wtw geotech Multi 350i Operating Manual
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wtw geotech Multi 350i Operating Manual

Ph / ise / do / conductivity measuring instrument
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Operating manual
2650 E. 40th Ave. • Denver, CO 80205
Phone 303-320-4764 • Fax 303-322-7242
1-800-833-7958
www.geotechenv.com
Multi 350i
pH / ISE / DO / conductivity measuring instrument
ba75420e04
03/2005

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  • Page 1 For Sales & Service Contact Operating manual 2650 E. 40th Ave. • Denver, CO 80205 Phone 303-320-4764 • Fax 303-322-7242 1-800-833-7958 www.geotechenv.com Multi 350i pH / ISE / DO / conductivity measuring instrument ba75420e04 03/2005...
  • Page 2 Multi 350i firmware is available on the Internet. It can easily be downloaded on your meter using the enclosed AK 340/B cable and a PC. For more detailed information, refer to the appendix of this operating manual or to the Internet under http://www.WTW.com. © Copyright...

  • Page 3: Table Of Contents

    Multi 350i Contents Overview ........3 General features .
  • Page 4 Contents Multi 350i Conductivity ........58 4.7.1 General information .

  • Page 5: Overview

    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.

  • Page 6: Sets Of Equipment

    Overview Multi 350i SETs of equipment The measuring instrument is also available as part of individual SETs of equipment. You will find additional information on this and other accessories in the WTW catalog or via the Internet.
  • Page 7 Multi 350i Overview Set (sample configuration): Multi 350i measuring instrument, carrying strap with 2 carrying clips, armoring Cond/Oxi beaker with beaker clip pH beaker Stand Plastic beaker, 50 ml Storing solution for pH electrodes 50 ml pH buffer solution, STP 4 50 ml pH buffer solution, STP 7 Calibration and control standard for conductivity measuring cells, 50 ml...

  • Page 8: Keypad

    Overview Multi 350i Keypad MENU ENTER Key functions Select the measured variable <M>: – pH value / ORP / ion concentration – DO concentration / DO saturation / DO partial pressure – Conductivity / specific resistance / salinity / Output display contents to RS232 interface (e.g. print) <PRT>...

  • Page 9: Display

    Multi 350i Overview Display The graphical display can indicate up to three measuring windows at the same time. The illumination enables to read the display even in the darkness. You can modify the display to meet your requirements in multiple ways. Measured variable Measured value (with unit) 6.949...
  • Page 10 Overview Multi 350i...

  • Page 11: Safety

    Multi 350i Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the measur- ing instrument. Consequently, all responsible personnel must read this operating manual before working with the measuring system. The op- erating manual must always be available within the vicinity of the mea- suring system.

  • Page 12: General Safety Instructions

    Safety Multi 350i General safety instructions This instrument is built and inspected according to the relevant guide- lines and norms for electronic measuring instruments (see chapter ECHNICAL DATA It left the factory in a safe and secure technical condition. Function and operating The smooth functioning and operational safety of the measuring instru- safety ment can only be guaranteed if the generally applicable safety mea-...

  • Page 13: Commissioning

    Multi 350i Commissioning Commissioning Scope of delivery ! Multi 350i handheld measuring instrument with 4 rechargeable bat- teries, 1.2 V type AA in the instrument ! Plug-in power supply with Euro plug, exchange plugs for USA, UK, and Australia are enclosed ! Operating manual and short operating manual ! MultiLab pilot CD-ROM Power supply...

  • Page 14: Initial Commissioning

    Commissioning Multi 350i If necessary, replace the Euro plug (1) on the plug-in power supply unit (2) by the country-specific plug suitable for your country. Connect the plug (3) to the socket (4) of the measuring instru- ment. Connect the plug-in power supply unit to an easily accessible mains socket.

  • Page 15: Operation

    Multi 350i Operation Operation Switching on the measuring instrument Switching on Press the <ON/OFF> key. The measured value display appears. 6.949 25.0 °C Switching off Press the <ON/OFF> key. Automatic switchoff The instrument has an automatic switchoff function in order to save the batteries (see section 4.3.3).

