inoLab Cond 730 - Fagerberg

fagerberg.dk

inoLab Cond 730 - Fagerberg

Operating manualba75445einoLabCond 730Cond 730Laboratory conductivity meterba75445e02 06/2004


Accuracy whengoing to pressThe use of advanced technology and the high qualitystandard of our instruments are the result of continuousdevelopment. This may result in differences between thisoperating manual and your instrument.We cannot guarantee that there are absolutely no errors inthis manual. We are sure you will understand that we cannotaccept any legal claims resulting from the data, figures ordescriptions.WarrantydeclarationThe designated instrument is covered by a warranty of threeyears from the date of purchase.The instrument warranty extends to manufacturing faultsthat are determined within the period of warranty.The warranty excludes components that are replaced duringmaintenance such as batteries, etc.The warranty claim extends to restoring the instrument toreadiness for use but not, however, to any further claim fordamages. Improper handling or unauthorized opening of theinstrument invalidates any warranty claim.To ascertain the warranty liability, return the instrument andproof of purchase together with the date of purchase freightpaid or prepaid.Copyright© Weilheim 2004, WTW GmbHReprinting - even as excerpts - is only allowed with theexplicit written authorization of WTW GmbH, Weilheim.Printed in Germany.


Cond 730Contents1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.3 Sockets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . 102.2 General safety instructions. . . . . . . . . . . . . . . . 103 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 133.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . 133.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . 134 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174.1 Switch on the instrument . . . . . . . . . . . . . . . . . 174.2 Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194.2.1 Conductivity / Specific resistance . . . . . 214.2.2 Salinity. . . . . . . . . . . . . . . . . . . . . . . . . . 224.2.3 TDS (total dissolved solids). . . . . . . . . . 234.2.4 Printing/transmitting measured values . 244.3 Determining/setting up the cell constant [C]. . . 254.3.1 Determining the cell constant(calibrating) . . . . . . . . . . . . . . . . . . . 254.3.2 Setting the cell constant manually. . . . . 294.4 Setting up the temperature compensation TC . 324.5 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.5.1 Manual storage . . . . . . . . . . . . . . . . . . . 364.5.2 Switching on AutoStore (Int 1). . . . . . . . 384.5.3 Outputting the data storage. . . . . . . . . . 404.5.4 Clearing the storage . . . . . . . . . . . . . . . 464.6 Data transmission. . . . . . . . . . . . . . . . . . . . . . . 474.6.1 Data transmission interval (Int 2). . . . . . 474.6.2 Recorder (analog output) . . . . . . . . . . . 494.6.3 PC/external printer (RS232 interface) . . 504.6.4 Operation with MultiLab pilot . . . . . . . . . 514.7 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 524.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 573


Contents Cond 7305 Maintenance, cleaning, disposal. . . . . . . . . . . 595.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . 595.1.1 Changing the batteries . . . . . . . . . . . . . 605.1.2 Replacing the roll of printer paper . . . . 615.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 626 What to do if.... . . . . . . . . . . . . . . . . . . . . . . . . . 637 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . 678 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 734


Cond 730Overview1 OverviewThe compact inoLab Cond 730 precision conductivity meterlets you perform conductivity measurements rapidly and reliably.The inoLab Cond 730 provides the highest degree of operatingcomfort, reliability and measuring safety for all applications.The integrated printer* enables the measurements to bedocumented in compliance with GLP.The proven procedures to determine or set up the cell constantsupport your work with the conductivity meter.43Cond 730211 Keypad2 Display3 Sockets4 Printer*NoteThe measuring instrument can also be delivered as part ofa set.Information on this and other accessories is available in theWTW catalog LABORATORY AND FIELD INSTRUMENTATION orvia the Internet.* only on the Cond 730 with integrated printer5


Overview Cond 7301.1 Keyboard121234511109876*1 Select measuring mode2 Set up or determine cell constant;select temperature compensation3 Print LED *Red: printer off (offline) or malfunctionGreen: printer ready for operation (online)4 Printer on/off *5 Paper feed/line feed *(Only with the printer being off -Print LED lights up red)6 Reduce values, scroll7 Confirm inputs, start AutoRead8 Increase values, scroll9 Store measured value10 Activate/deactivate AutoRead function11 Measuring instrument ON/OFF12 Display/transmit measured values* only on the Cond 730 with integrated printer6


Cond 730Overview1.2 DisplayStatus lineSensor symbolMeasured value displayFunction andtemperature display1.3 Sockets321Connectors:1 Conductivity measuring cell2 RS 232 interface/analog output3 Plug-in power supplyCautionOnly connect measuring cells to the instrument that cannotfeed excessive voltages or currents (> SELV and > circuitwith current limiter). Almost all commercial measuring cells- especially WTW measuring cells - meet these requirements.7


Overview Cond 7308


Cond 730Safety2 SafetyThis operating manual contains basic instructions that youmust follow during the commissioning, operation and maintenanceof the instrument. Consequently, all responsiblepersonnel must read this operating manual before workingwith the instrument.The operating manual must always be available within thevicinity of the instrument.Target groupThis measuring instrument was developed for use in the laboratory.Thus, we assume that, as a result of their professional trainingand experience, the operators will know the necessarysafety precautions to take when handling chemicals.Symbols usedCautionindicates instructions that have to be followed to preventdamage to your instrument.Warningindicates instructions that have to be followed to protectyourself and the instrument from dangerous electrical voltage.NoteIndicates notes that draw your attention to special features.NoteIndicates cross-references to other documents, e.g. applicationreports, operating manuals of measuring cells, etc.9


Safety Cond 7302.1 Authorized useThis instrument is authorized exclusively for measuring theconductivity, salinity, temperature and TDS (total dissolvedsolids) in the laboratory.The technical specifications as given in the chapter7TECHNICAL DATA must be observed. Only the operationand running of the measuring instrument according to theinstructions given in this operating manual is authorized.Any other use is considered unauthorized.2.2 General safety instructionsThis instrument is constructed and tested in compliance withthe EN 61010-1 safety regulations for electronic measuringinstruments.It left the factory in a safe and secure technical condition.Function andoperational safetyThe smooth functioning and operational safety of the instrumentcan only be guaranteed if the generally applicablesafety measures and the specific safety instructions in thisoperating manual are followed.The smooth functioning and operational safety of the instrumentcan only be guaranteed under the climatic conditionsspecified in the chapter 7 TECHNICAL DATA.If the instrument was transported from a cold environment toa warm environment, the formation of condensate can leadto the faulty functioning of the instrument. In this event, waituntil the temperature of the instrument reaches room temperaturebefore putting the instrument back into operation.CautionThe instrument is only allowed to be opened by personnelauthorized by WTW.10


