Xylem Analytics France SAS

ba52318e02 03/2004 Multi 340i Operating manual AR RCL ST O C A L M O 6 7 1 9 2 7 O °C m g/l ARng TP pH/Dissolved Oxygen/Conductivity Measuring Instrument Accuracy when going to pressThe use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Al- so, we cannot guarantee that there are absolutely no errors in this man- ual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions. WarrantyWe guarantee the instrument described for 3 years from the date of purchase. The instrument warranty covers manufacturing faults that are discov- ered within the warranty period. The warranty does not cover compo- nents that are replaced during maintenance work, e. g. batteries. The warranty claim extends to restoring the instrument to readiness for use but not, however, to any further claim for damages. Improper han- dling or unauthorized opening of the instrument invalidates any warran- ty claim. To ascertain the warranty liability, return the instrument and proof of purchase together with the date of purchase freight paid or prepaid. Copyright © Weilheim 2004, WTW GmbH Reproduction in whole - or even in part - is prohibited without the ex- press written permission of WTW GmbH, Weilheim. Printed in Germany. Multi 340iList of contents 3 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.5 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.6 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 12 3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1 Switching on the measuring instrument . . . . . . . . . . . . . 15 4.2 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16 4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 18 4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 19 4.2.4 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.3.1 General information . . . . . . . . . . . . . . . . . . . . . . 26 4.3.2 Measuring the D. O. concentration . . . . . . . . . . 27 4.3.3 Measuring the D. O. saturation . . . . . . . . . . . . . 28 4.3.4 AutoRead AR (Drift control) . . . . . . . . . . . . . . . 29 4.3.5 D. O. calibration . . . . . . . . . . . . . . . . . . . . . . . . 30 4.3.6 Salt content correction . . . . . . . . . . . . . . . . . . . 33 4.4 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 34 4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 36 4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 36 4.4.4 AutoRead AR (Drift control) . . . . . . . . . . . . . . . 37 4.4.5 Determining the cell constant (Calibration in the control standard) . . . . . . . . . . . . . . . . . . . . . . . . 38 4.5 Calibration intervals (Int 3, Int 4, Int 5) . . . . . . . . . . . . . . 41 4.6 Saving data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 42 4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 44 4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 46 4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 52 4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 53 List of contentsMulti 340i 4 4.7.2 PC/external printer (RS 232 interface) . . . . . . . . 55 4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 55 4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 63 5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6.2 Oxi system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.3 Conductivity system messages . . . . . . . . . . . . . . . . . . . 68 6.4 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Multi 340iOverview 5 1Overview 1.1 General features The compact precision handheld meter Multi 340i enables you to carry out pH measurements, dissolved oxygen (D. O.) measurements and conductivity measurements quickly and reliably. The Multi 340i handheld meter provides the maximum degree of oper- ating comfort, reliability and measuring certainty for all applications. The proven MultiCal ® and OxiCal ® calibration procedures and the pro- cedures to determine/set up the cell constant support you in your work with the meter. The special AutoRead function enables precise mea- surements. Note If you need further information or application notes, you can obtain the following material from WTW:
Application reports
Primers
Safety datasheets. You will find information on available literature in the WTW catalog or via the Internet. 1Keypad 2Display 3Jack field AR RCL ST O C AL M O 6 7 1 9 2 7 O °C m g/l ARng TP 1 2 3 OverviewMulti 340i 6 1.2 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. Set (sample configuration): 1Multi 340i meter, carrying strap with 2 carrying clips, armoring 2Cond/Oxi beaker with beaker clip 3pH beaker 4Stand 5Plastic beaker 6Storing solution for pH electrodes 1 2 45 11 109 1213 141516 17 18 19 8 7 6 5 4 3 Multi 340iOverview 7 750 ml pH buffer solution, STP 4 850 ml pH buffer solution, STP 7 9Calibration and control standard for conductivity measuring cells, 50 ml 1050 ml ELY/G electrolyte solution for D.O. probes 1150 ml RL/G cleaning solution for D.O. probes 12WP 90/3 exchange membrane heads for D. O. probes (3 pieces) 13SF 300 abrasive film for D.O. probes 14Conductivity measuring cell –TetraCon® 325-3 or –TetraCon® 325 15pH electrode –SenTix 41-3 or –SenTix 41 16Oxygen sensor –CellOx 325-3 or –CellOx 325 17Operating manual + short operating manual 18Equipment case 19Plug-in power supply unit OverviewMulti 340i 8 1.3 Keypad Key functions RUN/ENTERAR RCL CALSTO M Select the measured variable : –pH value / ORP voltage –D. O. concentration / D. O. saturation –Conductivity / salinity Save a measured value Switch measuring instrument on/off Calibrate the currently set measured variable Display/transmit measured values Activate/deactivate the AutoRead function Select the measuring mode, increase values, scroll <
> Select the measuring mode, decrease values, scroll <> Confirm entries, start AutoRead, output measured values M STO CAL RCL AR RUN/ENTER Multi 340iOverview 9 1.4 Display 1.5 Jack field 1D. O. probe or conductivity measuring cell 2pH electrode 3pH temperature sensor 4Plug-in power supply unit 5RS232 serial interface ARng Tref20 AutoCal DIN Lin TDS cm M °F /K % Time Baud Day.Month No.Ident Year 8 8.8 8 8 8 °C % mg/l TP 1 mV/pH UpH Sal O S Tref25 nLF AutoCal TEC RCL Auto Store LoBat Cal AR 1/cm Sal mbar S/ m cm Status display Meas. value display Function and temperature displaySensor symbol 5 1234 OverviewMulti 340i 10 1.6 Operating structure The following overview diagram shows which keys you have to press to select between the different measuring modes: Note When a D. O. probe or a conductivity measuring cell with a temperature probe is connected, the measuring instrument recognizes the probe or measuring cell and automatically switches to the oxygen measuring mode or conductivity measuring mode last selected. As soon as the probe/measuring cell is disconnected, the instrument switches to the pH or ORP measuring mode. Multi 340iSafety 11 2 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 carefully before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system. Target groupThe measuring instrument was developed for work in the field and in the laboratory. Thus, we assume that, as a result of their professional training and ex- perience, the operators will know the necessary safety precautions to take when handling chemicals. Safety instructionsThe individual chapters of this operating manual use the following safe- ty instruction to indicate various types of danger: Warning indicates instructions that must be followed precisely in order to avoid the possibility of slight injuries or damage to the instrument or the envi- ronment. Further notes Note indicates notes that draw your attention to special features. Note indicates cross-references to other documents, e.g. operating manu- als. 2.1 Authorized use The authorized use of the measuring instrument consists exclusively of the:
pH and ORP measurement
measurement of the oxygen content and
