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SCHOTT Instruments handylab LF 11 Operating Manual

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Operating manual
Conductivity Meter
ba75365d04
01/2011

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Summary of Contents for SCHOTT Instruments handylab LF 11

  • Page 1 Operating manual handylab LF 11 Conductivity Meter ba75365d04 01/2011...
  • Page 2 LF 11 Accuracy when The use of advanced technology and the high quality standard of our going to press instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Al- so, we cannot guarantee that there are absolutely no errors in this man- ual.

  • Page 3: Table Of Contents

    List of contents handylab LF 11 - List of contents Overview ......... 5 Keypad .
  • Page 4 List of contents handylab LF 11 ba75365e04 01/2011...

  • Page 5: Overview

    The handylab LF 11 provides the maximum degree of operating comfort, re- liability and measuring certainty for all applications. The proven procedure for adjusting or setting the cell constant and the spe- cial AutoRead function support you in your work with the handylab LF 11. Keypad Sample display...

  • Page 6: Keypad

    Overview handylab LF 11 Keypad RUN/ENTER Key functions Select the measuring mode <M>: – Conductivity/Resistivity – Salinity – Total dissolved solids (TDS) Switch measuring instrument on/off <ON/OFF> – Determine or set up the cell constant – Select temperature compensation <CAL>...

  • Page 7: Display

    LF 11 Overview Display Status display Sensor symbol mV/pH mg/l Meas. value display mbar M cm Time Baud Function and ° Day.Month No. ° Year Ident temperature display Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Jack field...

  • Page 8: Technical Data

    Overview handylab LF 11 Technical Data Dimensions Length [mm] and weight Width [mm] Height [mm] Weight [kg] Approx. 0.3 Mechanical Type of protection IP 66 structure Electrical safety Protective class Test certificates cETLus, CE Ambient Storage - 25 °C ... + 65 °C...
  • Page 9 LF 11 Overview ϰ Accuracy No compensation: 0.5 % (±1 digit) Resistivity Nonlinear compensation Precision Sample temperature ± 0.5 % 0 °C ... 35 °C according to EN 27 888; ± 0.5 % 35 °C ... 50 °C extended nLF function...
  • Page 10 Overview handylab LF 11 Power supply Batteries 4 x 1.5 V alkali-manganese batteries, Type Operational life Approx. 2500 operating hours (depending on conductivity) Applicable EC guideline 2004/108/EC guidelines and EN 61326-1 norms EN 61000-3-2 EN 61000-3-3 FCC Class A Instrument safety...

  • Page 11: Safety

    LF 11 Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the conductivity measur- ing instrument. Consequently, all responsible personnel must read this oper- ating manual before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system.

  • Page 12: General Safety Instructions

    Safety handylab LF 11 General safety instructions This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see section 1.4 T ECHNICAL It left the factory in a safe and secure technical condition.

  • Page 13: Commissioning

    LF 11 Commissioning Commissioning Scope of delivery Handheld meter, handylab LF 11 Operating manual and short operating manual 4 batteries, 1.5 V Mignon type AA (in the instrument) ba75365e04 01/2011...
  • Page 14 Commissioning handylab LF 11 ba75365e04 01/2011...

  • Page 15: Operation

    LF 11 Operation Operation Switching on the measuring instrument Connect a conductivity measuring cell to the measuring instrument. Press the <ON/OFF> key. The display test appears briefly on the display. Subsequently, the selected cell constant and the temperature com- pensation that was set up appear for approx.

  • Page 16: Measuring

    Operation handylab LF 11 Measuring 4.2.1 General information Preparatory Perform the following preparatory activities when you want to measure: activities Connect the conductivity measuring cell to the measuring instru- ment. In conjunction with the measuring cell, check or calibrate the measur- ing instument.

  • Page 17: Conductivity / Resistivity

    LF 11 Operation 4.2.2 Conductivity / Resistivity Note You can display measured values in the units μS/cm (conductivity) or MΩcm (resistivity). This setting is described in section 4.4 C ONFIGURATION Thus, you can carry out conductivity measurements or measurements of the resistivity: Perform the preparatory activities according to section 4.2.1.

  • Page 18: Salinity

    Operation handylab LF 11 4.2.3 Salinity You can measure the salinity as follows: Perform the preparatory activities according to section 4.2.1. Immerse the conductivity measuring cell in the test sample. Press the <M> key until Sal appears on the status display. The sa- linity value appears on the display.
  • Page 19 LF 11 Operation Wait for a stable measured value. AutoRead AR The AutoRead function (drift control) checks the stability of the measurement (drift control) signal. The stability has a considerable effect on the reproducibility of the measured value. Select the required measuring mode with <M>.

  • Page 20: Determining/Setting Up The Cell Constant [C]

    Operation handylab LF 11 Determining/setting up the cell constant [C] Why determine/set Aging slightly changes the characteristics of the cell, e. g. by coatings. As a up the cell result, an inexact measured value is displayed. The original characteristics of constant? the cell can often be restored by cleaning the cell.

  • Page 21: Determining The Cell Constant (Calibrating In The Control Standard)

    LF 11 Operation 4.3.1 Determining the cell constant (calibrating in the control standard) Note This method of automatically determining the cell constant by calibration with the 0.01 mol/l KCL standard solution can only be used for measuring cells with cell constants in the range 0.450 ... 0.500 cm or 0.800 ...
  • Page 22 Operation handylab LF 11 Press the <RUN/ENTER> key. – If no temperature sensor is connected, enter the current temperature of the solution with < > < > and confirm with <RUN/ENTER>. – If a temperature sensor is connected, the AR measurement to determine the cell constant starts.