Cond 730SafetySafe operationIf safe operation is no longer possible, the instrument mustbe taken out of service and secured against inadvertentoperation.Safe operation is no longer possible if: the instrument has been damaged in transport the instrument has been stored under adverse conditionsfor a lengthy period of time the instrument is visibly damaged the instrument no longer operates as described in thismanualIf you are in doubt contact the supplier of the instrument.Obligations of theoperatorThe operator of this measuring instrument must ensure thatthe following laws and guidelines are observed when usingdangerous substances: EEC directives for protective labor legislation National protective labor legislation Safety regulations Safety datasheets of the chemical manufacturer.11


Safety Cond 73012


Cond 730Commissioning3 Commissioning3.1 Scope of delivery Laboratory measuring instrument, inoLab Cond 730 Plug-in power supply Operating manual and short manual 4 x type AA Mignon 1.5 V batteries3.2 Initial commissioningPerform the following activities: Set the date and time Connect the plug-in power supply (for printer functions).Setting the dateand time1 Press and hold down the m key.2 Press the e key.The display test appears briefly on the display.The measuring instrument then switchesautomatically to the setting of the baud rate.3 Press the g key repeatedly until the date flashes onthe display.4 Set today’s date by pressing 82.5 Confirm with g.The date (month) flashes on the display.6 Set the current month by pressing 82.7 Confirm with g. The year appears on the display.8 Set the current year by pressing 82.9 Confirm with g. The hour field flashes on thedisplay.10 Set the current time by pressing 82.11 Confirm with g.The minutes field flashes on the display.13


Commissioning Cond 73012 Set the current time by pressing 82.13 Confirm with g. The measuring instrument thenswitches to the measuring mode.14 Switch off the instrument by pressing e.Connecting theplug-in powersupplyThe measuring instrument works battery-powered. It can,however, also be supplied by the plug-in power supplywhich is available as an accessory.WarningThe line voltage on site must lie within the input voltagerange of the original plug-in power supply unit (see chapter7TECHNICAL DATA).CautionUse original plug-in power supplies only(see chapter 7 TECHNICAL DATA).2131 Insert the plug (1) into the socket (2) of theconductivity meter.14


Cond 730Commissioning2 Connect the original WTW plug-in power supply (3) toan easily accessible mains socket.NoteYou can also perform measurements without a plug-inpower supply. However, the functions of the integratedprinter can only be used with connected plug-in power supply.15


Commissioning Cond 73016


Cond 730Operation4 Operation4.1 Switch on the instrument1 Place the instrument on a flat surface and protect itagainst intense light and heat.2 Connect the conductivity measuring cell to theinstrument.3 Press the e key.The display test appears briefly on the display.The instrument then switches automatically to thepreviously selected measuring mode.4 Check or determine the cell constant [C]. Theprocedure is described in section 4.3 on page 25.NoteThe instrument has an energy saving feature to avoidunnecessary battery depletion.The energy saving feature switches the instrument off if nokey has been pressed for an hour.The energy saving feature is not active: if the power is supplied by the plug-in power supply if the AutoStore function is active if a PC is connected if the recorder cable is connected if the printer cable is connected(for external printers)17


Operation Cond 730Checking the cellconstant1 Press the c key repeatedly until LF CELL isdisplayed.2 Press the g key. The previously selected cellconstant ist displayed, e. g. 0.475 cm -1 .3 To return to the measuring mode: press the m keywhen the correct cell constant ist displayed.4 If a different cell constant is to be set, proceedaccording to section 4.3 DETERMINING/SETTING UP THECELL CONSTANT [C].18


Cond 730OperationPreparatoryactivities4.2 MeasuringPerform the following activities when you want to measure:1 Connect the measuring cell to the instrument.2 Adjust the temperature of the test solutions ormeasure the current temperature if the measurementis made without a temperature probe.3 Calibrate the instrument with the measuring cell orcheck the cell constant set up.4 Select the measuring mode by pressing m.CautionWhen connecting an earthed PC/printer, measurementscannot be performed in earthed media as incorrect valueswould result.The RS232 interface is not galvanically isolated.Temperature probeMeasurements can be performed with and without a temperatureprobe. A connected temperature probe is indicated byTP on the display.If you want to use a WTW conductivity measuring cell withouta temperature probe, you have to connect it with anadapter (available at WTW).NoteThe conductivity meter automatically recognizes the type ofthe temperature probe used. As a result, you can connectelectrodes with the NTC30 or Pt1000.The temperature measurement is absolutely essential for areproducible conductivity measurement. If the measurementis made without a temperature probe, proceed as follows:1 Determine the current temperature using athermometer.2 Set up the temperature by pressing 82.19


Operation Cond 730AutoRead AR(Drift control)The AutoRead function (drift control) checks the stability ofthe measurement signal. The stability has a considerable effecton the reproducibility of the measured value.1 Call up the measuring mode by pressing m.2 Activate the AutoRead function by pressing a.The current measured value is frozen (Hold function).3 Start the AutoRead function by pressing g.AR flashes on the display until a stable measuredvalue is reached.This measured value is transmitted to the printer/interface.4 If necessary, start the next AutoRead measurementby pressing g.5 To terminate the AutoRead function: Press the akey.NoteThe current AutoRead measurement (with acceptance ofthe current value) can be terminated at any time bypressing g.20


Cond 730Operation4.2.1 Conductivity / Specific resistanceNoteYou can display measured values in the units µS/cm (conductivity)or MΩ·cm (specific resistance). This setting is describedin Abschnitt 4.7 CONFIGURATION.Thus, you can carry out conductivity measurements or measurementsof the specific resistance:1 Perform the preparatory activities according tosection 4.2.2 Immerse the conductivity measuring cell into the testsample.3 Press the m key until appears in the statusdisplay. Depending on the setting, one of thefollowing display indicators appears on the display:ConductivitySpecific resistance4 If necessary, set the temperature by pressing 82(see section 4.2 on page 19).5 Wait for a stable measured value.21


