SCHOTT handylab LF 11 Operating Manual
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SCHOTT handylab LF 11 Operating Manual

Portable conductivity meter
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Operating manual
handylab LF 11
Conductivity measuring instrument
ba75365e01
02/2003

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  • Page 1 Operating manual handylab LF 11 Conductivity measuring instrument ba75365e01 02/2003...
  • Page 2 © Copyright Mainz, Schott-Geräte GmbH, 2002 Reproduction in whole - or even in part - is prohibited without the ex- press written permission of Schott-Geräte GmbH, Mainz. Printed in Germany.

  • Page 3: Table Of Contents

    LF 11 List of contents Overview ........5 Keypad .
  • Page 4 List of contents handylab LF 11...

  • Page 5: Overview

    LF 11 Overview Overview The compact precision handheld meter handylab LF 11 enables you to carry out conductivity measurements rapidly and reliably. The handylab LF 11 provides the maximum degree of operating com- fort, reliability and measuring certainty for all applications.

  • Page 6: Keypad

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

  • Page 7: Display

    Only connect conductivity measuring cells to the measuring instrument that cannot return any voltages or currents that are not allowed (> SELV and > current circuit with current limiting). Nearly all measuring cells - especially SCHOTT measuring cells - fulfill these conditions.

  • 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 structure Type of protection IP 66 Electrical safety Protective class Test certificates GS, cETLus, CE Ambient Storage - 25 °C ... + 65 °C...
  • Page 9 LF 11 Overview Accuracy No compensation: 0.5 % (±1 digit) Specific resistance 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 EEC guideline 89/336/EWG guidelines and norms EN 61326-1:1997 EN 61000-3-2:1995 + pr A14:2000 EN 61000-3-3:1995 FCC Class A...

  • 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 conduc- tivity measuring instrument. Consequently, all responsible personnel must read this operating manual before working with 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 guide- lines 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 l Handheld meter, handylab LF 11 l Operating manual and short operating manual l 4 batteries, 1.5 V Mignon type AA (in the instrument)
  • Page 14 Commissioning handylab LF 11...

  • Page 15: Operation

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

  • Page 16: Measuring

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

  • Page 17: Conductivity / Specific Resistance

    LF 11 Operation 4.2.2 Conductivity / Specific resistance Note You can display measured values in the units µ S/cm (conductivity) or M Ω cm (specific resistance). This setting is described in section 4.4 C ONFIGURATION Thus, you can carry out conductivity measurements or measurements of the specific resistance: 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. S S S S Press the < > key until Sal appears on the status display. The salinity value appears on the display.
  • Page 19 LF 11 Operation Using < > < > , set the TDS factor (0.40 ... 1.00). (The TDS factor has to be determined by a comparison mea- surement before.) Wait for a stable measured value. AutoRead AR The AutoRead function (drift control) checks the stability of the mea- (drift control) surement signal.
  • Page 20 Operation handylab LF 11 Note The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing <RUN/ENTER>.

  • Page 21: Determining/Setting Up The Cell Constant [C]

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

  • Page 22: Determining The Cell Constant (Calibrating In The Control Standard)

    Operation handylab LF 11 4.3.1 Determining the cell constant (calibrating in the control standard) Note This method of automatically determining the cell constant by calibra- tion 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 0.800 ...
  • Page 23 LF 11 Operation 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 24: Setting The Cell Constant Manually

    Operation handylab LF 11 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 25 LF 11 Operation mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref20 Tref25 AutoCal DIN Auto Store LoBat ARng AutoCal TEC S S S S To return to the measuring mode: Press the < > key.
  • Page 26 Operation handylab LF 11 S S S S To return to the measuring mode: Press the < > key. Now this setting is accepted for measuring. Setting the fixed cell You can set the fixed value 0.010 cm for the cell constant as follows: constant 0.010 cm...
  • Page 27 LF 11 Operation mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref20 Tref25 AutoCal DIN Auto Store LoBat ARng AutoCal TEC S S S S To return to the measuring mode: Press the < > key.

  • Page 28: 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 pre- set reference temperature, Tref 20 or Tref 25 (see section 4.4 C ONFIGURATION You can select one of the following temperature compensation meth-...
  • Page 29 LF 11 Operation Selecting the nonlinear You can select the nonlinear temperature compensation as follows: temperature compensa- tion Press the <CAL> key repeatedly until tc appears on the dis- play. mV/pH % mg/l mbar Time Baud ° Day.Month No.
  • Page 30 Operation handylab LF 11 Selecting the linear You can select the linear temperature compensation as follows: temperature compensation Press the <CAL> key repeatedly until tc appears on the dis- play. mV/pH % mg/l mbar Time Baud ° Day.Month No. °...
  • Page 31 LF 11 Operation Switching the tempera- You can switch off the temperature compensation as follows: ture compensation off Press the <CAL> key repeatedly until tc appears on the dis- play. mV/pH % mg/l mbar Time Baud ° Day.Month No.

  • Page 32: Configuration

    Operation handylab LF 11 Configuration You can adapt the measuring instrument to your individual require- ments. 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) S/cm or M Ω...
  • Page 33 LF 11 Operation Display of the TDS UpH mV/pH measured value as % mg/l conductivity / specific resistance mbar Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCalTEC > , switch between S/cm and M Ω cm.

  • Page 34: Reset

    Operation handylab LF 11 Reset Measurement The following measured parameters ( InI) are reset to the default parameters condition: 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 35: 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 batteries Open the housing after the instrument has been switched off: –...

  • Page 36: Cleaning

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

  • Page 37: What To Do If

    LF 11 What to do if... What to do if... Cause Remedy LoBat display – Batteries almost empty – Replace batteries (see section 5.1 M AINTENANCE Instrument does not Cause Remedy react to keystroke – Operating condition – Processor reset: undefined or EMC load Press the <CAL>...
  • Page 38 What to do if... handylab LF 11...

  • Page 39: 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 appear on the display and in the manual. Specialist terms The glossary briefly explains the meaning of the specialist terms. How- ever, terms that should already be familiar to the target group are not described here.
  • Page 40 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 41 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 42 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 43 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 28, 31 Conductivity Temperature compensation (conductivity) Temperature sensor Default condition Conductivity Display Total dissolved solids...
  • Page 44 Index handylab LF 11...

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