Operating manual Multi 3500i M PRT CA L O STO ES C pH / ISE / DO / conductivity measuring instrument ba75689e01 01/2007
Accuracy when going to press The use of advanced technology and the high quality standard of our instruments are the result of a continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.
Multi 3500i Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 1.3 1.4 1.5 2 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 3.2 3.3 4 3 4 6 7 7 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 2.
Contents Multi 3500i 4.7 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7.1 General information . . . . . . . . . . . . . . . . . . . . . . 4.7.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7.3 Temperature compensation . . . . . . . . . . . . . . . . 4.7.4 Settings for conductivity measuring cells . . . . . . 4.7.5 Determining the cell constant (calibration in the control standard) . . . . . . . . . . . . . . . . . . . . . . . . 4.
Multi 3500i Overview 1 Overview 1.1 General features The Multi 3500i compact precision handheld meter enables you to carry out pH measurements, ISE measurements, dissolved oxygen (DO) measurements and conductivity measurements quickly and reliably. The Multi 3500i handheld meter provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.
Overview Multi 3500i 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.
Multi 3500i Overview Set (sample configuration): 1 Multi 3500i measuring instrument, carrying strap with 2 carrying clips, armoring 2 Cond/Oxi beaker with beaker clip 3 pH beaker 4 Stand 5 Plastic beaker, 50 ml 6 Storing solution for pH electrodes 7 50 ml pH buffer solution, STP 4 8 50 ml pH buffer solution, STP 7 9 Calibration and control standard for conductivity measuring cells, 50 ml 10 50 ml ELY/G electrolyte solution for DO sensors 11 50 ml RL/G cleaning solution for DO sensors
Overview Multi 3500i 1.3 Keypad M PRT CAL STO ESC MENU ENTER Key functions Select the measured variable : – pH value / ORP / ion concentration M – DO concentration / DO saturation / DO partial pressure – Conductivity / specific resistance / salinity / TDS Output display contents to RS232 interface (e.g.
Multi 3500i Overview 1.4 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 pH 7.29 mg/l O2 Temperature display 24.0 °C 24.0 °C Sensor symbol [SAL] 731 µS/cm 24.0 °C [nLF][Tr25] 05.09.03 09:25 1.
Overview 8 Multi 3500i
Multi 3500i Safety 2 Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the measuring instrument. Consequently, all responsible personnel must read this operating manual before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system. Target group The measuring instrument was developed for work in the field and in the laboratory.
Safety Multi 3500i 2.2 General safety instructions This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see chapter 7 TECHNICAL DATA). It left the factory in a safe and secure technical condition.
Multi 3500i Commissioning 3 Commissioning 3.1 Scope of delivery z Multi 3500i handheld measuring instrument with 4 rechargeable batteries, 1.2 V type AA in the instrument z Plug-in power supply with Euro plug, exchange plugs for USA, UK, and Australia are enclosed z Operating manual and short operating manual z MultiLab pilot CD-ROM 3.
Commissioning Multi 3500i 4 3 2 1 1 If necessary, replace the Euro plug (1) on the plug-in power supply unit (2) by the country-specific plug suitable for your country. 2 Connect the plug (3) to the socket (4) of the measuring instrument. 3 Connect the plug-in power supply unit to an easily accessible mains socket. 3.3 Initial commissioning Perform the following activities: z For mains operation and charging the batteries: Connect the plug-in power supply unit (see section 3.2 POWER SUPPLY).
Multi 3500i Operation Switching on 4 Operation 4.1 Switching on the measuring instrument Press the key. The measured value display appears. pH 6.949 25.0 °C Switching off Automatic switchoff Press the key. The instrument has an automatic switchoff function in order to save the batteries (see section 4.3.3). The automatic switchoff switches off the measuring instrument if no key is pressed for an adjustable period.
Operation Multi 3500i 4.2 General operating principles This section contains basic information of the operation of the Multi 3500i. Operating elements, display Operating modes, navigation An overview of the operating elements and the display is given in section 1.3 and section 1.4. An overview of the operating modes and navigation of the Multi 3500i is given in section 4.2.1 and section 4.2.2. 4.2.