Operation Cond 7304.2.2 SalinityTo measure the salinity, proceed as follows:1 Perform the preparatory activities according tosection 4.2.2 Immerse the conductivity measuring cell into the testsample.3 Press the m key repeatedly until Sal appears in thestatus line.The salinity value of the sample appears on thedisplay.4 If necessary, set the temperature by pressing 82(see section 4.2, page 19).5 Wait for a stable measured value.22


Cond 730Operation4.2.3 TDS (total dissolved solids)To measure the TDS, proceed as follows:1 Perform the preparatory activities according tosection 4.2.2 Immerse the conductivity measuring cell into the testsample.3 When measuring with an integrated temperatureprobe continue with step 4.When measuring without temperature probe:– Determine the temperature of the test sampleusing a thermometer– Press the m key repeatedly until appears inthe status line.Enter the temperature using 82.4 Press the m key repeatedly until TDS appears in thestatus line. The TDS value of the sample appears.5 Set up the TDS factor (0.40 ... 1.00) using 82.6 Wait for a stable measured value.NoteAlso refer to Application Report ... 084 KONDUCTOMETRICALDETERMINATION OF THE TOTAL DISSOLVED SOLIDS (TDS).23


Operation Cond 7304.2.4 Printing/transmitting measured valuesMeasured values (data records) can be: printed on the integrated printer* or transmitted to the interfaceNoteTo print, you must switch on the printer using the Print keyo (Print LED lights up green)*.To transmit to the interface, you must connect the interfacecable. The integrated printer is then switched off automatically.You can print/transmit measured values (data records) in 3ways: Switch on the data transmission (Int 2) (see page 47)– After expiry of the selected interval, the current datarecord is sent to the printer/interface. Switch on AutoStore (Int 1) (see page 38)– After expiry of the selected interval, the current datarecord is sent to the printer/interface and in addition isstored in the data storage of the instrument– AutoStore (Int 1) covers the data transmission interval(Int 2). Press the g keyThis manually prints/transmits the current measured valuesat any time - independently of the selected intervals.NoteIf you connect a recorder (analog output), the output to thedigital interface is switched off.* only on the Cond 730 with integrated printer24


Cond 730OperationWhy determine/setup the cellconstant?4.3 Determining/setting up the cell constant [C]Due to ageing, the cell constant slightly changes. As aresult, an inexact measured value is displayed. Calibrationdetermines the current value of the cell constant and storesthis value in the instrument.Thus, you should calibrate at regular intervals.You can determine the cell constant of the conductivity measuringcell in the range 0.450 ... 0.500 cm -1 or0.800 ... 1.200 cm -1 by calibrating in the control standard orset it up manually in the range 0.250... 2.500 cm -1 or0,090 ... 0,110 cm -1 .Additionally, you can select the fixed cell constant0.010 cm -1 .4.3.1 Determining the cell constant (calibrating)Determining the cellconstant(calibration incontrol standard)Determine the cell constant as follows:1 Press the c key repeatedly until LF CELL appearson the display.2 Press the g key.3 Press the c key repeatedly until the following isdisplayed.25


Operation Cond 7304 Immerse the measuring cell into the 0.01 mol/l KCLcontrol standard.5 Press the g key.– If no temperature probe is connected, enter thecurrent temperature of the solution using 82and confirm with g.– If a temperature probe is connected, the ARmeasurement to determine the cell constant starts.AR flashes until a stable signal is achieved. Thedetermined cell constant ist displayed; the measuringinstrument automatically stores the cell constant.NoteIf error message E3 appears see chapter 6 WHAT TO DO IF...AutoReadDuring calibrating, the AutoRead function is automaticallyactivated. The AR display flashes. The calibration procedureis finished when the AR display stops flashing.26


Cond 730OperationNoteThis method of automatically determining the cell constantby calibrating in the 0.01 mol/l KCL control standard canonly be used for measuring cells with a cell constant in therange 0.450 ... 0.500 cm -1 or 0.800 ... 1.200 cm -1 .CalibrationevaluationAfter calibrating, the instrument automatically evaluates thecurrent condition of the calibration.The evaluation appears on the display.Display Cell constant [cm -1 ]0.450 ... 0.500 cm -10.800 ... 1.200 cm -1E3Perform error eliminationaccording to chapter6WHAT TO DO IF...outside of the ranges0.450 ... 0.500 cm -1or0.800 ... 1.200 cm -1Calibration protocolThe calibration protocol contains the calibration data of thecurrent calibration. You can call up the calibration protocolby outputting the data storage (section 4.5.3).NoteYou can automatically print out a calibration protocol afterthe calibration. To do so, switch on the printer (Print LEDlights up green) before calibrating*. After a valid calibration,the protocol is printed.CALIBRATION PROTOCOL14.04.99 11:37Device No.: 99990000CALIBRATION CONDUCTIVITYCal Time: 14.04.99 / 11:37Cal Interval: 180dCal Std.: 0.01 mol/l KCL40.0 °CConduct./Tref25: 1413µS/cmCell Const : 0.975 1/cmProbe : +++* only on the Cond 730 with integrated printer27


Operation Cond 730Calibration interval(Int 3)The flashing sensor symbol reminds you to calibrate regularly.After the selected calibration interval (Int 3) expires,the sensor symbol flashes. Measurements can continue.NoteTo ensure the high measuring precision of the measuringsystem, perform a calibration after the calibration intervalexpires.Setting thecalibration intervalThe calibration interval (Int 3) is set to 180 days in the factory.The interval can be changed (1 ... 999 days):1 Switch off the instrument.2 Press m and hold down the key.3 Press the e key.The display test appears briefly on the display.The instrument then switches automatically to theconfiguration level.4 Press the g key until Int 3 appears on the display.5 Press 82 to set the required time interval until thenext calibration.6 Confirm with g.7 Change to the measuring mode by pressing m.28


Cond 730Operation4.3.2 Setting the cell constant manuallyNoteThe cell constant to be set up must either be taken from theoperating manual of the measuring cell or is printed on themeasuring cell.You can set the the cell constant manually as follows:Setting the fixed cell1 Press the c key repeatedly until CELL appears onconstantthe display.0.010 cm -12 Press the g key.3 Press the c key repeatedly until the cell constant0.010 cm -1 appears on the display.4 To return to the measuring mode: Press the m key.From now on, the cell constant 0.010 cm -1 will beused.29


