Operating manual handylab LF 12 Tref2 nLF 5 53 25 M CAL 0 0 S/cm °C TP AR STO O RCL AR Conductivity Meter ba75367d04 01/2011
handylab LF 12 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 12 List of contents handylab LF 12 - List of contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 1.2 1.3 1.4 2 4.3 4.4 4.5 4.6 4.7 01/2011 Switching on the measuring instrument . . . . . . . . . . . . . . . . . Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 Conductivity / Resistivity . . . . . . . . . . .
List of contents 4 handylab LF 12 6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
handylab LF 12 Overview 1 Overview The compact precision handheld meter handylab LF 12 enables you to carry out conductivity measurements rapidly and reliably. The handylab LF 12 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 12.
Overview handylab LF 12 1.
handylab LF 12 Overview 1.2 Display Status display TDS UpH O S Sal mV/pH % mg/l mS/cm mbar M cm 1/ cm Sal °F° % /K TP Sensor symbol 1888 Baud Time Day.Month No. Year Ident 8 8 .8 Tref25 Tref20 LoBat nLF Lin Cal 1.3 AutoCal DIN AutoCalTEC Meas.
Overview handylab LF 12 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 12 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 Analog output Serial interface 10 handylab LF 12 Automatic switchover when a recorder is connected. Output signal 0 ... 1.999 V for range 0 ... 1999 digits Accuracy ± 0.5 % of display value Internal resistance < 5 Ohm (curr ent limited to max. 0.2 mA output current) Automatic switchover when a PC or printer is connected.
handylab LF 12 Power supply Applicable guidelines and norms Overview Batteries 4 x 1.5 V alkali-manganese batteries, Type AA Operational life Approx. 2500 operating hours (depending on conductivity) Mains FRIWO FW7555M/09, 15.1432.500-00 Friwo Part. No. 1883259 Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA Output: 9 V = / 1.5 A Connection max. overvoltage category II Primary plugs contained in the scope of delivery: Euro, US, UK and Australian.
Overview 12 handylab LF 12 ba75367e04 01/2011
handylab LF 12 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 12 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 12 Commissioning 3 Commissioning 3.1 Scope of delivery z Handheld meter, handylab LF 12 z Operating manual and short operating manual z 4 batteries, 1.5 V Mignon type AA (in the instrument) 3.2 Initial commissioning Perform the following activities: z Set the date and time z Connect the plug-in power supply, optional. Setting the date and time ba75367e04 01/2011 1 Press the key and hold it down. 2 Press the key. The display test appears briefly on the display.
Commissioning Connecting the plug-in power supply (option) handylab LF 12 You can either operate the measuring instrument with batteries or with the plug-in power supply. The plug-in power supply supplies the measuring instrument with low voltage (12 V DC). This saves the batteries. Caution The line voltage at the operating site must lie within the input voltage range of the original plug-in power supply (see section 1.4 TECHNICAL DATA). Caution Use original plug-in power supplies only (see section 1.
handylab LF 12 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 handylab LF 12 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 .
handylab LF 12 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 4.6 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 12 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 12 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 12 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 12 Operation Cell constant [cm-1] Display 0.450 ... 0.500 cm-1 0.800 ... 1.200 cm-1 E3 Eliminate the error according to chapter 6 WHAT TO DO IF... 4.3.1 outside the ranges 0.450 ... 0.500 cm-1 or 0.800 ... 1.200 cm-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.
Operation handylab LF 12 TDS UpH O S 1C AL Baud Time Day.Month No. Year Ident Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 0475 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 4 The displayed value is the current, calibrated cell constant. You can: – accept this setting for measuring with or – continue with step 5 and start a new calibration. 5 Immerse the measuring cell in the control standard solution, 0.01 mol/KCl. 6 Press the key.
handylab LF 12 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 12 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 12 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 12 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 4.6 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 12 Selecting the noninear temperature comensation 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 linar temperature compensation handylab LF 12 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 12 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 12 4.4 Saving The measuring instrument has an internal data memory. It can store up to 800 data records. A complete data record consists of: z Storage location z Date/time z Measured value z Temperature z Temperature measuring procedure z ID number You can transmit measured values (data records) to the data storage in two ways: z Save manually z Switch on AutoStore (Int 1). 4.4.
handylab LF 12 Operation TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 155 3 Baud Time Day.Month No. Year Ident 0011 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL Message StoFull 3 Using , enter the required ID number (1 ... 999). 4 Confirm with . The instrument changes to the measuring mode. This message appears when all of the 800 storage locations are occupied.
Operation handylab LF 12 4.4.2 Saving automatically The save interval (Int 1) determines the chronological interval between automatic save processes. After the fixed interval has expired, the current data record is transmitted to the storage and to the interface. Setting the save interval The default setting for the save interval (Int 1) is OFF. By this, the AutoStore function is switched off.
handylab LF 12 Operation 6 Confirm with . The prompt for the ID number appears on the display. TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1999 Baud Time Day.Month No. Year Ident Fr e1 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 7 Set the required ID number with . 8 Confirm with . The instrument switches to the measuring mode and starts the measuring and saving process. AutoStore flashes on the display.
Operation handylab LF 12 4.4.3 Outputting the data storage You can output the contents of the data storage: z Stored data on the display z Calibration data on the display z Stored data on the serial interface z Calibration protocol to the interface Outputting stored data on the display 1 Press the key repeatedly until StO dISP appears on the display. TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1ST O Baud Time Day.Month No.
handylab LF 12 Operation Note If you want to search for a certain element (e.g. date), proceed as follows: Outputting stored data to the interface 1 Using , select the element (e.g. date). 2 Press or repeatedly until the required date appears on the display. After approx. 2 s the temperature of the displayed measured value appears. 1 Press the key repeatedly until Sto SEr appears on the display.
