wtw pH/Oxi 340i Operating Manual
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wtw pH/Oxi 340i Operating Manual

Ph/oxygen measuring instrument
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Operating manual
pH/Oxi 340i
pH/Oxygen measuring instrument
ba52314e02
03/2004

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  • Page 1 Operating manual pH/Oxi 340i pH/Oxygen measuring instrument ba52314e02 03/2004...
  • Page 2 © Copyright Weilheim 2004, WTW GmbH Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim. Printed in Germany.

  • Page 3: Table Of Contents

    340i Contents Overview ........5 General features .
  • Page 4 Contents pH/Oxi 340i Maintenance, cleaning, disposal ....61 Maintenance ........61 Cleaning .

  • Page 5: Overview

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

  • Page 6: Sets Of Equipment

    Overview pH/Oxi 340i SETs of equipment The measuring instrument is also available as part of individual SETs of equipment. You will find additional information on this and other accessories in the WTW catalog or via the Internet.
  • Page 7 340i Overview Set (sample configuration): pH/Oxi 340i measuring instrument 50 ml ELY/G electrolyte solution for D.O. probes Stand RL/G cleaning solution for D.O. probes, 50 ml 50 ml pH buffer solution, STP 4 50 ml pH buffer solution, STP 7 Storing solution for pH electrodes CellOx 325 D.O.

  • Page 8: Keypad

    Overview pH/Oxi 340i Keypad RUN/ENTER Key functions Select the measured variable <M>: – pH value / ORP voltage – D. O. concentration/saturation/partial pressure Save a measured value <STO> Switch measuring instrument on/off <ON/OFF> Calibrate the currently set measured variable <CAL>...

  • Page 9: Display

    340i Overview Display Status display Probe symbol mV/pH % mg/l Meas. value display mbar 1/ cm Time Baud Function and ° Day.Month No. ° Year Ident temperature display Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCalTEC Jack field D.

  • Page 10: Operating Structure

    Overview pH/Oxi 340i 1.6 Operating structure The following overview diagram shows which keys you have to press to select between the different measuring modes: Note When connecting a D. O.probe with temperature sensor, the measur- ing instrument recognizes the probe and automatically switches to the last selected D.

  • Page 11: Safety

    340i 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 12: General Safety Instructions

    Safety pH/Oxi 340i 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 13: Commissioning

    340i Commissioning Commissioning Scope of delivery l 340i handheld meter l Plug-in power supply (optional) l Operating manual and short operating manual l 4 batteries, 1.5 V Mignon type AA (in the instrument) For details of scope of delivery of SETs, see chapter 1.2 SET S OF and WTW catalog.
  • Page 14 Warning Use original plug-in power supplies only (see chapter 7 T ECHNICAL DATA Plug the jack (1) into the socket (2) of the measuring instru- ment. Connect the original WTW plug-in power supply (3) to an easily accessible mains socket.

  • Page 15: Operation

    340i Operation Operation Switching on the measuring instrument Press the <ON/OFF> key. The display test appears briefly on the display. After this, the measuring instrument automatically switches to the measuring mode. Measuring mode when Connected sensor Measuring mode switching on...

  • Page 16: Ph Value / Orp Voltage

    Operation pH/Oxi 340i pH value / ORP voltage 4.2.1 General information Preparatory activities Perform the following preparatory activities when you want to measure: Connect the pH electrode to the measuring instrument. If necessary, press the <M> key repeatedly until the status dis- play pH (pH measurement) or U (measurement of the ORP voltage) appears.
  • Page 17 340i Operation 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 a D. O. probe. The mea- ments suring instrument recognizes which sensors are connected and automatically switches to the correct mode for the temperature mea- surement.

  • Page 18: Measuring The Ph Value

    Operation pH/Oxi 340i 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 < > < > keys until pH appears in the status display. The pH value appears on the display.
  • Page 19 340i Operation 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>. To terminate the AutoRead function: Press the <AR> key.

  • Page 20: Measuring The Orp Voltage

    Operation pH/Oxi 340i 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 (mV) of a solution. Perform the preparatory activities according to section 4.2.1. Submerse the ORP electrode in the sample.

