wtw inoLab pH/Cond Level 1 Operating Manual
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wtw inoLab pH/Cond Level 1 Operating Manual

Measuring instrument for ph, redox, and conductivity
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Operating manual
inoLab
pH/Cond Level 1
Measuring Instrument
for pH, Redox,
and Conductivity
71
ba12234e03
10/2002

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Summary of Contents for wtw inoLab pH/Cond Level 1

  • Page 1 Operating manual inoLab pH/Cond Level 1 Measuring Instrument for pH, Redox, and Conductivity ba12234e03 10/2002...
  • Page 2 Copyright Weilheim 2002, WTW GmbH & Co. KG © Reprinting - even as excerpts - is only allowed with the ex- plicit written authorization of WTW GmbH & Co. KG, Weilheim. Printed in Germany.

  • Page 3: Table Of Contents

    List of contents Overview ......75 1.1 Keypad .......76 1.2 Display .

  • Page 4: Table Of Contents

    List of contents 5.2 Cleaning ......122 5.3 Disposal ......122 What to do if...

  • Page 5: Ph/Cond Level

    Overview Overview The compact inoLab pH/Cond Level 1 precision measuring instrument lets you perform pH, Redox, and conductivity measurements rapidly and reliably. The inoLab pH/Cond Level 1 provides the highest degree of operating comfort, re- liability and measuring safety for all applications.

  • Page 6: Keypad

    Overview Keypad Measuring instrument ON/OFF Select measuring mode Call up calibration procedure Activate/deactivate AutoRead Confirm inputs, start AutoRead Select measuring mode, increase values, scroll Select measuring mode, reduce values, scroll...

  • Page 7: Display

    Mains power supply (option) Caution Only connect probes to the instrument that cannot feed ex- cessive voltages or currents (> SELV and > circuit with cur- rent limiter). Almost all commercial probes - especially WTW probes - meet these requirements.

  • Page 8: Operating Structure

    Overview 1.4 Operating structure The following overview diagram shows which keys you have to press to select between the different measuring modes: Note The conductivity, salinity and TDS measuring modes only appear if a conductivity measuring cell with temperature pro- be is connected to the instrument.

  • Page 9: Safety

    Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and main- tenance of the instrument. Consequently, all responsible personnel must read this operating manual before working with the instrument. The operating manual must always be available within the vicinity of the instrument.

  • Page 10: Authorized Use

    In this event, wait until the temperature of the instrument reaches room tem- perature before putting the instrument back into operation. Caution The instrument is only allowed to be opened by personnel authorized by WTW.
  • Page 11 Safety Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent op- eration. Safe operation is no longer possible if: the instrument has been damaged in transport the instrument has been stored under adverse conditions for a lengthy period of time the instrument is visibly damaged the instrument no longer operates as described in this...
  • Page 12 Safety...

  • Page 13: Commissioning

    Caution Use original plug-in power supplies only (see chapter 7 T ECHNICAL 1 Insert the plug (1) into the socket (2) of the pH meter. 2 Connect the original WTW plug-in power supply (3) to an easily accessible mains socket.
  • Page 14 Commissioning Scope of delivery Laboratory measuring instrument, inoLab pH/Cond Level 1 Operating manual and short manual 4 x type AA Mignon 1.5 V batteries...

  • Page 15: Operation

    Operation Operation Switch on the instrument 1 Place the instrument on a flat surface and protect it against intense light and heat. 2 Press the key. The display test appears briefly on the display. The instrument then switches automatically to the measuring mode.

  • Page 16: Measuring The Ph Value/Redox Voltage

    Operation Measuring the pH value/Redox voltage Preparatory Perform the following preparatory activities when you want activities to measure: 1 Press the key repeatedly until the pH/Redox mea- surement appears on the display. 2 Connect the electrode to the instrument. 3 Adjust the temperature of the buffer or test solutions or measure the current temperature if the measure- ment is made without a temperature probe.
  • Page 17 Operation The temperature measurement is absolutely essential for a reproducible pH measurement. If the measurement is made without a temperature probe, proceed as follows: 1 Determine the current temperature using a thermo- meter. 2 Press and hold down the key and set up the tem- perature using Note When calibrating without a temperature probe, set up the...

  • Page 18: Measuring The Ph Value

    Operation 4.2.1 Measuring the pH value 1 Perform the preparatory activities according to sec- tion 4.2. 2 Immerse the pH electrode into the test sample. 3 Press the key until pH appears in the status display. The pH value appears on the display. AutoRead AR The AutoRead function (drift control) checks the stability of (Drift control)

  • Page 19: Measuring The Redox Voltage

    Operation Note The current AutoRead measurement (with acceptance of the current value) can be terminated at any time by pressing . It is only possible to change to another measuring mode after AutoRead has been terminated. 4.2.2 Measuring the Redox voltage The instrument can measure the Redox voltage (mV) of a solution when connected with a Redox electrode, e.g.