Operation Cond 730Range1 Press the c key repeatedly until CELL appears on0.090 ... 0.110 cm -1 the display.2 Press the g key.3 Press the c key repeatedly until a cell constant inthe range 0.090 ... 0.110 cm -1 appears.4 Set the cell constant to be used with 82,e.g. 0.105 cm -1 .5 To return to the measuring mode: Press the m key.From now on, the new cell constant will be used.30


Cond 730OperationRange1 Press the c key repeatedly until CELL appears on0.250 ... 2.500 cm -1 the display.2 Press the g key.3 Press the c repeatedly until until a cell constant inthe range 0.250 ... 2.500 cm -1 appears.4 Set the cell constant to be used with 82,e.g. 0.614 cm -1 .5 To return to the measuring mode: Press the m key.From now on, the new cell constant will be used.31


Operation Cond 7304.4 Setting up the temperature compensation TCThe calculation of the temperature compensation is basedon the preset reference temperature, Tref 20 or Tref 25 (seesection 4.7 CONFIGURATION).You can select one of the following temperature compensations: Non-linear temperature compensation "nLF"according to DIN 38404 or EN 27 888 linear temperature compensation "Lin" with a coefficientthat can be set in the range 0.001 ... 3.000 %/K no temperature compensationipsNoteSelect the following temperature compensations to workwith the test samples given in the table:ApplicationnotesTest sampleTemperaturecompensation TCDisplayindicatorNatural water(ground water,surface water,drinking water)nLFaccording to DIN 38404EN 27 888Ultrapure waternLFaccording to DIN 38404EN 27 888Other aqueoussolutionsSet lineartemperature coefficient0.001 ... 3.000 %/KSalinity(seawater)Automatically nLFaccording to IOTSal,32


Cond 730OperationSelecting the nonlineartemperaturecompensationTo select the non-linear temperature compensation proceedas follows:1 Press the c key repeatedly until LF tc appears onthe display.2 Press the g key.3 Press the c key repeatedly until nLF appears on thedisplay.4 To return to the measuring mode: press the m key.33


Operation Cond 730Selecting the lineartemperaturecompensationTo select the linear temperature compensation proceed asfollows:1 Press the c key repeatedly until LF tc appears onthe display.2 Press the g key.3 Press the c key repeatedly until the adjustablelinear temperature coefficient appears on the display.4 Set up the temperature coefficient, e. g. 1.880 %/Kusing 82.5 To return to the measuring mode: press the m key.34


Cond 730OperationSwitching off thetemperaturecompensationTo switch off the temperature compensation proceed as follows:1 Press the c key repeatedly until LF tc appears onthe display.2 Press the g key.3 Press the c key repeatedly until the followingdisplay appears:4 The temperature compensation has been switchedoff.5 To return to the measuring mode: press the m key.35


Operation Cond 7304.5 StoringThe conductivity meter has an internal data storage device.Up to 800 data records can be stored in it.A complete data record consists of: Memory location Date Time Measured value Temperature I.D. numberYou can transmit measured values (data records) to thedata storage in 2 ways: Manual storage Switching on the AutoStore function (Int 1), see page 38.4.5.1 Manual storageYou can transmit a measured value to the data storage asfollows:1 Press the s key.The current number of the next free memory locationappears on the display.36


Cond 730Operation2 Confirm with g.The display changes to the input of the I.D. number.3 Enter the required I.D. number (1 ... 999) by pressing82.4 Confirm with g.The instrument changes to the measuring mode.StoFull messageThis message appears if all 800 memory locations are full.You have the following options:Store the current measured value.The oldest measured value is overwrittenby thisReturn to the measuring mode withoutstoringPress gPress any keyOutput the data storage See page 40Delete the data storage See page 4637


Operation Cond 7304.5.2 Switching on AutoStore (Int 1)The storage interval (Int 1) determines the time intervalbetween automatic storage processes.After the time interval expires, the current data record istransmitted to the data storage and to the printer/interface.The storage interval (Int 1) is set to OFF in the factory.Thus, the AutoStore function is switched off.To switch the function on, set up a time interval (5 s, 10 s,30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min).NoteIf the AutoStore function is active, the setting of the datatransmission interval (int 2) is ineffective (see page 47).Setting the storageinterval1 Press and hold down the g key.2 Press the s key. Int 1 appears on the display.3 Press the 82 keys to set up the required timeinterval between storage processes.4 Confirm with g.The number of free memory locations appears on thedisplay.38


Cond 730Operation5 As soon as all 800 memory locations are full, theAutoStore function is terminated (Int 1 = OFF).If too few storage locations are available for yourmeasurements:– backup the data storage (see page 40) and– clear the data storage (see page 46).6 Confirm with g.The prompt for the I.D. number appears on thedisplay.7 Press 82 to set the required I.D. number.8 Confirm with g.The instrument changes to the measuring mode andstarts the measuring and storage procedure.AutoStore flashes on the display.39


Operation Cond 730NoteThe AutoStore function is interrupted if you perform otherfunctions, e.g. output data storage.After completing the other function, the AutoStore functioncontinues. However, as a result, gaps can occur in therecording of the measured values.Switching off theAutoStoreSwitch off the AutoStore function by: Setting the storage interval (Int 1) to OFF or Switch the conductivity meter off and on again.4.5.3 Outputting the data storageThe contents of the data storage can be output to the: display printer/interfaceOutputting to thedisplay1 Press the r key repeatedly until Sto disp appearson the display.2 Press the g key.A measured value appears on the display.The I. D. number of the data record appears forapprox. 2 s.40


Cond 730Operation3 After 2 s the respective temperature of the datarecord appears on the display. Stored data recordsare displayed together with the RCL displayindicator.You can perform the following activities:Display further parameters of the data record(I.D. no., date, time, memory location)Press gAdvance one data record (memory location) Press 8Go back one data record (memory location) Press 241


Operation Cond 730NoteIf you want to find a specific parameter (e.g. date), proceedas follows:1 Press the r key repeatedly until Sto disp appearson the display.2 Press the g key.A measured value appears on the display.The I. D. number of the data record appears forapprox. 2 s.3 After 2 s the respective temperature of the datarecord appears on the display.4 Select the parameter (e.g. date) by pressing g.5 Press 8 or 2 repeatedly until the requireddate appears on the display.After approx. 2 s, the temperature of the displayedmeasured value appears.42