  • Page 21: Ph Calibration

    You can select one of 3 calibration procedures: 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 4.8 C...
  • Page 22 Operation pH/Oxi 340i Note You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.7.2 before calibrating. After a valid calibration, the record is printed. Sample printout: CALIBRATION PROTOCOL 02.03.01...

  • Page 23: Autocal Tec

    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 24 Operation pH/Oxi 340i % mg/l mbar 1/ cm Sal Baud Time ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC If required, enter the temperature of the first buffer solution with < > < > while keeping the <RUN/ENTER> key depressed.
  • Page 25 340i Operation strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines the asymmetry of the electrode. Thoroughly rinse the electrode with deionized water. If required, enter the temperature of the second buffer solution with < > < > while keeping the <RUN/ENTER> key de- pressed.
  • Page 26 Operation pH/Oxi 340i mg/l mbar Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store LoBat ARng Lin Cal AutoCal TEC Switch to the measuring mode with <M>.

  • Page 27: Autocal Din

    340i Operation 4.3.2 AutoCal DIN For this procedure, use two different standard buffer solutions accord- ing to DIN 19266 (type A, C, D or F with pH values at 25 °C of: 1.679 / 4.006 / 6.865 / 9.180).
  • Page 28 Operation pH/Oxi 340i When the measured value is stable, Cd2 appears. % mg/l mbar 1/ cm Sal Time Baud ° Day.Month No. ° Year Ident Tref20 Auto Store Tref25 AutoCal DIN LoBat ARng AutoCal TEC Note At this point, the AutoCal DIN calibration can be terminated with <M>.
  • Page 29 340i Operation When the measured value is stable, AR disappears. The value of the slope (mV/pH) appears on the display. The probe symbol shows the evaluation of the current calibration. mV/pH mg/l mbar Time Baud ° Day.Month ° Year...

  • Page 30: Concal

    Operation pH/Oxi 340i 4.3.3 ConCal Two-point calibration For this procedure, use two buffer solutions: l pH 7.0 ± 0.5 l any other buffer solution Note Skip the steps 2 and 8 if you use a pH electrode with a temperature sensor or the temperature sensor of a D.
  • Page 31 340i Operation mV/pH % mg/l mbar 1/ cm Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Thoroughly rinse the electrode with deionized water. If required, enter the temperature of the second buffer solution with <...
  • Page 32 Operation pH/Oxi 340i mg/l mbar Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Switch to the measuring mode with <M>.

  • Page 33: Dissolved Oxygen

    You can measure the following variables: l D. O. concentration l D. O. saturation The pH/Oxi 340i handheld meter is equipped with the following func- tions: l AutoRange (automatic measurement range selection), l The AutoRead function (drift control) for checking the stability of the measurement signal.

  • Page 34: Measuring The D. O. Concentration

    Operation pH/Oxi 340i Temperature sensor The D. O. probe has an integrated temperature sensor that always measures the current temperature of the test sample. 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.

  • Page 35: Measuring The D. O. Saturation

    340i Operation TDS UpH mV/pH mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store LoBat ARng AutoCal TEC While pressing the <RUN/ENTER> key, switch off the salt con- tent correction with < >. The SAL display indicator is no longer displayed.

  • Page 36: Autoread Ar (Drift Control)

    Operation pH/Oxi 340i 4.4.4 AutoRead AR (Drift control) 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. Call up the measuring mode with <M> and/or < > < > .

  • Page 37: Calibration

    340i Operation 4.4.5 D. O. calibration Why calibrate? D. O. probes age. This changes the slope of the D. O. probe. Calibra- tion determines the current slope of the probe and stores this value in the instrument. l After connecting another D. O. probe...
  • Page 38 Operation pH/Oxi 340i Sample printout: CALIBRATION PROTOCOL 02.03.01 14:19 Device No.: 12345678 CALIBRATION 02 Cal time: 02.03.01 / 14:19 Cal interval: OxiCal Tauto AR Relative Slope: 0,88 Probe: Probe evaluation After the calibration, the measuring instrument evaluates the current status of the probe against the relative slope. The evaluation appears on the display.
  • Page 39 340i Operation Put the D. O. probe into the air calibration vessel. Press the <CAL> key repeatedly until the calibration mode ap- pears. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameter has been reset).