  • Page 20: Calibrating For Ph Measurements

    Always calibrate after connecting another pH electrode. You can choose between 3 calibration procedures: AutoCal TEC is specially adapted to the WTW technical buffer solutions as a fully automatic two-point calibration. The buffer solu- tions are automatically recognized by the instrument.
  • Page 21 Operation Display Asymmetry Slope [mV] [mV/pH] -15 ... +15 -60.5 ... -58 -20 ... +20 -58 ... -57 -25 ... +25 -61 ... -60.5 -57 ... -56 -30 ... +30 -62 ... -61 -56 ... -50 Clean the electrode accord- ing to the electrode manual <...

  • Page 22: Autocal Tec

    Operation 4.3.1 AutoCal TEC Use any two of the WTW technical buffer solutions for this procedure (pH 2.00, 4.01, 7.00, or 10.00). Note Steps 2 and 6 are not required if you use a temperature probe. 1 Press the key repeatedly until the AutoCal TEC function display appears.
  • Page 23 Operation 6 If necessary, set the temperature of the second buffer solution by pressing 7 Submerse the electrode in the second buffer solution. 8 Press the key. AR flashes on the display. The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, AR disap- pears.

  • Page 24: Autocal Din

    Operation 4.3.2 AutoCal DIN Use two different DIN buffer solutions (type A, C, D or F with the pH values 1.679, 4.006, 6.865, 9.180) for this procedure. Note Steps 2 and 6 are not required if you use a temperature probe.
  • Page 25 Operation 6 If necessary, set the temperature of the second buffer solution by pressing 7 Submerse the electrode in the second buffer solution 8 Press the key. AR flashes on the display. The electrode voltage (mV) appears on the display. As soon as a stable value is recognized, AR disap- pears.

  • Page 26: Concal

    Operation 4.3.3 ConCal Two-point Use two buffer solutions for this procedure: calibration pH 7.0 ± 0.5 any other buffer solution Note Steps 2 and 9 are not required if you use a temperature probe. 1 Press the key repeatedly until the ConCal func- tion display appears.
  • Page 27 Operation 8 Thoroughly rinse the electrode with distilled water. 9 If necessary, set the temperature of the second buffer solution by pressing 10 Submerse the electrode in the second buffer solution. 11 Press the key. The second measured pH value appears on the dis- play.
  • Page 28 Operation Single-point Use a buffer solution in the range pH = 7.0 ± 0.5 for this pro- calibration cedure. Note Only the electrode asymmetry is determined in single-point calibration. The slope of the last two-point calibration is re- tained. Note Step 2 is not required if you use a temperature probe.

  • Page 29: Measuring The Conductivity

    Operation Measuring the conductivity The following parameters can be measured: Conductivity/resistance (how to switch over, see section 4.7 C ONFIGURATION Salinity Total dissolved solids (TDS) The measuring instrument has the following functions: AutoRange (automatic selection of the measuring range), AutoRead (drift control) to check the stability of the mea- suring signal.
  • Page 30 Operation Checking the cell 3 Press the key repeatedly until LF CELL is dis- constant played. 4 Press the key. The previously selected cell con- stant ist displayed, e. g. 0.475 cm 5 To return to the measuring mode: press the when the correct cell constant ist displayed.

  • Page 31: Conductivity / Specific Resistance

    The conductivity measuring cell has an integrated tempera- ture probe that always measures the current temperature of the test sample. If you want to use a WTW conductivity measuring cell with- out a temperature probe, you have to connect it with an adapter (available at WTW).

  • Page 32: Salinity

    Operation Specific resistance 4 Wait for a stable measured value. 4.4.2 Salinity To measure the salinity, proceed as follows: 1 Perform the preparatory activities according to sec- tion 4.4. 2 Immerse the conductivity measuring cell into the test sample. 3 Press the key repeatedly until Sal appears in the status line.

  • Page 33: Tds (Total Dissolved Solids)

    Operation 4.4.3 TDS (total dissolved solids) To measure the TDS, proceed as follows: 1 Perform the preparatory activities according to sec- tion 4.4. 2 Immerse the conductivity cell into the test sample. 3 Press the key repeatedly until TDS appears in the status line.

  • Page 34: Autoread Ar (Drift Control)

    Operation 4.4.4 AutoRead AR (Drift control) The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable ef- fect on the reproducibility of the measured values. 1 Call up the required measuring mode by pressing 2 Immerse the conductivity measuring cell into the test sample.