Operation handylab LF 12 Sample printout: Device No.: 99990000 No. 1: 01.01.99 00:04 2.40 mS/cm 25 °C Tman nLF Tref25 C = 0.475 1/cm Ident : 1 No. 2: 10.01.99 10:09 2.40 mS/cm 25.3 °C Tauto nLF Tref25 C = 0.475 1/cm Ident : 1 No. 3: 12.01.99 01:48 2.40 mS/cm 21.6 °C Tauto nLF Tref25 C = 0.475 1/cm Ident : 1 ... Outputting the calibration data on the display 1 Press the key repeatedly until CAL dISP appears on the display. ISE UpH mol/L mV/pH % ppm mg/L S 1 0 C A L°F Baud Time Day.Month No.
handylab LF 12 Outputting the calibration protocol on the interface Operation 3 Using or , you can switch back to the measuring mode. 1 Press the key repeatedly until CAL appears on the display. ISE UpH mol/L mV/pH % ppm mg/L S 1 0 C A L°F Baud Time Day.Month No. Year LoBat 2 Ident d s e r °C % TP AutoCal DIN Auto Store CalError TempError AutoCal TEC ConCal ARng AR RCL Press the key. The calibration protocol is transmitted to the interface.
Operation handylab LF 12 4.4.4 Clearing the memory With this function, you can delete stored data records. 800 storage locations will then be available again. Note The Clear memory function only appears when there are data records stored in the memory. Otherwise, the measuring instrument automatically switches to the measuring mode. Proceed as follows to clear all data records: 1 Switch off the measuring instrument. 2 Press the key and hold it down. 3 Press the key.
handylab LF 12 Operation 4.5 Transmitting data You have the following possibilities of transmitting data: z One of the following options: – With the AutoStore function (page 34), measured values are periodically saved internally (save interval Int 1) and output on the interface. – With the Data transmission interval function (Int 2), measured values are periodically output on the interface (see below).
Operation Setting the Data transmission interval handylab LF 12 The default setting for the interval is OFF. To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min): 1 Press the key and hold it down. 2 Press the key. Int 2 appears on the display. TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1nt 2 Baud Time Day.Month No.
handylab LF 12 Operation 4.5.2 Recorder (analog output) You can transmit data to a recorder via the analog output. Connect the analog output to the recorder via the Z 394 interface cable. The data output automatically switches to Recorder output. Socket assignment 1 4 2 3 RS 232 REC 1 free 2 Plug coding 3 Ground 4 Analog output (internal resistance < 5 Ohm) Note The analog output is activated automatically in the cable by connecting 2 and 3.
Operation handylab LF 12 4.5.3 PC/external printer (RS232 interface) Via the RS 232 interface, you can transmit the data to a PC or an external printer. Use the Z 395 (PC) or Z 391 (ext. printer) cable to connect the interface to the instruments. The data output automatically switches to the RS232 interface. Caution The RS232 interface is not galvanically isolated. When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
handylab LF 12 Operation 4.6 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): Baud rate 1200, 2400, 4800, 9600 Calibration interval (Int 3) 1 ... 180 ...
Operation handylab LF 12 Calibration interval TDS UpH O Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP S 1nt 3 Baud Time Day.Month No. Year Ident d180 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL AutoRange (automatic selection of the measurement range) 6 Set the required interval in days with . 7 Confirm with . Arn appears on the display. TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1Ar n Baud Time Day.
handylab LF 12 Display of the measured value as conductivity / resistivity Operation TDS UpH O S Sal mV/pH % mg/l m S/cm mbar M cm 1/ cm Sal °F° % /K TP 1t 25 Baud Time Day.Month No. Year Ident C ond Tref25 Tref20 LoBat nLF Lin Cal C Auto Store ARng AR RCL AutoCal DIN AutoCalTEC 12 Using , switch between S/cm and MΩcm. 13 Confirm with . The date flashes on the display. Date and time TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1Dis Baud Time Day.
Operation handylab LF 12 4.7 Reset You can reset (initialize) the measurement parameters and the configuration parameters separately from one another. Measurement parameters 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.
handylab LF 12 Resetting the measuring paramters Operation 1 Press the key and hold it down. 2 Press the key. TDS UpH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1In I Baud Time Day.Month No. Year Ident 4Yno C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL Resetting the configuration parameters 3 Using , switch between no and YES. YES: Resetting the measuring parameters no: Retaining settings.
Operation 50 handylab LF 12 ba75367e04 01/2011
handylab LF 12 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 12 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 12 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 12 Lists 7 Lists This chapter provides additional information and orientation aids. Abbreviations Specialist terms Index ba75367e04 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 12 Abbreviations Conductivity value (international γ) 56 AR AutoRead (drift control) ARng Automatic range switching Measuring instrument measures with highest resolution C Cell constant [cm-1] (internat.
handylab LF 12 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 12 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 12 Index Index A LoBat 53 Analog output 43 Authorized use 13 AutoRead 21 N C Calibration 22 Calibration evaluation 22 Calibration protocol 22 Cell constant 22 determine 23 set manually 25 Conductivity 19 Conductivity/ Resistance 43 Connecting a printer 44 Connecting the plug-in power supply 16 D Data record 32 Data transmission (interval) 42 Default condition 48 Display 7 Drift control 21 E Energy saving feature 17 Error messages 53 I Initial commissioning 15 Initialization 48 Interva
Index 60 handylab LF 12 ba75367e04 01/2011
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