  • Page 40: Entering The Salt Content (Salinity)

    Operation pH/Oxi 340i Note In chapter 6 W ... from page 63, you will find the measures HAT TO DO IF to take for error elimination. 4.4.6 Entering the salt content (salinity) A salt content correction is required in the oxygen concentration mea- surement of test samples with a salt content of more than 1 g/l.

  • Page 41: Calibration Intervals (Int 3, Int 4)

    340i Operation Calibration intervals (Int 3, Int 4) 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 probe symbol of the relevant measured variable flashes. It is still possible to measure.

  • Page 42: Saving

    Operation pH/Oxi 340i Saving The measuring instrument has an internal data memory. It can store up to 500 data records. A complete data record consists of: l Number of the storage location l Date/time l Measured values of the probes connected...
  • Page 43 340i Operation mV/pH mg/l mbar 1/ cm Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Using < > < >, set the required ID number (1 ... 999). Confirm with <RUN/ENTER>.

  • Page 44: Switching On Autostore (Int 1)

    Operation pH/Oxi 340i 4.6.2 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 45 340i Operation mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Set the required ID number with < > < >. Confirm with <RUN/ENTER>. The measuring instrument switches to the last active measur- ing mode and starts the measuring and saving procedure.

  • Page 46: Outputting The Data Storage

    Operation pH/Oxi 340i 4.6.3 Outputting the data storage You can output the contents of the data storage: l Stored data on the display l Calibration data on the display l Stored data on the serial interface l Calibration protocol to the interface Outputting stored data Press the <RCL>...
  • Page 47 340i 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 48 Operation pH/Oxi 340i Sample printout: 09.03.99 17:10 pH 10.01 °C Tman Ident : 09.03.99 17:11 pH 10.01 24.7 °C Tauto Ident : 09.03.99 17:12 305.2 mV Tauto Ident : Outputting the Press the <RCL> key repeatedly until CAL disp appears on the calibration data display.
  • Page 49 340i Operation Press <RUN/ENTER> to display the value of the asymmetry (mV). mg/l mbar Time Baud ° Day.Month ° Year Ident Tref20 AutoCal DIN Auto Store Tref25 ARng LoBat Lin Cal AutoCal TEC Press <RUN/ENTER> to display the relative slope of the D. O.
  • Page 50 Operation pH/Oxi 340i Outputting the calibra- Press the <RCL> key repeatedly until CAL SEr appears on the tion protocol on the display. interface mV/pH % mg/l C A L mbar Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20...

  • Page 51: Clearing The Memory

    340i Operation 4.6.4 Clearing the memory With this function, you can delete stored data records. 500 storage lo- cations will then be available again. Note The Clear memory function only appears when there are data records stored in the memory. Otherwise, the measuring instrument automati- cally switches to the last active measuring mode.

  • Page 52: Transmitting Data

    Operation pH/Oxi 340i Transmitting data You have the following possibilities of transmitting data: l One of the following options: – With the AutoStore function (page 44), measured values are periodically saved internally (save interval Int 1) and output on the interface.

  • Page 53: Pc/External Printer (Rs232 Interface)

    340i Operation 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 54: Remote Control

    Operation pH/Oxi 340i 4.7.3 Remote control The measuring instrument can be remotely controlled from a PC. This requires the KOM pilot communication kit. It is available as an acces- sory. The instrument is then controlled via commands that simulate keystrokes and request the current display contents.

  • Page 55: Configuration

    340i 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 56 Operation pH/Oxi 340i mV/pH % mg/l C A L mbar Time Baud ° Day.Month No. ° Year Ident Tref20 Auto Store Tref25 AutoCal DIN LoBat ARng AutoCal TEC Select the required display during the pH calibration with < > < >.
  • Page 57 340i Operation TDS UpH mV/pH mg/l mbar 1/ cm Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Set the required interval (in days) with < > < >. Confirm with <RUN/ENTER>. The date flashes on the display.

