wtw inoLab pH/ION 735 Operating Manual
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wtw inoLab pH/ION 735 Operating Manual

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Operating manual
inoLab pH/ION 735
pH/ION meter
ba75449e02
03/2005

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Summary of Contents for wtw inoLab pH/ION 735

  • Page 1 Operating manual inoLab pH/ION 735 pH/ION meter ba75449e02 03/2005...
  • Page 2 The continuous development of our meter software is part of the process of consequently improving our products. The current meter software for the inoLab pH/ION 735 can be found on the Internet. It can easily be transmitted to your meter with the aid of the supplied AK 340/B cable and a PC.

  • Page 3: Table Of Contents

    735 Contents Overview ........5 General features .
  • Page 4 Contents inoLab pH/ION 735 Storage ........58 4.6.1...

  • Page 5: Overview

    Overview Overview General features The inoLab pH/ION 735 compact precision pH meter enables you to carry out pH measurement, ORP measurements and concentration measurements with ion sensitive electrodes quickly and reliably. The inoLab pH/ION 735 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.

  • Page 6: Keypad

    Cancel inputs Store a measured value Switch between pH measurement and ORP measurement, in- crease values, scroll Confirm entries, start AutoRead Switch between pH measurement and ORP measurement, decrease values, scroll * only on the inoLab pH/ION 735 with integrated printer...

  • Page 7: Display

    735 Overview Display The graphical display can indicate up to three measuring windows at the same time. The illumination enables to read the display even in the darkness. You can modify the display to meet your requirements in multiple ways.
  • Page 8 735 Warning Only connect sensors to the meter that cannot return any voltages or currents that are not allowed (> SELV and > current circuit with current limiting). Almost all sensors - in particular WTW sensors - fulfill these conditions.

  • Page 9: Safety

    735 Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the 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 10: General Safety Instructions

    Safety inoLab pH/ION 735 General safety instructions This instrument is built and inspected according to the relevant guide- lines and norms for electronic meters (see chapter 7 T ECHNICAL DATA It left the factory in a safe and secure technical condition.

  • Page 11: Commissioning

    735 Commissioning Commissioning Scope of delivery ! inoLab pH/ION 735 laboratory meter ! Operating manual and short instructions in the printer cover ! 4 NiMH rechargeable batteries 1.2 V Mignon type AA ! Power pack Power supply Line-powered operation...

  • Page 12: Initial Commissioning

    When you set the language, date and time according to the mentioned sections of this operating manual you will quickly be familiar with the simple operation of the inoLab pH/ION 735. * only on the inoLab pH/ION 735 with integrated printer...

  • Page 13: Operation

    735 Operation Operation Switching on the meter Switching on Press the e key. The measured value display appears. 6.949 25.0 °C 20.09.04 10:37 Switching off Press the e key. Automatic switchoff The instrument has an automatic switchoff function in order to save the batteries (see section 4.3.2).

  • Page 14: General Operating Principles

    Operation inoLab pH/ION 735 General operating principles This section contains basic information of the operation of the inoLab pH/ION 735. Operating elements, An overview of the operating elements and the display is given in display section 1.2 and section 1.3.

  • Page 15: Navigation

    735 Operation 4.2.2 Navigation Measured value display In the measured value display, you can ! select a measuring window with 82 and open the relevant measuring menu by shortly pressing g. ! open the system menu with the sensor-independent settings by pressing g for a long time (approx.
  • Page 16 Operation inoLab pH/ION 735 ! Functions Functions are designated by the name of the function. They are im- mediately carried out by confirming with g. Example: Display the Calibration record function. Cal. type Calibration interval Unit for slope mV/pH Calibration record i 2.00 4.01 7.00 10.01...

  • Page 17: Navigation Example 1: Setting The Language

    735 Operation 4.2.3 Navigation example 1: Setting the language Press the e key. The measured value display appears. The instrument is in the measuring mode. 7.00 25.0 °C 20.09.04 10:37 Open the system menu by pressing g for a long time (approx.
  • Page 18 Operation inoLab pH/ION 735 Open the General submenu with g. System Language Deutsch Beep Illumination Contrast 48 % Temperature unit °C Switchoff time 30 min Open the setting mode for the Language with g. System Language Deutsch Beep Illumination Contrast...

