Operating manual handylab LF 11 Tref2 nLF 5 53 25 M 0 0 S/cm °C TP AR CAL O AR Conductivity Meter ba75365d04 01/2011
handylab LF 11 Accuracy when going to press Warranty The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.
handylab LF 11 List of contents handylab LF 11 - List of contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 1.2 1.3 1.4 2 4.3 4.4 4.5 01/2011 Switching on the measuring instrument . . . . . . . . . . . . . . . . . Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 Conductivity / Resistivity . . . . . . . . . . . . . . . .
List of contents 4 handylab LF 11 ba75365e04 01/2011
handylab LF 11 Overview 1 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 comfort, reliability and measuring certainty for all applications. The proven procedure for adjusting or setting the cell constant and the special AutoRead function support you in your work with the handylab LF 11.
Overview handylab LF 11 1.
handylab LF 11 Overview 1.2 Display Status display TDS UpH O S Sal mV/pH % mg/l mS/cm mbarM cm 1/ cmSal °F° % /K TP 1888 Baud Time Day.Month No. Year Ident 8 8 .8 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 1.3 Sensor symbol Meas.
Overview handylab LF 11 1.4 Dimensions and weight Technical Data Length [mm] 172 Width [mm] 80 Height [mm] 37 Weight [kg] Approx. 0.3 Type of protection IP 66 Electrical safety Protective class III Test certificates cETLus, CE Mechanical structure Ambient conditions Measuring ranges Storage - 25 °C ... + 65 °C Operation -10 °C ... + 55 °C Relative atmospheric humidity < 90 % of annual average ϰ [µS/cm] ϰ [mS/cm] 8 0.000 ... 1.999 (only for cell constant = 0.010 cm-1) 0.00 ...
handylab LF 11 Accuracy (±1 digit) Overview ϰ, Resistivity No compensation: 0.5 % 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 Linear compensation Accuracy Sample temperature ± 0.5 % 10 °C ... 75 °C (The accuracy percentage always refers to the measured value.) SAL Range 0.0 ... 42.0 Accuracy Sample temperature ± 0.1 5 °C ... 25 °C ± 0.2 25 °C ... 30 °C TDS [mg/l] 1 T [°C] NTC 30: Accuracy ± 0.
Overview Power supply Applicable guidelines and norms handylab LF 11 Batteries 4 x 1.5 V alkali-manganese batteries, Type AA Operational life Approx. 2500 operating hours (depending on conductivity) EMC EC guideline 2004/108/EC EN 61326-1 EN 61000-3-2 EN 61000-3-3 FCC Class A Instrument safety EC guideline 2006/95/EC EN 61010-1 ANSI/UL 61010-1 CAN/CSA-C22.2 No.
handylab LF 11 Safety 2 Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the conductivity measuring instrument. Consequently, all responsible personnel must read this operating manual before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system. Target group The measuring instrument was developed for work in the field and in the laboratory.
Safety handylab LF 11 2.2 General safety instructions This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see section 1.4 TECHNICAL DATA). It left the factory in a safe and secure technical condition.
handylab LF 11 Commissioning 3 Commissioning 3.1 Scope of delivery z Handheld meter, handylab LF 11 z Operating manual and short operating manual z 4 batteries, 1.
Commissioning 14 handylab LF 11 ba75365e04 01/2011
handylab LF 11 Operation 4 Operation 4.1 Switching on the measuring instrument 1 Connect a conductivity measuring cell to the measuring instrument. 2 Press the 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. one second one after the other. The measuring instrument then automatically switches to the measuring mode that was last selected.
Operation Preparatory activities Temperature sensor handylab LF 11 4.2 Measuring 4.2.1 General information Perform the following preparatory activities when you want to measure: 1 Connect the conductivity measuring cell to the measuring instrument. 2 In conjunction with the measuring cell, check or calibrate the measuring instument. How to calibrate is described in section 4.3. 3 Select the measuring mode with . Only carry out measurements with a temperature sensor.
handylab 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 CONFIGURATION. Thus, you can carry out conductivity measurements or measurements of the resistivity: 1 Perform the preparatory activities according to section 4.2.1. 2 Immerse the conductivity measuring cell in the test sample. 3 Conductivity μS/cm Press the key until ϰ appears on the status display.
