wtw Multi 197i Operating Manual
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wtw Multi 197i Operating Manual

Portable ph / oxygen / conductivity measuring instrument
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Operating manual
Multi 197i
Portable pH / oxygen / conductivity measuring instrument
ba75339e04
07/2009

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  • Page 1 Operating manual Multi 197i Portable pH / oxygen / conductivity measuring instrument ba75339e04 07/2009...
  • Page 2 © Copyright Weilheim 2005, WTW GmbH Reproduction in whole - or even in part - is prohibited without the ex- press written permission of WTW GmbH, Weilheim. Printed in Germany. ba75339e04 07/2009...

  • Page 3: Table Of Contents

    Multi 197i List of contents Overview ........5 General features .
  • Page 4 List of contents Multi 197i Transmitting data ......55 4.8.1 Data transmission interval (Int 2) ... . 55 4.8.2...

  • Page 5: Overview

    The Multi 197i portable multiparameter measuring instrument enables you to carry out pH measurements, dissolved oxygen (D. O.) measure- ments and conductivity measurements quickly and reliably. The Multi 197i provides the maximum degree of operating comfort, re- liability and measuring certainty for all applications. ®...

  • 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: Jack Field

    (> SELV and > current cir- cuit with current limiting). Almost all sensors - in particular WTW sensors - fulfill these conditions. Maximum number The following sensors can be connected to the Multi 197i (maximum...

  • Page 8: Ba75339E04

    Overview Multi 197i Connectors: Sensor / Instrument Socket / Posi- tion pH depth armature pH electrode or pH combination electrode pH combination electrode with temperature sensor 2 and 4 Reference electrode Temperature sensor, external 3 and 4 Oxygen sensor 5 or 6...

  • Page 9: Safety

    Multi 197i Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the measur- ing instrument. Consequently, all responsible personnel must read this operating manual before working with the measuring system. The op- erating manual must always be available within the vicinity of the mea- suring system.

  • Page 10: General Safety Instructions

    Safety Multi 197i 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

    Multi 197i Commissioning Commissioning Scope of delivery Multi 197i portable multiparameter measuring instrument with inte- grated rechargeable battery Carrying and positioning handle Carrying strap 2 sensor quivers (pH and Oxi-LF type) Plug-in power supply unit Operating manual Power supply Mains operation and...

  • 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 Multi 197i 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 <▲> <▼>. Confirm with <RUN/ENTER>. The date (month) flashes in the display.

  • Page 14: Sensor Quiver

    Commissioning Multi 197i 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

    Multi 197i Operation Operation Operating structure Active and inactive REL In addition to the pH/ORP sensor, the sensor on the REL1 or REL2 socket socket can be actuated (switched "active"). The other socket is not ac- tuated ("inactive"). This switching over inside the instrument is made with the aid of a relay.

  • Page 16: Switching On The Measuring Instrument

    Operation Multi 197i Note When a sensor is connected to the active REL socket, the measuring instrument recognizes the sensor or the measuring cell and automati- cally switches to the measuring mode that was last active. As soon as the sensor is disconnected from the active REL socket, the instrument switches to the pH (mV) measuring mode again.

  • Page 17: Ph Value / Orp Voltage

    Multi 197i Operation pH value / ORP voltage 4.3.1 General information Preparatory activities Perform the following preparatory activities when you want to measure: Connect the pH depth armature or the pH electrode to the mea- suring instrument. If necessary, press the <M> key repeatedly until the pH (pH measurement) or U (measurement of the ORP voltage) display appears.
  • Page 18 Operation Multi 197i Temperature measure- You can perform pH measurements with or without a temperature sen- ment in pH measure- sor as well as with the temperature sensor of an oxygen sensor or a ments conductivity measuring cell. The measuring instrument recognizes which sensors are connected and switches automatically to the correct mode for the temperature measurement.