Cond 730OperationOutputting to theinterface1 Press the r key repeatedly until Sto SEr appearson the display.2 Press the g key.The protocol of the last calibration is transmitted tothe printer/RS interface. In the meantime, Sto CALappears on the display.Following the calibration protocol, the completecontents of the storage is transmitted to the interface.NoteYou can cancel the transmission by pressing m or g.43


Operation Cond 730Sample printoutCALIBRATION PROTOCOL14.04.99 11:37Device No.: 99990000CALIBRATION CONDUCTIVITYCal Time: 14.04.99 / 11:37Cal Interval: 180dCal Std.: 0.01 mol/l KCL23.0 °CConduct./Tref25: 1413 µS/cmCell Const : 0.975 1/cmProbe: +++No. 1:01.01.99 00:042.40 mS/cm 25 °CTmannLFTref25 C = 0.475 1/cmIdent : 1No. 2:10.01.99 10:092.40 mS/cm 25.3 °CTautonLFTref25 C = 0.475 1/cmIdent : 1No. 3:12.01.99 01:482.40 mS/cm 21.6 °CTautonLFTref25 C = 0.475 1/cmIdent : 1The printoutcontains: Calibration protocol:– Date/time of the printout– Instrument number (Device No.)– Date/time of the calibration (Cal Time)– Calibration interval (Cal Interval)– Calibration standard 0.01 mol/l KCL (Cal Std.) [°C/F]– Conductivity of the calibration standard at 25 °C(Conduct./Tref25)– Cell constant (Cell Const)– Probe evaluation (Probe)44


Cond 730Operation Contents of the measuring storage:– Number of the storage location (No.)– Date/time of measurement– Measured value/unit (mS/cm) [°C/F]– Automatic/manual temperature measurement(Tauto/Tman)– Temperature compensation (nLF)– Tref– Cell constant (1/cm)– AutoRead function (AR)– I.D. number (Ident)45


Operation Cond 7304.5.4 Clearing the storageThis function can erase the stored data records. 800 memorylocations will then become available again.NoteThe Clear store function only appears if data records havealready been stored in the storage. Otherwise, the conductivitymeter automatically changes to the measuring mode.In order to delete all the data records, proceed as follows:1 Switch off the instrument.2 Press and hold down the s key.3 Press the e key.The display test appears briefly on the display.4 Confirm the clearing process by pressing g.Pressing any other key stops the clearing processand the data records remain in the storage.NoteThe calibration data remain in the storage and can be calledup via the calibration protocol.46


Cond 730Operation4.6 Data transmissionYou can use the following options to transmit data: One of the following options:– The AutoStore function (page 38) is used toperiodically (Int 1 storage interval) save measuredvalues internally and output them on the printer/interface.– The data transmission interval (Int 2) function is used toperiodically output measured values to the printer/interface (see below). The Output data store function (page 40) is used to outputcalibration data and stored measured values to theprinter/interface. The analog recorder output (page 49) is used to outputmeasured values as voltages.4.6.1 Data transmission interval (Int 2)The interval for the data transmission (Int 2) determines thetime interval between automatic data transmissions. Afterthe time interval expires, the current data record is transmittedto the printer/interface.NoteThe setting of the interval (Int 2) only has an effect when thestorage interval (AutoStore function) is switched off.47


Operation Cond 730Setting thedata transmissionintervalThe interval is set to OFF in the factory.To start the data transmission, set up an interval (5 s, 10 s,30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):1 Press and hold down the g key.2 Press the a key.Int 2 appears on the display.3 Press 82 to set up the required time intervalbetween storage processes.4 Confirm with g.The instrument changes automatically to themeasuring mode.NoteIf the AutoStore function is active, the data transmission isperformed according to the setting of the storage interval(Int1). Set the storage interval (Int 1) to OFF to activate thedata transmission interval (Int 2).NoteYou can also set the data transmission interval (Int 2) in theConfiguration menu (see page 52).48


Cond 730Operation4.6.2 Recorder (analog output)You can transmit the data to a recorder via the analog output.Connect the analog output to the recorder via theAK323 interface cable.The data output switches automatically to recorder output.Socket assignment41 23RS 232REC1 Free2 Plug coding3 Ground4 Analog output(internal resistance < 5 Ohm)NoteActivate the analog output by connecting 2 and 3 or use theoriginal cable.The signal range of the analog output depends on the measuredparameter and the measuring range:Conductivity/resistanceMeasuring range Voltage Resolution0.000 ... 1.999 µS/cm 0 ... 1999 mV 1 mV0.00 ... 19.99 µS/cm 0 ... 1999 mV 1 mV0.0 ... 199.9 µS/cm 0 ... 1999 mV 1 mV0 ... 1999 µS/cm 0 ... 1999 mV 1 mV0.00 ... 19.99 mS/cm 0 ... 1999 mV 1 mV0.0 ... 199.9 mS/cm 0 ... 1999 mV 1 mV0 ... 500 mS/cm 0 ... 500 mV 1 mVSalinityMeasuring range Voltage Resolution0 ... 70.0 0 ... 700 mV 1 mVTDSMeasuring range Voltage Resolution0 ... 1999 mg/l 0 ... 1999 mV 1 mV49


Operation Cond 7304.6.3 PC/external printer (RS232 interface)You can transmit data to a PC or an external printer via theRS232 interface.Connect the interface to the instrument via the AK340/Bcable (PC) or AK325/S cable (external printer).The data output switches automatically to RS232.NoteThe RS232 interface is not galvanically isolated.If it is connected to an earthed PC/printer, measurementscannot be made in earthed media as this would give incorrectresults!Set up the following transmission data on the PC/printer:Baud rateHandshakePC only:ParityData bits 8Stop bits 1Selectable between:1200, 2400, 4800, 9600RTS/CTS + Xon/XoffNoneSocket assignment41 23RS 232REC1 CTS2 RxD3 Ground4TxD50


Cond 730Operation4.6.4 Operation with MultiLab pilotWith the aid of the MultiLab pilot software, you can recordand evaluate measuring data with a PC. The data is transmittedafter the measuring instrument is connected to theRS232 serial interface (COM interface) of a PC.NoteMore detailed information can be found in the MultiLab pilotoperating manual.51