Operation handylab LF 11 4.2.3 Salinity You can measure the salinity as follows: 1 Perform the preparatory activities according to section 4.2.1. 2 Immerse the conductivity measuring cell in the test sample. 3 Press the key until Sal appears on the status display. The salinity value appears on the display. TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1323 Baud Time Day.Month No.
handylab LF 11 Operation 5 AutoRead AR (drift control) Wait for a stable measured value. The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value. 1 Select the required measuring mode with . 2 Activate the AutoRead function with . The current measured value is frozen (hold function). 3 Start AutoRead with . AR flashes until a stable measured value is reached.
Operation handylab LF 11 4.3 Why determine/set up the cell constant? Procedure Determining/setting up the cell constant [C] Aging slightly changes the characteristics of the cell, e. g. by coatings. As a result, an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell. Calibration determines the current cell constant and stores it in the instrument. Thus, you should calibrate at regular intervals (we recommend: every 6 months).
handylab 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-1 or 0.800 ... 1.200 cm-1. This is how you can determine the cell constant: 1 Press the key until CELL appears on the display. TDS UpH O S 18L F Baud Time Day.Month No.
Operation handylab LF 11 6 Press the key. – If no temperature sensor is connected, enter the current temperature of the solution with and confirm with . – If a temperature sensor is connected, the AR measurement to determine the cell constant starts. The AR display indicator flashes until a stable signal is reached. The cell constant determined is displayed. The measuring instrument automatically stores the cell constant. TDS UpH O S 1C AL Baud Time Day.Month No.
handylab 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 0.250 ... 2.500 cm-1 1 Press the key repeatedly until CELL appears on the display. TDS UpH O S 18L F Baud Time Day.Month No.
Operation Range 0.090 ... 0.110 cm-1 handylab LF 11 5 To return to the measuring mode: Press the key. From now on, the cell constant 0.614 cm-1 will be used. 1 Press the key repeatedly until CELL appears on the display. TDS UpH O S 18L F Baud Time Day.Month No. Year Ident Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP CELL C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 2 Press the key.
handylab LF 11 Setting the fixed cell constant 0.010 cm-1 Operation You can set the fixed value 0.010 cm-1 for the cell constant as follows: 1 Press the key repeatedly until CELL appears on the display. TDS UpH O S 18L F Baud Time Day.Month No. Year Ident Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP CELL C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 2 Press the key. 3 Press the key repeatedly until the cell constant 0.
Operation handylab LF 11 4.3.3 Setting the temperature compensation TC The calculation of the temperature compensation is based on the preset reference temperature, Tref 20 or Tref 25 (see section 4.4 CONFIGURATION). You can select one of the following temperature compensation methods: z Nonlinear temperature compensation (nLF) according to EN 27 888 z Linear temperature compensation (Lin) with selectable coefficients of 0.001 ... 3.
handylab LF 11 Selecting the nonlinear temperature compensation Operation You can select the nonlinear temperature compensation as follows: 1 Press the key repeatedly until tc appears on the display. TDS UpH O S 18L F Baud Time Day.Month No. Year Ident Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP CEtc C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 2 Press the key. 3 Press the key repeatedly until nLF appears on the display.
Operation Selecting the linear temperature compensation handylab LF 11 You can select the linear temperature compensation as follows: 1 Press the key repeatedly until tc appears on the display. TDS UpH O S 18L F Baud Time Day.Month No. Year Ident Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP CEtc C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 2 Press the key.
handylab LF 11 Switching the temperature compensation off Operation You can switch off the temperature compensation as follows: 1 Press the key repeatedly until tc appears on the display. TDS UpH O S 18L F Baud Time Day.Month No. Year Ident Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP CEtc C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 2 Press the key. 3 Press the key repeatedly until the following display appears.