  • Page 16: General Operating Principles

    Operation Multi 350i General operating principles This section contains basic information of the operation of the Multi 350i. Operating elements, An overview of the operating elements and the display is given in display section 1.3 and section 1.4. Operating modes, An overview of the operating modes and navigation of the Multi 350i is navigation given in section 4.2.1 and section 4.2.2.

  • Page 17: Navigation

    Multi 350i Operation 4.2.2 Navigation Measured value display In the measured value display, you can ! select a measuring window with <L> <M> and open the relevant measuring menu by shortly pressing <MENU/ENTER>. ! open the system menu with the sensor-independent settings by pressing <MENU/ENTER>...
  • Page 18 Operation Multi 350i ! Functions Functions are designated by the name of the function. They are im- mediately carried out by confirming with <MENU/ENTER>. Example: Display the Calibration record function. Calibration type Calibration interval Unit for slope mV/pH Calibration record i 2.00 4.01 7.00 10.01 Information or operating instructions are designated by the i symbol.

  • Page 19: Example 1 On Navigation: Setting The Language

    Multi 350i Operation 4.2.3 Example 1 on navigation: Setting the language Press the <ON/OFF> key. The measured value display appears. The instrument is in the measuring ode. 7.00 25.0 °C Open the system menu by pressing <MENU/ENTER> for a long time (approx. 1 s). The instrument is in the setting mode.
  • Page 20 Operation Multi 350i Open the General submenu with <MENU/ENTER>. System Language Deutsch Beep Illumination Contrast 48 % Temperature unit °C Switchoff time 30 min Open the setting mode for the Language with <MENU/ENTER>. System Language Deutsch Beep Illumination Contrast 48 % Temperature unit °C Switchoff time...

  • Page 21: Example 2 On Navigation: Setting The Date And Time

    Multi 350i Operation 4.2.4 Example 2 on navigation: Setting the date and time The measuring instrument has a clock with a date function. The date and time are indicated in the status line of the measured value display. The indication can be switched off. When storing measured values and calibrating, the current date and time are automatically stored as well.
  • Page 22 Operation Multi 350i Change and confirm the setting with <L> <M> and <MENU/ ENTER>. The hours are highlighted. Change and confirm the setting with <L> <M> and <MENU/ ENTER>. The time is set. If necessary, set the Date and Date format. The setting is made similarly to that of the time.

  • Page 23: System Settings (System Menu)

    Multi 350i Operation System settings (system menu) The system menu comprises the following settings: ! Data storage (see section 4.3.1) ! Display (see section 4.3.2) ! System (see section 4.3.3). 4.3.1 Data storage This menu contains all functions to display, edit and erase stored mea- sured values and calibration records.
  • Page 24 Operation Multi 350i Settings To open the system menu in the measured value display, press the <MENU/ENTER> key for approx. 1 s. After completing the settings, switch to the measured value display with <M>. Menu item Setting Description Display / Time Display of the time in the system status line Display / Date...

  • Page 25: System

    Multi 350i Operation 4.3.3 System Overview The following sensor-independent instrument features can be adjusted in the system menu/System and its submenus: ! Menu language ! Beep on keystroke ! Display illumination ! Display contrast ! Unit of the temperature display ! Interval of the automatic switchoff ! Data interface ! Clock and date function...
  • Page 26 Operation Multi 350i Menu item Setting Description System / Interface / 1200, 2400, Baud rate of the data inter- Baud rate 4800, 9600, face 19200 System / Interface / ASCII Output format for data trans- Output format mission For details, see section 4.9 System / Interface / Option for output in csv for- Header...

  • Page 27: Ph Value / Orp Voltage

    Multi 350i Operation pH value / ORP voltage 4.4.1 General information You can measure the following variables: ! pH value [ ] ! ORP [mV] Caution When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.
  • Page 28 Operation Multi 350i The display of the temperature indicates the active temperature mea- suring mode: Temperature Resolution Mode sensor of the temp. display Cond or 0.1 °C Automatic with pH tem- perature sensor 0.1 °C 1 °C Manual 0.1 °C, The temperature value of measured the second sensor (Cond...

