Operating manual handylab pH 12 69 24 M CAL PH 92 6 °C TP STO O RCL AR pH Pocket Meter ba75368d04 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 pH 12 List of contents handylab pH 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 Measuring the pH value . . . . . . . . . . . . .
List of contents 4 handylab pH 12 6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
handylab pH 12 Overview 1 Overview The compact precision handheld meter handylab pH 12 enables you to carry out pH measurements rapidly and reliably. The handylab pH 12 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. The proven calibration procedures and the special AutoRead function support you in your work with the handylab pH 12.
Overview handylab pH 12 1.
handylab pH 12 Overview 1.2 Display Status display ISE UpH S 1 8 8 8 8°F Baud Time Day.Month No. Year LoBat 1.3 Sensor symbol mol/L mV/pH % ppm mg/L Ident 8 8 .8 °C % TP AutoCal DIN Auto Store CalError TempError AutoCal TEC ConCal ARng AR Meas. value display Function and temperature display RCL Jack field The meter has either a DIN socket or a BNC socket. The figure shows a meter with DIN socket (1).
Overview handylab pH 12 1.4 Dimensions and weight 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 pH/ORP measuring ranges Precision of pH/ORP (± 1 digit) 8 Technical Data Storage - 25 °C ... + 65 °C Operation -10 °C ... + 55 °C Relative atmospheric humidity < 90 % of annual average Measuring range Resolution pH - 2.000 ...
handylab pH 12 Overview T [°C] Correction function Analog output Serial interface ba75368e04 01/2011 NTC 30: Accuracy ± 0.1 PT 1000: Accuracy ± 0.5 ± 0.1 ±1 Operating temperature 0 °C ... 15 °C 15 °C ... 35 °C 35 °C ... 55 °C Temperature input Manually [°C] - 20 ... + 130 Automatic switchover if a recorder is connected. Output signal Corresponds to the electrode voltage, i.e. 50-62 mV/pH unit Accuracy ± 0.1 % of the measured value ± 4 mV Internal resistance < 5 Ohm (current limited to max.
Overview Power supply Applicable guidelines and norms handylab pH 12 Batteries 4 x 1.5 V alkali-manganese batteries, Type AA Operational life Approx. 5000 operating hours Mains operation 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.
handylab pH 12 Safety 2 Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the pH meter. 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 pH 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 pH 12 Commissioning 3 Commissioning 3.1 Scope of delivery z Handheld meter, handylab pH 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. Setting the date and time ba75368e04 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 pH 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 pH 12 Operation 4 Operation 4.1 Switching on the measuring instrument 1 Press the key. The display test appears briefly on the display. Subsequently, the slope and asymmetry used appear for approx. one second one after the other. In addition, the calibration procedure of the last calibration is shown (AutoCal TEC or AutoCal DIN or no display in the delivery state or following initialization).
Operation handylab pH 12 4.2 Measuring 4.2.1 General information You can measure the following variables: z pH value z ORP voltage Preparatory activities Perform the following preparatory activities when you want to measure: 1 Connect the electrode to the measuring instrument. 2 Adjust the temperature of the buffer solutions or test solutions, or measure the current temperature, if you measure without a temperature sensor.
handylab pH 12 Operation The temperature measurement is absolutely essential for a reproducible pH measurement. If the measurement is made without a temperature sensor, proceed as follows: 1 Measure the current temperature of the test sample using a thermometer. 2 Enter the temperature on the instrument: Set the temperature value of the test sample using <▲ > <▼>. 4.2.2 Measuring the pH value 1 Perform the preparatory activities according to section 4.2.1.
Operation AutoRead (drift control) handylab pH 12 The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values. For identical measurement conditions, the following criteria apply: Reproducibility Response time Better than 0.02 > 30 seconds 1 Call up the pH measuring mode with and <▲> <▼> . 2 Activate the AutoRead function with .
handylab pH 12 Operation 4.2.3 Measuring the ORP voltage In conjunction with an ORP electrode, e.g. BlueLine 31Rx, the measuring instrument can measure the ORP voltage (U) of a solution. 1 Perform the preparatory activities according to section 4.2.1. 2 Immerse the ORP electrode in the test sample. 3 Press the key until U appears on the status display. The ORP voltage (mV) of the test sample appears on the display. 4 Wait for a stable measured value.
Operation handylab pH 12 4.3 Why calibrate? When to calibrate? Calibrating pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry and slope of the electrode and stores them in the measuring instrument. Thus, you should calibrate at regular intervals.
handylab pH 12 Printing the calibration record Operation The calibration protocol contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 42). Note You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.5.3 before calibrating. After a valid calibration, the record is printed. Sample printout: CALIBRATION PROTOCOL 02.03.