Multi 3500i Operation 4.2.2 Measured value display Navigation In the measured value display, you can z select a measuring window with <▲> <▼> and open the relevant measuring menu by shortly pressing
Operation Multi 3500i z Functions Functions are designated by the name of the function. They are immediately carried out by confirming with
Multi 3500i Operation 4.2.3 1 Example 1 on navigation: Setting the language Press the key. The measured value display appears. The instrument is in the measuring ode. pH 7.00 25.0 °C 2 Open the system menu by pressing
Operation Multi 3500i 6 Open the General submenu with
Multi 3500i 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.
Operation 20 Multi 3500i 5 Change and confirm the setting with <▲> <▼> and
Multi 3500i Operation 4.3 System settings (system menu) The system menu comprises the following settings: z Data storage (see section 4.3.1) z Display (see section 4.3.2) z System (see section 4.3.3). 4.3.1 Data storage This menu contains all functions to display, edit and erase stored measured values and calibration records. Note Detailed information on the data storage functions of the Multi 3500i is given in section 4.8. 4.3.
Operation Multi 3500i Settings 22 To open the system menu in the measured value display, press the
Multi 3500i Operation 4.3.
Operation 24 Multi 3500i Menu item Setting Description System / Interface / Baud rate 1200, 2400, 4800, 9600, 19200 Baud rate of the data interface System / Interface / Output format ASCII CSV Output format for data transmission For details, see section 4.9 System / Interface / Header Yes No Option for output in csv format. "Yes" creates a header in the table. System / Clock function Time Date Date format Settings of time and date. For details, see section 4.2.
Multi 3500i Operation 4.4 pH value / ORP voltage 4.4.1 General information You can measure the following variables: z pH value [ ] z 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. Temperature measurement For reproducible pH measurements, it is essential to measure the temperature of the test sample.
Operation Multi 3500i The display of the temperature indicates the active temperature measuring mode: Temperature sensor Resolution of the temp. display Mode pH Cond or Oxi yes - 0.1 °C yes yes 0.1 °C - - 1 °C Manual - yes 0.
Multi 3500i Operation 4.4.2 Measuring the pH value 1 Perform the preparatory activities according to section 4.6.1. 2 Immerse the pH electrode in the test sample. pH 6.949 24.8 °C 3 AutoRead (Drift control) Criteria Select the pH or mV display with . The AutoRead function (drift control) continually checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of measured values.
Operation Multi 3500i 4.4.3 Measuring the ORP voltage Note ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution. 1 Perform the preparatory activities according to section 4.6.1. 2 Submerse the ORP electrode in the sample. U 157.0 mV 24.8 °C 3 AutoRead (drift control) Criteria 28 Select the mV display with . The AutoRead function (drift control) continually checks the stability of the measurement signal.
Multi 3500i Operation 4.4.4 Overview Settings for pH and ORP measurements The following settings are possible for pH and ORP measurements: z Resolution z Calibration interval z Buffers for calibration z Unit for slope z Calibration record (display) Settings The settings are made in the measuring menu of the pH/ORP measurement. To open the settings, activate the relevant measuring window in the measured value display and press the
Operation Multi 3500i 4.4.5 Why calibrate? When to calibrate? pH calibration pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry and slope of the electrode and stores them in the measuring instrument. Thus, you should calibrate at regular intervals.
Multi 3500i 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 measuring instrument determines the following values and calculates the calibration line as follows: 1-point Determined values Displayed calibration data ASY z Asymmetry = ASY z Slope = Nernst slope (-59.
Operation Display calibration data and output to interface Multi 3500i You can have the data of the last calibration displayed (see section 4.8.5). Subsequently, you can transmit the displayed calibration data to the interface, e. g. to a printer or PC, with the key. Note The calibration record is automatically transmitted to the interface after calibrating. Sample record: 03.11.03 07:14 CALIBRATION pH 03.11.03 07:10:45 Multi 3500i ser. no. 12345678 Cal.
Multi 3500i Calibration evaluation Operation 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 record Asymmetry [mV] Slope [mV/pH] +++ -15 ... +15 -60.5 ... -58 ++ -20 ... +20 -58 ... -57 + -25 ... +25 -61 ... -60.5 or -57 ... -56 - -30 ... +30 -62 ... -61 or -56 ...
Operation Multi 3500i 4.4.6 Carrying out the TEC and NIST/DIN calibration The two calibration procedures only differ in the usage of different buffer sets (see section 4.4.5). Make sure that the Calibration type is correctly set in the sensor menu (see section 4.4.4). For this procedure, use any one, two or three WTW technical buffer solutions in ascending or descending order. The TEC calibration is described below.