  • Page 19: Measuring The Ph Value

    Multi 197i Operation 4.3.2 Measuring the pH value Perform the preparatory activities according to section 4.3.1. Immerse the pH electrode in the test sample. Press the <▲> <▼> keys repeatedly until pH appears on the status display. The pH value appears on the display.

  • Page 20: Measuring The Orp Voltage

    Operation Multi 197i Activate the AutoRead function with <AUTO READ>. The current measured value is frozen (hold function). Start AutoRead with <RUN/ENTER>. AR flashes until a stable measured value is reached. This measured value is transmitted to the interface. If necessary, start the next AutoRead measurement with <RUN/ENTER>.

  • Page 21: Ph Calibration

    Asymmetry = ASY Slope = SLO AutoCal TEC is specially matched to the WTW technical buffer solutions as a fully au- tomatic two-point calibration. The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see section 4.9 C...
  • Page 22 Operation Multi 197i Note You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.8.2 before calibrating. After a valid calibration, the record is printed. Sample printout: CALIBRATION PROTOCOL 02.03.02...
  • Page 23 Multi 197i Operation Calibration evaluation After calibrating, the measuring instrument automatically evaluates the calibration. The asymmetry and slope are evaluated separately. The worst evaluation appears on the display. Display Asymmetry Slope [mV] [mV/pH] -15 ... +15 -60.5 ... -58 -20 ... +20 -58 ...
  • Page 24 25 °C: 2.00 / 4.01 / 7.00 / 10.01). Note The calibration for pH 10.01 is optimized for the WTW technical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the WTW catalog or in the Internet.
  • Page 25 Multi 197i Operation 7 0 0 % mg/l % mg/l Time Baud 2 4 8 Time Baud 2 4 8 ° ° Day.Month Day.Month Year Ident Year Ident Tref25 Tref20 Auto REL1 REL2 Tref25 Tref20 Auto REL1 REL2 LoBat ARng...
  • Page 26 Operation Multi 197i 1 8 4 4 0 1 % mg/l % mg/l Time Baud 2 4 8 Time Baud 2 4 8 ° ° Day.Month Day.Month Year Ident Year Ident Tref25 Tref20 Auto REL1 REL2 Tref25 Tref20 Auto REL1...

  • Page 27: Dissolved Oxygen

    4.4.1 General information Note D. O. measurements with the Multi 197i can only be carried out using a CellOx 325 or StirrOx G D. O. sensor. The stirrer of the StirrOx G D. O. sensor has to be supplied with voltage separately using the NT/pH Mix 540 power supply.
  • Page 28 Operation Multi 197i Note Incorrect calibration of D. O. probes will result in incorrect measured values. Calibrate at regular intervals. Temperature sensor The D. O. sensor has an integrated temperature sensor that always measures the current temperature of the test sample.

  • Page 29: Measuring The D. O. Concentration

    Multi 197i Operation 4.4.2 Measuring the D. O. concentration When measuring the concentration of test samples with a salt content of more than 1 g/l, a salinity correction is required. Note How to enter the current salt content is described in section 4.4.6 E...

  • Page 30: Measuring The D. O. Saturation

    Operation Multi 197i mg/l Time Baud 1 7 6 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng While pressing the <RUN/ENTER> key, switch off the salt con- tent correction with <▼>. The SAL display indicator is no longer displayed.

  • Page 31: Autoread Ar (Drift Control) And Hold Function

    Multi 197i Operation 4.4.4 AutoRead AR (Drift control) and hold function The AutoRead function (drift control) checks the stability of the mea- surement signal. The stability has a considerable impact on the repro- ducibility of the measured values. With the aid of the hold function the measured value display is frozen.

