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jenway 4520 Operating Manual

Conductivity/tds meter
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Model 4520
Conductivity/TDS Meter
Operating Manual
REV B/07-09

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  • Page 1 Model 4520 Conductivity/TDS Meter Operating Manual REV B/07-09...

  • Page 3: Table Of Contents

    Contents Safety SECTION 1 - Introduction Instrument Description Instrument Specification SECTION 2 - Installation Unpacking Installation Display Controls Inputs/Outputs SECTION 3 - Theory and Practice of Conductivity Measurements Theory of Conductivity Measurement Conductivity Measurements Preparation of Standard Buffer Solutions Solution Temperature Values Good Practice Guidelines SECTION 4 - Operation Setup Parameters...

  • Page 4: Safety

    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.

  • Page 5: Section 1 - Introduction

    SECTION 1 - Introduction INSTruMENT DESCrIPTION The 4520 is a fully specified laboratory conductivity/resistivity/TDS/salinity/temperature meter that includes full support for good laboratory practices (GLP). The meter supports 1, 2 or 3 point conductivity calibration. Powerful data logging capabilities are included with the ability to store up to 500 readings either manually, at timed intervals or on alarmed events.

  • Page 6: Section 2 - Installation

    Any shortages or damage should be reported immediately to the manufacturer or your local distributor. INSTALLATION The Model 4520 is supplied ready to use. Connect the conductivity cell to the rear panel DIN socket. The electrode stand requires minimal assembly (refer to the diagram below).

  • Page 7: Display

    DISPLAy Fig. 2.3.1 - Display 1. Primary display digit. Provides direct readout in conductivity, TDS, resistivity or salinity of a sample or standard solution. 2. Mode annunciators Shows the unit of measurement for the displayed reading. 3. Secondary display digit display. Provides direct readout of automatic or manual temperature. 4.

  • Page 8: Controls

    CONTrOLS Fig. 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.

  • Page 9: Inputs/Outputs

    2 x 4mm sockets. Allows the analogue reading of the meter to be recorded externally on a suitable device. 6. IrDA (not shown) Infra red printer output located on he right hand side of the 4520 allows a wireless connection to be made to the 037 701 printer.

  • Page 10: Section 3 - Theory And Practice Of Conductivity Measurement

    SECTION 3 - Theory and Practice of Conductivity Measurement ThEOry OF CONDuCTIvITy MEASurEMENT In general, the measurement of conductivity is a rapid and inexpensive way of determining the ionic strength or concentration of a solution. Conductivity is the ability of a solution to pass electrical current. As electricity is a flow of electrons, any charged particles (ions) in a solution will conduct this electricity and the amount of current flowing will be proportional to the number of ions present in the conducting solution.

  • Page 11: Preparation Of Standard Buffer Solutions

    Salinity The 4520 uses a quadratic equation to calculate salinity (g/l) from the measured conductivity value (mS/cm). To measure samples with high salinity concentrations, a two-point calibration of the conductivity cell at 1413µS and 12.88mS is recommended.

  • Page 12: Solution Temperature Values

    SOLuTION TEMPErATurE vALuES The value of all standard buffer solutions varies with the solutions temperature. For the accurate calibration of cells it is necessary to adjust the temperature of the standard buffer solution being used to the specified reference temperature. The unit should then be calibrated to the conductivity value of the standard being used.
  • Page 13 Jenway recommends that the pure water conductivity cell (027 900) and the meter's ultra-pure water temperature correction feature is used in these applications, when available.

  • Page 14: Section 4 - Operation

    SECTION 4 - OPErATION SETuP PArAMETErS The following section details the setup modes available to the user on the main menu screen: Use the Up/Down arrow keys on the keypad to select the setting that is to be edited and use the right arrow key to highlight the current value for that setting.

  • Page 15: Temperature Setup

    4.1.1.1 TEMPErATurE SETuP Select the Temperature Setup sub menu by highlighting the option and pressing the STO key. The following menu will be shown: Temp units allows selection of the preferred unit of measurement (either °C or °F) using the Up/Down keys which toggle between the two units.
  • Page 16 Temp Correction the measurement of ultra-pure water is a major conductivity application, for this purpose the 4520 has a non-linear temperature compensation algorithm that can be used to report results conforming to BS/EN 2788, DIN 3840 sec 2.35 and BS6068.

  • Page 17: Alarms Setup

    Cal Buffer Set allows the selection of Auto Recognition or Manual Entry for the calibration standards by using the Up/Down arrow keys. Cal 1 Buffer (mS) allows the Cal 1 manual buffer value can be set by using the Left/ Right arrow keys to select the digit and the Up/Down arrow keys to set the digit to the required value.
  • Page 18 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 4520 after the time limit has elapsed. This option is DISABLED by default.

  • Page 19: Security Setup

    and backward movement along the row of digits. Press the STO key to accept the value. Cal reminder Audible Alarm can be enabled or disabled by using the Up/Down arrow keys which toggle between the two settings. user ID up to a 4 digit code can be set using the Up/Down arrow keys. The Left/Right arrow keys allow forward and backward movement along the row of digits.