  • Page 29: Measuring The Ph Value

    Multi 350i Operation 4.4.2 Measuring the pH value Perform the preparatory activities according to section 4.6.1. Immerse the pH electrode in the test sample. 6.949 24.8 °C Select the pH or mV display with <M>. AutoRead The AutoRead function (drift control) continually checks the stability of (Drift control) the measurement signal.

  • Page 30: Measuring The Orp Voltage

    Operation Multi 350i 4.4.3 Measuring the ORP voltage Note ORP electrodes are not calibrated. However, you can check ORP elec- trodes using a test solution. Perform the preparatory activities according to section 4.6.1. Submerse the ORP electrode in the sample. 157.0 24.8 °C...

  • Page 31: Settings For Ph And Orp Measurements

    Multi 350i Operation 4.4.4 Settings for pH and ORP measurements Overview The following settings are possible for pH and ORP measurements: ! Resolution ! Calibration interval ! Buffers for calibration ! Unit for slope ! Calibration record (display) Settings The settings are made in the measuring menu of the pH/ORP measure- ment.

  • Page 32: Ph Calibration

    Operation Multi 350i 4.4.5 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.
  • Page 33 Multi 350i Operation Calibration points Calibration can be performed using one, two or three buffer solutions in any order (single-point, two-point or three-point calibration). The mea- suring instrument determines the following values and calculates the calibration line as follows: Determined Displayed calibration data values ! Asymmetry = ASY...
  • Page 34 Operation Multi 350i Display calibration data You can have the data of the last calibration displayed (see and output to interface section 4.8.5). Subsequently, you can transmit the displayed calibra- tion data to the interface, e. g. to a printer or PC, with the <PRT> key. Note The calibration record is automatically transmitted to the interface after calibrating.
  • Page 35 Multi 350i Operation Calibration evaluation After calibrating, the measuring instrument automatically evaluates the calibration. The asymmetry 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. Display Calibration Asymmetry...

  • Page 36: Carrying Out The Tec And Nist/Din Calibration

    (see section 4.4.5). Make sure that the Calibration type is cor- rectly set in the sensor menu (see section 4.4.4). For this procedure, use any one, two or three WTW technical buffer so- lutions in ascending or descending order.
  • Page 37 Multi 350i Operation pH <CAL> Displayed: i Buffer value = 7.000 – Recognized nominal buffer i U = 3.0 mV value (referring to 25 °C) i Temperature = 24.8 °C – current electrode voltage – current temperature value Terminate AutoRead Wait for the end of the AutoRead measurement or accept the calibration value with <MENU/ENTER>.
  • Page 38 Operation Multi 350i Continuing for two-point Thoroughly rinse the electrode with distilled water. calibration (Calibration type TEC) Immerse the electrode in buffer solution 2. If the Set temperature menu item appears, measure and enter the temperature of the buffer manually (measurement without temperature sensor).
  • Page 39 Multi 350i Operation Continuing for three- Thoroughly rinse the electrode with distilled water. point calibration (Calibration type TEC) Immerse the electrode in buffer solution 3. If necessary, measure the temperature of buffer 3 manually, then enter and confirm it with <L> <M> and <MENU/ENTER> in the Set temperature setting.

  • Page 40: Carrying Out A Concal Calibration

    Operation Multi 350i 4.4.7 Carrying out a ConCal calibration Single-point calibration Use any buffer solution for this rapid method. The calibration will be the more exact the nearer the pH value of the buffer solution is to that of the test sample. Two-point calibration Use two buffer solutions for this procedure: ! first buffer solution: pH 7.0 ±...
  • Page 41 Multi 350i Operation pH <CAL> i Buffer value = 6.80 i U = 12.0 mV i Temperature = 24.8 °C Terminate AutoRead Wait for the end of the AutoRead measurement or Terminate AutoRead and accept the calibration value with <MENU/ENTER>. The calibration display for the next buffer appears.
  • Page 42 Operation Multi 350i Continuing for two-point Thoroughly rinse the electrode with distilled water. calibration (Calibration type Immerse the electrode in buffer solution 2. ConCal) Set the nominal buffer value with <MENU/ENTER> and <L> <M>. Then confirm the value with <MENU/ENTER>. If the Set temperature menu item appears, measure and enter the temperature of the buffer manually (measurement without temperature sensor).