Operation Calibration evaluation handylab pH 12 After the calibration, the measuring instrument automatically evaluates the current status of the electrode. The asymmetry and slope are evaluated separately. The worst evaluation appears on the display. Display Asymmetry [mV] Slope [mV/pH] -15 ... +15 -60.5 ... -58 -20 ... +20 -58 ... -57 -25 ... +25 -61 ... -60.5 or -57 ... -56 -30 ... +30 -62 ... -61 or -56 ...
handylab pH 12 Operation 4.3.1 AutoCal TEC For this procedure, use any two or three technical buffer solutions in ascending or descending order (pH values at 25 °C: 2.00 / 4.01 / 7.00 / 10.01). Note The calibration for pH 10.01 is optimized for the SI Analytics technical buffer solution pH 10.01. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the SI Analytics catalog or in the Internet.
Operation handylab pH 12 TDS UpH pH O S Sal mV mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1733 Baud Time Day.Month No. Year Ident 0248 C Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP S 1700 Baud Time Day.Month No. Year Ident 0248 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 5 TDS UpH pH O When the measured value is stable, Ct2 appears.
handylab pH 12 Operation TDS UpH pH O S Sal mV mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1184 Baud Time Day.Month No. Year Ident 0248 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 10 TDS UpH pH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1401 Baud Time Day.Month No. Year Ident 0248 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL When the measured value is stable, AR disappears.
Operation Three-point calibration handylab pH 12 12 Press the key to continue the three-point calibration. Ct3 appears on the display. 13 Thoroughly rinse the electrode with distilled water. 14 If necessary, enter the temperature of the third buffer solution with <▲> <▼>. 15 Immerse the pH electrode in the third buffer solution. 16 Press the key. The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value appears on the display.
handylab pH 12 Operation 4.3.2 AutoCal DIN For this procedure, use two or three different standard buffer solutions according to DIN 19266 in ascending or descending order (type A, C, D or F with pH values at 25 °C of: 1.679 / 4.006 / 6.865 / 9.180). Note The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see section 4.6 CONFIGURATION), the instrument displays the relevant buffer nominal value or the current electrode voltage in mV.
Operation handylab pH 12 TDS UpH pH O S Sal mV mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1177 Baud Time Day.Month No. Year Ident 0248 C S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1401 Baud Time Day.Month No. Year Ident 0248 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 5 TDS UpH pH O When the measured value is stable, Cd2 appears.
handylab pH 12 Operation TDS UpH pH O S Sal mV mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1129 Baud Time Day.Month No. Year Ident 0248 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL TDS UpH pH O S Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP 1918 Baud Time Day.Month No. Year Ident 0248 C Tref25 Tref20 AutoCal DIN Auto Store LoBat nLF Lin Cal AutoCal TEC ARng AR RCL 10 When the measured value is stable, AR disappears.
Operation Three-point calibration handylab pH 12 12 Press the key to continue the three-point calibration. Cd3 appears on the display. 13 Thoroughly rinse the electrode with distilled water. 14 If necessary, enter the temperature of the third buffer solution with <▲> <▼>. 15 Immerse the pH electrode in the third buffer solution. 16 Press the key. The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value appears on the display.
handylab pH 12 Operation 4.3.3 Single-point calibration Two-point calibration ConCal Use any buffer solution for this rapid method. The calibration will be the more exact the nearer the pH value of the buffer solution is to that of the test sample. For this procedure, use two buffer solutions: z pH 7.0 ± 0.5 z any other buffer solution Note Skip the steps 2 and 9 if you use a pH electrode with a temperature sensor.
Operation handylab pH 12 ISE UpH mol/L mV/pH % ppm mg/L S 1 6 S L O°F Baud Time Day.Month No. Year LoBat 32 Ident 8 2 4 8 °C % TP AutoCal DIN Auto Store CalError TempError AutoCal TEC ConCal ARng AR RCL 8 To continue the two-point calibration, thoroughly rinse the electrode with deionized water. 9 If necessary, enter the temperature of the second buffer solution with <▲> <▼>. 10 Immerse the pH electrode in the second buffer solution. 11 Press the key.
handylab pH 12 Operation 15 ba75368e04 01/2011 To return to the measuring mode: Press the key.
Operation handylab pH 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 pH 12 Operation ISE UpH mol/L mV/pH % ppm mg/L S 1 6 9 9 2°F Baud Time Day.Month No. Year LoBat Message StoFull Ident 8 2 4 2 °C % TP AutoCal DIN Auto Store CalError TempError AutoCal TEC ConCal ARng AR RCL 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 pH 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 pH 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 pH measuring mode and starts the measuring and saving process. AutoStore flashes on the display.