measurement of the conductivity, salinity and temperature in the field and laboratory. The technical specifications as given in chapter 7 T ECHNICAL DATA must be observed. Only the operation and running of the measuring instru- ment according to the instructions given in this operating manual is au- thorized. Any other use is considered to be unauthorized. SafetyMulti 340i 12 2.2 General safety instructions This instrument is built and inspected according to the relevant guide- lines and norms for electronic measuring instruments (see chapter 7 T ECHNICAL DATA ). It left the factory in a safe and secure technical condition. Function and operating safetyThe smooth functioning and operational safety of the measuring instru- ment can only be guaranteed if the generally applicable safety mea- sures and the specific safety instructions in this operating manual are followed during operation. The smooth functioning and operational safety of the measuring instru- ment can only be guaranteed under the environmental conditions that are in specified in chapter 7 T ECHNICAL DATA . If the instrument was transported from a cold environment to a warm environment, the formation of condensate can lead to the faulty func- tioning of the instrument. In this event, wait until the temperature of the instrument reaches room temperature before putting the instrument back into operation. Safe operationIf safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent operation! Safe operation is no longer possible if the measuring instrument:
has been damaged in transport
has been stored under adverse conditions for a lengthy period of time
is visibly damaged
no longer operates as described in this manual. If you are in any doubt, please contact the supplier of the instrument. Obligations of the pur- chaserThe purchaser of the measuring instrument must ensure that the fol- lowing laws and guidelines are observed when using dangerous sub- stances:
EEC directives for protective labor legislation
National protective labor legislation
Safety regulations
Safety datasheets of the chemical manufacturers. Multi 340iCommissioning 13 3 Commissioning 3.1 Scope of delivery
Multi 340i handheld meter
Plug-in power supply unit
Operating manual and short operating manual
4 batteries, 1.5 V Mignon type AA (in the instrument) For details of scope of delivery of SETs, see section 1.2 SET S OF EQUIPMENT and WTW catalog. 3.2 Initial commissioning Perform the following activities:
Set the date and time
Connect the plug-in power supply (optional) Setting the date and time 1 Press the key and hold it down. 2 Press the key. The display test appears briefly on the display. 3 Press the key repeatedly until the date ap- pears on the display. 4 Set the date of the current day with <
> <>. 5 Confirm with . The date (month) flashes in the display. 6 Set the current month with <
> <>. 7 Confirm with . The year appears on the display. 8 Set the current year with <
> <>. 9 Confirm with . The hours flash on the display. 10 Set the current time with <
> <>. 11 Confirm with . The minutes flash on the display. 12 Set the current time with <
> <>. CommissioningMulti 340i 14 Connecting the plug-in power supplyYou can either operate the measuring instrument with batteries or with the plug-in power supply. The plug-in power supply supplies the mea- suring instrument with low voltage (12 VDC). This saves the batteries. Warning The line voltage at the operating site must lie within the input voltage range of the original plug-in power supply (see chapter 7 T ECHNICAL DA - TA ). Warning Use original plug-in power supplies only (see chapter 7 T ECHNICAL DATA ). 13 Confirm with . The instrument switches to a measuring mode. 14 Switch the instrument off using . 1 Plug the jack (1) into the socket (2) of the measuring instru- ment. 2 Connect the original WTW plug-in power supply (3) to an easily accessible mains socket. 2 1 3 Multi 340iOperation 15 4 Operation 4.1 Switching on the measuring instrument Measuring mode when switching on Note The measuring instrument has an energy saving feature to avoid un- necessary battery depletion. The energy saving feature switches the measuring instrument off if no key 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 the communication cable and a PC with a running communication program are connected,
if the printer cable is connected (for external printers). AutoRange measure- ment range selectionThere are several measuring ranges available for both oxygen and conductivity measurements. As a rule, the measuring instrument is in the measuring range with the highest possible resolution. If a measur- ing range is exceeded, AutoRange causes the measuring instrument to change automatically to the next higher measuring range. The AutoRange function is always active with oxygen and conductivity measurements and cannot be switched off. Note The measuring ranges for oxygen and conductivity measurements can be found in chapter 7 T ECHNICAL DATA . 1 Press the key. The display test appears briefly on the display. After this, the measuring instrument automatically switches to the measuring mode. Connected sensor Measuring mode No sensor or pH/ORP electrode pH or ORP measurement (de- pending on the last selected set- ting) D. O. probe or conductivity mea- suring cellLast selected measuring mode 2 sensors of any type Last selected measuring mode OperationMulti 340i 16 4.2 pH value / ORP voltage 4.2.1 General information Preparatory activitiesPerform the following preparatory activities when you want to measure: Note Incorrect calibration of pH electrodes leads to incorrect measured val- ues. Calibrate regularly before measuring. You can only connect elec- trodes of the NTC 30 type or without temperature sensor. Warning When connecting an earthed PC/printer, measurements cannot be per- formed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated. 1 Connect the pH electrode to the measuring instrument. If necessary, press the key repeatedly until the status dis- play pH (pH measurement) or U (measurement of the ORP voltage) appears. 2 Adjust the temperature of the buffer solutions or test solutions, or measure the current temperature, if you measure without a temperature sensor. 3 Calibrate or check the measuring instrument with the elec- trode. 4Using <
> <>, toggle between the pH or mV measuring modes. Multi 340iOperation 17 Temperature measure- ment in pH measure- mentsYou can perform pH measurements with or without a temperature sen- sor as well as with the temperature sensor of an oxygen sensor or a conductivity measuring cell. The measuring instrument recognizes which sensors are connected and switches automatically to the correct mode for the temperature measurement. The following cases are distinguishable. * If you do not wish that, you can: –either disconnect the 2nd sensor and use the manual temperature input or –use an electrode with a temperature sensor. If a temperature sensor is connected, it is indicated on the display by TP. Note When calibrating without a temperature sensor (no TP display indicator displayed), enter the current temperature of the respective buffer solu- tion manually using the <
> <> keys while keeping the key depressed. Temperature sensor Display Mode pH Cond or Oxi yes -TPAutomatic with pH temperature sensor yes yesTP - - Manual -yesTP flashesThe temperature value of the second probe (Cond or Oxi) in the same sample is taken over for the pH measurement* OperationMulti 340i 18 4.2.2 Measuring the pH value 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. For identical measurement conditions, the following criteria apply: 1 Perform the preparatory activities according to section 4.2.1. 2 Immerse the pH electrode in the test sample. 3 Press the <
> <> keys until pH appears in the status display. The pH value appears on the display. 4 When measuring without a connected temperature sensor: Options:
Determine the current temperature using a thermometer and, while keeping the key depressed, en- ter this temperature value with <
> <>.