  • Page 43: Ion Concentration

    Multi 350i Operation Ion concentration 4.5.1 General information Note Incorrect calibration of ion sensitive electrodes will result in incorrect measured values. Calibrate regularly before measuring. Caution When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

  • Page 44: Measuring The Ion Concentration

    Operation Multi 350i Preparatory activities Perform the following preparatory activities when you want to measure: Connect the ISE combination electrode to the measuring in- strument. The pH/ISE measuring window is displayed. If necessary, select the ISE display (unit, mg/l) with <M>. Measure the temperature of the test sample using a thermom- eter.

  • Page 45: Settings For Ise Measurements

    Multi 350i Operation adjust the temperature of the standard and measuring solutions ac- cordingly. If the temperature difference is greater the [TempErr] warn- ing appears in the measured value display. 4.5.3 Settings for ISE measurements Overview The following settings are possible for ISE measurements: ! Calibration record (display) Settings The settings are made in the measuring menu of the ISE measure-...
  • Page 46 Operation Multi 350i Standard solutions Use two or three different standard solutions. For three-point calibra- tion, the standard solutions have to be selected in either increasing or decreasing order. Standard Values [mg/l] solution Std 1 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20; 50; 100; 200;...
  • Page 47 Multi 350i Operation Note The calibration record is automatically transmitted to the interface after calibrating. Sample record: 03.11.03 07:14 CALIBRATION ISE 03.11.03 07:12:01 Multi 350i ser. no. 12345678 Standard 1 0.010 mg/l Standard 2 0.020 mg/l Voltage 1 0.0 mV 24.0 °C Voltage 2 9.0 mV...
  • Page 48 Operation Multi 350i Preparatory activities Perform the following preparatory activities when you want to calibrate: Connect the ISE combination electrode to the measuring in- strument. The pH/mV/ISE measuring window is displayed. Keep the standard solutions ready. Measure the temperature of the standard solutions using a thermometer.
  • Page 49 Multi 350i Operation ISE <CAL> i Standard = 0.010 mg/l i U = 0.5 mV Terminate AutoRead Wait for the end of the AutoRead measurement or accept the calibration value with <MENU/ENTER>. The calibration display for the next standard solution appears. ISE <CAL>...
  • Page 50 Operation Multi 350i ISE <CAL> i Standard = 0.020 mg/l i U = 8.4 mV Terminate AutoRead Wait for the end of the AutoRead measurement or accept the calibration value with <MENU/ENTER>. The calibration display for the next standard solution appears. ISE <CAL>...

  • Page 51: Dissolved Oxygen

    Multi 350i Operation Dissolved oxygen 4.6.1 General information You can measure the following variables: ! DO concentration ! DO saturation index ("DO saturation") ! DO partial pressure DO measurements with the Multi 350i can be carried out using a Con- Ox, CellOx 325, DurOx 325 or StirrOx G DO sensor.

  • Page 52: Measuring

    Operation Multi 350i Preparatory activities Perform the following preparatory activities when you want to measure: Connect the DO sensor to the measuring instrument. The DO measuring window is displayed. Calibrate or check the measuring instrument with the sensor. 4.6.2 Measuring Perform the preparatory activities according to section 4.6.1.

  • Page 53: Settings For Do Sensors

    Multi 350i Operation Note The ConOx double sensor can perform the salinity correction automat- ically. The conductivity module of the sensor measures the salt content of the test sample simultaneously with the DO. The measuring instru- ment takes the measured value into account. AutoRead The AutoRead function (drift control) continually checks the stability of (drift control)
  • Page 54 Operation Multi 350i Settings The settings are made in the measuring menu of the DO measurement. To open the settings, activate the relevant measuring window in the measured value display and press the <MENU/ENTER> key shortly. After completing the settings, switch to the measured value display with <M>.