  • Page 32: Calibration

    Operation Multi 197i 4.4.5 D. O. calibration Why calibrate? D. O. probes age. This changes the slope of the D. O. sensor. Calibra- tion determines the current slope of the sensor and stores this value in the instrument. When to calibrate? After connecting another D.
  • Page 33 Multi 197i Operation Sensor evaluation After the calibration, the measuring instrument evaluates the current status of the sensor against the relative slope. The evaluation appears on the display. The relative slope has no effect on the measuring accu- racy. Low values indicate that the electrolyte will soon be depleted and the sensor will have to be regenerated.
  • Page 34 Operation Multi 197i mg/l Time Baud 1 7 6 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Press the <RUN/ENTER> key. AutoRead is active, AR flashes. mg/l Time Baud 1 7 6 ° Day.Month Year Ident...

  • Page 35: Entering The Salt Content (Salinity)

    (the measured salinity) of the test sample (range 0.0 - 70.0) and to switch on the salinity correction. Note With the Multi 197i, you can measure the salinity. How to proceed is de- scribed in section 4.5.3 M on page 38.

  • Page 36: Conductivity

    Operation Multi 197i Conductivity 4.5.1 General information Note Conductivity measurements with the Multi 197i can only be carried out using measuring cells with a cell constant between 0.450 cm 0.500 cm (example: TetraCon 325 or TA 197 LF). Warning When connecting an earthed PC/printer, measurements cannot be per- formed in earthed media as incorrect values would result.
  • Page 37 Multi 197i Operation Temperature The nonlinear temperature compensation is set fixed and is shown on compensation the display by nLF. Reference temperature, The reference temperature (Tref) can be switched between 20 °C and Tref 25 °C. It appears on the display as Tref20 or Tref25. To switch over the...

  • Page 38: Measuring The Conductivity

    Operation Multi 197i 4.5.2 Measuring the conductivity You can carry out the conductivity measurements as follows: Perform the preparatory activities according to section 4.5.1 page 36. Immerse the conductivity measuring cell in the test sample. Press the < ▲> <▼> keys until in the status display, and the unit μS/cm appears.

  • Page 39: Autoread Ar (Drift Control) And Hold Function

    Multi 197i Operation 4.5.4 AutoRead AR (Drift control) and hold function The AutoRead function (drift control) checks the stability of the mea- surement signal. The stability has a considerable impact on the repro- ducibility of the measured values. With the aid of the hold function the measured value display is frozen.

  • Page 40: Determining The Cell Constant (Calibration In The Control Standard)

    Operation Multi 197i 4.5.5 Determining the cell constant (Calibration in the control standard) Why determine the cell Aging slightly changes the cell constant, e. g. by coatings. As a result, constant? an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell.
  • Page 41 Multi 197i Operation Calibration evaluation After the calibration, the measuring instrument automatically evaluates the current status of the calibration. The evaluation appears on the dis- play. Display Cell constant [cm 0.450 ... 0.500 cm Outside the range 0.450 ... 0.500 cm...
  • Page 42 Operation Multi 197i mg/l Time Baud 4 7 3 ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng To return to the measuring mode: Press the <M> key. The de- termined cell constant is taken over for the measurement.

  • Page 43: Calibration Intervals (Int 3, Int 4, Int 5)

    Multi 197i Operation Calibration intervals (Int 3, Int 4, Int 5) For each measured variable, a time interval is stored. When it has ex- pired, you will be reminded to calibrate. After a calibration interval has expired, the sensor symbol of the relevant measured variable flashes.

  • Page 44: Saving Data

    Operation Multi 197i Saving data The portable Multi 197i multiparameter measuring instrument has an internal data storage. It can store up to 500 datasets. A complete data record consists of: Number of the storage location Date/time Measured values of the connected and active sensors...
  • Page 45 Multi 197i Operation mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Using <▲> <▼>, enter the required ID number (1 ... 999). Confirm with <RUN/ENTER>. The measured values are stored. The instrument changes to the measuring mode.