  • Page 20: Data Logging Setup

    Results and Deletes Results Since. Selection is made via the Up/ Down arrow keys which toggle between the four settings. 4.1.5.1 rESuLTS STOrAGE AND DISPLAy The 4520 conductivity meter has a variety of options relating to the storage of data.
  • Page 21 Disabled no data logging is possible when this option is selected. The 4520 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 22: Printer Setup

    4.1.5.2 PrINTEr SETuP Select the Printer Setup sub menu by highlighting the option and pressing the STO key. The following menu will be shown: Exit enables the user to exit the setup menu and return to the Data logging Setup screen. Printer Interface toggles between Infrared and Serial.

  • Page 23: Clock Setup

    4.1.7 CLOCk SET uP Select the Clock Setup sub menu by highlighting the option and pressing the STO key. The following screens will be shown: Exit enables the user to exit the setup menu and return to the main instrument display. Display toggles between Time and Date.

  • Page 24: Instrument Calibration

    INSTruMENT CALIBrATION There are three methods that can be used to calibrate the conductivity function of the 4520 meter. The simplest method is to set the cell constant (K factor) in the setup menu (see Section 4.2.1). Alternatively a 1, 2 or 3 point calibration can be carried out against any of the four automatically recognised standard buffer solutions (see Section 4.2.2).
  • Page 25 4.2.3 MANuAL CALIBrATION WITh STANDArD BuFFEr SOLuTIONS The following procedure can be used to calibrate the 4520 with standard buffer solutions which have conductivity values that are not automatically recognised by the 4520. 1. Connect a standard conductivity cell to the meter.

  • Page 26: Performing Measurements

    PErFOrMING MEASurEMENTS The 4520 should be calibrated before performing measurements of conductivity, TDS, resistivity or salinity (see Section 4.2). The following procedures should then be followed for each of the measurement modes: 1.

  • Page 27: Status Page

    a) If further samples are to be measured, rinse the cell thoroughly in between each sample with deionised water. On completion of sample measurement the cell should be thoroughly rinsed in deionised water. To obtain optimum performance see Section 3.5 - Good Practice Guidelines. STATuS PAGE The status page displays the current calibration information.
  • Page 28 Other screens of data can be accessed using the Up/Down arrow keys. The CLR key will delete data according to the set mode (see Section 4.1.5.1) If the PROMPT BEFORE DELETING warning is set then a warning message is displayed to indicate the data that is about to be deleted.

  • Page 29: Section 5 - Maintenance

    SECTION 5 - Maintenance GENErAL The Model 4520 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 the unit is not in use the unit should be disconnected from the mains supply and covered with the optional dust cover (060 406).

  • Page 30: Section 6 - Optional Accessories

    SECTION 6 - Optional Accessories OPTIONAL ACCESSOrIES The following list of items are available as optional accessories for use with the Model 4520: 060 406 Dust cover 037 701 IrDA printer supplied with roll of thermal paper, serial connection lead, power...

  • Page 31: Section 7 - 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 4520 TXD 3 OUTPUT FROM 4520 DTR 4 LINKED TO DCD AND DSR...

  • Page 32: Keypad Emulation

    Enter / Store PrINTING A 32 column serial printer (037 701) is available for use with the Model 4520. There are two methods of connecting the serial printer to the Model 4520: a) IrDA - the IrDA interface is a line of sight, wireless communication protocol. The IrDA sensor (located on the front left hand corner of the printer) should be in line with the Ir window on the side of the 4520.

  • Page 33: Alarm Outputs

    The 4520 provides two alarm outputs. These can be accessed using the two 4mm connectors on the rear of the 4520. They are open collector outputs. To set the alarm limits at which these are activated, please refer to section 4.1.3.

  • Page 34: Section 8 - Troubleshooting And Functional Checks

    Erratic display Check power supply Unit must be used with supplied 9V AC power supply. Usage of other units will cause the 4520 not to operate Unstable display Conductivity cell defective Replace conductivity cell Display permanently Faulty connection Check cell connection to 4520.

  • Page 35: Functional Checks

    ATC function and both resistors are used together for checking the conductivity function. Temperature Input Check 1. Disconnect all inputs from the 4520 except the power supply. The display should indicate 25.0˚C Man (or the temperature entered as the manual temperature value in the Temperature Setup… menu) 2.

  • Page 36: Reset Procedure

    8. The conductivity reading should be between 180 and 220µS. If this functions correctly then any problem is most likely to be associated with the cell – if it fails to work correctly contact your local distributor or Jenway for service advice. rESET PrOCEDurE NOTE: Performing a reset will return all options to the default values.

  • Page 37: Ec Declaration Of Conformity

    London E14 3BS Registered No. 6381141 BS EN ISO 9001: 2000 registered company EC Declaration of Conformity JENWAY Model 4520 Conductivity/TDS Meter complies with the following European Standards: EN 61326:1998 Electromagnetic compatibility - Electrical equipment for measurement, control and laboratory use.
  • Page 40 Bibby Scientific Ltd Bibby Scientific France SAS Bibby Scientific Italia Srl Beacon Road Stone ZI du Rocher Vert - BP 79 Via Alcide de Gasperi 56 Staffordshire ST15 0SA 77793 Nemours Cedex 20077 Riozzo di Cerro al Lambro United Kingdom France Milano Italia Tel: +44 (0)1785 812121...

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