  • Page 19: Navigation Example 2: Setting The Date And Time

    735 Operation 4.2.4 Navigation example 2: Setting the date and time The meter has a clock with a date function. The date and time are indi- cated in the status line of the measured value display. The indication can be switched off.
  • Page 20 Operation inoLab pH/ION 735 Change and confirm the setting with 82 and g. The time is set. If necessary, set the Date and Date format. The setting is made similarly to that of the time. If necessary, select and set the Date with 82 and g.

  • Page 21: System Settings (System Menu)

    735 Operation System settings (system menu) The system menu comprises the following settings: ! Data storage (see section 4.3.1) ! System (see section 4.3.2). 4.3.1 Data storage This menu contains all functions to display, edit and erase stored mea- sured values and calibration records.
  • Page 22 Operation inoLab pH/ION 735 Menu item Setting Description System / General / Il- Switching the display illu- lumination mination on/off System / General / 0 ... 100 % Changing the display con- Contrast trast System / General / °C Temperature unit, Temperature unit °F...

  • Page 23: Ph Value / Orp Voltage

    735 Operation pH value / ORP voltage 4.4.1 General information You can measure the following variables: ! pH value [ ] ! ORP [mV] Warning When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

  • Page 24: Measuring The Ph Value

    Operation inoLab pH/ION 735 Preparatory activities Perform the following preparatory activities when you want to measure: Connect a pH or ORP electrode to the meter. The pH/ISE measuring window is displayed. If necessary, select the pH or mV display with m.

  • Page 25: Measuring The Orp Voltage

    735 Operation 4.4.3 Measuring the ORP voltage Note ORP electrodes are not calibrated. However, you can check ORP elec- trodes using a test solution. Perform the preparatory activities according to section 4.4.1. Submerse the ORP electrode in the sample.
  • Page 26 Operation inoLab pH/ION 735 Settings The settings are made in the measuring menu of the pH/ORP measure- ment. To open the settings, activate the relevant measuring window in the measured value display and press the g key shortly. After com- pleting the settings, switch to the measured value display with m.

  • Page 27: Ph Calibration

    735 Operation 4.4.5 pH calibration 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 meter.
  • Page 28 Operation inoLab pH/ION 735 Calibration points Calibration can be performed using one, two or three buffer solutions in any order (single-point-, two-point or three-point calibration). The meter determines the following values and calculates the calibration line as follows: Determined val-...
  • Page 29 735 Operation Sample record: 31.08.04 16:13 inoLab pH/ION 735 Ser. no. 12345678 CALIBRATION pH Calibration date 01.08.04 00:14:03 Cal. interval AutoCal TEC Buffer 1 7.00 Voltage 1 -0.2 mV 26.3 øC Slope -59.2 mV/pH Asymmetry -0.5 mV Sensor Calibration evaluation After calibrating, the meter automatically evaluates the calibration.

  • Page 30: Carrying Out The Tec And Nist/Din Calibration

    (see section 4.4.5). Make sure that the Cal. type is correctly set in the sensor menu (see section 4.4.4). For this procedure, use any one, two or three WTW technical buffer so- lutions in ascending or descending order.
  • Page 31 735 Operation Select Continue with 82 and press g. The buffer is mea- sured. The measured value is checked for stability (AutoRead). pH <CAL> Displayed: i Buffer value = 7.000 – Recognized nominal buffer i U = 3.0 mV value (referring to 25 °C)
  • Page 32 Operation inoLab pH/ION 735 Continuing for two-point Thoroughly rinse the electrode with distilled water. calibration (Cal. type TEC) Immerse the electrode in buffer solution 2. If the Set temperature menu item appears, measure and enter the temperature of the buffer manually (measurement without temperature sensor).
  • Page 33 735 Operation Continuing for three- Thoroughly rinse the electrode with distilled water. point calibration to six- point calibration Immerse the electrode in buffer solution 3. (Cal. type TEC) If necessary, measure the temperature of buffer 3 manually, then enter and confirm it with 82 and g in the Set temper- ature setting.

