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Overview

Multi 3430

ba75865e19

04/2015

Overview

The compact, digital precision meter Multi 3430 enables you to carry
out pH measurements, ORP measurements, conductivity measure-
ments, dissolved oxygen (D.O.) measurements and turbidity measure-
ments quickly and reliably.

The Multi 3430 provides the maximum degree of operating comfort,
reliability and measuring certainty for all applications.

The Multi 3430 supports you in your work with the following functions:



proven calibration procedures



automatic stability control (AR),



automatic sensor recognition,



CMC (continuous measurement control)



QSC (sensor quality control).

1 Keypad
2 Display
3 Socket field

Содержание WTW Multi 3430

Страница 1: ...OPERATING MANUAL ba75865e19 04 2015 Multi 3430 DIGITAL METER FOR DIGITAL IDS SENSORS...

Страница 2: ...015 WTW GmbH Reproduction in whole or even in part is prohibited without the express written permission of WTW GmbH Weilheim Printed in Germany The latest version of the present operating manual is av...

Страница 3: ...0 3 3 2 Connecting the power pack charging the batteries 20 3 3 3 Switching on the meter 21 3 3 4 Setting the date and time 22 4 Operation 23 4 1 Switching on the meter 23 4 2 Login with a user name 2...

Страница 4: ...General information 64 4 9 2 Measuring 65 4 9 3 Settings for D O sensors menu or measurement and calibration settings 67 4 9 4 FDO Check procedure check of the FDO 925 70 4 9 5 D O calibration 72 4 9...

Страница 5: ...USB A USB printer interface 109 4 14 5 Data transmission to the USB A interface USB memory device 110 4 14 6 MultiLab Importer 111 4 15 MultiLab User 111 4 16 Reset 111 4 16 1 Resetting the measuremen...

Страница 6: ...Multi 3430 6 ba75865y19 04 2015 9 2 Firmware Update for IDS Sensors 132...

Страница 7: ...bidity measure ments quickly and reliably The Multi 3430 provides the maximum degree of operating comfort reliability and measuring certainty for all applications The Multi 3430 supports you in your w...

Страница 8: ...e under 2 sec in this operating manual A long keystroke approx 2 sec is indicated by the underscore behind the key symbol e g MENU ENTER_ 1 2 3 F1 F2 Softkeys providing situation dependent functions e...

Страница 9: ...tings Confirms entries Opens the menu for system settings PRT PRT_ Outputs stored data to the interface Outputs displayed data to the interface in intervals ESC Cancels an action MENU ENTER MENU ENTER...

Страница 10: ...lue is frozen AR key Batteries are almost empty Mains operation Mains operation with charge function Batteries are automatically charged in the back ground Data are automatically output to the USB B i...

Страница 11: ...annot return any voltages or currents that are not allowed SELV and current circuit with current limiting WTW IDS sensors and IDS adapters meet these requirements Connectors 1 Digital sensors pH ORP c...

Страница 12: ...o not concern this sensor To be able to use the automatic sensor recognition a meter that sup ports the automatic sensor recognition e g Multi 3430 and a digital IDS sensor are required In digital IDS...

Страница 13: ...cedure A message is displayed while the data are being updated in the sensor 1 6 IDS adapter for analog sensors With the aid of an IDS adapter you can also operate analog sensors on the Multi 3430 An...

Страница 14: ...Multi 3430 Overview 14 ba75865e19 04 2015...

Страница 15: ...perience the operators will know the necessary safety precautions to take when handling chemicals Safety instructions Safety instructions in this operating manual are indicated by the warn ing symbol...

Страница 16: ...left the factory in a safe and secure technical condition Function and operational safety The smooth functioning and operational safety of the meter can only be guaranteed if the generally applicable...

Страница 17: ...you are in any doubt please contact the supplier of the meter Obligations of the purchaser The purchaser of this meter must ensure that the following laws and guidelines are observed when using danger...

Страница 18: ...Multi 3430 Safety 18 ba75865e19 04 2015...

Страница 19: ...in the following ways Battery operation with NiMh rechargeable batteries Mains operation with the supplied power pack The NiMh rechargeable batteries are automatically charged while the power pack is...

Страница 20: ...ltage at the operating site must lie within the input volt age range of the original power pack see section 7 1 CAUTION Use original power packs only see section 7 1 CAUTION The batteries in the batte...

