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wtw pH 1970i Operating Manual

Portable ph measuring instrument
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Operating manual
pH 1970i
Portable pH measuring instrument
ba75690e01
01/2007

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  • Page 1 Operating manual pH 1970i Portable pH measuring instrument ba75690e01 01/2007...
  • Page 2 © Copyright Weilheim 2007, WTW GmbH Reproduction in whole - or even in part - is prohibited without the ex- press written permission of WTW GmbH, Weilheim. Printed in Germany. ba75690e01 01/2007...

  • Page 3: Table Of Contents

    Contents pH 1970i - Contents Overview ........5 Display .
  • Page 4 Contents pH 1970i Maintenance ........53 Cleaning ........53 Disposal .

  • Page 5: Overview

    1970i Overview Overview The portable pH 1970i measuring instrument enables you to carry out pH measurements rapidly and reliably. The pH 1970i provides the maximum degree of operating comfort, reli- ability and measuring certainty for all applications. ® The proven MultiCal calibration procedures support you in your work with the measuring instrument.

  • Page 6: Display

    If you need further information or application notes, you can obtain the following material from WTW: Application reports Primers Safety datasheets. You will find information on available literature in the WTW catalog or via the Internet. Display Status display indicator Sensor symbol...

  • Page 7: Keypad

    1970i Overview Keypad Key functions Switch measuring instrument on/off ON / OFF <ON/OFF> Select the measuring mode <M>: – pH value – ORP voltage Calibrate <CAL> Activate/deactivate the AutoRead function AUTO READ <AUTO READ> Confirm entries, start AutoRead, RUN / ENTER output measured values <RUN/ENTER>...

  • Page 8: Socket Field

    Overview pH 1970i Socket field Sensors You can use the following sensors with the pH 1970i: pH depth armature, or pH electrode (combination electrode or pH electrode + reference electrode). Option: External temperature sensor Please make sure that only one pH sensor is connected at the same time.

  • Page 9: Safety

    1970i Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the pH mea- suring 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.

  • Page 10: General Safety Instructions

    Safety pH 1970i General safety instructions This instrument is built and inspected according to the relevant guide- lines and norms for electronic measuring instruments (see chapter ECHNICAL DATA It left the factory in a safe and secure technical condition. Function and operating...

  • Page 11: Commissioning

    1970i Commissioning Commissioning Scope of delivery Portable measuring instrument, pH 1970i with integrated recharge- able battery Carrying and positioning handle Carrying strap Sensor quiver Plug-in power supply unit Operating manual Power supply Mains operation and You can either operate the measuring instrument with the integrated re- charging the battery chargeable battery or with the plug-in power supply.

  • Page 12: Initial Commissioning

    Connecting the plug-in power supply unit Connect the plug (1) to the socket (2) of the measuring instru- ment. Connect the original WTW plug-in power supply (3) to an easily accessible mains socket. Initial commissioning Perform the following activities: For mains operation and charging the battery: Connect the plug-in power supply (see section 3.2 P...
  • Page 13 1970i Commissioning mg/l Time Baud 0 9 0 4 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Set the date of the current day with <L> <M>. Confirm with <RUN/ENTER>. The date (month) flashes in the display.

  • Page 14: Sensor Quiver

    Commissioning pH 1970i Sensor quiver To store the sensors during field operation and to keep the sensor ele- ment moist, the quiver tip contains a sponge rubber insert that can be moistened with deionized water. Note For further details on proper storage, refer to the operating manual of the sensor.

  • Page 15: Operation

    1970i 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 pH 1970i Measuring 4.2.1 General information You can measure the following variables: pH value ORP voltage Preparatory activities Perform the following preparatory activities when you want to measure: Connect the pH sensor (pH depth armature or pH electrode) to the measuring instrument (see section 1.3 S...
  • Page 17 1970i Operation Note The instrument automatically recognizes the type of the used tempera- ture sensor (NTC30 or Pt1000). The temperature sensor is shown on the display by TP. If you use an electrode without a temperature sensor, proceed as fol-...

  • Page 18: Measuring The Ph Value

    Operation pH 1970i 4.2.2 Measuring the pH value Perform the preparatory activities according to section 4.2.1. Immerse the pH electrode in the test sample. Press the <M> key repeatedly until pH appears on the status display. The pH value appears on the display.

  • Page 19: Measuring The Orp Voltage

    1970i Operation 4.2.3 Measuring the ORP voltage In conjunction with an ORP electrode, e.g. SenTix ORP, the measuring instrument can measure the ORP voltage (U) of a solution. Perform the preparatory activities according to section 4.2.1. Submerse the ORP electrode in the sample.