Multi 3500i Operation pH i Buffer value = 7.000 i U = 3.0 mV i Temperature = 24.8 °C Displayed: – Recognized nominal buffer value (referring to 25 °C) – current electrode voltage – current temperature value Terminate AutoRead 6 Wait for the end of the AutoRead measurement or accept the calibration value with
Operation Continuing for two-point calibration (Calibration type TEC) Multi 3500i 8 Thoroughly rinse the electrode with distilled water. 9 Immerse the electrode in buffer solution 2. 10 If the Set temperature menu item appears, measure and enter the temperature of the buffer manually (measurement without temperature sensor). 11 Select Continue with <▲> <▼> and press
Multi 3500i Continuing for threepoint calibration (Calibration type TEC) Operation 14 Thoroughly rinse the electrode with distilled water. 15 Immerse the electrode in buffer solution 3. 16 If necessary, measure the temperature of buffer 3 manually, then enter and confirm it with <▲> <▼> and
Operation Multi 3500i 4.4.7 Single-point calibration Two-point calibration Carrying out a ConCal 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. Use two buffer solutions for this procedure: z first buffer solution: pH 7.0 ± 0.5 z any other buffer solution For this calibration, Calibration type ConCal must be set in the sensor menu (see section 4.4.4).
Multi 3500i Operation pH i Buffer value = 6.80 i U = 12.0 mV i Temperature = 24.8 °C Terminate AutoRead 8 Wait for the end of the AutoRead measurement or Terminate AutoRead and accept the calibration value with
Operation Continuing for two-point calibration (Calibration type ConCal) Multi 3500i 10 Thoroughly rinse the electrode with distilled water. 11 Immerse the electrode in buffer solution 2. 12 Set the nominal buffer value with
Multi 3500i Operation 4.5 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.
Operation Multi 3500i Preparatory activities Perform the following preparatory activities when you want to measure: 1 Connect the ISE combination electrode to the measuring instrument. The pH/ISE measuring window is displayed. 2 If necessary, select the ISE display (unit, mg/l) with . 3 Measure the temperature of the test sample using a thermometer. 4 Calibrate or check the measuring instrument with the electrode. Note While no valid calibration is available, e.g.
Multi 3500i Operation adjust the temperature of the standard and measuring solutions accordingly. If the temperature difference is greater the [TempErr] warning appears in the measured value display. 4.5.3 Overview Settings for ISE measurements The following settings are possible for ISE measurements: z Calibration record (display) Settings The settings are made in the measuring menu of the ISE measurement.
Operation Multi 3500i Standard solutions Use two or three different standard solutions. For three-point calibration, the standard solutions have to be selected in either increasing or decreasing order. Standard solution Values [mg/l] Std 1 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20; 50; 100; 200; 500; 1000 If Std 2 > Std 1, Std 3 must be > Std 2 If Std 2 < Std 1, Std 3 must be < Std 2 Std 2 Std 3 The calibration line is calculated by linear regression.
Multi 3500i 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 Calibration evaluation 07:12:01 Multi 3500i 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 24.0 °C Slope 29.9 mV Sensor +++ After calibrating, the measuring instrument automatically evaluates the calibration.
Operation Preparatory activities Carrying out an ISE calibration Multi 3500i Perform the following preparatory activities when you want to calibrate: 1 Connect the ISE combination electrode to the measuring instrument. The pH/mV/ISE measuring window is displayed. 2 Keep the standard solutions ready. 3 Measure the temperature of the standard solutions using a thermometer.
Multi 3500i Operation ISE i Standard = 0.010 mg/l i U = 0.5 mV Terminate AutoRead 11 Wait for the end of the AutoRead measurement or accept the calibration value with
Operation Multi 3500i ISE i Standard = 0.020 mg/l i U = 8.4 mV Terminate AutoRead 20 Wait for the end of the AutoRead measurement or accept the calibration value with
Multi 3500i Operation 4.6 Dissolved oxygen 4.6.1 General information You can measure the following variables: z DO concentration z DO saturation index ("DO saturation") z DO partial pressure DO measurements with the Multi 3500i can be carried out using a ConOx, CellOx 325, DurOx 325 or StirrOx G DO sensor. The stirrer of the StirrOx G DO sensor has to be supplied with voltage separately using the NT/pH Mix 540 power supply.