TP display indicator not displayed, socket for the second probe is free: Connect the second probe (Oxi or Cond) and immerse it in the same sample. TP flashes, the temperature is automati- cally measured using the second probe. Tref20 Lin Cal 8 1 S Sal O U % mg/l mV/pH 1/cm Sal AutoCal DIN Tref25 nLF AutoCal TEC RCL Auto Store LoBat ARng AR Time Baud Day.Month No.Ident Year mbar TDS cm M °F /K % S/ m cm 8 4 2 9 9 6 °C TP pH Reproducibility Response time Better than 0.02 > 30 seconds 1 Call up the pH measuring mode with <
> <>. 2 Activate the AutoRead function with . The current measured value is frozen (hold function). Multi 340iOperation 19 Note The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing . 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 (U) of a solution. Note ORP electrodes are not calibrated. However, you can check ORP elec- trodes using a test solution. 3 Start AutoRead with . AR flashes until a stable measured value is reached. This measured value is transmitted to the interface. 4 If necessary, start the next AutoRead measurement with . 5 To terminate the AutoRead function: Press the key. 1 Perform the preparatory activities according to section 4.2.1. 2 Submerse the Redox electrode in the sample. 3 Press the <
> <> keys until the U status display appears. The ORP voltage (mV) of the sample appears on the display. 4 Wait for a stable measured value. /pH Tref20 Cal 8 TDS S 8 1 pH Sal O % mg/l 1/cm Sal AutoCal DIN Lin Tref25 nLF AutoCal TEC RCL Auto Store LoBat ARng AR Time Baud Day.Month No.Ident Year mbar cm M °F /K % S/ m cm 8 4 2 2 3 °C TP U mV OperationMulti 340i 20 4.2.4 pH calibration Why calibrate?pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an inexact measured value is dis- played. Calibration determines the current values of the asymmetry and slope of the electrode and stores them in the measuring instru- ment. Thus, you should calibrate at regular intervals. When to calibrate?
After connecting another electrode
When the sensor symbol flashes: –after the calibration interval has expired –after a voltage interruption, e. g. after changing the batteries AutoCal TECis 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 ONFIGURATION ), the instrument displays the relevant buffer nominal value or the current electrode voltage in mV. The calibration can be terminated after the first buffer solution. This cor- responds to a single-point calibration. To do this, the instrument uses the Nernst slope (-59.2 mV/pH at 25°C) and determines the asymme- try of the electrode. AutoReadThe calibration procedure automatically activates the AutoRead func- tion. The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing . Displaying the calibra- tion dataYou can view the data of the last calibration on the display. The pro- ceeding is described on page 48. Printing the calibration protocolThe calibration record contains the calibration data of the current cali- bration. You can transmit the calibration protocol to a printer via the se- rial interface (see O UTPUTTING THE CALIBRATION PROTOCOL ON THE INTERFACE , page 51). Note You can automatically print a calibration record after the calibration. To do so, connect a printer to the interface according to section 4.7.2 be- fore calibrating. After a valid calibration, the record is printed. Multi 340iOperation 21 Sample printout: Calibration evaluationAfter calibrating, the measuring instrument automatically evaluates the calibration. The asymmetry and slope are evaluated separately. The worst evaluation appears on the display. CALIBRATION PROTOCOL 02.03.01 14:19 Device No.: 12345678 Calibration pH Cal time: 01.03.01 / 15:20 Cal interval: 7d AutoCal TEC Tauto Buffer 1 2.00 Buffer 2 4.01 Buffer 3 7.00 * Buffer 4 10.00 C1 184.1 mV 25.0°C C2 3.0 mV 25.0°C S1 -59.4 mV/pH ASY1 - 4 mV Probe: +++ Display Asymmetry [mV]Slope [mV/pH] - 15 ... + 15 -60.5 ... -58 - 20 ... + 20 -58 ... -57 - 25 ... + 25 -61 ... -60.5 or -57 ... -56 Clean the electrode according to the electrode operating manual- 30 ... + 30 -62 ... -61 or -56 ... -50 E3 Eliminate the error according to chapter 6 W HAT TO DO IF... < - 30 or > 30... -62 or ... -50 OperationMulti 340i 22 Preparatory activities AutoCal TECFor this procedure, use any two WTW technical buffer solutions (pH values at 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. Note The buffer solutions are automatically recognized by the measuring in- strument. Depending on the instrument setting (see section 4.8 C ONFIGURATION ), the instrument displays the relevant buffer nomi- nal value or the current electrode voltage in mV. Note Skip the steps 2 and 7 if you use a pH electrode with temperature sen- sor or the temperature sensor of a conductivity measuring cell or a D. O. probe. Starting the calibration 1 Connect the pH electrode to the measuring instrument. If necessary, press the key repeatedly until the status dis- play pH (pH measurement) or U (measurement of the ORP voltage) appears. 2 Keep the buffer solutions ready. 3 Adjust the temperature of the solution and measure the current temperature if the measurement is made without the use of a temperature sensor (the TP display indicator is missing from the display). 1 Press the key. The Ct1 display and the function display AutoCal TEC appears. The sensor symbol displays the evalu- ation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameter has been reset). Multi 340iOperation 23 Note At this point, the AutoCal TEC calibration can be terminated with . This corresponds to a single-point calibration. To do this, the instru- ment uses the Nernst slope (-59.2 mV/pH at 25°C) and determines the asymmetry of the electrode. 2 If required, enter the temperature of the first buffer solution, while keeping the key depressed, using <
> <>. 3 Immerse the pH electrode in the first buffer solution. 4 Press the key. The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value ap- pears on the display. Example: 5 When the measured value is stable, Ct2 appears. /pH mV TDS O U Tref20 Cal 8 S 1 Sal % mg/l 1/cm Sal AutoCal DIN Lin Tref25 nLF RCL Auto Store LoBat ARng AR Time Baud Day.Month No.Ident Year mbar cm M °F /K % S/ m cm 8 4 2 t 1 °C TP pH C AutoCal TEC cm 3 7 °F 0 Cal Tref20 Lin 0 Cal Tref25 ARng AutoCal DIN Tref25 Auto AutoCal DIN ARng Tref20 Lin F cm1/ 1/ cm AR AR RCL RCL O O UpH UpH Sal Sal Store Store Auto LoBat LoBat nLF nLF Sal Sal % % mg/l mg/l mV/pH mV/pH cm ° m mS/ S/ cm cm % %/ /K K M M TDS TDS 1 1 S S mbar mbar Time Baud Day.Month No.Ident Year Time Baud Day.Month No.Ident Year 0 0 37 pH pH C °C ° AutoCal TEC AutoCal TEC AR AR mV 88 44 22 TP TP /pH mV TDS O U Tref20 Cal 8 S 1 Sal % mg/l 1/cm Sal AutoCal DIN Lin Tref25 nLF RCL Auto Store LoBat ARng AR Time Baud Day.Month No.Ident Year mbar cm M °F /K % S/ m cm 8 4 2 t 2 °C TP pH C AutoCal TEC OperationMulti 340i 24 6 Thoroughly rinse the electrode with distilled water. 7 If required, enter the temperature of the first buffer solution, while keeping the key depressed, using <