  • Page 46: Switching On Autostore (Int 1)

    Operation Multi 197i 4.7.2 Switching on AutoStore (Int 1) The save interval (Int 1) determines the chronological interval between automatic save processes. After the fixed interval has expired, the cur- rent data record is transmitted to the internal storage and to the inter- face.
  • Page 47 Multi 197i Operation mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Set the required ID number with <▲> <▼>. Confirm with <RUN/ENTER>. The measuring instrument switches to the last active measur- ing mode and start the measuring and saving procedure. Au- toStore flashes on the display.

  • Page 48: Outputting The Data Storage

    Operation Multi 197i 4.7.3 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 49 Multi 197i Operation Note If you want to search for a certain element of the data record (e.g. date), proceed as follows: Using <RUN/ENTER>, select the element (e.g. date). Press <▲> or <▼> repeatedly until the required element ap- pears on the display.
  • Page 50 Operation Multi 197i Sample printout: 09.03.02 17:10 pH 10.01 °C Tauto Ident : 09.03.02 17:12 305 mV Tauto Ident : 09.03.02 17:24 7.88 mg/l 17.6° Tauto Ident : 09.03.02 17:46 7.11 mg/l 17.8° Tauto SAL = 17.9 Ident : 10.03.02 19:09 2.40 mS/cm...
  • Page 51 Multi 197i Operation Press the <RUN/ENTER> key. The data of the last calibration of all measured variables ap- pears in the following sequence: pH: Slope SLO and asymmetry ASY Oxygen: Relative slope SLO Cond: Cell constant C Information concerning the calibration procedure is output as well.
  • Page 52 Operation Multi 197i Press <RUN/ENTER> to display the cell constant. The dis- played value is: the current, calibrated cell constant (with sensor symbol on the display) or the fixed cell constant 0.475 1/cm (without sensor symbol on the display). In this case, the measuring parameters are initialized (see section 4.10 R...
  • Page 53 Multi 197i Operation Outputting the calibra- Press the <RCL> key repeatedly until CAL SEr appears on the tion protocol on the display. 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 54: Clearing The Memory

    Operation Multi 197i 4.7.4 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 last active measuring mode.

  • Page 55: Transmitting Data

    Multi 197i Operation Transmitting data You have the following possibilities of transmitting data: One of the following options: – With the AutoStore function (page 46), the measured values of all connected and active sensors are stored periodically and output to the interface (save interval Int 1).
  • Page 56 Operation Multi 197i Confirm with <RUN/ENTER>. The measuring instrument switches to the last active measur- ing mode. Note When the AutoStore function is active at the same time, the data trans- mission is performed according to the setting of the save interval (Int 1).

  • Page 57: Pc/External Printer (Rs232 Interface)

    Multi 197i Operation 4.8.2 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 58: Configuration

    Operation Multi 197i 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 Air pressure display...
  • Page 59 Multi 197i Operation Display during the pH 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 <▲> <▼>. mV: Display of the current electrode voltage /pH: Display of the buffer nominal value.
  • Page 60 Operation Multi 197i Dissolved oxygen calibration interval mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Set the required interval in days (d) with <▲> <▼>. Confirm with <RUN/ENTER>. Int 5 and the measured variable appears on the display.
  • Page 61 Multi 197i Operation Date and time 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 <▲> <▼>. Confirm with <RUN/ENTER>. The date (month) flashes in the display.

  • Page 62: Reset

    Operation Multi 197i 4.10 Reset You can reset (initialize) the measurement parameters and the config- uration parameters separately from one another. Measurement The following measurement parameters (pH/O InI) can be reset to parameters the delivery status: Measuring mode Asymmetry 0 mV Slope -59.16 mV...
  • Page 63 Multi 197i Operation Resetting the Press the <RUN/ENTER> key and hold it down. measuring parameters Press the <CAL> key. The setting to reset the pH measuring parameters appears on the display. mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20...
  • Page 64 Operation Multi 197i mg/l Time Baud ° Day.Month Year Ident Tref25 Tref20 Auto Store REL1 REL2 LoBat ARng Using <▲> <▼>, switch between no and YES. YES: Resetting the Cond measuring parameters. no: Retaining settings. Confirm with <RUN/ENTER>. The measuring instrument switches to the configuration pa- rameters.

