SCHOTT handylab pH 12 Operating Manual

Ph measuring instrument

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Operating manual

handylab pH 12

pH measuring instrument

ba75368e01

01/2003

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Page 1 Operating manual handylab pH 12 pH measuring instrument ba75368e01 01/2003...
Page 3: Table Of Contents
12 List of contents Overview ........5 Keypad .
Page 4 List of contents handylab pH 12 Lists ........59...
Page 5: Overview
12 Overview 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 com- fort, reliability and measuring certainty for all applications.
Page 6: Keypad
Overview handylab pH 12 Keypad RUN/ENTER Key functions Select the measuring mode <pH>: – pH value – ORP voltage Save a measured value <STO> Switch measuring instrument on/off <ON/OFF> Calibration of the current measured variable <CAL> Display/transmit measured values <RCL>...
Page 7: Display
Caution Only connect electrodes to the measuring instrument that cannot return any voltages or currents that are not allowed (> SELV and > current circuit with current limiting). Nearly all electrodes - especially SCHOTT electrodes - fulfill these con- ditions.
Page 8: Technical Data
Overview handylab pH 12 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 12 Overview Correction function Temperature input Manually [°C] - 20 ... + 130 Analog output 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 <...
Page 10 Overview handylab pH 12 Power supply Batteries 4 x 1.5 V alkali-manganese batteries, Type Operational life Approx. 5000 operating hours Mains operation The following specifications apply to all plug- in power supplies: Max. overvoltage connection category II Plug-in power supply with Euro plug: FRIWO FW1199, 11.7864...
Page 11: Safety
12 Safety 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 man- ual 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 pH 12 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
12 Commissioning Commissioning Scope of delivery l Handheld meter, handylab pH 12 l Operating manual and short operating manual l 4 batteries, 1.5 V Mignon type AA (in the instrument) Initial commissioning Perform the following activities: l Set the date and time l Connect the plug-in power supply.
Page 14 R e f Plug the jack (1) into the socket (2) of the measuring instru- ment. Connect the original SCHOTT plug-in power supply (3) to an easily accessible mains socket. Note You can also measure without the plug-in power supply.
Page 15: Operation
12 Operation Operation Switching on the measuring instrument Press the <ON/OFF> key. The display test appears briefly on the display. Subsequently, the slope and asymmetry used appear for ap- prox. one second one after the other. In addition, the calibration...
Page 16: Measuring
Operation handylab pH 12 Measuring 4.2.1 General information You can measure the following variables: l pH value l ORP voltage Preparatory activities Perform the following preparatory activities when you want to measure: Connect the electrode to the measuring instrument. Adjust the temperature of the buffer solutions or test solutions, or measure the current temperature, if you measure without a temperature sensor.
Page 17: Measuring The Ph Value
12 Operation The temperature measurement is absolutely essential for a reproduc- ible pH measurement. If the measurement is made without a tempera- ture sensor, proceed as follows: Measure the current temperature of the test sample using a thermometer.
Page 18 Operation handylab pH 12 AutoRead The AutoRead function (drift control) checks the stability of the mea- (drift control) surement signal. The stability has a considerable impact on the repro- ducibility of the measured values. For identical measurement conditions, the following criteria apply:...
Page 19: Measuring The Orp Voltage
12 Operation 4.2.3 Measuring the ORP voltage In conjunction with an ORP electrode, e.g. BlueLine 31Rx, the measur- ing instrument can measure the ORP voltage (U) of a solution. Perform the preparatory activities according to section 4.2.1. Immerse the ORP electrode in the test sample.
Page 20: Calibrating
ONFIGURATION You can select between 3 calibration procedures: AutoCal TEC is specially adapted to the SCHOTT technical buffer solutions as a fully automatic two-point or three-point calibration. The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see section 4.6 C...
Page 21 12 Operation AutoRead When calibrating with AutoCal TEC and AutoCal DIN, the AutoRead function is automatically activated. The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing <RUN/ENTER>. Displaying calibration Each time the instrument is switched on, the calibration data are shown data on the display for a short time (see section 4.1 S...