Страница 21: ...ing feature to avoid unnecessary power consumption during battery operation The energy saving feature switches off the meter during battery opera tion if no key is pressed during the adjusted interval...

Страница 22: ...Multi 3430 Commissioning 22 ba75865e19 04 2015 cable 3 3 4 Setting the date and time 3 See section 4 3 5...

Страница 23: ...on is activated by the administrator via the MultiLab User PC software see the MultiLab User operating manual Switching off Press the On Off or On Off_ key 4 2 Login with a user name After activation...

Страница 24: ...sing enter the User name menu item and confirm with MENU ENTER The user name is highlighted 3 Using select a user name and confirm with MENU ENTER 4 If a password is required Using enter the Password...

Страница 25: ...er name menu item and confirm with MENU ENTER The user name is highlighted 3 Using select a user name and confirm with MENU ENTER 4 Using enter the Change password menu item and confirm with MENU ENTE...

Страница 26: ...ion 4 3 1 and section 4 3 3 4 3 1 Operating modes The meter has the following operating modes Measuring The measurement data of the connected sensors is shown in the measured value display Calibration...

Страница 27: ...operating situation 4 3 3 Navigation Measured value display In the measured value display you can use to select one of several connected sensors The selected sensor is displayed with a colored backgr...

Страница 28: ...colon The current setting is displayed on the right hand side The setting mode is opened with MENU ENTER Subsequently the setting can be changed with and MENU ENTER Example Functions Functions are de...

Страница 29: ...ng the language section 4 3 4 Setting the date and time see section 4 3 5 Calibration record Calibration data storage Buffer TEC Single point calibration yes Calibration interval 7 d Unit for slope mV...

Страница 30: ...isplay appears The instrument is in the measuring mode 2 Open the Storage config menu with MENU ENTER_ The instrument is in the setting mode 3 Select the System submenu with The current selection is d...

Страница 31: ...t the required language with General Interface Clock function Service information Reset System 15 03 2014 08 00 Language Deutsch Acoustic signal off Volume 5 Illumination on Brightness 50 Switchoff ti...

Страница 32: ...es Therefore check the time at regular intervals Note After a fall of the supply voltage empty batteries the date and time are reset Setting the date time and date format The date format can be switch...

Страница 33: ...ate function Reset of all sensor independent system settings to the default con dition 3 Select and confirm the Time menu with and MENU ENTER The hours are highlighted 4 Change and confirm the setting...

Страница 34: ...ion on off System General Brightness 0 15 22 Changes the display bright ness System General Switchoff time 10 min 1h 24 h Adjusts the switch off time System General Temperature unit C F Temperature un...

Страница 35: ...shes on the display as soon as the measured value is outside the stability range when you switch over between the measured parameters with M System Interface Extended Oxi output The measured values fo...

Страница 36: ...storage function is active or with automatic data transmission 4 4 5 Display illumination The meter automatically switches the display illumination to energy saving mode if no key is pressed for 20 se...

Страница 37: ...th More 15 03 2014 08 00 More SenTix 940 B092500013 15 03 2014 08 00 Man temperature 25 C pH resolution 0 001 mV resolution 0 1 Buffer TEC Calibration interval 7d Unit for slope mV pH QSC SenTix 940 B...

Страница 38: ...ration and measurement settings siehe section 4 7 3 Preparatory activities Perform the following preparatory activities when you want to measure When operating a sensor without integrated temperature...

Страница 39: ...ction is pre maturely terminated the current measurement data are output to the 1 Perform the preparatory activities according to section 4 7 1 2 Immerse the IDS pH sensor in the test sample 3 Select...

Страница 40: ...ngs The settings are made in the menu for calibration and measurement settings of the pH ORP measurement To open the settings display the required parameter in the measured value display and press the...

Страница 41: ...calibrate regularly by the flashing sensor symbol in the measur ing window Calibration Unit for slope mV pH Unit of the slope The display refers to the Nernst slope of 59 2 mV pH 100 x determined slop...

Страница 42: ...a tion The pH values are valid for the specified temperature values The temperature dependence of the pH values is taken into consideration during the calibration Alternative temperature on off Takes...