  • Page 65: Maintenance, Cleaning, Disposal

    Multi 197i 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 (polyure- thane, ABS and PMMA).
  • Page 66 Maintenance, cleaning, disposal Multi 197i Measuring instrument Dispose of the measuring instrument without the rechargeable battery as electronic waste at an appropriate collection point. ba75339e04 07/2009...

  • Page 67: What To Do If

    Multi 197i What to do if... What to do if... pH system messages 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 68 What to do if... Multi 197i 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 69: Oxi System Messages

    Multi 197i What to do if... Oxi system messages Error message 0FL Cause Remedy Display range exceeded Oxygen sensor – Not connected – Connect the sensor – Cable broken – Replace sensor – Depleted – Replace sensor – Short-circuit between gold and –...

  • Page 70: Conductivity System Messages

    What to do if... Multi 197i Measured value too low Cause Remedy – Insufficient flow – Provide flow to the sensor Measured value too Cause Remedy high – High amount of dissolved – Correct solubility function substances using the salinity equivalent –...

  • Page 71: General Errors

    – Output data storage and clear data storage 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 72 What to do if... Multi 197i ba75339e04 07/2009...

  • Page 73: Technical Data

    Multi 197i Technical data Technical data General data 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 Test certificates Ambient conditions Storage - 25 °C ...

  • Page 74: Measuring Ranges, Resolutions, Accuracies

    Technical data Multi 197i Serial Connection of the cable AK 340/B or AK 325/S interface Baud rate adjustable: 1200, 2400, 4800, 9600 Baud Type RS232, data output Data bits Stop bits Parity None Handshake RTS/CTS + Xon/Xoff Cable length Max. 15m...

  • Page 75: Dissolved Oxygen

    Multi 197i Technical data 7.2.2 Dissolved oxygen Measuring ranges Variable Measuring range Resolution and resolutions Concentration [mg/l] 0 ... 19.99 0.01 0 ... 90.0 Saturation [%] 0 ... 199.9 0 ... 600 T [°C] 0 ... 50.0 Accuracies Variable Accuracy (± 1 Digit) Concentration [mg/l] ±...

  • Page 76: Conductivity

    Technical data Multi 197i 7.2.3 Conductivity Measuring ranges Variable Measuring range Resolution and resolutions [µS/cm] 0 ... 1999 [mS/cm] 0.00 ... 19.99 0.01 0.0 ... 199.9 0 ... 500 0.0 ... 70.0 according to the IOT table − 5.0 ... + 105.0 T [°C]...

  • Page 77: Lists

    Multi 197i 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 78 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 Cell constant [cm ] (internat. k) °C Temperature unit, degrees Celsius Calibration Cd...
  • Page 79 Multi 197i Lists Nonlinear temperature compensation Display range exceeded (Overflow) OxiCal Automatic calibration for D. O. measurements pH value Slope (internat. k) Salinity SELV Safety Extra Low Voltage Slope setting on calibration Temperature coefficient (internat. α) Temperature measurement active (temperature...
  • Page 80 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 81 The asymmetry is part of the offset potential. ® OxiCal WTW name for a procedure to calibrate D. O. measuring systems in water vapor saturated air. Oxygen saturation Short name for the relative D. O. saturation.
  • Page 82 The slope of a linear calibration function. Slope (relative) Designation used by WTW in the D. O. 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 83 Multi 197i Index Air pressure display Conductivity Asymmetry Oxygen pH calibration evaluation Authorized use pH value 21, 24 AutoCal TEC Plug-in power supply AutoRead Precautions Conductivity Energy saving feature Criteria 69, 70 Error messages Oxygen Reference temperature (con- ductivity) Remote control...
  • Page 84 Index Multi 197i Two-point calibration Two-point calibration (pH) 21, 25 ba75339e04 07/2009...

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