> <>. 8 Immerse the pH electrode in the second buffer solution. 9 Press the key. The AR display indicator flashes. The electrode voltage (mV) or the buffer nominal value ap- pears on the display. Example: 10 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. 11 Press the key. The value of the asymmetry (mV) appears on the display. 1 TDS S °F 0 Cal Tref20 Lin 0 Cal Tref25 ARng AutoCal DIN Tref25 Auto AutoCal DIN ARng Tref20 Lin F cm1/ 1/ cm AR AR RCL RCL O O UpH UpH Sal Sal Store Store Auto LoBat LoBat nLF nLF Sal Sal % % mg/l mg/l mV/pH mV/pH cm cm ° m mS/ S/ cm cm % %/ /K K M M TDS 1 S mbar mbar Time Baud Day.Month No.Ident Year Time Baud Day.Month No.Ident Year 88 44 0 8 1 44 pH pH C °C ° AutoCal TEC AutoCal TEC AR AR mV 1 22 TP TP O L S RCL Sal cm AutoCal DIN Day.Month S Tref20 Cal IdentNo. Year Time Baud 1 TDS Sal Store AR Tref25 cm C /% KTP ° M mbar 1/ % m mg/l cm S/ Lin O U nLF Auto LoBat ARng °F 9 4 pH 5 mV/pH AutoCal TEC Multi 340iOperation 25 12 Switch to the measuring mode with . Y A S 0 RCL Sal cm AutoCal DIN TimeDay.Month Sal Store AR 8 No.Ident Tref20 Tref25 Year Baud cm C /% KTP ° M mbar 1/ % m mg/l cm S/ TDS 6 Lin Cal 1 S O U nLF Auto LoBat ARng °F 2 pH mV AutoCal TEC OperationMulti 340i 26 4.3 Dissolved oxygen 4.3.1 General information Note D. O. measurements with the Multi 340i can only be carried out using a CellOx 325 or StirrOx G D. O. probe. The stirrer of the StirrOx G D. O. probe has to be supplied with voltage separately using the NT/pH Mix 540 power supply. You can measure the following variables:
D. O. concentration
D. O. saturation The measuring instrument is supplied with the following functions:
AutoRange (automatic switchover of the measurement range),
The AutoRead function (drift control) for checking the stability of the measurement signal. This ensures the reproducibility of the measur- ing signal. For details of how to switch the AutoRead function on/off, see page 29. Warning When connecting an earthed PC/printer, measurements cannot be per- formed in earthed media as incorrect values would result. The RS 232 interface is not galvanically isolated. Preparatory activitiesPerform the following preparatory activities when you want to measure: Note Incorrect calibration of D. O. probes will result in incorrect measured values. Calibrate at regular intervals. Temperature sensorThe D. O. probe has an integrated temperature sensor that always measures the current temperature of the test sample. 1 Connect the D. O. probe to the measuring instrument. The in- strument automatically switches over to D. O. measurement (O 2 status display). If the D. O. probe is already connected, press the repeat- edly until the O 2 status display appears. 2 Calibrate or check the measuring instrument with the sensor. How to calibrate is described in section 4.3.5 from page 20. 3 Use <
> <> to toggle between the measuring modes, D. O. concentration (mg/L) and D. O. saturation (%). Multi 340iOperation 27 4.3.2 Measuring the D. O. concentration When measuring the concentration of test samples with a salt content of more than 1 g/l, a salinity correction is required. Note How to enter the current salt content is described in section 4.3.6 S ALT CONTENT CORRECTION on page 33. Switching the salt content correction on or off, see below. To measure the D. O. concentration with and without salt content cor- rection, proceed as follows: Switching on/off the salt content correctionProceed as follows to switch on the salt content correction: 1 Perform the preparatory activities according to section 4.3.1. 2 Immerse the D. O. probe in the test sample. 3 Press the <
> <> key repeatedly until the D. O. concentra- tion in mg/l appears on the display. RCL cm cm M m S/ % /pH mV pH U TDS Tref20 Cal 8 S 1 Sal 1/cm Sal AutoCal DIN Lin Tref25 nLF AutoCal TEC Auto Store LoBat AR Time Baud Day.Month No.Ident Year mbar °F /K % 6 7 1 9 2 °C TP 7 O mg/l ARng 1 Perform the preparatory activities according to section 4.3.1. 2 Immerse the D. O. probe in the test sample. 3 While pressing the key, switch on the salt con- tent correction with <
> . The SAL display indicator appears on the display. The specified salt content is taken into consid- eration during the measurement. OperationMulti 340i 28 4.3.3 Measuring the D. O. saturation You can measure the D. O. saturation as follows: 4 While pressing the key, switch off the salt con- tent correction with <>. The SAL display indicator is no longer displayed. 1 Perform the preparatory activities according to section 4.3.1. 2 Immerse the D. O. probe in the test sample. 3 Press the <
> <> key repeatedly until the D. O. saturation in % appears on the display. cm M cm 8 LoBat Time Baud Day.Month No.Ident Year % mbar 1 S RCL AR Store Auto Cal °F 1/ / K % TDS UpH Sal mV/pH S/ m cm Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 7 1 4 2 5 O °C mg/l TP Sal ARng Auto Sal mg/l cm M cm 8 LoBat Time Baud Day.Month No.Ident Year mbar 1 S RCL AR Store Cal °F 1/ / K % TDS UpH Sal mV/pH S/ m cm Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 7 1 9 2 8 O °C TP % ARng Multi 340iOperation 29 4.3.4 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. CriteriaWith identical measurement conditions, the following applies: 1 Call up the measuring mode with and/or <
> <> . 2 Activate the AutoRead function with . The current mea- sured value is frozen (hold function). 3 Start AutoRead with . AR flashes until a stable measured value is reached. This mea- sured value is transmitted to the interface. 4 If necessary, start the next AutoRead measurement with . 5 To terminate the AutoRead function: Press the key. 8 LoBat Time Baud Day.Month No.Ident Year Sal % mbar 1 S RCL Store Auto Cal °F 1/cm /K % TDS UpH Sal mV/pH S/ m cm cm M Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 7 1 0 8 O °C mg/l TP ARng AR 7 Measuring mode Reproducibility Response time D. O. concentra- tionBetter than 0.05 mg/l > 10 seconds D. O. saturation in- dexBetter than 0.6 % > 10 seconds OperationMulti 340i 30 4.3.5 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. When to calibrate?
