3 6 4 7 1 7 2 351 050 REV A 03 03 Section 1 1 1 Instrument Description Introduction The Model 3510 is a general purpose pH mV Temperature bench meter used for routine laboratory analysis The meter supports 1 2 or 3 point pH calibration on either manually entered pH buffer values or automatically temperature compensated buffers to DIN JIS and NIST standards and Jenway buffers supplied with the instrument Up to 3 decimal place resolution is available The 3510 includes a 32 reading memory facility 1 2 Instrument Specification pH 1 2 or 3 point cal Range Resolution Accuracy mV Absolute or Relative Range Resolution Accuracy Input Impedance Temperature Measuring Ranges Resolution Accuracy ATC Range Manual Temp Compensation Auto Buffer Selection Calibration Outputs Display Power Size Weight 2 000 to 16 000pH 0 001 0 01 0 1pH 0 003pH 1999 to 1999mV 0 1mV 0 2mV gt 10 ohms 10 to 105 C 14 to 221 F 0 1 1 F 0 5
26. ns that a change of one pH unit represents a ten fold change in hydrogen ion concentration 3 2 pH Measurement pH can be measured by using either pH papers indicators or a pH meter dependent on the level of accuracy required pH papers or indicators change colour as the pH level varies These can be used as a guide to the pH level but can be limited in accuracy and difficult to interpret correctly in murky or coloured samples For greater accuracy the use of a high impedance pH meter is recommended together with a pH measuring electrode and reference electrode Each component part of the measurement system can be described as follows a the pH meter is a high impedance amplifier used to accurately measure the minute electrode voltages produced The pH meter will display the results directly in pH units on either an analogue or digital display Voltages can also be read for special applications ORP Oxidation Reduction Potential measurements or with lon Selective Electrodes b the pH electrode is a hydrogen ion sensitive glass bulb with a millivolt output that varies with the changes in the relative hydrogen ion concentration inside and outside of the bulb The pH electrode has very high internal resistance making the voltage change with pH difficult to measure The input impedance of the pH meter and leakage resistances are therefore important factors c the reference electrode these cells consist of an internal element us
27. on has been performed the secondary display will momentarily show CAL OK The instrument will then update the display The display will then show the next part of the calibration sequence if a 2 and 3 point calibration has been selected If a 1 point calibration only is required the instrument will display the Eo value on the status screen and then return to the main measuring screen Rinse the electrode s in deionised water 3 CAL 2 Immerse the electrode s in the second buffer solution and allow the instrument to stabi lise When no change in the least significant display digit is detected over a five second period the endpoint symbol will be displayed Press the CAL or STO key 4U aja Lu CAI 2 l Te aa oe ATE SLOPE Mu y SETUP monF If a successful calibration has been performed the secondary display will momentarily show CAL OK The instrument will then update the display The display will then show the next part of the calibration sequence if a 3 point calibration has been selected If a 2 point calibration only is required the instrument will return to the main measuring screen Rinse the electrode s in deionised water 16 351 050 REV A 03 03 4 CAL 3 Immerse the electrode s in the third buffer solution and allow the instrument to stabilise When no change in the least significant display digit is detected over a five second period the endpoint symbol will be displayed Press the CAL or STO key INT MUSLOS ye DA
28. t located on the rear panel of the instrument To intiate a print out of data press the print key When the first print is performed a header section will be printed showing Instrument name Spacing for entry of Operator amp User ID Most recent calibration information Eo value Slope efficiency Buffer type This will be followed by results data in either pH or mV dependent on mode selected Details will also be given on temperature An asterisk indicates that manual temperature compensation is being used A reading in the Relative mV mode will be indicated by an R Each reading will be numbered sequentially A calibration will reset the data number to 0001 and the header information will be re printed To obtain a print out of stored readings enter the RESULTS MODE and press the print key A print out of all 32 print locations will then be generated 25 351 050 REV A 03 03 6 4 1 Example Printout 3510 Header printout Eo 7 01pH 425 07C 8 8nV Slope Efficiency 101 4 Buffer Recognition Auto _ oo ua ee we eee II Am 7 00pH 25 0 C 7 02pH 25 0 C 7 02pH 25 0 C 7 02pH 2 0 7 02pH 25 070 7 02pH 25 0 7 02pH 25 0 7 02pH 25 9 7 02pH 25 0 C 7 02pH 25 0 to 7 0 pH 25 00 t 7 02pH 25 09 t FOI 23 7 C e 7 D00pH 24 5 7 00pH 3 80 7 004 23 5 0 t 7 00pH 25 5 C amp 7 00pH 23 4 C 7 00p4 23 4 7 00p4 EM s i 3 5m 26 3510 Results printout 0001 7 64iph