Operation Cond 7304.7 ConfigurationYou can adapt the conductivity meter to your individualrequirements. To do this, the following parameters can becalled up/changed (the status on delivery is marked in bold):Baud rate 1200, 2400, 4800, 9600Data transmission interval(Int 2)Calibration interval (Int 3)AutoRange ARngTREF 25/TREF 20Measured values givenas conductivity or resistancevaluesOFF, 5 s, 10 s, 30 s, 1 min,5 min, 10 min, 15 min, 30 min,60 min1 ... 180 ... 999 dyes, not20 or t25Temperature unit °C, °FDate/timeS/cm or MΩAs requiredNoteYou can leave the configuration menu at any time. Parametersthat have already been changed are stored.To do this, press the m key.1 Switch off the instrument.2 Press and hold down the m key.3 Press the e key.The display test appears briefly on the display.The instrument then switches automatically to thesetting of the baud rate.52


Cond 730OperationBaud rateData transmissioninterval4 Set up the required baud rate by pressing 82.5 Confirm with g. Int 2 appears on the display.6 Set up the required time interval by pressing 82.7 Confirm with g. Int 3 appears on the display.Calibrationinterval8 Set up the required time interval by pressing 82.9 Confirm with g. ARng appears on the display.53


Operation Cond 730ARng (AutoRange)Referencetemperature10 With 82 select between YES and no.11 Confirm with g. t25 appears on the display.12 With 82 select between t25 and t20 .13 Confirm with g. LF appears on the display.Conductivity14 With 82 select between S/cm and MΩ.15 Confirm with g.USE °C appears on the display.54


Cond 730OperationTemperature unit16 Select between °C and °F by pressing 82.17 Confirm with g.The date flashes on the display.Date and time18 Set today’s date by pressing 82.19 Confirm with g.The date (month) flashes on the display.20 Set the current month by pressing 82.21 Confirm with g.The year appears on the display.55


Operation Cond 73022 Set the current year by pressing 82.23 Confirm with g.The hours flash on the display24 Set the current time by pressing 82.25 Confirm with g.The minutes flash on the display.26 Set the current time by pressing 82.27 Confirm with g.The instrument changes automatically to theconductivity measuring mode.56


Cond 730Operation4.8 ResetYou can reset (initialize) measuring and configurationparameters separately from one another.MeasuringparametersThe following measuring parameters (Cond InI) are reset tothe values they had on delivery:Measuring modeCell constantTemperaturecompensationReference temperatureTemperature coefficient ofthe linear temperaturecompensation0.475 cm -1 (calibrated)0.475 cm -1 (set up)nLFTDS factor 1.002.000 %/KNoteWhen the measuring parameters are reset, the calibrationdata are lost. After the parameters have been reset, calibrate!ConfigurationparametersThe following configuration parameters (InI) are reset to thevalues they had on delivery:Baud rate 4800Interval 1(automatic storing)Interval 2(for data transmission)OFFOFF57


Operation Cond 730Resettingmeasuringparameters1 Press and hold down the g key.2 Press the c key.3 Use 82 to toggle between no and YES.yes: reset measuring parameters.no: retain settings.4 Confirm with g.The instrument changes to the configurationparameters.Resettingconfigurationparameters5 Toggle between no and yes by pressing 82.yes: reset configuration parameters.no: retain settings.6 Confirm with g.The instrument changes automatically to theconductivity measuring mode.58


Cond 730Maintenance, cleaning, disposal5 Maintenance, cleaning, disposal5.1 MaintenanceThe maintenance tasks are restricted to the following activities: replacing the batteries and replacing the roll of printer paper*.NoteSee the relevant operating manual of the measuring cell forinstructions on maintenance.* only on the Cond 730 with integrated printer59


Maintenance, cleaning, disposal Cond 7305.1.1 Changing the batteries1 Open the battery compartment (1) on the undersideof the instrument.2 Remove the four batteries from the batterycompartment.3 Insert four new batteries (Type Mignon AA) into thebattery compartment.4 Close the battery compartment (1).The date (day) flashes on the display.5 Set up the date and time according to section 3.2.1CautionMake sure that the poles of the batteries are the right wayround.The ± signs in the battery compartment must correspond tothe ± signs on the batteries.Only use leakproof alkaline manganese batteries.60


Cond 730Maintenance, cleaning, disposal5.1.2 Replacing the roll of printer paper *1 Switch off the printer (Print LED lights up red).2 Open the lid of the printer (1).3 Remove the empty roll of paper (2).4 Insert the new roll of paper:– Fold the leading edge of the paper inwards andthread it into the printer (3) from underneath.– Press the f Print key (paper feed).5 Close the lid of the printer (1).123NoteOnly use original WTW rolls of printer paper. Information onthis is given in the WTW catalog, LABORATORY AND FIELDINSTRUMENTATION or via the Internet.You can also use HQ thermal paper that remains legible forat least 10 years.* only on the Cond 730 with integrated printer61


Maintenance, cleaning, disposal Cond 7305.2 CleaningOccasionally wipe the outside of the measuring instrumentwith a damp, lint-free cloth. Disinfect the housing with isopropanolas required.CautionThe housing is made of synthetic material (ABS). Thus,avoid contact with acetone or similar detergents that containsolvents. Remove any splashes immediately.Packing5.3 DisposalThe measuring instrument is sent out in a protective transportpacking.We recommend: Keep the packing material. It protects theinstrument against damage during transport.BatteriesThis note refers to the battery regulation that applies in theFederal Republic of Germany. We would ask end-consumersin other countries to follow their local statutory provisions.NoteIn compliance with §14 of the BATTERY REGULATION, wewould like to point out that this instrument contains batteries.Batteries that have been removed must only be disposed ofat the recycling facility set up for this purpose or via the retailoutlet.It is illegal to dispose of them in household refuse.MeasuringinstrumentDispose of the measuring instrument as electronic waste atan appropriate collection point. It is illegal to dispose of it inhousehold refuse.62


Cond 730What to do if...6 What to do if...Error message,OFLCauseThe measured value is outsidethe measuring range– Measuring cell notconnectedRemedy– Connect measuring cell– Cable broken – Replace electrodeError message,E3Cause– Measuring cellcontaminated– Unsuitable calibrationsolutionRemedy– Clean measuring cell; ifnecessary, replace it– Check calibrationsolutionsLoBatCauseRemedy– Batteries almost depleted – Replace batteries(see section 5.1.1CHANGING THEBATTERIES)Instrument does notreact to keystrokeCause– Operating state undefinedor EMC electric stressunallowedRemedy– Processor reset:Press the a key andswitch on instrument63