  • Page 55: Do Calibration

    Multi 350i Operation 4.6.4 DO calibration Why calibrate? DO sensors age. This changes the slope of the DO sensor. Calibration determines the current slope of the sensor and stores this value in the instrument. ! After connecting another DO sensor When to calibrate? ! When the sensor symbol flashes (after the calibration interval has expired).
  • Page 56 Operation Multi 350i Sample record: 03.11.03 07:14 CALIBRATION ConOx 03.11.03 07:12:58 Multi 350i ser. no. 12345678 Cal. interval 14 d Relative slope 0.97 Sensor Calibration evaluation After the calibration, the measuring instrument evaluates the current status of the sensor against the relative slope. The evaluation appears on the display and in the calibration record.
  • Page 57 Multi 350i Operation Calibration in For this calibration procedure, the Comparison meas. setting must be water vapor set to Off in the measuring menu. saturated air Proceed as follows to calibrate the instrument: (air calibration vessel) Note The sponge in the air calibration vessel must be moist (not wet). Leave the sensor in the air calibration vessel for a time long enough to adjust.
  • Page 58 Operation Multi 350i ConOx <CAL> i Relative slope = 0.98 i Sensor+++ Accept You have the following options: ! Accept the new calibration values with <MENU/ENTER>. Subsequently, the calibration record is displayed and output to the interface at the same time. ! To switch to the measured value display without accepting the new calibration values, press <M>...
  • Page 59 Multi 350i Operation Press <MENU/ENTER>. The AutoRead measurement to determine the DO concentrati- on starts. ConOx <CAL> i Concentration = 8.5 mg/l i Temperature = 24.8 °C Terminate AutoRead Wait for the end of the AutoRead measurement or accept the measured value with <MENU/ENTER>.

  • Page 60: Conductivity

    Operation Multi 350i Conductivity 4.7.1 General information You can measure the following variables: ! Conductivity ! Specific resistance ! Salinity ! Total dissolved solids (TDS) The measuring instrument is supplied with the following functions: ! AutoRange (automatic switchover of the measurement range). If a measuring range is exceeded, AutoRange causes the measuring in- strument to automatically change to the next higher measuring range and back again.

  • Page 61: Measuring

    Multi 350i Operation 4.7.2 Measuring You can carry out conductivity measurements as follows: Perform the preparatory activities according to section 4.7.1. Immerse the conductivity measuring cell in the test sample. µS/cm 24.8 °C Selecting the You can switch between the following displays with <M>: displayed ! Conductivity [µS/cm] / [mS/cm] measured variable...

  • Page 62: Temperature Compensation

    Operation Multi 350i 4.7.3 Temperature compensation The calculation of the temperature compensation is based on the pre- set reference temperature, 20 °C or 25 °C. It appears on the display as Tr20 or Tr25. You can select one of the following temperature compensation meth- ods: ! Nonlinear temperature compensation (nLF) according to EN 27 888...

  • Page 63: Settings For Conductivity Measuring Cells

    Multi 350i Operation 4.7.4 Settings for conductivity measuring cells Overview The following settings are possible for conductivity measuring cells: ! Measured variable ! Reference temperature ! Temperature compensation ! TDS factor ! Calibration interval ! Measuring cell/cell constant Settings The settings are made in the measuring menu of the conductivity mea- surement.
  • Page 64 Operation Multi 350i Menu item Possible Description setting Temp. comp. (TC) / 0.000 ... Coefficient of the linear tem- Linear coeff. 3.000 %/K perature compensation. This setting is only available when the linear temperature compensation is set. Measuring cell Measuring cell used Measuring cells the cell con- stant of which is determined by calibration in the KCL con-...

  • Page 65: Determining The Cell Constant (Calibration In The Control Standard)

    Multi 350i Operation 4.7.5 Determining the cell constant (calibration in the control standard) Why determine the cell Aging slightly changes the cell constant, e. g. by coatings. As a result, constant? an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell.
  • Page 66 Operation Multi 350i Calibration evaluation After the calibration, the measuring instrument automatically evaluates the current status of the calibration. The evaluation appears on the dis- play and in the calibration record. Display Calibration Cell constant [cm record within the ranges 0.450 ...
  • Page 67 Multi 350i Operation Press <MENU/ENTER>. The AutoRead measurement to determine the cell constant starts. <CAL> i Cell constant = 0.481 1/cm i Temperature = 24.8 °C Terminate AutoRead Wait for the end of the AutoRead measurement or accept the calibration value with <MENU/ENTER>. The determined cell constant is displayed as a message ( <CAL>...