  • Page 35: Determining/Setting Up The Cell Constant [C]

    Operation Determining/setting up the cell constant [C] Why determine/set Due to ageing, the cell constant slightly changes. As a re- up the cell con- sult, an inexact measured value is displayed. Calibration de- stant? termines the current value of the cell constant and stores this value in the instrument.
  • Page 36 Operation 3 Press the key repeatedly until the following is dis- played. 4 Immerse the measuring cell into the 0.01 mol/l KCL control standard. 5 Press the key to start the AR measurement to de- termine the cell constant. The flashes on the dis- play until a stable signal is reached.
  • Page 37 Operation Calibration After calibrating, the instrument automatically evaluates the evaluation current condition of the calibration. The evaluation appears on the display. Display Cell constant [cm 0.450 ... 0.500 cm 0.800 ... 1.200 cm outside of the ranges 0.450 ... 0.500 cm 0.800 ...

  • Page 38: Setting Up The Cell Constant

    Operation 4.5.2 Setting up the cell constant Setting up the cell To set up the cell constant manually, proceed as follows: constant manually Note The cell constant to be set up must either be taken from the operating manual of the measuring cell or is printed on the measuring cell.
  • Page 39 Operation 4 Set up the cell constant to be used by pressing , e. g. 0.614 cm 5 To return to the measuring mode: press the key. Selecting the To select the 0.100 cm cell constant proceed as follows: 0.100 cm 1 Press the key repeatedly until LF CELL appears cell constant...
  • Page 40 Operation 4 To return to the measuring mode: press the key. Selecting the To select the 0.010 cm cell constant proceed as follows: 0.010 cm 1 Press the key repeatedly until LF CELL appears cell constant on the display. 2 Press the key.

  • Page 41: Setting Up The Temperature Compensation Tc

    Operation Setting up the temperature compensation TC The calculation of the temperature compensation is based on the preset reference temperature, Tref 20 or Tref 25 (see section 4.7 C ONFIGURATION You can select one of the following temperature compensa- tions: Non-linear temperature compensation "nLF"...
  • Page 42 Operation Selecting the non- To select the non-linear temperature compensation proceed linear temperature as follows: compensation 1 Press the key repeatedly until LF tc appears on the display. 2 Press the key. 3 Press the key repeatedly until nLF appears on the display.
  • Page 43 Operation Selecting the linear To select the linear temperature compensation proceed as temperature com- follows: pensation 1 Press the key repeatedly until LF tc appears on the display. 2 Press the key. 3 Press the key repeatedly until the adjustable linear temperature coefficient appears on the display.
  • Page 44 Operation Switching off the To switch off the temp. compensation proceed as follows: temperature com- pensation 1 Press the key repeatedly until LF tc is displayed. 2 Press the key. 3 Press the key until the following display appears: 4 The temperature compensation is switched off.

  • Page 45: Configuration

    Operation Configuration You can adapt the measuring instrument to your require- ments. To do this, the following parameters can be changed (the status on delivery is marked in bold): Temperature probe that is used pH temperature probe, for the pH measurement LF temperature probe Reference temperature 20 °C, 25 °C...
  • Page 46 Operation Temperature probe 4 Set up pH TP or LF TP by pressing 5 Confirm with . t25 or t20 appears on the display Reference temperature 6 With select between t25 and t20 7 Confirm with LF appears on the display. Conductivity or resistance measurement...
  • Page 47 Operation Ω. 8 With select between S/cm and M 9 Confirm with USE appears on the display. Temperature unit 10 With select between °C and °F . 11 Confirm with . The instrument automatically changes to the previously selected measuring mode.

  • Page 48: Reset

    Operation Reset Basic settings You can reset (initialize) the settings for the pH and conduc- tivity measurement separately. pH measurement The following functions for the pH measurement (pH InI) are reset to the values they had on delivery: Measuring mode Asymmetry 0 mV Slope...
  • Page 49 Operation Proceed as follows to reset the settings: 1 Press and hold down the key. 2 Press the key. Resetting the pH settings 3 Toggle between no and yes by pressing yes: reset the settings for pH. no: retain settings. 4 Confirm with .
  • Page 50 Operation...

  • Page 51: Maintenance, Cleaning, Disposal

    Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The measuring instrument is almost maintenance-free. The only maintenance task is replacing the batteries: 1 Open the battery compartment (1) on the underside of the instrument. 2 Remove the four batteries from the battery compart- ment.

  • Page 52: Cleaning

    Maintenance, cleaning, disposal Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the housing with iso- propanol as required. Caution The housing is made of synthetic material (ABS). Thus, avoid contact with acetone or similar detergents that contain solvents.

  • Page 53: Ph System Messages

    What to do if... What to do if... pH system messages Cause Remedy Error message, pH electrode: – Not connected – Connect electrode – Air bubbles in front of the – Remove air bubbles diaphragm – Air in the diaphragm –...
  • Page 54 What to do if... Buffer solutions: – Incorrect buffer solutions – Change calibration procedure – Buffer solutions too old – Only use once. Note the shelf life – Buffer solutions depleted – Change solutions No stable Cause Remedy measured value pH electrode: –...