After connecting another D. O. probe
When the probe symbol flashes (after the calibration interval has ex- pired). Calibration procedureThe calibration is performed in water vapor-saturated air. Use the OxiCal ®-SL air calibration vessel (accessories) for the calibration. AutoReadThe calibration procedure automatically activates the AutoRead func- tion. The AR display indicator flashes. The calibration process is fin- ished when AR stops flashing. Displaying the calibra- tion dataYou can view the data of the last calibration on the display. The pro- ceeding is described on page 48. Printing the calibration protocolThe calibration record contains the calibration data of the current cali- bration. You can transmit the calibration protocol to a printer via the se- rial interface (see page 51). Note You can automatically print a calibration record after the calibration. To do so, connect a printer to the interface according to section 4.7.2 be- fore calibrating. After a valid calibration, the record is printed. Sample printout: CALIBRATION PROTOCOL 02.03.01 14:19 Device No.: 12345678 CALIBRATION 02 Cal time: 02.03.01 / 14:19 Cal interval: 14d OxiCal Tauto AR Relative Slope: 0,88 Probe: +++ Multi 340iOperation 31 Probe evaluationAfter the calibration, the measuring instrument evaluates the current status of the probe against the relative slope. The evaluation appears on the display. The relative slope has no effect on the measuring accu- racy. Low values indicate that the electrolyte will soon be depleted and the probe will have to be regenerated. Starting the calibrationProceed as follows to calibrate the instrument: Note The sponge in the air calibration vessel must be moist (not wet). Follow the instructions in the OxiCal ®-SL operating manual. Display Relative slope S = 0.8 ... 1.25 S = 0.7 ... 0.8 S = 0.6 ... 0.7 E3 Eliminate the error according to chapter 6 W HAT TO DO IF... S < 0.6 or S > 1.25 1 Perform the preparatory activities according to section 4.3.1. 2 Keep the OxiCal ®-SL air calibration vessel ready. 3 Put the D. O. probe into the air calibration vessel. 4 Press the 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). OperationMulti 340i 32 Note In chapter 6 W HAT TO DO IF... page 65, you will find the measures to take for error elimination. 5 Press the key. AutoRead is active, AR flashes. 6 As soon as a stable value is reached, the AR display indicator stops flashing. The calibration is finished now. The value of the relative slope appears on the display. The probe symbol shows the probe evaluation (see page 31). 7 Switch to the measuring mode with . % Auto ARng Sal mg/l cm M cm 8 LoBat Time Baud Day.Month No.Ident Year mbar 1 S RCL AR Store °F 1/ / K % TDS UpH Sal mV/pH S/ m cm Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 7 1 A L C O °C TP Cal mg/l 8 LoBat Time Baud Day.Month No.Ident Year Sal % mbar 1 1/cm TDS UpH Sal mV/pH S/ m cm cm M Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 7 1 8 8 0 O Cal AR S ARng mg/l 8 LoBat Time Baud Day.Month No.Ident Year Sal % mbar 1 RCL Store Auto °F 1/cm /K % TDS UpH Sal mV/pH S/ m cm cm M Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 7 1 8 8 0 O °C TP Cal AR S Multi 340iOperation 33 4.3.6 Salt content correction A salt content correction is required in the oxygen concentration mea- surement of samples with a salt content of more than 1 g/l. To do this, you have to enter the salinity equivalent of the test sample (range 0.0 - 70.0) and to switch on the salinity correction. Note With the Multi 340i handheld meter, you can measure the salinity. How to proceed is described in section 4.4.3 M EASURING THE SALINITY on page 36. Entering the salt con- tent Note How to switch on the salt content correction is described on page 27. 1 Determine the salinity of the test sample (any method, see also section 4.4.3 M EASURING THE SALINITY on page 36). 2 Press the key repeatedly until Sal appears on the dis- play. 3 Enter the salt content with <
> <>. 4 Switch to the measuring mode with . °C TP cm M cm 8 LoBat Time Baud Day.Month No.Ident Year % mbar 1 S RCL AR Store Auto Cal °F 1/ / K % TDS UpH Sal mV/pH S/ m cm Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 6 9 6 5 5 O mg/l ARng Sal 0 OperationMulti 340i 34 4.4 Conductivity 4.4.1 General information Note Conductivity measurements with the Multi 340i 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. The RS232 interface is not galvanically isolated. Preparatory activitiesPerform the following preparatory activities when you want to measure: Temperature probeThe TetraCon 325 conductivity measuring cell has a temperature sen- sor integrated in it. The temperature sensor is shown on the display by TP. Temperature compensationThe nonlinear temperature compensation is set fixed and is shown on the display by nLF. Reference temperature, Tr e fThe reference temperature (Tref) can be switched between 20°C and 25°C. It appears on the display as Tref20 or Tref25. To switch over the reference temperature, see S WITCHING OVER THE REFERENCE TEMPERA - TURE , page 58. 1 Connect a conductivity measuring cell to the measuring instru- ment. The instrument automatically switches over to conductiv- ity measurement (status display ). If the conductivity measuring cell is already connected, press the key repeatedly until the status display or Sal ap- pears. 2 Check the selected cell constant or calibrate the measuring in- strument with the measuring cell (see below). 3 Check the selected cell constant (see below) or calibrate the measuring instrument with the measuring cell (see section 4.4.5 on page 38). 4Using <
> <>, toggle between the measuring modes, con- ductivity ( in µS/cm) or salinity (SAL). Multi 340iOperation 35 Checking the cell constant 1 Press the key repeatedly until CAL disp appears on the display. 2 Press the repeatedly until the last calibrated cell constant is displayed, e. g. 0.472 1/cm. 3 To return to the measuring mode: Press the key when the correct cell constant is displayed. 4 If you want to recalibrate the cell constant, proceed according to section 4.4.5 D ETERMINING THE CELL CONSTANT (C ALIBRATION IN THE CONTROL STANDARD ) . O UpH Sal Store AR Auto AutoCal DIN AutoCal TEC LoBat Cal ARng Tref25 Tref20 Lin nLF Sal % mg/l mV/pH cm °° TP m S/ cm cm 1/ FC%/K M TDS 1 S mbar Time Baud Day.Month No.Ident Year P dSI RCL A L C L C S 1 LoBat Lin nLF Tref20 ARng AR °° TP FC%/K M % mg/l mV/pH m S/ cm Sal TDS Auto Store Sal mbar O UpH cm AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year 2 074 cm1/ Tref25 RCL C Cal OperationMulti 340i 36 4.4.2 Measuring the conductivity You can carry out the conductivity measurements as follows: 4.4.3 Measuring the salinity You can carry out the salinity measurements as follows: 1 Perform the preparatory activities according to section 4.4.1 page 34. 2 Immerse the conductivity measuring cell in the test sample. 3 Press the <