  • Page 68: Data Storage

    Operation Multi 350i Data storage You can transmit measured values (data records) to the data storage in two ways: ! Manual data storage (see section 4.8.1) ! Automatic data storage at intervals (see section 4.8.2) Each storage process transmits the current dataset to the interface at the same time.

  • Page 69: Manual Data Storage

    Multi 350i Operation 4.8.1 Manual data storage Proceed as follows to transmit to the data data storage and simulta- neously output to the interface a measurement dataset: Press the <STO> key shortly. The menu for manual data storage appears. <STO> 1 of 504 - 30.10.2003 11:24:16 - pH 7.000 24.8 °C AR...

  • Page 70: Automatic Data Storage At Intervals

    Operation Multi 350i 4.8.2 Automatic data storage at intervals The storage interval (Interval) determines the chronological interval be- tween automatic storage processes. Each storage process transmits the current dataset to the interface at the same time. Configuring the auto- Press the <STO> key for a long time. matic data storage func- The menu for automatic data storage appears.
  • Page 71 Multi 350i Operation Data storage adminis- The two lower display lines indicate the use of the data storage calcu- tration lated in advance for the selected settings: <STO_> Store with ID no. Adjusted storage duration for the Interval 30 s entire dataset series Duration 180 min...

  • Page 72: Editing The Measured Value Storage

    Operation Multi 350i Terminating the auto- Proceed as follows to switch off the automatic data storage function be- matic data storage func- fore the adjusted storage duration has expired: tion prematurely Press the <STO> key for a long time. The following window appears. Warning Stop automatic storage? Select and confirm Yes with <L>...
  • Page 73 Multi 350i Operation Settings Menu item Setting/ Description function Data storage / Displays in pages all mea- Manual data storage / suring datasets that corre- Display spond to the filter settings. Further options: ! Scroll through the datasets with <L> <M>. ! Output the displayed dataset to the interface with <PRT>.
  • Page 74 Operation Multi 350i Data filter Menu item Setting/ Description function Filter Filter criteria: No filter Data filter switched off Date & ID Selection according to pe- number riod and ID number ID number Selection according to ID number Date Selection according to pe- riod From TT.MM.JJ...

  • Page 75: Erasing The Measured Value Storage

    Multi 350i Operation Sample printout 3.11.03 15:48:08 Multi 350i ser. no. 12345678 ID number: 1 0.316 mg/l 22 °C , AR Oxi 6.32 mg/l 24.8 °C , AR Sal = 0.7 Cond 1413 uS/cm 24.8 °C C = 0.975 1/cm, Tref25, Lin, TC = 2.000 %/K ________________________________________ 03.11.03 09:56:20...

  • Page 76: Displaying And Outputting Calibration Records

    Operation Multi 350i 4.8.5 Displaying and outputting calibration records You can display the calibration data ! of one selected sensor, or ! of all sensors connected and then output them to the interface. Displaying the calibra- The calibration record of the last calibration can be found under the Cal- tion record of a selected ibration / Calibration record menu item in the respective measuring sensor...
  • Page 77 Multi 350i Operation Sample printout 03.11.03 07:14 CALIBRATION pH 03.11.03 07:10:45 Multi 350i ser. no. 12345678 Cal. interval AutoCal TEC Buffer 1 4.01 Buffer 2 7.00 Buffer 3 10.01 Voltage 1 184.0 mV 24.0 °C Voltage 2 0.0 mV 24.0 °C Voltage 3 -177.0 mV 24.0 °C...

  • Page 78: Transmitting Data (Rs 232 Interface)

    Operation Multi 350i Transmitting data (RS 232 interface) 4.9.1 Options for data transmission Via the RS 232 interface, you can transmit data to a PC or an external printer. The following table shows which data are transmitted to the in- terface in which way: Data Control...

  • Page 79: Connecting A Pc/External Printer

    Multi 350i Operation interface (displayed measured values, measuring datasets, calibration records). 4.9.2 Connecting a PC/external printer Use the AK340/B (PC) or AK325/S (ext. printer) cable to connect the interface to the devices. Caution The RS232 interface is not galvanically isolated. When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.