Operation handylab LF 11 4.4 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 conductivity or resistivity S/cm or MΩ Note You can leave the configuration menu at any time with . The parameters that have already been changed are stored.
handylab LF 11 Display of the measured value as conductivity / resistivity Operation TDS UpH O S 1t 25 Baud Time Day.Month No. Year Ident C ond Tref25 Tref20 LoBat nLF Lin Cal ba75365e04 01/2011 Sal mV/pH % mg/l m S/cm mbar M cm 1/ cm Sal °F° % /K TP AutoCal DIN AutoCalTEC C Auto Store ARng AR RCL 6 Using , switch between S/cm and MΩcm. 7 Confirm with . The measuring instrument automatically switches to the measuring mode.
Operation handylab LF 11 4.5 Measurement parameters Reset The following measured parameters (ϰ InI) are reset to the default condition: Measuring mode ϰ Cell constant 0.475 cm-1 (calibrated) 0.475 cm-1 (set up) Temperature compensation nLF Reference temperature Temperature coefficient of the linear temperature compensation 2.000 %/K TDS factor 1.00 Note The calibration data gets lost when the measuring parameters are reset. Recalibrate after performing a reset.
handylab LF 11 Maintenance, cleaning, disposal 5 Maintenance, cleaning, disposal 5.1 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 2 1 1 Open the housing after the instrument has been switched off: – Undo the four screws on the underside of the instrument – Pull down the lower cover (1).
Maintenance, cleaning, disposal handylab LF 11 Note For the maintenance of the measuring cells, follow the corresponding operating manual. 5.2 Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lintfree cloth. Disinfect the housing with isopropanol as required. Caution The housing is made of a synthetic material (ABS). Thus, avoid contact with acetone and similar detergents that contain solvents. Remove any splashes immediately. 5.
handylab LF 11 What to do if... 6 LoBat display Instrument does not react to keystroke Error message OFL What to do if... Cause Remedy – Batteries almost empty – Replace batteries (see section 5.1 MAINTENANCE) Cause Remedy – Operating condition undefined or EMC load unallowed – Processor reset: Press the and keys at the same time and release them again. The software version is displayed.
What to do if...
handylab LF 11 Lists 7 Lists This chapter provides additional information and orientation aids. Abbreviations Specialist terms Index ba75365e04 01/2011 The list of abbreviations explains the indicators and the abbreviations that appear on the display and in the manual. 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. The index will help you to find the topics that you are looking for.
Lists handylab LF 11 Abbreviations Conductivity value (international γ) 38 AR AutoRead (drift control) ARng Automatic range switching Measuring instrument measures with highest resolution C Cell constant [cm-1] (internat.
handylab LF 11 Lists Glossary Adjusting AutoRange AutoRead 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 within the tolerance. Name of the automatic selection of the measuring range. Name for a function to check the stability of the measured value. Calibration Comparing the value from a measuring system (e. g.
Lists handylab LF 11 Standard solution TDS TDS factor Temperature coefficient 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 In conductometric measurements, the measuring instrument calculates the total dissolved solids (TDS) from the electric conductivity of the test sample. For the calculation, a simple multiplication factor between 0.4 and 1.0 suffices.
handylab LF 11 Index Index A S Authorized use 11 AutoRead 19 Safety 11 Safety precautions 11 Salinity 18 Scope of delivery 13 C Calibration 20 Calibration evaluation 20 Cell constant 20 determine 21 set manually 23 Conductivity 17 D Default condition 32 Display 7 Drift control 19 T TDS 18 TDS factor 18 Temperature compensation 26, 29 Temperature compensation (conductivity) 16 Temperature sensor Conductivity 16 Total dissolved solids 18 E Energy saving feature 15 Error messages 35 K Keys 6 L Lin
Index 42 handylab LF 11 ba75365e04 01/2011
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