  • Page 58: Reset

    Operation pH/Oxi 340i Reset You can reset (initialize) the measurement parameters and the config- uration parameters separately from one another. Measurement The following measuring parameters are reset to the delivery status: parameters Measuring mode Slope -59.16 mV/pH Asymmetry 0 mV Manual temperature input 25 °C...
  • Page 59 340i 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. mV/pH % mg/l mbar Baud Time ° Day.Month No.
  • Page 60 Operation pH/Oxi 340i Resetting the configuration parame- mV/pH ters % mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Using < > < >, toggle between no and YES.

  • Page 61: Maintenance, Cleaning, Disposal

    340i Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The measuring instrument is almost maintenance-free. The only maintenance task is replacing the batteries. LoBat on the display indicates that the batteries should be changed. The batteries are then largely depleted.

  • Page 62: Cleaning

    Maintenance, cleaning, disposal pH/Oxi 340i Note For maintenance of electrodes and sensors, follow the corresponding operating manual. 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 is made of a synthetic material (ABS).

  • Page 63: What To Do If

    340i 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 64 What to do if... pH/Oxi 340i 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 65: Oxi System Messages

    340i What to do if... Oxi system messages Error message 0FL Cause Remedy Display range exceeded D. O. probe: – Not connected – Connect the probe – Cable broken – Replace probe – Depleted – Replace probe – Short-circuit between gold and –...

  • Page 66: General Errors

    What to do if... pH/Oxi 340i Measured value too low Cause Remedy – Insufficient flow – Provide flow to the probe Measured value too Cause Remedy high – High amount of dissolved – Correct solubility function substances using the salinity equivalent –...

  • Page 67: Technical Data

    340i Technical data Technical data Dimensions and weight Length [mm] Width [mm] Height [mm] Weight [kg] Approx. 0.3 Mechanical structure Type of protection IP 66 Electrical safety Protective class Ambient conditions Storage - 25 °C ... + 65 °C Operation -10 °C ...
  • Page 68 Technical data pH/Oxi 340i Oxi measuring ranges mg/l °C Measuring range I 0 ... 19.99 0 ... 199.9 Resolution 0.01 Measuring range II 0 ... 90.0 0 ... 600 Resolution Temperature - 5,0 ... + 105.0 resolution Precision of Concentration ±...
  • Page 69 340i Technical data Serial interface Type RS232, data output Baud rate Selectable 1200, 2400, 4800, 9600 baud Data bits Stop bit Parity None Handshake RTS/CTS + Xon/Xoff Cable length Max. 15m Power supply Batteries 4 x 1.5 V alkali-manganese batteries, type Operational life Approx.
  • Page 70 Technical data pH/Oxi 340i Guidelines E.C. guideline 89/336/EEC and norms used EN 61326-1:1997 EN 61000-3-2 A14:2000 EN 61000-3-3:1995 FCC Class A Instrument safety E.C. guideline 73/23/EEC EN 61010-1 A2:1995 Climatic class VDI/VDE 3540 Type of protection EN 60529:1991 FCC Class A Equipment Statement...

  • Page 71: Lists

    340i 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 72 ARng Automatic range switching Measuring instrument measures with highest reso- lution Asymmetry AutoCal TEC Automatic pH calibration with WTW technical buff- er solutions according to DIN 19267 °C Temperature unit, degrees Celsius Calibration Cm... Display indicator during calibration for pH mea- surements.
  • Page 73 340i Lists Temperature measurement active (Temperature Probe) Asymmetry...
  • Page 74 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 75 (e. g. a gold or platinum surface). ® OxiCal WTW name for a procedure to calibrate D. O. measuring systems in water vapor saturated air. pH value The pH is a measure of the acidic or basic effect of an aqueous solu- tion.
  • Page 76 Lists pH/Oxi 340i 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 probe of the same type of construction. Standard solution The standard solution is a solution where the measured value is known by definition.
  • Page 77 340i Index Asymmetry Auslieferzustand Measuring mode when Temperature sensor Authorized use switching on 21, 27 AutoCal DIN Measuring the D. O. concen- Two-point calibration 21, 23 AutoCal TEC tration ConCal AutoRead Measuring the D. O. satura- two-point calibration D. O.
  • Page 78 Index pH/Oxi 340i...

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