Страница 43: ...454 25 C 3 TEC WTW Technical buffers 2 000 4 010 7 000 10 011 25 C 4 Merck 1 4 000 7 000 9 000 20 C 5 Merck 2 1 000 6 000 8 000 13 000 20 C 6 Merck 3 4 660 6 880 9 220 20 C 7 Merck 4 2 000 4 000 7 000...

Страница 44: ...C 15 Baker 4 006 6 991 10 008 25 C 16 Metrohm 3 996 7 003 8 999 25 C 17 Beckman 4 005 7 005 10 013 25 C 18 Hamilton Duracal 4 005 7 002 10 013 25 C 19 Precisa 3 996 7 003 8 999 25 C 20 Reagecon TEC 2...

Страница 45: ...4 7 3 Stability control The calibration procedure automatically activates the stability control function The current measurement with stability control can be termi nated at any time accepting the cur...

Страница 46: ...tion The zero point and slope are evaluated separately The worse evaluation of both is taken into account The evaluation appears on the display and in the calibration record Multi 3430 Ser no 09250023...

Страница 47: ...QSC color scale flashes It is still possible to measure Note To ensure the high measuring accuracy of the measuring system cal ibrate after the calibration interval has expired Setting the calibratio...

Страница 48: ...ion procedure is automatically finished with the measurement of buffer solution 1 and the calibration record is displayed 1 In the measured value display select the measured parameter pH or mV with M...

Страница 49: ...ext buffer appears voltage dis play 8 If necessary finish the calibration procedure as a single point cal ibration with M The calibration record is displayed 15 03 2014 08 00 9 Thoroughly rinse the ID...

Страница 50: ...ish the calibration procedure as a two point cal ibration with M The calibration record is displayed 15 03 2014 08 00 15 Thoroughly rinse the IDS pH sensor with deionized water 16 Immerse the IDS pH s...

Страница 51: ...is determined by linear regression 19 Wait for the measurement with stability control to be completed or terminate the stability control and take over the calibration value with MENU ENTER The calibr...

Страница 52: ...record is displayed 1 In the measured value display select the measured parameter pH or mV with M 2 Start the calibration with CAL The calibration display for the first buffer appears voltage dis pla...

Страница 53: ...e the stability control and take over the calibration value with MENU ENTER The pH value of the buffer solution is displayed 8 Set the nominal buffer value for the measured temperature with 9 Accept t...

Страница 54: ...rol The AR status indicator is displayed The measured parame ter flashes 15 Wait for the measurement with stability control to be completed or terminate the stability control and take over the calibra...

Страница 55: ...the measurement with MENU ENTER The measured value is checked for stability stability control The AR status indicator is displayed The measured parame ter flashes 23 Wait for the measurement with stab...

Страница 56: ...the MENU ENTER key in the measured value display Menu item Setting function Description Calibration Calibration data stor age Display Displays the calibration records Further options Scroll through t...

Страница 57: ...lid calibration is available back ground color Measured values in this range are suitable for documentation 2 Measuring range for which no valid calibration is available light gray Measured values in...

Страница 58: ...what is necessary to restore the optimum measuring quality e g clean calibrate or replace the sensor Sensor evaluation with without QSC function 15 03 2014 08 00 Info QSC color scale The double arrow...

Страница 59: ...te As soon as the QSC function was enabled for an IDS sensor it is not possible to return to the sensor evaluation with the sensor symbol for this sensor Carrying out a QSC initial calibration Note Ca...

Страница 60: ...ably changed after some normal calibrations Carrying out a QSC control calibration 4 As soon as the three point calibration has been successfully carried out you can decide whether to accept or discar...

Страница 61: ...with several sensors connected to one Multi 3430 in one test sample Preparatory activities Perform the following preparatory activities when you want to measure 4 8 2 Measuring the ORP Note IDS ORP s...

Страница 62: ...d time interval The minimum duration until a measured value is assessed as stable is the monitored time interval The actual duration is mostly longer 3 Select the mV display with M 1 Freeze the measur...

Страница 63: ...measuring settings of the ORP measurement To open the settings display the required parameter in the measured value display and press the MENU ENTER key After completing the settings switch to the mea...

Страница 64: ...ing cases Measurement in grounded test samples Measurement in one test sample with several sensors connected to one Multi 3430 Temperature measurement IDS D O sensors measure the temperature with a te...

