jenway 3520 Instruction Manual
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jenway 3520 Instruction Manual

Ph/mv temperature meter
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pH/mV Temperature Meter
Model 3520

Instruction Manual

352 050/REV B/01-17

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Summary of Contents for jenway 3520

  • Page 1: Instruction Manual

    Temperature Meter Model 3520 Instruction Manual 352 050/REV B/01-17...
  • Page 3 Safety Please read this information carefully prior to installing or using this equipment. 1. The unit described in this manual is designed 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.
  • Page 4 Bitte lesen Sie diese Hinweise vor Installation oder Gebrauch dieser Ausrüstung sorgfältig durch. 1. Das in diesem Handbuch beschriebene Gerät darf nur von geschultem Personal bedient werden. Alle Anpassungen, Wartungsarbeiten und Reparaturen müssen entsprechend der Vorgaben in diesem Handbuch und von einer kompetenten Person, die mit den damit verbundenen Gefahren vertraut ist, durchgeführt werden.
  • Page 5 5. Nel caso in cui si sospetti che la salute possa essere pregiudicata in qualsiasi modo, disattivare l'unità per renderla inutilizzabile. Qualsiasi condizione di errore deve essere immediatamente segnalata al responsabile per la manutenzione. Lea esta información atentamente antes de instalar o utilizar este equipo. 1.

  • Page 6: Table Of Contents

    Model 3520 pH/mV/Temperature Meter Operating Manual Contents Section 1 Introduction Instrument Description Instrument Specification Section 2 Installation Unpacking Installation Displays/Controls Inputs/Outputs Section 3 Operation Theory of pH measurement pH Measurement Preparation of Buffer Solution Solution Temperature Values Good Practice Guidelines...

  • Page 7: Introduction

    Introduction 1.1 Instrument Description The Model 3520 is a fully specified laboratory pH/mV/Temperature meter that includes full support for good laboratory practices (GLP). The meter supports 1, 2 or 3 point pH calibration on either manually entered pH buffers or automatically temperature compensated buffers to DIN, JIS and NIST standards.

  • Page 8: Installation

    2.2 Installation The Model 3520 is supplied ready to use. Connect the ATC (if required) and the pH electrode to the rear panel Temp and pH sockets. The unit should be placed on a clean flat surface which is free from drafts and vibrations. The units are designed for operation on 120V to 240V AC input at 50 to 60Hz.
  • Page 9 2.3 Display Fig. 2.3.1 – Display Primary display – 4½ digit. Provides direct readout in pH and millivolts of samples and standards. Mode annunciators – shows selected measurement mode; pH, mV (Absolute and Relative). Secondary display – 3½ digit display. Provides direct readout of automatic or manual temperature.
  • Page 10 2.4 Keypad 2.4.1 Keypad 1. ESC 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. 2. CAL / CLR used to select and perform a calibration sequence. This key is also used to clear readings from Memory.

  • Page 11: Inputs/Outputs

    2.5 Inputs/Outputs Fig. 2.5.1 – Rear panel layout 1. Ref Socket 2mm pin socket. Connection socket for separate reference electrode. When performing measurements with some pH and ion 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.

  • Page 12: Operation

    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 3520 is supplied with a combination electrode. 352 050/REV A/03-03...

  • Page 13: Preparation Of Buffer Solution

    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.

  • Page 14: Good Practice Guidelines

    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;...

  • Page 15: Set-Up Parameters

    3.6 Set Up Parameters The following section details the set-up modes available to the user on the main set up menu screen: 3.6.1 Instrument Setup This option will allow the following parameters to be set: Exit allows the user to exit this menu. pH Resolution allows the user to select the preferred resolution for the samples under test.
  • Page 16 1, 2 or 3 point calibration. Cal Buffer Set allows selection to be made from the choice of buffer types available: Auto-Buffer (Jenway), Manual Entry, Auto-Buffer (JIS), Auto-Buffer (NIST) or Auto-Buffer (DIN). Manual Cal 1 allows Cal 1 manual buffer value to be set using the Up/Down keys. The Left/Right arrow keys allow forward and backward movement along the row of digits.
  • Page 17 3.6.4 Alarms Setup... Exit enables the user to exit the Setup menu and return to the main set up screen. Alarm Outputs can be enabled or disabled by using the Up/Down keys which toggle between the two settings. Audible Alarm Warning can be enabled or disabled by using the Up/Down keys which toggle between the two settings.
  • Page 18 Batch ID up to a 3 digit code can be set by using the Up/Down keys.The Left/ Right arrow keys allow forward and backward movement along the row of digits. Press the STO key to accept the value. 3.6.6.Security Setup … Select the Security Setup sub menu buy highlighting the option and pressing the STO key.
  • Page 19 Data Log Interval can be set between 00:00:01 and 23:59:59. Memory Full gives the user to select the Stop (cease storing results and not to overwrite existing stored information) or Overwrite (overwrite existing results) options when the memory is full. Selection is made via the Up/Down keys which toggle between the two settings.
  • Page 20 3.6.9 Endpoint Detection Set up … Exit enables the user to exit the Set Up menu and return to the main instrument display. Endpoint detection can be enabled or disabled by using the Up/Down keys which toggle between the two settings. Endpoint Audible Alarm can be enabled or disabled by using the Up/Down keys which toggle between the two settings.