  • Page 34: Carrying Out A Concal Calibration

    Operation inoLab pH/ION 735 4.4.7 Carrying out a ConCal calibration Single-point calibration Use any buffer solution for this rapid method. The calibration will be exacter if the pH value of the buffer solution is closer to that of the test sample.
  • Page 35 735 Operation pH <CAL> i Buffer value = 6.80 i U = 12.0 mV i Temperature = 24.8 °C Terminate AutoRead Wait for the end of the AutoRead measurement or Terminate AutoRead and accept the calibration value with g.
  • Page 36 Operation inoLab pH/ION 735 Continuing for two-point Thoroughly rinse the electrode with distilled water. calibration (Cal. type Immerse the electrode in buffer solution 2. ConCal) Set the nominal buffer value with g and 82. Then confirm the value with g.

  • Page 37: Ion Concentration

    735 Operation Ion concentration 4.5.1 General information Note Incorrect calibration of ion sensitive electrodes will result in incorrect measured values. Calibrate regularly before measuring. Warning When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

  • Page 38: Measuring The Ion Concentration

    Operation inoLab pH/ION 735 4.5.2 Measuring the ion concentration Perform the preparatory activities according to section 4.5.1. Immerse the electrode in the test sample. 0.157 mg/l °C 20.09.04 10:37 AutoRead The AutoRead function (drift control) continually checks the stability of (drift control) the measurement signal.
  • Page 39 735 Operation Menu item Possible set- Description ting Calibration record Displays the calibration record of the last calibra- tion. Man. temperature -20 ... +130 °C Entry of the manually de- termined temperature. For measurements without temperature sensor only.

  • Page 40: Calibrating For Ise Measurements

    Operation inoLab pH/ION 735 4.5.4 Calibrating for ISE measurements Why calibrate? Ion-selective electrodes age and are temperature-dependent. This changes the slope. As a result, an inexact measured value is displayed. Calibration determines the calibration line of the electrode and stores this value in the meter.
  • Page 41 735 Operation After accepting the new calibration data the calibration record is dis- played. Note Based on the calibration data, the calibration line is determined in sec- tions. A straight line of the calibration is determined according to the Nernst equation between the highest and second highest calibration standard.
  • Page 42 Operation inoLab pH/ION 735 Preparatory activities Perform the following preparatory activities when you want to calibrate: Connect the ISE combination electrode to the meter. The pH/mV/ISE measuring window is displayed. Keep the standard solutions ready. If necessary, measure the temperature of the standard solu- tions with a thermometer.
  • Page 43 735 Operation ISE <CAL> i Standard = 0.010 mg/l i U = 0.5 mV Terminate AutoRead Wait for the end of the AutoRead measurement or accept the calibration value with g. The calibration display for the next standard solution appears.
  • Page 44 Operation inoLab pH/ION 735 Wait for the end of the AutoRead measurement or accept the calibration value with g. The calibration display for the next standard solution appears. ISE <CAL> i #2 0.020 mg/l 24 °C i Immerse sensor in std. 3 Set temperature: 24 °C...

  • Page 45: Selecting The Measuring Method

    735 Operation 4.5.5 Selecting the measuring method The following methods are supported: ! Standard addition (Std. add.) ! Standard subtraction (Std. sub.) ! Sample addition (Sample add.) ! Sample subtraction (Sample sub.) ! Blank value addition (Blank add.) Perform the preparatory activities according to section 4.5.1.

  • Page 46: Standard Addition (Std. Add.)

    Operation inoLab pH/ION 735 4.5.6 Standard addition (Std. add.) In the "Standard addition" procedure, a known amount of standard so- lution is added to the sample. The ion concentration in the sample is calculated from the change in potential. Select the measuring method (see section 4.5.5).
  • Page 47 735 Operation Standard addition i Add standard i U = 19.0 mV Continue Add the standard solution to the sample. Start the measurement with g. When the measurement is finished an entry window appears. Standard addition Std. volume 1.0 ml...