  • Page 80: Reset

    Operation Multi 350i 4.10 Reset You can reset (initialize) all sensor settings and sensor-independent settings separately from each other. 4.10.1 Resetting the sensor settings Note The calibration data are reset to the default settings together with the measuring parameters. Recalibrate after performing a reset. The following settings for pH measurements are reset to the default settings with the Reset function: Setting...

  • Page 81: Resetting The System Settings

    Multi 350i Operation Cond The following settings for conductivity measurements are reset to the default settings with the Reset function: Setting Default settings Cal. interval 150 d Measured variable Cell constant (c) 0.475 cm (calibrated) 0.475 cm (set up) Temperature compensation Reference temperature 25 °C Temperature coefficient (TC) of...
  • Page 82 Operation Multi 350i...

  • Page 83: Maintenance, Cleaning, Disposal

    Multi 350i Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The measuring instrument is maintenance-free. Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the housing with isopropanol as re- quired. Caution The housing components are made out of synthetic materials (polyurethane, ABS and PMMA).
  • Page 84 Maintenance, cleaning, disposal Multi 350i Open the housing: – Undo the four screws on the underside of the instrument – Open the lower cover (1). Take the four batteries (2) out of the battery compartment. Measuring instrument Dispose of the measuring instrument without the rechargeable batter- ies as electronic waste at an appropriate collection point.

  • Page 85: What To Do If

    Multi 350i What to do if... What to do if... pH and ORP measurement Error message, Cause Remedy OFL or UFL Electrode: (measuring range exceeded or undercut) – Air bubble in front of the – Remove air bubble diaphragm – Air in the diaphragm –...
  • Page 86 What to do if... Multi 350i No stable measured Cause Remedy value pH electrode: – Diaphragm contaminated – Clean diaphragm – Membrane contaminated – Clean membrane Test sample – pH value not stable – Measure with air excluded if necessary –...

  • Page 87: Ise Measurement

    Multi 350i What to do if... ISE measurement Error message OFL Cause Remedy – Measuring range exceeded – Dilute test sample Obviously incorrect Cause Remedy measured values – Electrode not connected – Connect electrode – Cable broken – Replace electrode Error message, Error Cause Remedy...

  • Page 88: Do Measurement

    What to do if... Multi 350i DO measurement DO sensor was not Cause Remedy recognized – Sensor not connected – Connect sensor – Cable broken – Replace sensor Error message OFL Cause Remedy – Measuring range exceeded – not possible Error message, Error Cause Remedy...

  • Page 89: Conductivity Measurement

    Multi 350i What to do if... Measured value too Cause Remedy high – High amount of dissolved – Correct solubility function substances using the salinity equivalent – Air bubbles bump on the – Avoid direct flow to the membrane with high velocity membrane –...

  • Page 90: General Errors

    What to do if... Multi 350i General errors Display, LoBat Cause Remedy – Batteries almost empty – Charge the batteries (see section 3.2) Instrument does not Cause Remedy react to keystroke – Operating condition undefined – Processor reset: or EMC load unallowed Press the <ON/OFF>...

  • Page 91: Technical Data

    Multi 350i Technical data Technical data General data Dimensions approx. 172 x 80 x 37 mm Weight approx. 0.3 kg (without plug-in power supply) Mechanical structure Type of protection IP 66 Electrical safety Protective class Test certificates cETLus, CE Ambient conditions Storage - 25 °C ...
  • Page 92 Technical data Multi 350i Guidelines EC guideline 89/336/EEC and norms used EN 61326-1:1998 EN 61000-3-2 A14:2000 EN 61000-3-3:1995 FCC Class A Instrument safety E.C. guideline 73/23/EEC EN 61010-1 A2:1995 Climatic class VDI/VDE 3540 IP protection EN 60529:1991 FCC Class A Equipment Statement Note: 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.

  • Page 93: Measuring Ranges, Resolution, Accuracy

    Multi 350i Technical data Measuring ranges, resolution, accuracy 7.2.1 pH/ORP Measuring ranges, Variable Measuring range Resolution resolution - 2.000 ... + 20.000 0.001 - 2.00 ... + 20.00 0.01 U [mV] - 999.9 ... + 999.9 - 2000 ... + 2000 T [°C] - 5.0 ...