  • Page 20: Calibrating

    Operation pH 1970i Calibrating Why calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an inexact measured value is dis- played. Calibration determines the current values of the asymmetry and slope of the electrode and stores them in the measuring instru- ment.
  • Page 21 Operation You can select between 3 calibration procedures: AutoCal TEC is specially adapted to the WTW technical buffer solutions as a fully au- tomatic 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 22 Operation pH 1970i Sample printout: CALIBRATION PROTOCOL 02.03.02 14:19 Device No.: 12345678 Calibration pH Cal time: 01.03.02 / 15:20 Cal interval: AutoCal DIN Tauto Buffer 1 1.679 Buffer 2 4.008 Buffer 3 6.865 Buffer 4 9.180 * 174.1 mV 25.0°C -133.3 mV...

  • Page 23: Autocal Tec

    4.3.1 AutoCal TEC For this procedure, use any two or three WTW technical buffer solu- tions in ascending or descending order (pH values at 25 °C: 2.00 / 4.01 / 7.00 / 10.01).
  • Page 24 Operation pH 1970i If necessary, enter the temperature of the first buffer solution with <L> <M>. Immerse the pH electrode in the first buffer solution. Press the <RUN/ENTER> key. The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value ap- pears on the display.
  • Page 25 1970i Operation Press the <RUN/ENTER> key. The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value ap- pears on the display. Example: 1 8 4 4 0 1 % mg/l % mg/l Time Baud Time...

  • Page 26: Autocal Din

    Operation pH 1970i 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 <L> <M>. Immerse the pH electrode in the third buffer solution.
  • Page 27 1970i Operation Press the <CAL> key repeatedly until the Ct1 display indicator and the Auto Cal function display appear. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measuring parameters have been reset).
  • Page 28 Operation pH 1970i % mg/l Time Baud 2 4 8 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng To continue the two-point calibration, thoroughly rinse the electrode with deionized water. If necessary, enter the temperature of the second buffer solu- tion with <L>...
  • Page 29 1970i Operation Press the <RUN/ENTER> key. The instrument displays the value of the asymmetry in calibration range I. % mg/l Time Baud 2 4 8 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Note At this point, the AutoCal DIN calibration can be terminated with <M>.

  • Page 30: Concal

    Operation pH 1970i 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: pH 7.0 ±...
  • Page 31 1970i Operation Note At this point, the ConCal calibration can be broken off with <M>. 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 32 Operation pH 1970i % mg/l Time Baud 2 4 8 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng To return to the measuring mode: Press the <M> key. ba75690e01 01/2007...

  • Page 33: Saving

    1970i Operation Saving The measuring instrument has an internal data memory. It can store up to 500 datasets. A complete data record consists of: Storage location Date/time Measured value Temperature Temperature measuring procedure ID number You can transmit measured values (data records) to the data storage...
  • Page 34 Operation pH 1970i mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Using <L> <M>, enter the required ID number (1 ... 999). Confirm with <RUN/ENTER>. The instrument changes to the measuring mode. StoFull...

  • Page 35: Saving Automatically

    1970i Operation 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. The default setting for the save interval (Int 1) is OFF.
  • Page 36 Operation pH 1970i Confirm with <RUN/ENTER>. The prompt for the ID number appears on the display. mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Set the required ID number with <L> <M>. Confirm with <RUN/ENTER>.

  • Page 37: Outputting The Data Storage

    1970i Operation 4.4.3 Outputting the data storage You can output the contents of the data storage: Stored data on the display Calibration data on the display Stored data on the serial interface Calibration protocol on the interface Outputting stored data Press the <RCL>...
  • Page 38 Operation pH 1970i 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 <L> or <M> repeatedly until the required date appears on the display. After approx. 2 s the temperature of the displayed measured value appears.
  • Page 39 1970i Operation Sample printout: Device No.: 12345678 09.03.02 17:10 pH 10.01 °C Tman Ident : 1 09.03.02 17:11 pH 10.01 24.7 °C Tauto Ident : 1 09.03.02 17:12 305 mV Tauto Ident : Outputting the Press the <RCL> key repeatedly until CAL dISP appears on calibration data the display.
  • Page 40 Operation pH 1970i % mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng In two-point calibration: Using <M> 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 41 1970i Operation Outputting the Press the <RCL> key repeatedly until CAL SEr appears on the calibration protocol display. on the interface mg/l Time Baud S E R ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Press the <RUN/ENTER>...

  • Page 42: Clearing The Memory

    Operation pH 1970i 4.4.4 Clearing the memory With this function, you can delete the stored data records. 500 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 automati- cally switches to the measuring mode.