  • Page 21: Ph Calibration

    3.7 pH Calibration 3.7.1 Calibration with pH Buffers - 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 per 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).
  • Page 22 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. The symbol display will show: where 2/3 is the number of calibration points selected.
  • Page 23 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 measurement of unknown solutions. If the tempera- ture of the unknown solution differs from the buffer, the Temperature Set up menu should be used to set the instrument display to the temperature of the unknown solution.
  • Page 24 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. The symbol display will show: where 2/3 is the number of calibration points selected.

  • Page 25: Error Codes

    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 measurement of unknown solutions. If the tempera- ture of the unknown solution differs from the buffer, the Temperature Set up menu should be used to set the instrument display to the temperature of the unknown solution.
  • Page 26 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.

  • Page 27: Performing Measurements

    3.10 Performing Measurements To perform measurements in pH, mV or temperature modes the following should be carried out: 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.

  • Page 28: Status Page

    3.11 Status Page The Status page displays the current calibration information. If no valid calibration data is stored (e.g. after a reset or a failed calibration) the warning screen: will be shown. The status page will show the calibration data in the order it was carried out. Date, time, temperature, mV and pH readings will be displayed for each buffer.

  • Page 29: Results Storage And Display

    Disabled - no data logging is possible when this option is selected. The 3520 can log to either the memory or the printer. The memory can hold 500 data points which can be accessed via the Results screen. When the memory is full there are two options available regarding any additional logging. The default is STOP.
  • Page 30 Disabled - no manual deleting of results is possible. Deletes Results Before - deletes all results before the selected data point. Delete Results Since - deletes all results since the selected data points. Deletes All Results - deletes all stored results. 3.12.1 Accessing Stored Results To access results which have been stored use the Right arrow key to select results.

  • Page 31: Glp Functions

    A reminder that calibration is due can be set via the Cal Reminder option. Once this option is set a valid calibration is required to use the 3520 after the time limit has elapsed. This option is DISABLED by default.

  • Page 32: Maintenance

    Maintenance 4.1 General The Model 3520 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.

  • Page 33: Optional Accessories Optional Accessories

    Section 5 Section 5 Optional Accessories 5.1 Optional Accessories Optional Accessories The following list of items are available as optional accessories for use with the Model 3520: 5.1 Optional Accessories 060 406 060 406 Dust Cover The following list of items are available as optional accessories for use with the Model 3520:...

  • Page 34: Interfacing

    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 3520 TXD 3 - OUTPUT FROM 3520 DTR 4 - LINKED TO DCD AND DSR...

  • Page 35: Keypad Emulation

    Pressing the PRINT key outputs from the RS232 interface. Sending an ASCII “D” to the 3520 causes a printout of the current displayed reading plus sample number. Sending an ASCII “C” causes a printout of the last calibration parameters.

  • Page 36: Printing

    The 3520 provides two alarm outputs. These can be accessed using the two 4mm connectors on the rear of the 3520. They are open collector outputs. To set the alarm limts at which these are activated, please refer to section 3.6.4.

  • Page 37: Troubleshooting

    Usage of other units will cause the 3520 not to operate. Drifting erratic readings Electrode fault Use BNC cap to test 3520 (see 7.2) Replace electrode. Cannot calibrate Electrode Fault Use BNC cap to test 3520 (see 7.2) Replace electrode.

  • Page 38: Functional Checks

    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 3520 using fresh buffer solutions (see section 3.6).
  • Page 39 and so we cannot guarantee that interference will not This product meets the applicable EC harmonised standards for radio frequency occur in practice. Where there is a possibility that injury, interference and may be expected not to damage or loss might occur if equipment malfunctions interfere with, or be a ected by, other equipment with due to radio frequency interference, or for general similar quali cations.
  • Page 40 Cole-Parmer Ltd Beacon Road, Stone, Staffordshire, ST15 0SA, United Kingdom Tel: +44 (0)1785 812121 Email: cpinfo@coleparmer.com Web: www.jenway.com...

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