> <> keys until in the status display, and the unit µS/cm appears. The conductivity value appears on the dis- play. 1 Perform the preparatory activities according to section 4.4.1 page 34. 2 Immerse the conductivity measuring cell in the test sample. 3 Press the <
> <> keys until the Sal status display appears. The salinity value appears on the display. AR 8 1 cm1/ / K % °F RCL Cal Lin Tref20 LoBat M m Sal TDS S Auto Store Sal mbar % mg/l O UpH mV/pH cm AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year 0 4 2 3 0 5 ° TP S/ cm C Tref25 nLF ARng Tref25 /K cm1/ °F % 8 mg/l 1 RCL ARng AR LoBat Cal Tref20 Lin m S/ cm M TDS S Auto Store Sal mbar % O UpH mV/pH cm AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year 2 1 2 2 3 3 ° TP Sal C nLF Multi 340iOperation 37 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. Note The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing . You can only change to another measuring mode after completion of AutoRead. 1 Call up the or SAL measuring mode with and/or <
> <>. 2 Immerse the conductivity measuring cell in the test sample. 3 Activate the AutoRead function with . The current mea- sured value is frozen (hold function). 4 Start AutoRead with . AR flashes until a stable measured value is reached. This measured value is transmitted to the interface. 5 If necessary, start the next AutoRead measurement with . 6 To terminate AutoRead: Press the key. 8 1 cm1/ / K % °F RCL Cal Lin Tref20 LoBat M m Sal TDS S Auto Store Sal mbar % mg/l O UpH mV/pH cm AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year 0 5 2 3 0 5 ° AR TP S/ cm C Tref25 nLF ARng OperationMulti 340i 38 4.4.5 Determining the cell constant (Calibration in the control standard) Why determine the cell constant?Aging slightly changes the cell constant, e. g. by coatings. As a result, an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell. Calibration deter- mines the current value of the cell constant and stores this value in the instrument. Thus, you should calibrate at regular intervals. In the delivery condition, the cell constant of the measuring instruments is set to 0.475 cm -1 (conductivity measuring cell TetraCon 325). AutoReadThe calibration procedure automatically activates the AutoRead func- tion. The AR display indicator flashes. The calibration process is fin- ished when AR stops flashing. Displaying the calibra- tion dataYou can view the data of the last calibration on the display. The pro- ceeding is described on page 48. Printing the calibration protocolThe calibration record contains the calibration data of the current cali- bration. You can transmit the calibration protocol to a printer via the se- rial interface (see page 51). Note You can automatically print a calibration record after the calibration. To do so, connect a printer to the interface according to section 4.7.2 be- fore calibrating. After a valid calibration, the record is printed. Sample printout: CALIBRATION PROTOCOL 14.04.01 11:37 Device No.: 99990000 Calibration Conductivity Cal time: 14.04.01 / 11:37 Cal interval: 180d Cal Std.: 0.01 mol/l KCL 40.0°C Conduct./Tref25: 1413µS/cm Cell Const : 0.478 1/cm Probe : +++ Multi 340iOperation 39 Calibration evaluationAfter the calibration, the measuring instrument automatically evaluates the current status of the calibration. The evaluation appears on the dis- play. Determining the cell constantYou can determine the cell constant (conductivity measuring cell Tetra- Con 325) as follows: Display Cell constant [cm -1] 0.450 ... 0.500 cm -1 E3 Eliminate the error according to chapter 6 W HAT TO DO IF... Outside the range 0.450 ... 0.500 cm -1 1 Press the key repeatedly until the status display CAL CELL appears. 2 Press the key. The CAL display appears, as well as –the current, calibrated cell constant (with sensor symbol on the display) or –the fixed cell constant 0.475 1/cm (without sensor symbol on the display). In this case, the measurement parameters are initialized (see section 4.9 R ESET ). 3 Immerse the conductivity measuring cell in the control standard solution, 0.01 mol/l KCI. 4 Press the 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 constants. AR AR RCL RCL O O UpH UpH Sal Sal Store Store Auto Auto AutoCal DIN AutoCal DIN AutoCal TEC AutoCal TEC LoBat LoBat ARng ARng Tref20 Tref20 Lin Lin nLF nLF Sal Sal % % mg/l mg/l mV/pH mV/pH cm cm ° °° ° TP TP m mS/ S/ cm cm F FC C% %/ /K K M M TDS TDS 1 1 S S mbar mbar Time Baud Day.Month No.Ident Year Time Baud Day.Month No.Ident Year 5 2 0 0774 4 A A L LC C cm cm1/ 1/ Tref25 Tref25 Cal Cal OperationMulti 340i 40 Note If the error message E3 E3E3 E3 appears, refer to chapter 6 W HAT TO DO IF... 5 To return to the measuring mode: Press the key. The de- termined cell constant is taken over for the measurement. S 1 LoBat Lin nLF Tref20 RCL ARng AR °° TP FC%/K M % mg/l mV/pH m S/ cm Sal TDS Auto Store Sal mbar O UpH cm AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year 3 074 Cal cm1/ Tref25 A L C AR Multi 340iOperation 41 4.5 Calibration intervals (Int 3, Int 4, Int 5) For each measured variable, a time interval is stored. When it has ex- pired, you will be reminded to calibrate. After a calibration interval has expired, the probe symbol of the relevant measured variable flashes. It is still possible to measure. By calibrating the relevant probe, the func- tion is reset and the interval starts anew. The following calibration intervals are set in the factory: Setting the calibration intervalYou can change each of these intervals (1 ... 999 days): Measured parameter Designation Default setting pH/ORPInt 37 days Dissolved oxygenInt 414 days ConductivityInt 5180 days 1 Switch off the measuring instrument. 2 Press the key and hold it down. 3 Press the key. The display test appears briefly on the display. After this, the measuring instrument automatically switches over to configu- ration. 4 Press the key repeatedly, until Int 3 ... 5 to- gether with the required measured variable (pH, O 2 or ) ap- pears on the display. Example: 5 Set the required interval until the next calibration with <
> <>. 6 Confirm with . 7 Switch to the measuring mode with . °C 1 TP ARng mg/l LoBat Baud Day.Month No.Ident Year Sal % mbar S RCL AR Store Auto °F 1/cm /K % TDS UpH Sal mV/pH S/ m cm cm M Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 4 1 t 4 n O 1 d Time Cal OperationMulti 340i 42 4.6 Saving data The Multi 340i portable measuring instrument has an internal data memory. It can store up to 500 datasets. A complete data record consists of:
Number of the storage location
Date/time
Measured values of the probes connected
Temperature values of the probes connected
Temperature measuring procedure
ID number You can transmit measured values (data records) to the data storage in two ways:
Save manually