  • Page 43: Transmitting Data

    1970i Operation Transmitting data You have the following possibilities of transmitting data: One of the following options: – With the AutoStore function (page 35), measured values are periodically saved internally (save interval Int 1) and output on the interface.
  • Page 44 Operation pH 1970i 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, 5 interval min, 10 min, 15 min, 30 min, 60 min): Press the <RUN/ENTER>...

  • Page 45: Recorder (Analog Output)

    1970i 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 AK323 interface cable. The data output automatically switches to Recorder output. 1 free...

  • Page 46: Pc/External Printer (Rs232 Interface)

    Operation pH 1970i 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 AK340/B (PC) or AK325/S (ext. printer) cable to connect the interface to the devices.

  • Page 47: Configuration

    1970i Operation 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 48 Operation pH 1970i Display during the calibration mg/l Time Baud I S P ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Select the required display during the pH calibration with <L> <M>. mV: Display of the current electrode voltage /pH: Display of the buffer nominal value.
  • Page 49 1970i Operation Set the current month with <L> <M>. Confirm with <RUN/ENTER>. The year appears on the display. Set the current year with <L> <M>. Confirm with <RUN/ENTER>. The hours flash on the display. Set the current time with <L> <M>.

  • Page 50: Reset

    Operation pH 1970i 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 51 1970i Operation Resetting the Press the <RUN/ENTER> key and hold it down. measuring parameters Press the <CAL> key. mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Using <L> <M>, switch between no and YES.
  • Page 52 Operation pH 1970i ba75690e01 01/2007...

  • Page 53: Maintenance, Cleaning, Disposal

    1970i Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The measuring instrument is maintenance-free. Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the housing with isopropanol as re- quired. Warning The housing components are made out of synthetic materials (polyurethane, ABS and PMMA).
  • Page 54 Maintenance, cleaning, disposal pH 1970i Measuring instrument, Dispose of the measuring instrument without the rechargeable battery as electronic waste at an appropriate collection point. ba75690e01 01/2007...

  • Page 55: What To Do If

    1970i What to do if... What to do if... Cause Remedy Error message 0FL 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... pH 1970i 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 Cause...
  • Page 57 1970i 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 sample sample too high – Measurement procedure not –...
  • Page 58 What to do if... pH 1970i You want to know which Cause Remedy software version is in – E. g., a question by the WTW – Simultaneously press the the instrument service department <CAL> and <ON/OFF> keys and release them again. The software version is displayed.

  • Page 59: Technical Data

    1970i Technical data Technical data General data Test certificates cETLus, CE Dimensions approx. 90 x 200 x 190 mm Weight approx. 1.5 kg (without plug-in power supply) Mechanical structure Type of protection: IP 67 Electrical safety Protective class: Ambient...
  • Page 60 Technical data pH 1970i Serial interface Automatic switchover when a PC or a printer is connected via the cable, AK 340/B or AK 325/S. Type RS232, data output Baud rate Can be set to 1200, 2400, 4800, 9600 Baud Data bits...

  • Page 61: Measuring Ranges, Resolutions, Accuracies

    1970i Technical data Measuring ranges, resolutions, accuracies Measuring ranges and Variable Measuring range Resolution resolutions - 2.00 ... + 19.99 0.01 U [mV] - 199.9 ... + 199.9 - 1999 ... + 1999 T [°C] - 5.0 ... + 105.0...
  • Page 62 Technical data pH 1970i ba75690e01 01/2007...

  • Page 63: Lists

    1970i 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 64 Asymmetry AutoCal DIN Automatic pH calibration with buffer solutions pre- pared according to DIN 19 266 AutoCal TEC Automatic pH calibration with WTW technical buff- er solutions according to DIN 19267 °C Temperature unit, degrees Celsius Calibration Cd... Display indicator during calibration for pH mea- surements.
  • Page 65 1970i Lists SELV Safety Extra Low Voltage Slope setting on calibration Temperature measurement active (Temperature Probe) Asymmetry...
  • Page 66 AutoRange Name of the automatic selection of the measuring range. AutoRead WTW name for a function to check the stability of the measured value. Calibration Comparing the value from a measuring system (e. g. the displayed value) to the correct value or a value that is regarded as correct. Of- ten, this expression is also used when the measuring system is adjust- ed at the same time (see adjusting).
  • Page 67 1970i 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 68 Lists pH 1970i...
  • Page 69 1970i Index Index ....45 ......56...
  • Page 70 Index pH 1970i ......31 ba75690e01 01/2007...
  • Page 71 Wissenschaftlich-Technische Werkstätten GmbH Dr.-Karl-Slevogt-Straße 1 D-82362 Weilheim Germany Tel: +49 (0) 881 183-0 +49 (0) 881 183-100 Fax: +49 (0) 881 183-420 E-Mail: Info@WTW.com Internet: http://www.WTW.com...

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