Operation handylab pH 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 pH 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 pH 12 Sample printout: Device No.: 12345678 No. 1: 09.03.99 pH 10.01 Tman Ident : 1 No. 2: 09.03.99 pH 10.01 Tauto Ident : 1 17:10 25 °C AR 17:11 24.7 °C AR No. 3: 09.03.99 305 mV Tauto Ident : 13 17:12 ... 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 pH 12 ba75368e04 01/2011 Operation 3 Press to display the value of the asymmetry (mV) in the calibration range I. 4 In two-point calibration: Using or , you can switch back to the pH measuring mode. In three-point calibration: Press to display the slope [mV/pH] in the calibration range II (SLO2). 5 Press to display the value of the asymmetry (mV) in the calibration range II (ASY2).
Operation Outputting the calibration protocol on the interface handylab pH 12 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.
handylab pH 12 Operation 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.
Operation handylab pH 12 4.5 Transmitting data You have the following possibilities of transmitting data: z One of the following options: – With the AutoStore function (page 36), 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).
handylab pH 12 Setting the Data transmission interval Operation 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.
Operation handylab pH 12 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.
handylab pH 12 Operation 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.
Operation handylab pH 12 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 Display during the pH calibration Buffer nominal value, or current electrode voltage Calibration interval (Int 3) 1 ... 7 ... 999 d Date/time Any pH resolution 0.01 or 0.001 Note You can leave the configuration menu at any time with .
handylab pH 12 Operation Display during the pH calibration 6 Select the required display during the pH calibration with <▲> <▼>. mV: Display of the current electrode voltage /pH: Display of the buffer nominal value. 7 Confirm with . Int 3 appears on the display. Calibration interval ISE UpH mol/L mV/pH % ppm mg/L S 1 I n t 3°F Baud Time Day.Month No.
Operation Setting the resolution 50 handylab pH 12 11 Confirm with . The date (month) flashes in the display. 12 Set the current month with <▲> <▼>. 13 Confirm with . The year appears on the display. 14 Set the current year with <▲> <▼>. 15 Confirm with . The hours flash on the display. 16 Set the current time with <▲> <▼>. 17 Confirm with . The minutes flash on the display. 18 Set the current time with <▲> <▼>. 19 Confirm with .
handylab pH 12 Operation 4.7 Reset You can reset (initialize) the measurement parameters and the configuration parameters separately from one another. Measurement parameters The following measured parameters (pH InI) are reset to the default condition: Measuring mode pH Asymmetry 0 mV Slope -59.16 mV/pH Calibration procedures AutoCal TEC Temperature, manual 25 °C Resolution (pH display) 0.
Operation Resetting the measuring parameters handylab pH 12 1 Press the key and hold it down. 2 Press the key. TDS pH O Sal mV/pH % mg/l m S/cm mbarM cm 1/ cmSal °F° % /K TP S 1In I Baud Time Day.Month No. Year Ident 88no 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.
handylab pH 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 pH 12 Note For the maintenance of the electrodes, 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 pH 12 What to do if... 6 Error message 0FL What to do if...
What to do if... handylab pH 12 Buffer solutions No stable measured value – Incorrect buffer solutions – Change calibration procedure – Buffer solutions too old – Use only once.
handylab pH 12 Obviously incorrect measured values What to do if... Cause Remedy pH electrode: – pH electrode unsuitable – Use suitable electrode – Temperature difference between buffer and test sample too high – Adjust temperature of buffers or test samples – Measurement procedure not suitable – Follow special procedure Cause Remedy – Operating condition undefined or EMC load unallowed – Processor reset: Press the and keys at the same time and release them again.
What to do if...
handylab pH 12 Lists 7 Lists This chapter provides additional information and orientation aids. Abbreviations Specialist terms Index ba75368e04 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 pH 12 Abbreviations 60 AR AutoRead (drift control) ARng Automatic range switching Measuring instrument measures with highest resolution ASY Asymmetry AutoCal DIN Automatic pH calibration with buffer solutions prepared according to DIN 19 266 AutoCal TEC Automatic pH calibration with SI Analytics technical buffer solutions according to DIN 19267 °C Temperature unit, degrees Celsius Cal Calibration Cd... Display indicator during calibration for pH measurements.
handylab pH 12 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 within the tolerance. Asymmetry Designation for the offset potential of a pH electrode.
Lists handylab pH 12 Offset potential The measurable potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point. The asymmetry is part of the offset potential. ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in water if these substances become effective on an electrode surface (e. g. a gold or platinum surface). pH value The pH is a measure of the acidic or basic effect of an aqueous solution.
handylab LF 12 Index Index A M Analog output 46 Asymmetry 20 Authorized use 11 AutoCal DIN 20, 27 AutoCal TEC 20, 23 AutoRead 17 Measuring ranges pH/ORP 8 C Calibration evaluation 22 Calibration procedures 20 Calibration protocol 21 ConCal 20, 31 Connecting a printer 47 Connecting the plug-in power supply 14 D Data record 34 Data transmission (interval) O Operating safety 12 ORP electrode 19 ORP voltage 19 P Printing calibration protocol 21 R Remote control 47 Replacing the batteries 53 Reset 51
Index 64 handylab LF 12 ba75368e04 01/2011
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