Страница 65: ...s displayed in the measuring win dow of the D O sensor In the measuring window of the IDS conduc tivity sensor providing the measured salinity value the Sal status indicator is displayed Manual determ...

Страница 66: ...measurement data are not output to the interface 2 Release the frozen measured value again with AR The HOLD function is switched off The HOLD status display disappears 1 Freeze the measured value wit...

Страница 67: ...correction Salinity salinity equivalent Settings The settings are available in the menu for measurement and calibration settings To open the settings display the required parameter in the measured va...

Страница 68: ...days The FDO Check status display indica tor in the measuring window reminds you to check the sensor regularly Sal automatic on off Automatic salt content correction for concentration measurements Th...

Страница 69: ...al filter is character ized by the response time t90 This is the time after which 90 of a signal change is displayed This menu item is only available if sensor and meter support this func tion Firmwar...

Страница 70: ...ity assurance measures FDO Check procedure Check in water vapor saturated air Use the check and storage vessel to carry out the FDO Check proce dure Stability control AutoRead The Stability control fu...

Страница 71: ...air saturated water the nominal value for the relative D O saturation abbreviated saturation is 100 Therefore the validity scope is 98 102 The check resulted in a measured value of 99 3 The measureme...

Страница 72: ...ures Calibration in water vapor saturated air To calibrate the FDO 925 sensor use the check and storage vessel Stability control AutoRead In calibration the Stability control function AutoRead is auto...

Страница 73: ...storage vessel long enough so it can adapt to the ambient temperature Display Calibration record Relative slope S 0 94 1 06 S 0 92 0 94 or S 1 06 1 08 S 0 90 0 92 or S 1 08 1 10 Error Error S 0 90 or...

Страница 74: ...ty stability control The AR status indicator is displayed The measured parame ter flashes 5 Wait for the AutoRead measurement to be completed HOLD AR display or accept the calibration value with MENU...

Страница 75: ...e MENU ENTER_ key in the measured value display Menu item Setting function Description Calibration Calibration data stor age Display Displays the calibration records Further options Scroll through the...

Страница 76: ...nsors connected to one Multi 3430 Temperature measurement IDS sensors measure the temperature with a temperature sensor inte grated in the IDS sensor Preparatory activities Perform the following prepa...

Страница 77: ...you switch the HOLD function off Note If the HOLD function is active you can e g start a manual measure ment with stability control Stability control AutoRead The stability control function AutoRead...

Страница 78: ...the Stability control function manually The AR status indicator appears while the measured value is assessed as not stable A progress bar is displayed and the display of the measured parameter flashes...

Страница 79: ...mperature compensation off Note The reference temperature and temperature compensation are set in the menu for the parameter conductivity see section 4 10 4 Application tips Select the following tempe...

Страница 80: ...ith M The possible settings are individually displayed for each sensor Below the setting menu is displayed for two IDS sensors TetraCon 925 LR 925 01 Default settings are printed in bold Setting menu...

Страница 81: ...set here Temp comp TC Method nLF Lin off Procedure for temperature com pensation see section 4 10 3 This setting is only available for the measured parameters and Temp comp TC Linear coeff 0 000 2 00...

Страница 82: ...This setting is only available for the measured parame ters and Temp comp TC Linear coeff 0 000 2 000 10 000 K Coefficient of the linear tem perature compensation This setting is only available when t...

Страница 83: ...KCl In the delivery condition the calibrated cell constant of the IDS sensor is set to 0 475 cm 1 conductivity measuring cell TetraCon 925 Stability control AutoRead In calibration the Stability cont...

Страница 84: ...uctivity parame ter with M 3 Start the calibration with CAL The cell constant that was calibrated last is displayed 4 Immerse the IDS conductivity sensor in the control standard solution 0 01 mol l KC...

Страница 85: ...ss the MENU ENTER key in the measured value display Menu item Setting function Description Calibration Calibration data storage Display Displays the calibration records Further options Scroll through...

Страница 86: ...ies Avoid gas bubbles e g air bubbles in the test sample Use suitable vessels for measurement and calibration see operating manual of the VisoTurb 900 P sensor Heed the minimum depth of immersion for...

Страница 87: ...If the HOLD function is active you can e g start a manual measure ment with stability control Stability control AutoRead The stability control function AutoRead continually checks the stability of the...