What to do if... Cond 730You would like toknow whichsoftware version isin the instrumentCause– e.g. question of the WTWservice departmentRemedy– Press the a key andswitch on instrument.The software versionis displayed.todisplayCauseRemedy– Timeout of the interface – Check connectedinstrumentStoFullmessageCause– All 800 memory locationsare fullRemedy– Output data storage andclear data storage64


Cond 730What to do if...Integrated printerdoes not print **CauseRemedy– Printer switched off – Switch on printer– No mains power supplyconnected– Connect mains powersupply– Interface cable connected – Unplug cable– No paper available – Replace roll of paper– AutoStore function isswitched on with a longerinterval duration (Int 1)– Switch off AutoStorefunctionIntegrated printerprints automatically *Cause– AutoStore function(Int 1) or Data transmission(Int 2) is switched onRemedy– Switch off functionsPrint key fdoes not react *CauseRemedy– Printer is switched on – Switch off printer– Interface cable connected – Unplug cablePrinter operating -paper notbeing printed *Cause– Paper inserted with wrongside upwardsRemedy– Turn the roll of paperaround and insert it withthe other side upwards* only on the Cond 730 with integrated printer65


What to do if... Cond 73066


Cond 730Technical data7 Technical dataAmbienttemperatureStorage temperatureOperating temperatureAllowable relativehumidity- 25 °C ... + 65 °C0 °C ... + 55 °CAnnual mean: < 75 %30 days/year: 95 %Other days: 85 %Measuring rangesand resolution[µS/cm]0.000 ... 1.999(only with 0.010 cm -1 cell constant )0.00 ... 19.99(only with 0.010 cm -1 constant and0.090 ... 0.110 cm -1 cell constant )0.0 ... 199.90 ... 1999[mS/cm]Spec. resistance[MΩ*cm]SAL0.00 ... 19.990.0 ... 199.90 ... 5000.000 ... 1.9990.00 ... 19.990.0 ... 199.90 ... 19990.0 ... 70.0 according to the IOT tableTDS [mg/l] 0 ... 1999Factor can be set in the range0.40 ... 1.00T [°C] − 5.0 ... + 105.0T [°F] + 23.0 ... + 221.067


Technical data Cond 730Accuracy(± 1 digit)No compensation:Accuracy ± 0.5 %Non-linear compensation :Accuracy Test sample temperature± 0.5 % 0 °C ... 35 °Caccording to EN 27 888;± 0.5 % 35 °C ... 50 °Cextended nLF function according toWTW measurementsLinear compensation :Accuracy Test sample temperature± 0.5 % 10 °C ... 75 °C(the accuracy percentage always refersto the measured value!)SAL Range 0.0 ... 42.0Accuracy Test sample temperature± 0.1 5 °C ... 25 °C± 0.2 25 °C ... 30 °CTDS [mg/l] 1T [°C] NTC 30:Accuracy ± 0.1PT 1000:Accuracy Operating temperature± 0.5 0 °C ... 15 °C± 0.1 15 °C ... 35 °C± 1 35 °C ... 55 °CT [°F] NTC 30:Accuracy ± 0.2PT 1000:Accuracy Operating temperature± 0.9 32 °F ... 59 °F± 0.2 59 °F ... 95 °F± 1.8 95 °F ... 131 °F68


Cond 730Technical dataCell constant,to be setC [cm -1 ] 0.0100.090 ... 0.1100.250 ... 2.500Cell constant,calibratedC [cm -1 ] 0.450 ... 0.5000.800 ... 1.200Reference temperature,selectableTREF [°C] 2025Temperature inputManual [°C] - 5 ... +100Dimensions andweightLength [mm] 230Width [mm] 300Height [mm] 70Weight [kg] Approx. 1.3(without plug-in power supply unit)69


Technical data Cond 730Analog outputAutomatic switch-over when the AK 323 recorder cable isconnected.Signal rangeAccuracyInternalresistance0 ... 1,999 V for the range0 ... 1999 digits± 0,5 % of diplayed value± 0,1 (% saturation)or± 0,5 %of displayed value ± 0.01 mg/l< 5 ohms(current limitation to max. 0.2 mA outputcurrent)Serial interface Automatic switch-over when the AK 340/B or AK 325/Scable is connected.TypeBaud rateData bits 8Stop bit 1ParityHandshakeCable lengthRS 232, data outputcan be set to 1200, 2400, 4800, 9600 BaudnoneRTS/CTS+Xon/Xoffmax. 15m70


Technical data Cond 730FCC Class A Equipment StatementNote: This equipment has been tested and found to comply withthe limits for a Class A digital device, pursuant to Part 15 of theFCC Rules. These limits are designed to provide reasonableprotection against harmful interference when the equipment isoperated in a commercial environment. This equipmentgenerates, uses, and can radiate radio frequency energy and, ifnot installed and used in accordance with the instruction manual,may cause harmful interference to radio communications.Operation of this equipment in a residential area is likely to causeharmful interference in which case the user will be required tocorrect the interference at his own expense.72


Cond 730Lists8 ListsThis chapter provides additional information and orientationaids.AbbreviationsThe list of abbreviations explains abbreviations that appearon the display or when dealing with the instrument.Specialist termsThe glossary briefly explains the meaning of the specialistterms. However, terms that should already be familiar to thetarget group are not described here.IndexThe index helps you find the topics that you are looking for.73


Lists Cond 730AbbreviationsABSARARngAutoStoreConductivity valuePlastic housingAutoRead (drift control)Automatic range switchingMeasuring instrument measures with highestresolutionAutomatic storingBaud Baud rateC Cell constant cm -1CalCELLdispE3IdentInIIntLinLoBatnLFOFLSalSELVSto ClrCalibrationCell constantDisplayOutput of the data storage on the displayError message(see chapter 6 WHAT TO DO IF...)I. D. numberInitializationResets individual basic functions tothe status they had on deliveryIntervalLinear temperature compensationLow BatteryBatteries are almost emptyNon-linear temperature compensationOverflowDisplay range exceededSalinitySafety Extra Low VoltageClear storage74


Cond 730ListsSto dispSto FullSto SErTautoTCTDSTPOutput of the data storage on the displayMemory fullOutput of the data storage to the printer/interfaceAutomatic temperature measurementTemperature coefficientTotal dissolved solidsTemperature ProbeTemperature measurement activeTref 20/T20 Reference temperature 20 °CTref 25/T25 Reference temperature 25 °C°C Temperature unit °Celsius°F Temperature unit Fahrenheit75