  • Page 48: Standard Subtraction (Std. Sub.)

    Operation inoLab pH/ION 735 4.5.7 Standard subtraction (Std. sub.) In the "Standard Subtraction" procedure, a known amount of standard solution is added to the sample (as complexing agent or precipitating agent) and, thus, the ion concentration lowered. The ion concentration in the sample is calculated from the change in potential.
  • Page 49 735 Operation Standard subtraction i Add standard i U = 19.0 mV Continue Add the standard solution to the sample. Start the measurement with g. When the measurement is finished an entry window appears. The info line indicates the current setting for the ion sensitive electrode [e.g.
  • Page 50 Operation inoLab pH/ION 735 If necessary, set the ion type for the ion in the sample (Ion type (ISE)) with 82 and g. The relevant data Valency and Molar mass is displayed auto- matically. With selection of the ion type that can be defined (??): Using 82 and g, set the valence (Valency) and molar weight (Molar mass) for the ion in the standard solution.

  • Page 51: Sample Addition (Sample Add.)

    735 Operation 4.5.8 Sample addition (Sample add.) In the "Sample addition" procedure, a known amount of sample is add- ed to the standard solution. The ion concentration in the sample is calculated from the change in potential. Select the measuring method (see section 4.5.5).
  • Page 52 Operation inoLab pH/ION 735 Sample addition i Add sample i U = 22.0 mV Continue Add the sample to the standard solution. Start the measurement with g. When the measurement is finished an entry window appears. Sample addition Sample volume 1.0 ml...

  • Page 53: Sample Subtraction (Sample Sub.)

    735 Operation 4.5.9 Sample subtraction (Sample sub.) In the "Sample Subtraction" procedure, a known amount of sample is added to the standard solution. The ion concentration in the sample is calculated from the change in potential. The sample subtraction is one method for the indirect determination of ions.
  • Page 54 Operation inoLab pH/ION 735 Select Continue with 82 and start the measurement with g. When the measurement is finished an info window appears. Sample subtraction i Add sample i U = 22.0 mV Continue Add the sample to the standard solution.
  • Page 55 735 Operation If necessary, set the ion type for the ion in the sample ( Ion type (ISE)) with 82 and g. The relevant data Valency and Molar mass is displayed auto- matically. With selection of the ion type that can be defined (??): Using 82 and g, set the valence (Valency) and molar weight (Molar mass) for the ion in the standard solution.

  • Page 56: Standard Addition With Blank Value Correction

    Operation inoLab pH/ION 735 4.5.10 Standard addition with blank value correction (Blank add.) In the "Standard addition with blank value correction" procedure, a known amount of standard solution is added to the sample in two steps. With the first addition, the ion concentration is raised to the linear range of the electrode characteristic curve.
  • Page 57 735 Operation Using 82 and g, enter the values for the volume of the sample (Sample volume), the volume of the ISA/TISAB solu- tion (ISA/TISAB vol.), the volume of the blank value solution (BV volume) and the concentration of the blank value solution (BV concentration).

  • Page 58: Storage

    Operation inoLab pH/ION 735 Terminate the measuring method with #. A security prompt appears. Select Yes with 82. Confirm Yes with g. Measurement with the selected method is completed. Storage You can transmit measured values (data records) to the data storage in two ways: ! Manual storage (see section 4.6.1)

  • Page 59: Manual Storage

    735 Operation 4.6.1 Manual storage Proceed as follows to transmit to the data storage and simultaneously output to the interface a measurement dataset: Press the <STO> key shortly. The menu for manual storage appears. <STO> 1 of 646 - 30.10.2003 11:24:16...

  • Page 60: Automatic Storage At Intervals

    Operation inoLab pH/ION 735 4.6.2 Automatic storage at intervals The storage interval (Interval) determines the chronological interval be- tween automatic storage processes. Each storage process transmits the current dataset to the interface at the same time. Configuring the auto- Press the <STO> key for a long time.
  • Page 61 735 Operation Storage administration The two lower display lines indicate the use of the storage calculated in advance for the selected settings: <STO_> Store with ID no. Adjusted storage duration for the Interval 30 s entire dataset series...