Page 22 Operation handylab pH 12 Calibration evaluation After the calibration, the measuring instrument automatically evaluates the current status of the electrode. The asymmetry and slope are eval- uated separately. The worst evaluation appears on the display. Display Asymmetry Slope [mV] [mV/pH] -15 ...
Page 23: Autocal Tec
(pH values at 25 °C: 2.00 / 4.01 / 7.00 / 10.01). Note The calibration for pH 10.01 is optimized for the SCHOTT technical buffer solution pH 10.01. Other buffer solutions can lead to an errone- ous calibration. The correct buffer solutions are given in the SCHOTT catalog or in the Internet.
Page 24 Operation handylab pH 12 mV/pH mV/pH mg/l mg/l mbar mbar 1/ cm Time Baud Time Baud ° ° Day.Month No. Day.Month No. ° ° Year Ident Year Ident Tref20 AutoCal DIN Auto Store Tref20 AutoCal DIN Auto Store Tref25 Tref25...
Page 25 12 Operation mV/pH mV/pH mg/l mg/l mbar mbar 1/ cm Time Baud Time Baud ° ° Day.Month No. Day.Month No. ° ° Year Ident Year Ident Tref20 AutoCal DIN Auto Store Tref20 AutoCal DIN Auto Store Tref25 Tref25...
Page 26 Operation handylab pH 12 Three-point calibration Press the <RUN/ENTER> key to continue the three-point calibration. Ct3 appears on the display. Thoroughly rinse the electrode with distilled water. If necessary, enter the temperature of the third buffer solution with < > <...
Page 27: Autocal Din
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).
Page 28 Operation handylab pH 12 mV/pH mV/pH mg/l mg/l mbar mbar 1/ cm Time Baud Time Baud ° ° Day.Month No. Day.Month No. ° ° Year Year Ident Ident Tref20 Auto Tref20 Auto Tref25 AutoCal DIN Store Tref25 AutoCal DIN Store...
Page 29 12 Operation mV/pH mV/pH mg/l mg/l mbar mbar 1/ cm Time Baud Time Baud ° ° Day.Month No. Day.Month No. ° ° Year Ident Year Ident Tref25 Tref20 AutoCal DIN Auto Store Tref25 Tref20 AutoCal DIN Auto Store...
Page 30 Operation handylab pH 12 Three-point calibration Press the <RUN/ENTER> key to continue the three-point calibration. Cd3 appears on the display. Thoroughly rinse the electrode with distilled water. If necessary, enter the temperature of the third buffer solution with < > <...
Page 31: Concal
12 Operation 4.3.3 ConCal Single-point calibration 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. Two-point calibration For this procedure, use two buffer solutions: l pH 7.0 ±...
Page 32 Operation handylab pH 12 Note At this point, the ConCal calibration can be broken off with <pH>. This corresponds to a single-point calibration. For this, the instrument uses the Nernst slope (-59.2 mV/pH at 25 °C) and the specified asym- metry of the electrode.
Page 33 12 Operation Press the <RUN/ENTER> key. The value of the asymmetry (mV) appears on the display. To return to the measuring mode: Press the <pH> key.
Page 34: Saving
Operation handylab pH 12 Saving The measuring instrument has an internal data memory. It can store up to 800 data records. A complete data record consists of: l Storage location l Date/time l Measured value l Temperature l Temperature measuring procedure...
Page 35 12 Operation mol/L mV/pH % ppm mg/L °F Time Baud Day.Month °C Year Ident CalError TempError AutoCal DIN Auto Store LoBat ARng AR AutoCal TEC ConCal Using < > < > , enter the required ID number (1 ... 999).
Page 36: Saving Automatically
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 transmit- ted to the storage and to the interface.
Page 37 12 Operation As soon as all of the 800 storage locations are occupied, AutoStore is terminated (Int 1 = OFF). If there are not enough storage locations available for your measurements: – Output and backup the data storage (see page 38) and –...
Page 38: Outputting The Data Storage
Operation handylab pH 12 4.4.3 Outputting the data storage You can output the contents of the data storage: l Stored data on the display l Calibration data on the display l Stored data on the serial interface l Calibration protocol to the interface Outputting stored data Press the <RCL>...
Page 39 12 Operation Note If you want to search for a certain element (e.g. date), proceed as fol- lows: Using <RUN/ENTER>, select the element (e.g. date). Press < > or < > repeatedly until the required date appears on the display.
Page 40 Operation handylab pH 12 Sample printout: Device No.: 12345678 09.03.99 17:10 pH 10.01 °C Tman Ident : 09.03.99 17:11 pH 10.01 24.7 °C Tauto Ident : 09.03.99 17:12 305 mV Tauto Ident : Outputting the Press the <RCL> key repeatedly until CAL dISP appears on calibration data the display.