Страница 88: ...longer 4 11 3 Settings for turbidity sensors 1 Freeze the measured value with AR The HOLD status indicator is displayed 2 Using MENU ENTER activate the Stability control function manually The AR stat...

Страница 89: ...gular intervals Menu item Possible setting Explanation Calibration Calibration record Displays the calibration record of the last calibration Calibration Calibration data storage Display Displays the...

Страница 90: ...ndard solution Range FNU NTU 1 0 0 1 0 2 5 0 200 0 3 200 0 4000 0 As the standard with turbidity value 0 0 FNU you can use clean tap water or filtered deionized water in a suitable cal ibration vessel...

Страница 91: ...at an angle 8 Position the turbidity sensor in the measuring vessel see sec tion 4 11 1 9 Use and to set the concentration of the standard solution for each digit and confirm with MENU ENTER The stand...

Страница 92: ...Calibration data storage Display To open the Cal ibration menu press the MENU ENTER key in the measured value display 12 Immerse the turbidity sensor in the test sample at an angle 13 Position the tur...

Страница 93: ...er options Scroll through the cali bration records with Output the displayed cal ibration record to the interface with PRT Output all calibration records to the interface with PRT_ Quit the display wi...

Страница 94: ...of all main measured values Example Depth of immersion as main and secondary measured value MPP 9x0 IDS with a pH IDS sensor of the XXX P series When the probe is equipped to capacity MPP 930 with 3 I...

Страница 95: ...uipment of the MPP 9x0 IDS the following value is displayed as the depth of immersion the depth of immersion of the connected IDS sensors averaged value for all IDS sensors of the XXX P series the dep...

Страница 96: ...04 2015 1 Connect the IDS sensors of the XXX P series or Close any open plug in positions on the MPP 9x0 IDS with blind plugs 2 Connect the MPP 9x0 IDS multi parameter probe to the meter The depth of...

Страница 97: ...DPT Then you can enter the salinity salt content of the test sample see section 4 12 3 If the salinity correction is switched on the Sal display appears in the measurement window of the parameter dep...

Страница 98: ...e Stability control function monitors whether the measured values are stable during the monitored time interval 2 Release the frozen measured value again with AR The HOLD function is switched off The...

Страница 99: ...use M to switch to the measured value display The possible settings are displayed individually for each sensor Default settings displayed in bold Setting menu Measured parameter Time interval Stabilit...

Страница 100: ...be is still open Connect a sensor or Close the plug in position with a blind plug A blind plug is not recognized Check the blind plug Unplug all sensors from the meter Connect the blind plug to the me...

Страница 101: ...an IDS sensor of the XXX P series directly to the meter with a cable 4 Carry out the function Calibrate the IDS sensor see section for measured param eter Reset the IDS sensor see section for measured...

Страница 102: ...ID number Measured value of the connected sensor Measured temperature value of the connected sensor AutoRead info AR appears with the measured value if the AutoRead criterion was met while storing sta...

Страница 103: ...13 2 Automatic storage at intervals The storage interval Interval determines the time interval between automatic storage processes Each storage process transmits the cur rent dataset to the interface...

Страница 104: ...Max available storing duration Graphical display of the storage usage Menu item Possible setting Description ID number 1 10000 ID number for the dataset series Interval 1 s 5 s 10 s 30 s 1 min 5 min...

Страница 105: ...h off function are deactivated Terminating the automatic storage function prematurely Proceed as follows to switch off the automatic storage function before the adjusted storage duration has expired 1...

Страница 106: ...as an exam ple The same settings and functions are available for the automatic storage Settings Menu item Setting function Description Data storage Manual data storage Display Displays all measurement...

Страница 107: ...rage How to erase the measurement data memory is described in section 4 13 3 EDITING THE MEASUREMENT DATA STORAGE Manual data storage 3 of 64 15 03 2014 11 24 16 ID number 1 SenTix 940 B20234008565 pH...

Страница 108: ...a the USB B interface Installation of the USB driver on the PC System requirements of the PC for installation of the USB driver PC with at least one free USB connection and CD ROM drive Windows 2000 W...

Страница 109: ...transmit data to a USB memory device is described in an extra section see section 4 14 5 The following table shows which data are transmitted to the interface in which way 1 Connect a USB memory devic...

Страница 110: ...5 The following table shows which data are transmitted to the interface in which way Current measured values of all connected sensors Manual With PRT Simultaneously with every manual storage process s...