Lists Cond 730GlossaryAutoReadMonitors the electrode drift and releases the measuredvalue only after the stability criterion has been reached. Inthis way, this procedure ensures the highest degree of precisionand reproducibility.CalibrationThe cell constant is determined through calibration. To doso, the conductivity measuring cell is immersed into a seriesof aqueous salt solutions with exactly known electric conductivity.The relevant conductivity values are determinedusing the conductivity measuring instrument.Cell constantLinear factor describing the geometrical dimensions of ameasuring cell and its electrodes. With the value of the cell constant you can roughly describethe application range of a conductivity measuring cell. The cell constant is determined through calibration in oneor several calibration solutions.ConductivityThe conductivity value is a sum parameter for the ion concentrationof a test sample.Control standardsolutionSolution with a known conductivity to determine or check theconductivity.Drift controlSee AUTOREAD.ReferencetemperatureIn order to compare values measured at different temperatures,the values have to be converted to a fixed temperature.This temperature is 25 °C, or, as an exception, 20 °C.76


Cond 730ListsResistanceAll substances (solids, liquids, or gases) with mobile chargecarriers like for example electrons or ions have a finite ohmicresistance, which means they have an electric conductancethat can be measured or an electric conducitivtiy.SalinityThe salinity is a sum parameter especially for seawater;it gives the salt content of seawater.Temperaturecompensation (TC)The temperature has a very strong impact on the electricalconductivity. To be able to compare measured values, it isnecessary to temper or convert the test sample to a referencetemperature.Test sampleThe sample to be measured. It can be liquid or solid.Total dissolvedsolids (TDS)Mass that remains of the substances dissolved in an aqueoussolution after a fixed filtering and drying procedure, asfar as these substances are not volatile under the conditionsof this procedure. The total dissolved solids refer to the volumeof the filtered aqueous sample used und are given inmg/l.77


Lists Cond 73078


Cond 730ListsIndexAanalog output . . . . . . . . . . . . . . . . . 49authorized use . . . . . . . . . . . . . . . . 10AutoRange . . . . . . . . . . . . . . . . . . . 54AutoRead . . . . . . . . . . . . . . . . . . . . 20AutoStore . . . . . . . . . . . . . . . . . . . . 38Bbatteriesreplacing . . . . . . . . . . . . . . . . . . 59battery compartment . . . . . . . . . . . . 60baud rate, setting . . . . . . . . . . . . . . 53Ccalibration . . . . . . . . . . . . . . . . . . . . 25interval . . . . . . . . . . . . . . . . . . . . 28protocol . . . . . . . . . . . . . . . . . . . 27calibration evaluation . . . . . . . . . . . 27cell constant . . . . . . . . . . . . . . . 18, 25commissioning . . . . . . . . . . . . . . . . 13condition on delivery . . . . . . . . . . . . 57Conductivity . . . . . . . . . . . . . . . . . . 21conductivity . . . . . . . . . . . . . . . . . . . 54conductivity/resistance . . . . . . . . . . 49Ddata record . . . . . . . . . . . . . . . . . . . 36data transmission (interval) . . . . . . . 48date, setting . . . . . . . . . . . . . . . 13, 55display . . . . . . . . . . . . . . . . . . . . . . . . 7drift control . . . . . . . . . . . . . . . . . . . 20Eenergy saving feature . . . . . . . . . . . 17error messages . . . . . . . . . . . . . . . . 63Iinitial commissioning . . . . . . . . . . . . 13initialize . . . . . . . . . . . . . . . . . . . . . . 57intervalcalibration (Int 3) . . . . . . . . . . . . 28data transmission (Int 2) . . . . . . 47storing (Int 1) . . . . . . . . . . . . . . . 38Kkeys . . . . . . . . . . . . . . . . . . . . . . . . . 6Llinear temperature compensation . . 34LoBat . . . . . . . . . . . . . . . . . . . . . . . 63Mmanual storing . . . . . . . . . . . . . . . . 36measuring . . . . . . . . . . . . . . . . . . . . 19measuring precision . . . . . . . . . . . . 28MultiLab pilot . . . . . . . . . . . . . . . . . 51Nnon-linear temperaturecompensation . . . . . . . . . . . . 33Ooperation . . . . . . . . . . . . . . . . . . . . 17operational safety . . . . . . . . . . . . . . 10output data storage . . . . . . . . . . . . 40Ppaper rollreplacing . . . . . . . . . . . . . . . . . . 59place of the instrument . . . . . . . . . . 17plug-in power supplyconnecting . . . . . . . . . . . . . . . . . 14printingcalibration protocol . . . . . . . . . . 27measured values . . . . . . . . . . . . 24printing measured values . . . . . . . . 2479


Lists Cond 730Rrecorder output . . . . . . . . . . . . . . . .49reference temperature . . . . . . . . 54, 58reset . . . . . . . . . . . . . . . . . . . . . . . .57RS232 interface . . . . . . . . . . . . . . . .50Ssafety . . . . . . . . . . . . . . . . . . . . . . . . .9safety precautions . . . . . . . . . . . . . . .9salinity . . . . . . . . . . . . . . . . . . . . . . .49salinity measurement . . . . . . . . . . .22scope of delivery . . . . . . . . . . . . . . .13sockets . . . . . . . . . . . . . . . . . . . . . . .7Specific resistance . . . . . . . . . . . . .21storing . . . . . . . . . . . . . . . . . . . . . . .36switching on . . . . . . . . . . . . . . . . . . .13TTDS . . . . . . . . . . . . . . . . . . . . . . 23, 49technical data . . . . . . . . . . . . . . . . .67temperature compensation . . . . . . .32linear . . . . . . . . . . . . . . . . . . . . . .34non-linear . . . . . . . . . . . . . . . . . .33setting . . . . . . . . . . . . . . . . . . . . .32switch off . . . . . . . . . . . . . . . . . .35temperature probe . . . . . . . . . . . . . .19temperature unit . . . . . . . . . . . . . . .55time, setting . . . . . . . . . . . . . . . . 13, 55total dissolved solidsmeasurement . . . . . . . . . .23transmit data . . . . . . . . . . . . . . . . . .4780

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