wtw pH/Cond 340i Operating Manual
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wtw pH/Cond 340i Operating Manual

Ph/conductivity measuring instrument
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Operating manual
pH/Cond 340i
pH/Conductivity measuring instrument
ba52312e02
03/2004

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  • Page 1 Operating manual pH/Cond 340i pH/Conductivity measuring instrument ba52312e02 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/Cond 340i Maintenance, cleaning, disposal ....65 Maintenance ........65 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/Cond 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/Cond 340i measuring instrument Beaker, 50 ml Stand Calibration and control standard for conductivity measuring cells, 50 ml 50 ml pH buffer solution, STP 4 50 ml pH buffer solution, STP 7 Storing solution for pH electrodes...

  • Page 8: Keypad

    Overview pH/Cond 340i Keypad RUN/ENTER Key functions Select the measured variable <M>: – pH value / ORP voltage – Conductivity / salinity Save a measured value <STO> Switch measuring instrument on/off <ON/OFF> Calibrate the currently set measured variable <CAL> Display/transmit measured values <RCL>...

  • Page 9: Display

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

  • Page 10: Operating Structure

    Overview pH/Cond 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 conductivity measuring cell with temperature sen- sor, the measuring instrument recognizes the probe and automatically switches to the last selected conductivity measuring mode.

  • 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/Cond 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/Cond 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 conductivity measuring ments cell. The measuring instrument recognizes which sensors are connect- ed and automatically switches to the correct mode for the temperature measurement.

  • Page 18: Measuring The Ph Value

    Operation pH/Cond 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/Cond 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/Cond 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/Cond 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/Cond 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/Cond 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/Cond 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 conductivity measuring cell.
  • 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/Cond 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: Conductivity/Salinity

    340i Operation Conductivity/Salinity 4.4.1 General information Note Conductivity measurements with the pH/Cond 340 can only be carried out using the TetraCon 325 measuring cell. Warning When connecting an earthed PC/printer, measurements cannot be per- formed in earthed media as incorrect values would result.
  • Page 34 Operation pH/Cond 340i Checking the cell con- Press the <RCL> key repeatedly until CAL disp appears on the stant display. mV/pH % mg/l mbar Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Press the <RUN/ENTER>...

  • Page 35: Measuring The Conductivity

    340i Operation 4.4.2 Measuring the conductivity You can meaure the conductivity as follows: Perform the preparatory activities according to section 4.4.1. Immerse the conductivity measuring cell in the test sample. and the unit µ S/cm appears Press the <...

  • Page 36: Autoread Ar (Drift Control)

    Operation pH/Cond 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 effect on the repro- ducibility of the measured value. Select the or SAL measuring mode with <M> and/or <...

  • Page 37: Determining The Cell Constant (Calibration In The Control Standard)

    340i Operation 4.4.5 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 38 Operation pH/Cond 340i 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 39 340i Operation Press the <RUN/ENTER> key. The AutoRead measurement to determine the cell constant starts. The AR display indicator flashes until a stable signal is reached. The cell constant determined is displayed. The mea- suring instrument automatically stores the cell constant.

  • Page 40: Setting The Temperature Compensation

    Operation pH/Cond 340i 4.4.6 Setting the temperature compensation The calculation of the temperature compensation is based on the pre- set reference temperature, Tref 20 or Tref 25 (see section 4.8 C ONFIGURATION You can select one of the following temperature compensations:...
  • Page 41 340i Operation Selecting the nonlinear You can select the nonlinear temperature compensation as follows: temperature compensa- tion Press the <CAL> key repeatedly until the status displays and tC appear. Press the <RUN/ENTER> key. Press the <CAL> key repeatedly until nLF appears on the dis- play.
  • Page 42 Operation pH/Cond 340i Press the <RUN/ENTER> key. Press the <CAL> key repeatedly until the adjustable linear temperature coefficient (%/K) appears on the display. mV/pH % mg/l mbar Baud Time ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store...
  • Page 43 340i Operation Switching the tempera- You can switch off the temperature compensation as follows: ture compensation off Press the <CAL> key repeatedly until tc appears on the dis- play. Press the <RUN/ENTER> key. Press the <CAL> key repeatedly until four bars appear in the lower line of the display.