  • Page 94: Dissolved Oxygen

    Technical data Multi 350i 7.2.3 Dissolved oxygen Measuring ranges, Note: The values quoted in brackets apply especially for the resolution DurOx 325 sensor. Variable Measuring range Resolution DO concentration 0 ... 20.00 (0 ... 20.0) 0.01 (0.1) [mg/l] 0 ... 90.0 (0 ... 90) 0.1 (1) Saturation [%] 0 ...

  • Page 95: Conductivity

    Multi 350i Technical data 7.2.4 Conductivity Measuring ranges, Variable Measuring range Resolution resolution [µS/cm] 0.000 ... 2.000* 0.001 0.00 ... 20.00** 0.01 0.0 ... 200.0 0 ... 2000 [mS/cm] 0.00 ... 20.00 0.01 0.0 ... 200.0 0 ... 2000 Specific resistance 0.000 ...
  • Page 96 0 °C ... + 35 °C according to EN 27 888 ± 0.5 % + 35 °C ... + 50 °C Extended nLF function according to WTW mea- surements Linear (lin) ± 0.5 % + 10 °C ... + 75 °C SAL / range 0.0 ...

  • Page 97: Lists

    Multi 350i Lists Lists This chapter provides additional information and orientation aids. Abbreviations The list of abbreviations explains the indicators and abbreviations that appear on the display and in the manual. Specialist terms The glossary briefly explains the meaning of the specialist terms. How- ever, terms that should already be familiar to the target group are not described here.
  • Page 98 Calibration type Automatic pH calibration with buffer solutions pre- NIST/DIN pared according to NIST or DIN 19 266 Calibration type Automatic pH calibration with WTW technical buff- er solutions according to DIN 19267 Cell constant [cm ] (internat. k) °C...
  • Page 99 Multi 350i Lists Total Dissolved Solids Tr20 Reference temperature of 20 °C Tr25 Reference temperature of 25 °C Display range undercut (underflow) Voltage...
  • Page 100 AutoRange Name of the automatic selection of the measuring range. AutoRead WTW name for a function to check the stability of the measured value. Calibration Comparing the value from a measuring system (e. g. the displayed value) to the correct value or a value that is regarded as correct. Of- ten, this expression is also used when the measuring system is adjust- ed at the same time (see adjusting).
  • Page 101 (e. g. a gold or platinum surface). ® OxiCal WTW name for a procedure to calibrate DO measuring systems in wa- ter vapor saturated air. pH value The pH is a measure of the acidic or basic effect of an aqueous solu- tion.
  • Page 102 The slope of a linear calibration function. Slope (relative) Designation used by WTW in the DO measuring technique. It ex- presses the relationship of the slope value to the value of a theoretical reference sensor of the same type of construction.

  • Page 103: Index

    Multi 350i Index Index ............. 7 Display ......7, 11, 13 Display illumination ........53 Air calibration vessel Drift control ....30 Asymmetry of the pH electrode ........... 51 ...........9 Authorized use ........... 42 ......11, 13 Automatic switchoff ..........28 AutoRead ............ 27 ..........51, 53 ............42 ..........28...
  • Page 104 Index Multi 350i .......... 77 MultiLab pilot Three-point calibration ........... 48 ............ 37 ........76 Transmitting data ..... 10 Obligations of the purchaser ....76 Transmitting measured values ........10 Operating safety Two-point calibration ........... 47 ..........36, 38 ......33 pH calibration evaluation .......

  • Page 105: Appendix: Firmware Update

    Multi 350i Appendix: Firmware Update Appendix: Firmware Update General The program "Firmware Update 350i" enables you to update the firm- ware of the Multi 350i handheld instrument to the latest version using a PC. To do so, you need a free serial (COM) port on your PC and the AK 340/B interface cable (contained in the scope of delivery of the Multi 350i).
  • Page 106 Appendix: Firmware Update Multi 350i...
  • Page 108 Wissenschaftlich-Technische Werkstätten GmbH Dr.-Karl-Slevogt-Straße 1 D-82362 Weilheim Germany Tel: +49 (0) 881 183-0 +49 (0) 881 183-100 Fax: +49 (0) 881 183-420 E-Mail: Info@WTW.com Internet: http://www.WTW.com...

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