Switch on AutoStore (Int 1), see page 44) 4.6.1 Saving manually You can transmit a measured value to the data storage as follows: 1 Press the key. The current number (location number No.) of the next free stor- age location appears under the current measured value on the display. 2 Confirm with . The display switches to entering the ID number. Ident KTP °C 4 2 Tref20 Lin Cal 8 1 S Sal O U % mg/l mV/pH 1/cm Sal AutoCal DIN Tref25 nLF AutoCal TEC RCL Auto LoBat ARng AR Time Baud Day.MonthYear mbar TDS cm M °F /% S/ m cm 4 9 9 6 pH No. Store Multi 340iOperation 43 Message StoFull StoFullStoFull StoFull This message appears when all of the 500 storage locations are occu- pied. You have the following options: 3 Using <
> <>, enter the required ID number (1 ... 999). 4 Confirm with . The measured values are stored. The instrument changes to the measuring mode. No. KTP °C 4 2 Tref20 Lin Cal 8 1 S Sal O U % mg/l mV/pH 1/cm Sal AutoCal DIN Tref25 nLF AutoCal TEC RCL Auto LoBat ARng AR Time Baud Day.MonthYear mbar TDS cm M °F /% S/ m cm 2 9 9 6 pH Store Ident Saving the current measured value. The oldest measured value (storage location 1) will be overwritten by thisPress Returning to the measuring mode without saving press any key Outputting the data storage see section 4.6.3 Clearing the memory see section 4.6.4 OperationMulti 340i 44 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. Switching on AutoStore 1 Press the key and hold it down. 2 Press the key. Int 1 appears on the display. 3 Set the required interval between the saving procedures with <
> <> (Selection: 5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min). 4 Confirm with . The number of free memory locations appears on the display. 5 Confirm with . The prompt for the ID number appears on the display. LoBat Tref25 nLF /K % RCL Sal ° AR TP C M m % mg/l cm S/ cm S 8 cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year F F O t 1 n 1 Store Auto S 1 LoBat Tref25 nLF /K % RCL Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year e e r 9 9 4 Store Auto F Multi 340iOperation 45 As soon as all of the 500 storage locations are occupied, AutoStore is terminated (Int 1 = OFF). If there are not enough storage locations available for your measurements:
Output and backup the data storage (see page 46) and
clear the memory (see page 52). Note The AutoStore function is interrupted if you start other functions, e. g. output the data storage. After the other function is finished, the Au- toStore function is continued. By this, however, temporal gaps in the re- cording of the measured values will occur. Switching off AutoStoreSwitch AutoStore off by:
setting the save interval (Int 1) to OFF, or
switching the measuring instrument off and then on again. 6 Set the required ID number with <
> <>. 7 Confirm with . The measuring instrument switches to the last active measur- ing mode and start the measuring and saving procedure. Au- toStore flashes on the display. e r F 9 9 9 S 1 LoBat Tref25 nLF /K % RCL Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No. Year 1 Store Auto Ident OperationMulti 340i 46 4.6.3 Outputting the data storage You can output the contents of the data storage:
Stored data on the display
Calibration data on the display
Stored data on the serial interface
Calibration protocol to the interface Outputting stored data on the display You can perform the following activities: 1 Press the key repeatedly until StO dISP appears on the display. 2 Press the key. A measured value appears on the display. The storage location of the data record is displayed for approx. 2 s, then the respective temperature appears. Display further data of the data record (ID number, date, time, storage location)Press To toggle between two saved measured vari- ablesPress + Advance one data record (storage location) Press <
> Go back one data record (storage location) Press <> Store Auto Ident S 1 LoBat Tref25 nLF /K % Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No. Year p ST O dI s RCL ARng No. Store Auto %/K Sal 1/cm °F 8 %mV/pH m S/ cm cm M Sal LoBat Time Baud Day.Month Ident Year mbar 1 S AR Cal TDS UpH Lin Tref25 Tref20 nLF AutoCal DIN AutoCal TEC 0 3 6 O mg/l RCL TP °C 5 2 0 Multi 340iOperation 47 Note If you want to search for a certain element of the data record (e. g. date), proceed as follows: Outputting stored data to the interface Note You can cancel the transmission with or . The transmitted data contains the entire contents of the storage in in- crementing order of the location numbers. 1 Using , select the element (e. g. date). 2 Press <
> or <> repeatedly until the required element ap- pears on the display. After approx. 2 s the temperature of the displayed measured value appears. 1 Press the key repeatedly until Sto SEr appears on the display. 2 Press the key. The complete contents of the storage are transmitted to the in- terface. During the data transmission the instrument incre- ments the storage numbers. After the data transmission, the instrument automatically switches to the last active measure- ment mode. Store Auto Ident S 1 LoBat Tref25 nLF /K % Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No. Year R St o S E RCL OperationMulti 340i 48 Sample printout: Outputting the calibra- tion data on the display No. 1: 09.03.01 17:10 pH 10.01 25°C Tauto AR Ident : 47 No. 2: 09.03.01 17:12 305 mV Tauto Ident : 6 No. 3: 09.03.01 17:24 7.88 mg/l 17.6°C Tauto Ident : 81 No. 4: 09.03.01 17:46 7.11 mg/l 17.8°C Tauto SAL = 17.9 Ident : 4 No. 5: 10.03.01 19:09 2.40 mS/cm 25.3°C Tauto nLF Tref25 C = 0.475 1/cm Ident : 10 No. 6: 10.03.01 20:48 2.46 mS/cm 25.6°C Tauto nLF Tref25 C = 0.475 1/cm Ident : 1 ... 1 Press the key repeatedly until CAL disp appears on the display. Store Auto Ident S 1 LoBat Tref25 nLF /K % Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No. Year dP CA L I S RCL Multi 340iOperation 49 2 Press the key. The data of the last calibration of all measured variables ap- pears in the following sequence:
pH: Slope SLO and asymmetry ASY
Dissolved oxygen: Relative slope SLO
Cond: Cell constant C Information concerning the calibration procedure is output as well. 3 Press to display the value of the asymmetry (mV). 4 Press to display the relative slope of the D. O. probe. Sal cm AutoCal DIN Day.Month S Tref20 Cal IdentNo. Year Time Baud 1 TDS Sal Store AR Tref25 cm C /% KTP ° M mbar 1/ % m mg/l cm S/ Lin O U nLF AutoCal TEC Auto LoBat ARng °F O 9 4 pH L S RCL 5 mV/pH Sal cm AutoCal DIN TimeDay.Month Sal Store AR 8 No.Ident Tref20 Tref25 Year Baud cm C /% KTP ° M mbar 1/ % m mg/l cm S/ TDS 6 Lin Cal 1 S O U nLF AutoCal TEC Auto LoBat ARng °F Y 0 1 pH mV S A RCL Cal Day.Month 2 S Store Auto Ident 1 LoBat Tref25 nLF /K % Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Lin Tref20 Sal TDS mbar UpH mV/pH AutoCal DIN AutoCal TEC Time BaudNo. Year O 08 8 S L RCL O OperationMulti 340i 50 5 Press to display the cell constant. The dis- played value is:
the current, calibrated cell constant (with sensor symbol on the display) or
the fixed cell constant 0.475 1/cm (without probe symbol on the display). In this case, the measured parameters are ini- tialized (see section 4.9 R ESET ). 6 With you can switch back to the last active measuring mode. Day.Month Cal 4 8 S cm Sal O Store Auto Ident 1 LoBat nLF /K %° AR TP C M m % mg/l S/ cm °F ARng Lin Tref20 Sal TDS mbar UpH mV/pH AutoCal DIN AutoCal TEC Time BaudNo. Year 08 C 4 7 RCL cm1/ Tref25 Multi 340iOperation 51 Outputting the calibra- tion protocol on the interface Sample printout: 1 Press the key repeatedly until CAL SEr appears on the display. 2 Press the key. The calibration protocol for all measured variables is transmit- ted to the interface. After the data transmission, the instrument automatically switches to the last active measurement mode. d Store Auto Ident S 1 LoBat Tref25 nLF /K % Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No. Year R CA L S E RCL CALIBRATION PROTOCOL 02.03.01 14:19 Device No.: 12345678 Calibration pH Cal time: 01.03.01 / 15:20 Cal interval: 7d AutoCal TEC Tauto Buffer 1 2.00 Buffer 2 4.01 Buffer 3 7.00 * Buffer 4 10.00 C1 174.1 mV 25.0°C C2 -133.3 mV 25.0°C S1 -59.4 mV/pH ASY1 - 4 mV Probe: +++ CALIBRATION 02 Cal time: 02.03.01 / 14:19 Cal interval: 14d OxiCal Tauto AR Relative Slope: 0,88 Probe: +++ Calibration Conductivity Cal time: 14.12.00 / 11:37 Cal interval: 180d Cal Std.: 0.01 mol/l KCL 40.0°C Conduct./Tref25: 1413µS/cm Cell Const : 0.478 1/cm Probe : +++ OperationMulti 340i 52 4.6.4 Clearing the memory With this function, you can delete the stored data records. 500 storage locations will then be available again. Note The Clear memory function only appears when there are data records stored in the memory. Otherwise, the measuring instrument automati- cally switches to the last active measuring mode. Proceed as follows to clear all data records: Note The calibration data remain stored and can be called up. 1 Switch off the measuring instrument. 2 Press the key and hold it down. 3 Press the key. The display test appears briefly on the display. 4 Confirm the clearing process with . Pressing any other key prevents the clearing, the data records will remain stored. Multi 340iOperation 53 4.7 Transmitting data You have the following possibilities of transmitting data:
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. –With the Data transmission interval function (Int 2), measured values are periodically output on the interface (see below). –AutoStore (Int 1) covers the Data transmission interval (Int 2).
Press the key This manually triggers a data transmission of the current measured value to the serial interface at any time - independently of the select- ed intervals.
With the Output data storage function (page 46), calibration data or saved measured values are output on the interface. 4.7.1 Data transmission interval (Int 2) The interval to the data transmission (Int 2) determines the chronolog- ical interval between automatic data transmissions. After the selected interval expires, the current data record is transmitted to the interface. Setting the Data transmission intervalThe default setting for the interval is OFF. To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min): 1 Press the key and hold it down. 2 Press the key. Int 2 appears on the display. 3 Set the required interval between the saving procedures with <
> <>. Store Auto LoBat Tref25 nLF /K % RCL Sal ° AR TP C M m % mg/l cm S/ cm S 8 cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar O UpH mV/pH AutoCal DIN AutoCal TEC Time Baud Day.Month No.Ident Year F F O t 2 n 1 OperationMulti 340i 54 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). Set the save interval (Int 1) to OFF to activate the Data transmission in- terval (Int 2). 4 Confirm with . The measuring instrument switches to the last active measur- ing mode. Multi 340iOperation 55 4.7.2 PC/external printer (RS 232 interface) Via the RS 232 interface, you can transmit the data to a PC or an ex- ternal printer. Use the AK 340/B (PC) or AK 325/S (ext. printer) cable. Warning The RS232 interface is not galvanically isolated. When connecting an earthed PC/printer, measurements cannot be per- formed in earthed media as incorrect values would result. Set up the following transmission data on the PC/printer: Socket assignment 4.7.3 Remote control The handheld meter can be remotely controlled from a PC. This re- quires the KOM pilot communication kit. It is available as an accessory. The instrument is then controlled via commands that simulate key- strokes and request the current display contents. Note A more detailed description is provided within the scope of delivery of the communication kit. Baud rate can be selected from: 1200, 2400, 4800, 9600 Handshake RTS/CTS + Xon/Xoff PC only: Parity none Data bits 8 Stop bits 2 1 CTS 2 RxD 3 Ground 4TxD 12 3 4 RS 232 REC OperationMulti 340i 56 4.8 Configuration You can adapt the handheld meter to your individual requirements. To do this, the following parameters can be changed (the status on deliv- ery is marked in bold): Note You can leave the configuration menu at any time with . The pa- rameters that have already been changed are stored. BaudrateBaud rate 1200, 2400, 4800, 9600 Air pressure display Current value in mbar (no input possible) Calibration intervals–pH 1 ... 7 ... 999 dInt 3 –O 2 1 ... 14 ... 999 dInt 4 –: 1 ... 180 ... 999 dInt 5 Date/time Any 1 Switch off the measuring instrument. 2 Press the key and hold it down. 3 Press the key. The display test appears briefly on the display. The measuring instrument then switches automatically to the setting of the baud rate. 4 Select the required Baud rate with <
> <>. 5 Confirm with . CAL dISP appears on the dis- play. Day.Month No. Time12 M m % mg/l cm S/ cm S mbar mV/pH t n Store Auto LoBat Tref25 nLF /K % RCL Sal ° AR TP C cm1/ °F ARng Cal Lin Tref20 Sal TDS O UpH AutoCal DIN AutoCal TEC Ident Year 0 0 8 4 Baud Multi 340iOperation 57 Displaying the air pressureThe air pressure is only displayed if an oxygen sensor is connected. Otherwise, "---" appears. pH calibration interval 6 Select the required display during the pH calibration with <
> <>. mV: Display of the current electrode voltage /pH: Display of the buffer nominal value. 7 Confirm with . P mbar appears on the display. RCL mV/pH O Store Auto Ident S 1 LoBat Tref25 nLF /K % Sal ° AR TP C M m % mg/l cm S/ cm cm1/ °F ARng Cal Lin Tref20 Sal TDS mbar AutoCal DIN AutoCal TEC Time Baud Day.Month No. Year p CA L i s d pH /pH 8 Confirm with . Int 3 and the measured variable pH appear on the display. Baud 4 Day.Month No. Time1 M m % mg/l cm S/ cm S mV/pH t n Store Auto LoBat Tref25 nLF /K % RCL Sal ° AR TP C cm1/ °F ARng Cal Lin Tref20 Sal TDS O UpH AutoCal DIN AutoCal TEC Ident Year 9 4 9 mbar P 9 Set th