Страница 111: ...initialize all sensor settings and sensor independent settings separately from each other 4 16 1 Resetting the measurement settings Note The calibration data are reset to the default settings togethe...

Страница 112: ...t settings To open the settings display the required parameter in the measured value display and press the MENU ENTER key Dissolved oxygen The following settings for D O measurements are reset to the...

Страница 113: ...n The sensor settings are reset under the Reset menu item in the menu for calibration and measurement settings To open the settings display the required parameter in the measured value display and pre...

Страница 114: ...are reset in the menu Storage config System Reset To open the Storage config menu press the MENU ENTER_ key in the measured value display Setting Default settings Language English Acoustic signal on V...

Страница 115: ...the rechargeable batteries are posi tioned correctly The signs on the batteries must correspond to the signs in the battery compartment Note Dispose of used batteries according to the local regulatio...

Страница 116: ...h Disinfect the housing with isopropanol as required CAUTION The housing is made of synthetic material ABS Thus avoid con tact with acetone or similar detergents that contain solvents Re move any spla...

Страница 117: ...y Charge the batteries see section 3 3 2 CONNECTING THE POWER PACK CHARGING THE BATTERIES Replace the batteries see section 5 1 MAINTENANCE Cause Remedy Operating condition undefined or EMC load unall...

Страница 118: ...ting erases all data on the USB memory device Back up all data before reformatting Cause Remedy The USB B interface is con nected to a PC Disconnect the PC from the USB B interface Connected USB memor...

Страница 119: ...What to do if Multi 3430 119 ba75865e19 04 2015 Error message Memory error 1 Cause Remedy Instrument storage was not found Please contact the service...

Страница 120: ...lyte dried out Exchange IDS pH sensor Cause Remedy IDS pH sensor The values determined for zero point and slope of the IDS pH sensor are outside the allowed limits Recalibrate Junction contaminated Cl...

Страница 121: ...le Adjust temperature if neces sary IDS pH sensor test sample Conductivity too low Use suitable IDS pH sensor Temperature too high Use suitable IDS pH sensor Organic liquids Use suitable IDS pH sensor...

Страница 122: ...ng medium Defective sensor Replace sensor Note More information as well as notes on cleaning and replacement of sensors are given in the documentation of your sensor Cause Remedy Measured value outsid...

Страница 123: ...ection light Check the calibration Minimum depth of immersion not observed Heed the minimum depth of immersion of the sensor 2 cm Cause Remedy Measured value outside the measuring range Select a suita...

Страница 124: ...Multi 3430 What to do if 124 ba75865e19 04 2015...

Страница 125: ...her days 85 Power supply Rechargeable batteries 4 x 1 2 V NiMH rechargeable batteries type AA Operational life Approx 150 h Power pack charging device Kuantech Co Ltd KSAC 0900110W1UV 1 Input 100 240...

Страница 126: ...This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against...

Страница 127: ...the oxygen in a gas mixture or liquid Electromotive force of an electrode The electromotive force U of the combination electrode is the measur able electromotive force of an electrode in a solution It...

Страница 128: ...of dissolved salts to the mass of the solution in g kg In practice this dimension cannot be measured directly Therefore the practical salinity according to IOT is used for oceanographic monitoring It...

Страница 129: ...88 90 D Dataset 82 Date and time 31 Default settings Measured parameter 91 System settings 94 Display 11 E Energy saving feature 23 F Firmware update 107 I Initial commissioning 21 23 Initialize 91 In...

Страница 130: ...lity control automatic 35 Conductivity 73 O2 65 ORP 61 pH 38 Storage interval 83 Storing in memory 63 Automatic 83 Manual 83 T Temperature compensation 75 Temperature measurement Conductivity 71 O2 63...

Страница 131: ...and on you can check whether the meter has taken over the new software version see page 117 1 Install the downloaded firmware update on a PC An update folder is created in the Windows start menu If a...

Страница 132: ...irmware update on a PC An update folder is created in the Windows start menu If an update folder already exists for the sensor or sensor type the new data are displayed there 2 In the windows start me...

Страница 133: ......

Страница 134: ...water needs Developing new technologies that will improve the way water is used conserved and re used in the future is central to our work We move treat analyze and return water to the environment and...

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