  • Page 44: Calibration Intervals (Int 3, Int 5)

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

  • Page 45: Saving

    340i Operation 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 46 Operation pH/Cond 340i 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 47: Switching On Autostore (Int 1)

    340i Operation 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 48 Operation pH/Cond 340i 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 49: Outputting The Data Storage

    340i Operation 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 50 Operation pH/Cond 340i 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 51 340i Operation 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 52 Operation pH/Cond 340i mV/pH mg/l mbar Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Press <RUN/ENTER> to display the value of the asymmetry (mV). mg/l mbar Time Baud ° Day.Month °...
  • Page 53 340i Operation 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 54: Clearing The Memory

    Operation pH/Cond 340i 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 55: Transmitting Data

    340i Operation Transmitting data You have the following possibilities of transmitting data: l One of the following options: – With the AutoStore function (page 47), measured values are periodically saved internally (save interval Int 1) and output on the interface.

  • Page 56: Pc/External Printer (Rs232 Interface)

    Operation pH/Cond 340i 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: Remote Control

    340i Operation 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 58: Configuration

    Operation pH/Cond 340i 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 59 340i Operation 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 60 Operation pH/Cond 340i Confirm with <RUN/ENTER>. The reference temperature set for conductivity measurements appears on the display. Switching over the TDS UpH mV/pH reference temperature % mg/l mbar M cm Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20...
  • Page 61 340i Operation Confirm with <RUN/ENTER>. The minutes flash on the display. Set the current time with < > < >. Confirm with <RUN/ENTER>. The measuring instrument switches to the last active measur- ing mode.

  • Page 62: Reset

    Operation pH/Cond 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 63 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 64 Operation pH/Cond 340i Resetting the configuration parame- ters mV/pH % 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 65: 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 66: Cleaning

    Maintenance, cleaning, disposal pH/Cond 340i Note For maintenance of electrodes and measuring cells, follow the corre- sponding 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.

  • Page 67: 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 68 What to do if... pH/Cond 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 69: Conductivity System Messages

    340i What to do if... Conductivity system messages Error message OFL Cause Remedy The measured value lies outside the measuring range – Measuring cell not connected – Connect measuring cell – Cable broken – Replace measuring cell Error message E3...
  • Page 70 What to do if... pH/Cond 340i Message StoFull StoFull StoFull StoFull Cause Remedy – All memory locations are full – Output data storage and clear data storage...

  • Page 71: 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 72 Technical data pH/Cond 340i Cond measuring ranges Measuring range Resolution [µS/cm] 0 ... 1999 [mS/cm] 0.00 ... 19.99 0.01 0.0 ... 199.9 0 ... 500 0.0 ... 70.0 accord- ing to the IOT table − 5.0 ... + 105.0 T [°C]...
  • Page 73 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 74 Technical data pH/Cond 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 75: 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 76 AutoRead (drift control) 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 Cell constant [cm ] (internat. k) °C Temperature unit, degrees Celsius Calibration Cm...
  • Page 77 340i Lists SELV Safety Extra Low Voltage Slope setting on calibration Temperature coefficient (internat. α ) Temperature measurement active (Temperature Probe) 20/T20 Reference temperature of 20 °C 25/T25 Reference temperature of 25 °C Asymmetry...
  • Page 78 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 79 Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol- vent. ® MultiCal WTW name stating that a measuring instrument provides several cal- ibration procedures. Offset potential The measurable potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point.
  • Page 80 Lists pH/Cond 340i Temperature Value of the slope of a linear temperature function. coefficient Temperature Name of a function that considers the temperature influence on the compensation measurement and converts it accordingly. Depending on the mea- sured parameter to be determined, the temperature compensation functions in different ways.
  • Page 81 340i Index Asymmetry Auslieferzustand Kalibrieren Safety Authorized use Keys safety precautions 21, 27 AutoCal DIN Salinity 21, 23 AutoCal TEC Save interval 18, 36 AutoRead Scope of delivery Linear Setting the baud rate Temperature compensa- 13, 60 Setting the date...
  • Page 82 Index pH/Cond 340i...

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