  • Page 23: Setting The Cell Constant Manually

    LF 11 Operation 4.3.2 Setting the cell constant manually Note The cell constant to be set must either be taken from the operating manual of the measuring cell or is printed on the measuring cell. You can set the cell constant manually as follows: Range Press the <CAL>...
  • Page 24 Operation handylab LF 11 To return to the measuring mode: Press the <M> key. From now on, the cell constant 0.614 cm will be used. Range Press the <CAL> key repeatedly until CELL appears on the 0.090 ... 0.110 cm display.
  • Page 25 LF 11 Operation Setting the fixed You can set the fixed value 0.010 cm for the cell constant as follows: cell constant 0.010 cm Press the <CAL> key repeatedly until CELL appears on the display. mV/pH % mg/l mbar...

  • Page 26: Setting The Temperature Compensation Tc

    Operation handylab LF 11 4.3.3 Setting the temperature compensation TC The calculation of the temperature compensation is based on the preset ref- erence temperature, Tref 20 or Tref 25 (see section 4.4 C ONFIGURATION You can select one of the following temperature compensation methods:...
  • Page 27 LF 11 Operation Selecting the You can select the nonlinear temperature compensation as follows: nonlinear temperature Press the <CAL> key repeatedly until tc appears on the dis- compensation play. mV/pH % mg/l mbar Time Baud ° Day.Month No. °...
  • Page 28 Operation handylab LF 11 Selecting the You can select the linear temperature compensation as follows: linear temperature Press the <CAL> key repeatedly until tc appears on the display. compensation mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year...
  • Page 29 LF 11 Operation Switching the You can switch off the temperature compensation as follows: temperature compensation off Press the <CAL> key repeatedly until tc appears on the display. mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year...

  • Page 30: Configuration

    Operation handylab LF 11 Configuration You can adapt the measuring instrument to your individual requirements. To do this, the following parameters can be changed (the status on delivery is marked in bold): Reference temperature – 25 °C (TREF25) – 20 °C (TREF20) Display of the measured value as S/cm or MΩ...
  • Page 31 LF 11 Operation Display of the TDS UpH mV/pH measured value as % mg/l conductivity / resistivity mbar Baud Time ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCalTEC Using < > < >, switch between S/cm and MΩcm.

  • Page 32: Reset

    Operation handylab LF 11 Reset ϰ Measurement The following measured parameters ( InI) are reset to the default condition: parameters ϰ Measuring mode Cell constant 0.475 cm (calibrated) 0.475 cm (set up) Temperature compensation Reference temperature Temperature coefficient of the lin- 2.000 %/K...

  • Page 33: Maintenance, Cleaning, Disposal

    LF 11 Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The measuring instrument is almost maintenance-free. The only maintenance task is replacing the batteries. LoBat indicates that the batteries should be changed. The batteries are then largely depleted. Replacing the...

  • Page 34: Cleaning

    Maintenance, cleaning, disposal handylab LF 11 Note For the maintenance of the measuring cells, follow the corresponding oper- ating manual. Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lint- free cloth. Disinfect the housing with isopropanol as required.

  • Page 35: What To Do If

    LF 11 What to do if... What to do if... LoBat display Cause Remedy – Batteries almost empty – Replace batteries (see section 5.1 M AINTENANCE Instrument does Cause Remedy not react to key- – Operating condition – Processor reset:...
  • Page 36 What to do if... handylab LF 11 ba75365e04 01/2011...

  • Page 37: Lists

    LF 11 Lists Lists This chapter provides additional information and orientation aids. Abbreviations The list of abbreviations explains the indicators and the abbreviations that ap- pear on the display and in the manual. Specialist terms The glossary briefly explains the meaning of the specialist terms. However, terms that should already be familiar to the target group are not described here.
  • Page 38 Lists handylab LF 11 Abbreviations Conductivity value (international γ) AutoRead (drift control) ARng Automatic range switching Measuring instrument measures with highest reso- lution Cell constant [cm ] (internat. k) °C Temperature unit, degrees Celsius Calibration Initialization Resets individual basic functions to the status they...
  • Page 39 LF 11 Lists Glossary Adjusting To manipulate a measuring system so that the relevant value (e. g. the displayed value) differs as little as possible from the correct value or a value that is regarded as correct, or that the difference remains with- in the tolerance.
  • Page 40 Lists handylab LF 11 Standard solution The standard solution is a solution where the measured value is known by definition. It is used to calibrate a measuring system. Total dissolved solids TDS factor In conductometric measurements, the measuring instrument calcu- lates the total dissolved solids (TDS) from the electric conductivity of the test sample.
  • Page 41 LF 11 Index Index Authorized use Safety AutoRead Safety precautions Salinity Scope of delivery Calibration Calibration evaluation Cell constant determine TDS factor set manually Temperature compensation 26, 29 Conductivity Temperature compensation (conductivity) Temperature sensor Default condition Conductivity Display Total dissolved solids...
  • Page 42 Index handylab LF 11 ba75365e04 01/2011...
  • Page 44 SI Analytics GmbH Postfach 2443 D-55014 Mainz Hattenbergstr. 10 D-55122 Mainz Telefon +49 (0) 61 31/66 5111 Telefax +49 (0) 61 31/66 5001 Email: support@ si-analytics.com Internet: www.si-analytics.com...

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