Operation Preparatory activities Multi 3500i Perform the following preparatory activities when you want to measure: 1 Connect the DO sensor to the measuring instrument. The DO measuring window is displayed. 2 Calibrate or check the measuring instrument with the sensor. 4.6.2 Measuring 1 Perform the preparatory activities according to section 4.6.1. 2 Immerse the DO sensor in the test sample. O2 7.29 mg/l 25.
Multi 3500i Operation Note The ConOx double sensor can perform the salinity correction automatically. The conductivity module of the sensor measures the salt content of the test sample simultaneously with the DO. The measuring instrument takes the measured value into account. AutoRead (drift control) Criteria The AutoRead function (drift control) continually checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of measured values.
Operation Multi 3500i 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
Multi 3500i Operation 4.6.4 Why calibrate? When to calibrate? DO calibration 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. z After connecting another DO sensor z When the sensor symbol flashes (after the calibration interval has expired).
Operation Multi 3500i Sample record: 03.11.03 07:14 CALIBRATION ConOx 03.11.03 Calibration evaluation 07:12:58 Multi 3500i ser. no. 12345678 Cal. interval 14 d Relative slope 0.97 Sensor +++ 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. The relative slope has no effect on the measuring accuracy.
Multi 3500i Calibration in water vapor saturated air (air calibration vessel) Operation For this calibration procedure, the Comparison meas. setting must be set to Off in the measuring menu. Proceed as follows to calibrate the instrument: 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. 1 Put the DO sensor into the air calibration vessel. 2 Connect the DO sensor to the measuring instrument.
Operation Multi 3500i ConOx i Relative slope = 0.98 i Sensor+++ Accept 8 You have the following options: z Accept the new calibration values with
Multi 3500i Operation 5 Press
Operation Multi 3500i 4.7 Conductivity 4.7.1 General information You can measure the following variables: z Conductivity z Specific resistance z Salinity z Total dissolved solids (TDS) The measuring instrument is supplied with the following functions: z AutoRange (automatic switchover of the measurement range). If a measuring range is exceeded, AutoRange causes the measuring instrument to automatically change to the next higher measuring range and back again.
Multi 3500i Operation 4.7.2 Measuring You can carry out conductivity measurements as follows: 1 Perform the preparatory activities according to section 4.7.1. 2 Immerse the conductivity measuring cell in the test sample. 731 µS/cm 24.
Operation Multi 3500i 4.7.3 Temperature compensation The calculation of the temperature compensation is based on the preset 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 methods: z Nonlinear temperature compensation (nLF) according to EN 27 888 z Linear temperature compensation (Lin) with selectable coefficients of 0.000 ... 3.
Multi 3500i Operation 4.7.4 Overview Settings for conductivity measuring cells The following settings are possible for conductivity measuring cells: z Measured variable z Reference temperature z Temperature compensation z TDS factor z Calibration interval z Measuring cell/cell constant Settings The settings are made in the measuring menu of the conductivity measurement. To open the settings, activate the relevant measuring window in the measured value display and press the
Operation Multi 3500i Menu item Possible setting Description Temp. comp. (TC) / Linear coeff. 0.000 ... 3.000 %/K Coefficient of the linear temperature compensation. This setting is only available when the linear temperature compensation is set. Measuring cell 62 Measuring cell used Cal Measuring cells the cell constant of which is determined by calibration in the KCL control standard solution. Calibration ranges: 0.450 to 0.500 cm-1 and 0.800 to 1.
Multi 3500i Operation 4.7.5 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 determines the current value of the cell constant and stores this value in the instrument.
Operation Calibration evaluation Multi 3500i After the calibration, the measuring instrument automatically evaluates the current status of the calibration. The evaluation appears on the display and in the calibration record. Display Calibration record +++ Error Error Perform error elimination according to chapter 6 WHAT TO DO IF... Determining the cell constant Cell constant [cm-1] within the ranges 0.450 ... 0.500 cm-1 or 0.800 ... 1.200 cm-1 outside the ranges 0.450 ... 0.500 cm-1 or 0.800 ... 1.
Multi 3500i Operation 5 Press
Operation Multi 3500i 4.8 Data storage You can transmit measured values (data records) to the data storage in two ways: z Manual data storage (see section 4.8.1) z Automatic data storage at intervals (see section 4.8.2) Each storage process transmits the current dataset to the interface at the same time.