  • Page 62: Editing The Measured Value Storage

    Operation inoLab pH/ION 735 Terminating the auto- Proceed as follows to switch off the automatic storage function before matic storage function the adjusted storage duration has expired: prematurely Press the <STO> key for a long time. The following window appears.
  • Page 63 735 Operation Settings Menu item Setting/func- Description tion Data storage / Displays in pages all mea- Manual data storage / suring datasets that corre- Display spond to the filter settings. Further options: ! Scroll through the datasets with 82.
  • Page 64 Operation inoLab pH/ION 735 Data filter Menu item Setting/func- Description tion Filter Filter criteria: No filter Data filter switched off Date & ID Selection according to pe- number riod and ID number ID number Selection according to ID number Date...

  • Page 65: Erasing The Measured Value Storage

    735 Operation Sample printout 31.08.04 15:48:08 inoLab pH/ION 735 Ser. no. 12345678 ID number: 1 0.316 mg/l 22 °C, AR ________________________________________ 31.08.04 09:56:20 inoLab pH/ION 735 Ser. no. 12345678 ID number: 1 6.12 24.8 °C, AR ________________________________________ 31.08.04 09:27:24 inoLab pH/ION 735 Ser.

  • Page 66: Displaying And Outputting Calibration Records

    Operation inoLab pH/ION 735 4.6.5 Displaying and outputting calibration records You can display the calibration data ! of one selected sensor, or ! of all sensors connected and then output them to the interface. Displaying the calibra- The calibration record of the last calibration can be found under the Cal-...
  • Page 67 735 Operation Sample printout 03.08.04 20:18 inoLab pH/ION 735 Ser. no. 12345678 CALIBRATION pH Calibration date 01.08.04 00:14:03 Cal. interval AutoCal TEC Buffer 1 7.00 Voltage 1 -0.2 mV 26.3 øC Slope -59.2 mV/pH Asymmetry -0.5 mV Sensor...

  • Page 68: Transmitting Data (Rs 232 Interface)

    Operation inoLab pH/ION 735 Transmitting data (RS 232 interface) 4.7.1 Options for data transmission Via the RS 232 interface, you can transmit data to a PC or an external printer. The following table shows which data are transmitted to the in-...

  • Page 69: Connecting A Pc/External Printer

    735 Operation 4.7.2 Connecting a PC/external printer Use the AK340/B (PC) or AK325/S (ext. printer) cable to connect the interface to the devices. Warning 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.

  • Page 70: Reset

    Operation inoLab pH/ION 735 Reset You can reset (initialize) all sensor settings and sensor-independent settings separately from each other. 4.8.1 Resetting the sensor settings Note The calibration data are reset to the default settings together with the measuring parameters. Recalibrate after performing a reset.

  • Page 71: Resetting The System Settings

    735 Operation 4.8.2 Resetting the system settings The following system settings can be reset to the delivery status: Setting Default settings Language English Temperature unit °C Beep Baud rate 4800 Baud Output format ASCII Contrast 40 % Illumination...
  • Page 72 Operation inoLab pH/ION 735...

  • Page 73: Maintenance, Cleaning, Disposal

    735 Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The only maintenance activities are: ! exchanging the rechargeable batteries and ! exchanging the roll of printer paper. Note For maintenance of the electrodes refer to the relevant operating man-...

  • Page 74: Exchanging The Rechargeable Batteries

    Maintenance, cleaning, disposal inoLab pH/ION 735 5.1.1 Exchanging the rechargeable batteries Warning Always use the specified NiMH rechargeable batteries (see chap- ter 7 T ). Using normal batteries can damage the ECHNICAL DATA meter. Open the battery compartment (1) on the underside of the meter.

  • Page 75: Exchanging The Roll Of Paper

    (3) from below. Press the Print key f (paper feed). Close the printer lid (1). Note Use original WTW rolls of paper only. You will find information on this in the WTW catalog L or via the In- ABORATORY AND...