29. that correct 9V ac power supply is connected and switched on Unit must be used with supplied 9V acpower supply Usage of other units will cause the 3510 not to operate Use BNC cap to test 3510 see 7 2 Replace electrode Use BNC cap to test 3510 see 7 2 Replace electrode Use freshly prepared buffers Use BNC cap to test 3510 see 7 2 Replace electrode Is the buffer type correct Use AUTO for Jenway supplied buffers Replace buffers Use BNC cap to test 3510 see 7 2 Replace electrode Check 3510 using section 7 2 Replace temperature probe Check 3510 using section 7 2 Replace temperature probe Set meter to read C and set temperature against a calibrated thermometer 3510 requires the RS232 cable to connect the printer The feed light on the printer will flash if the unit requires paper Connect ac power supply If the above does not answer your query try the FAQ section on the www Jenway com Website 27 351 050 REV A 03 03 7 2 Functional check The measurement function of the meter can be checked using the enclosed BNC shorting cap 009 146 1 Remove the ATC probe if connected 2 Set Manual temperature compensation to 25 C 3 Remove pH probe and replace with BNC shorting cap 4 Select mV mode the display should read 1 If the mV reading is greater than 1mV perform a reset refer Section 7 3 To make measurements from this point refit the ATC probe and pH probe and calibrate the
30. the status display Rinse the electrode s in deionised water 3 CAL 2 Immerse the electrode s in the second buffer solution and allow the instrument to stabilise When no pH change of less than 0 005pH is detected over a five second period the endpoint symbol will be displayed Press the CAL or STO key The slope value is shown on the status display Dall E 2 5 Civ HAR SLOTE LU 14 351 050 REV A 03 03 If a successful calibration has been performed the secondary display will momentarily show CAL OK The instrument will then update the display The display will then show the next part of the calibration sequence if a 3 point calibration has been selected If a 2 point calibration only is required the instrument will return to the main measuring screen Rinse the electrode s in deionised water 4 CAL 3 Immerse the electrode s in the third buffer solution and allow the instrument to stabilise When no change in the least significant display digit is detected over a five second period the endpoint symbol will be displayed Press the CAL or STO key CAI MAN m ES O O Oman Sore IS E A If a successful point calibration has been performed the secondary display will momentarily show CAL OK The instrument will then update the display Rinse the electrode s in deionised water Once a successful calibration has been completed the instrument will return to the measuring mode The instrument is then ready to undertake the
31. ually a silver silver chloride wire electrolyte KCI and a liquid junction The liquid junction provides a leak path for the internal electrolyte to weep into the sample chamber and provide an electrical contact with the liquid to be measured If the liquid junction is inefficient then measurement will be inaccurate It is common for the reference electrode to be incorporated into the pH electrode It is then called a combination electrode The Model 3510 meter is supplied with a combination electrode 6 351 050 REV A 03 03 The voltage developed by each individual pH electrode in the presence of a known hydrogen ion concentration is theoretically predictable but in practise deviations from the theoretical value can be expected These deviations will change slowly during the life of an electrode It is therefore essential to routinely calibrate the system using solutions with a known and constant pH value These solutions are called buffers 3 3 Preparation of Buffer Solutions Care must be taken in the preparation of all buffer solutions The correct quantity of distilled or deionised water should be used when preparing the solutions For accurate and repeatable results it is essential to follow the manufacturers instructions carefully 3 4 Solution Temperature Values The value of all buffer solutions varies with solution temperature For accurate calibration of electrodes using buffer solutions it is necessary to measure the temperature
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