  • Page 55: Conductivity System Messages

    What to do if... Cause Remedy Obviously incorrect measured values pH electrode: – pH electrode unsuitable – Use suitable electrode – Temperature difference – Adjust temperature of between buffer and buffers or samples sample too large – Measuring procedure not –...

  • Page 56: General Errors

    You would like to Cause Remedy know which soft- – e.g. question of the WTW – Press the key and ware version is in service department switch on instrument. the instrument The software version...

  • Page 57: Technical Data

    Technical Data Technical Data General data Storage temperature - 25 °C ... + 65 °C Ambient temperature Operating temperature 0 °C ... + 55 °C Allowable relative humid- Annual mean: < 75 % 30 days/year: 95 % Other days: 85 % Length [mm] Dimensions and weight...

  • Page 58: Ph/Redox Measurement

    Technical Data Batteries 4 x 1.5 V AA type alkaline manganese Energy supply batteries Runtime Approx. 3000 operating hours Mains power Connection max. overvoltage catego- supply (option) ry II (valid for all plug-in power sup- plies): Plug-in power supply (Euro plug): FRIWO FW1199, 11.7864 Friwo Part.

  • Page 59: Conductivity Measurement

    Technical Data ± 0.01 Accuracy (after calibration) (± 1 digit) U [mV] ± 0.3 (at + 15 °C ... + 35 °C) ± 1 T [°C] ± 0.1 T [°F] ± 0.2 Manually [°C] - 5 ... + 100 Temperature input Conductivity measurement [µS/cm]...
  • Page 60 0 °C ... 35 °C according to EN 27 888; ± 0.5 % 35 °C ... 50 °C extended nLF function according to WTW measurements Linear compensation Accuracy Test sample temperature ± 0.5 % 10 °C ... 75 °C (the accuracy percentage always re- fers to the measured value!) Range 0.0 ...
  • Page 61 Technical Data T [°F] ± 0.2 Cell constant, C [cm 0.010 to be set 0.100 0.250 ... 2.500 Cell constant, C [cm 0.450 ... 0.500 calibrated 0.800 ... 1.200 Reference tempera- [°C] ture, selectable...
  • Page 62 Technical Data...

  • Page 63: List

    Lists Lists This chapter provides additional information and orientation aids. Abbreviations The list of abbreviations explains abbreviations that appear on the display or when dealing with the instrument. Specialist terms 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.
  • Page 64 Calibration with DIN buffer solutions (acc. to DIN 19 266) CELL Cell constant ConCal Conventional one/two point calibration Ct... Calibration with WTW technical buffer so- lutions Error message (see W ...) HAT TO DO IF °F Temperature unit, Fahrenheit Initialization...
  • Page 65 Lists Voltage unit mV/pH Unit of the electrode slope Non linear temperature compensation Overflow Display range exceeded pH value Slope Salinity SELV Safety Extra Low Voltage Slope Slope setting on calibration Temperature coefficient Total dissolved solids Temperature probe Temperature measurement active Tref 20/T20 Reference temperature 20 °C Tref 25/T25...
  • Page 66 Lists Glossary Asymmetry Zero point of a pH electrode. AutoRange Automatic selection of the measuring range. AutoRead Monitors the electrode drift and releases the measured val- ue only after the stability criterion has been reached. In this way, this procedure ensures the highest degree of precision and reproducibility.
  • Page 67 Lists Drift control See A ® MultiCal Group term for the various WTW pH calibration procedures used for automatic calibration in buffer solutions. Redox voltage Potentiometric quantity. Reference In order to compare values measured at different tempera- temperature tures, the values have to be converted to a fixed tempera- ture.
  • Page 68 Lists Total dissolved Mass that remains of the substances dissolved in an aque- solids (TDS) ous solution after a fixed filtering and drying procedure, as far as these substances are not volatile under the conditions of this procedure. The total dissolved solids refer to the vo- lume of the filtered aqueous sample used und are given in mg/l.
  • Page 69 Lists Index asymmetry operating structure authorized use operational safety AutoCal DIN 90, 94 AutoCal TEC 90, 92 place of the instrument AutoRead 88, 104 plug-in power supply basic settings Redox electrode battery compartment Redox voltage reference temperature calibrating reference temperature, set calibration replacing the batteries evaluation...
  • Page 70 Lists ConCal...

  • Page 71: Appendix

    Appendix Appendix...
  • Page 72 Appendix Note If you need further informationen or application notes you can ask for: Application reports Primers Safety data sheets. You can find information on available literature in the WTW or via the catalog, L ABORATORY AND IELD NSTRUMENTATION Internet.

This manual is also suitable for:

Inolab ph/cond 720

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