  • Page 76: Disposal

    Maintenance, cleaning, disposal inoLab pH/ION 735 Disposal Packing This meter is sent out in a protective transport packing. We recommend: Keep the packing material. The original packing pro- tects the meter from transport damages. Rechargeable batteries Remove the rechargeable battery from the instrument and dispose of it at a suitable facility according to local legal requirements.

  • Page 77: What To Do If

    735 What to do if... What to do if... pH and ORP measurement Error message, Cause Remedy OFL or UFL Electrode: (measuring range exceeded or undercut) – Air bubble in front of the – Remove air bubble diaphragm –...
  • Page 78 What to do if... inoLab pH/ION 735 No stable measured Cause Remedy value pH electrode: – Diaphragm contaminated – Clean diaphragm – Membrane contaminated – Clean membrane Test sample – pH value not stable – Measure with air excluded if necessary –...

  • Page 79: Ise Measurement

    735 What to do if... ISE measurement Error message OFL Cause Remedy – Measuring range exceeded – Dilute test sample Obviously incorrect Cause Remedy measured values – Electrode not connected – Connect electrode – Cable broken – Replace electrode...

  • Page 80: General Errors

    Printer operating - Cause Remedy paper not being printed * – Paper inserted with wrong side – Turn the roll of paper around upwards and insert it with the other side upwards only on the inoLab pH/ION 735 with integrated printer...
  • Page 81 735 What to do if... Display, LoBat Cause Remedy – Batteries almost empty – Charge the batteries (see section 3.2) Instrument does not Cause Remedy react to keystroke – Operating condition undefined – Processor reset: or EMC load unallowed Press the e and # key simultaneously.
  • Page 82 What to do if... inoLab pH/ION 735...

  • Page 83: Technical Data

    735 Technical data Technical data General data Dimensions approx. 172 x 80 x 37 mm Weight approx. 0.3 kg (without power pack) Mechanical structure Type of protection IP 66 Electrical safety Protective class Test certificates cETLus, CE Ambient conditions Storage - 25 °C ...

  • Page 84: Measuring Ranges, Resolution, Accuracy

    Technical data inoLab pH/ION 735 Measuring ranges, resolution, accuracy 7.2.1 pH/ORP Measuring ranges, Variable Measuring range Resolution resolution - 2.000 ... + 20.000 0.001 - 2.00 ... + 20.00 0.01 U [mV] - 999.9 ... + 999.9 - 2000 ... + 2000 T [°C]...

  • Page 85: Lists

    735 Lists Lists This chapter provides additional information and orientation aids. Abbreviations The list of abbreviations explains the indicators and 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 86 Cal. type NIST/ Automatic pH calibration with buffer solutions pre- pared according to NIST or DIN 19 266 Cal. type TEC Automatic pH calibration with WTW technical buff- er solutions according to DIN 19267 °C Temperature unit, degrees Celsius Calibration...
  • Page 87 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 88 The slope of a linear calibration function. Slope (relative) Designation used by WTW in the DO measuring technique. It ex- presses the relationship of the slope value to the value of a theoretical reference sensor of the same type of construction.

  • Page 89: Index

    735 Index Index ....27 ......74 Asymmetry of the pH electrode Exchanging the batteries ...........9 ..... 75 Authorized use Exchanging the roll of paper ......11, 13 Automatic switchoff AutoRead ............38 ............64 Filter ..........25 ........91 Firmware update .............24...
  • Page 90 Index inoLab pH/ION 735 Three-point calibration ........... 44 ..... 10 Obligations of the purchaser ............ 33 ........10 Operating safety ........68 Transmitting data ....68 Transmitting measured values Two-point calibration ......29 pH calibration evaluation ........... 43 ..........11 Power pack ..........

  • Page 91: Appendix: Updating The Meter Software

    ! a minimum of 10 MB free storage ! a free serial interface (COM port) on your PC ! the AK 340/B interface cable (part of the inoLab pH/ION 735 scope of delivery) ! the installation program to update the meter software.
  • Page 92 Appendix: Updating the meter software inoLab pH/ION 735...
  • Page 93 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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