Page 41 12 Operation Press <RUN/ENTER> to display the value of the asymmetry (mV) in the calibration range I. In two-point calibration: Using <pH> or <RUN/ENTER>, you can switch back to the pH measuring mode. In three-point calibration: Press <RUN/ENTER> to display the slope [mV/pH] in the cali- bration range II (SLO2).
Page 42 Operation handylab pH 12 Outputting the calibra- Press the <RCL> key repeatedly until CAL appears on the dis- tion protocol on the play. interface mol/L mV/pH % ppm mg/L °F Time Baud Day.Month °C Year Ident CalError TempError AutoCal DIN...
Page 43: Clearing The Memory
12 Operation 4.4.4 Clearing the memory With this function, you can delete stored data records. 800 storage lo- cations 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 automati- cally switches to the measuring mode.
Page 44: Transmitting Data
Operation handylab pH 12 Transmitting data You have the following possibilities of transmitting data: l 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.
Page 45 12 Operation Setting the The default setting for the interval is OFF. Data transmission To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, interval 5 min, 10 min, 15 min, 30 min, 60 min): Press the <RUN/ENTER>...
Page 46: Recorder (Analog Output)
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.
Page 47: Pc/External Printer (Rs232 Interface)
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 ex- ternal printer. Use the Z 395 (PC) or Z 391 (ext. printer) cable to connect the interface to the instruments.
Page 48: Configuration
Operation handylab pH 12 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): Baud rate 1200, 2400, 4800, 9600 Display during the...
Page 49 12 Operation Display during the pH calibration Select the required display during the pH calibration with < > < > . mV: Display of the current electrode voltage /pH: Display of the buffer nominal value. Confirm with <RUN/ENTER>. Int 3 appears on the display.
Page 50 Operation handylab pH 12 Set the date of the current day with < > < > . Confirm with <RUN/ENTER>. The date (month) flashes in the display. Set the current month with < > < > . Confirm with <RUN/ENTER>.
Page 51: Reset
12 Operation Reset You can reset (initialize) the measurement parameters and the config- uration parameters separately from one another. Measurement The following measured parameters (pH InI) are reset to the default parameters condition: Measuring mode Asymmetry 0 mV Slope -59.16 mV/pH...
Page 52 Operation handylab pH 12 Resetting the Press the <RUN/ENTER> key and hold it down. measuring parameters Press the <CAL> key. mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Using <...
Page 53: Maintenance, Cleaning, Disposal
12 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 54: Cleaning
Maintenance, cleaning, disposal handylab pH 12 Note For the maintenance of the electrodes, 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 re- quired.
Page 55: What To Do If
12 What to do if... What to do if... Error message 0FL Cause Remedy pH electrode: – Not connected – Connect electrode – Air bubble in front of the – Remove air bubble diaphragm – Air in the diaphragm –...
Page 56 What to do if... handylab pH 12 Buffer solutions – Incorrect buffer solutions – Change calibration procedure – Buffer solutions too old – Use only once. Note the shelf life – Buffer solutions depleted – Change solutions No stable measured...
Page 57 12 What to do if... Obviously incorrect Cause Remedy measured values pH electrode: – pH electrode unsuitable – Use suitable electrode – Temperature difference – Adjust temperature of buffers between buffer and test or test samples sample too high –...
Page 58 What to do if... handylab pH 12...
Page 59 12 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 60 Conventional single-point or two-point calibration for pH measurements Ct... Display indicator during calibration for pH mea- surements. Indicates the selection of the buffer data records for SCHOTT technical buffer solu- tions Initialization Resets individual basic functions to the status they had on delivery...
Page 61 12 Lists Temperature measurement active (Temperature Probe) Asymmetry...
Page 62 Lists handylab pH 12 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 63 12 Lists 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...
Page 64 Lists handylab pH 12...
Page 65 12 Index Index Analog output Measuring ranges Asymmetry pH/ORP Authorized use 20, 27 AutoCal DIN 20, 23 AutoCal TEC Operating safety AutoRead ORP electrode ORP voltage Calibration evaluation Calibration procedures Printing Calibration protocol calibration protocol 20, 31 ConCal...
Page 66 Index handylab pH 12...

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