Multi 3500i Operation 4.8.1 Manual data storage Proceed as follows to transmit to the data data storage and simultaneously output to the interface a measurement dataset: 1 Press the key shortly. The menu for manual data storage appears. 1 of 504 - 30.10.2003 11:24:16 - pH 7.000 24.8 °C AR - Oxi 7.27 mg/l 25.0 °C AR - TDS 689 mg/l 25.0 °C AR Store with ID no.: 1 Continue 2 If the data storage is full If necessary, change and confirm the ID number (1 ...
Operation Multi 3500i 4.8.2 Automatic data storage at intervals The storage interval (Interval) determines the chronological interval between automatic storage processes. Each storage process transmits the current dataset to the interface at the same time. Configuring the automatic data storage function 1 Press the key for a long time. The menu for automatic data storage appears. Store with ID no.
Multi 3500i Data storage administration Operation The two lower display lines indicate the use of the data storage calculated in advance for the selected settings: Store with ID no.
Operation Terminating the automatic data storage function prematurely Multi 3500i Proceed as follows to switch off the automatic data storage function before the adjusted storage duration has expired: 1 Press the key for a long time. The following window appears. Warning Stop automatic storage? Yes No 2 4.8.3 Select and confirm Yes with <▲> <▼> and
Multi 3500i Operation Settings Menu item Setting/ function Description Data storage / Manual data storage / Display - Displays in pages all measuring datasets that correspond to the filter settings. Further options: z Scroll through the datasets with <▲> <▼>. z Output the displayed dataset to the interface with . z Quit the display with . Data storage / Manual data storage / Output to RS232 - Outputs to the interface all measuring datasets that correspond to the filter settings.
Operation Multi 3500i Data filter Menu item Setting/ function Filter Display presentation of a dataset 72 Description Filter criteria: No filter Data filter switched off Date & ID number Selection according to period and ID number ID number Selection according to ID number Date Selection according to period From TT.MM.JJ Until TT.MM.JJ Selects all datasets within the specified period. With ID 0 ... 999 30.10.2003 11:24:16 (1) ID number 1 - pH 7.000 24.8 °C AR - Oxi 7.27 mg/l 25.
Multi 3500i Sample printout Operation 3.11.03 15:48:08 Multi 3500i ser. no. 12345678 ID number: 1 ISE 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 Multi 3500i ser. no. 12345678 ID number: 1 pH 6.12 24.8 °C , AR Oxi 7.46 mg/l 24.8 °C Sal = 0.0 Res 69.0 kOhm*cm 24.8 °C , AR C = 0.010 1/cm, Tref25, Lin, TC = 2.000 %/K ________________________________________ 03.11.
Operation Multi 3500i 4.8.5 Displaying and outputting calibration records You can display the calibration data z of one selected sensor, or z of all sensors connected and then output them to the interface. Displaying the calibration record of a selected sensor The calibration record of the last calibration can be found under the Calibration / Calibration record menu item in the respective measuring menu.
Multi 3500i Sample printout Operation 03.11.03 07:14 CALIBRATION pH 03.11.03 07:10:45 Multi 3500i ser. no. 12345678 Cal. interval 7 d 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 Slope -60.2 mV/pH Asymmetry 3.0 mV Sensor +++ 03.11.03 07:14 CALIBRATION ISE 03.11.03 07:12:01 Multi 3500i ser. no. 12345678 Standard 1 0.010 mg/l Standard 2 0.020 mg/l Voltage 1 0.0 mV 24.
Operation Multi 3500i 4.9 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 interface in which way: Data Control Operation / description Current measured values of all connected sensors Manual z By pressing shortly. z Simultaneously with every manual data storage process (see section 4.8.1).
Multi 3500i 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.
Operation Multi 3500i 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. pH Oxi 78 The following settings for pH measurements are reset to the default settings with the Reset function: Setting Default settings Calibration type TEC Cal.
Multi 3500i 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-1 (calibrated) 0.475 cm-1 (set up) Temperature compensation nLF Reference temperature 25 °C Temperature coefficient (TC) of the linear temperature compensation 2.000 %/K TDS factor 1.
Operation 80 Multi 3500i
Multi 3500i Maintenance, cleaning, disposal 5 Maintenance, cleaning, disposal 5.1 Maintenance The measuring instrument is maintenance-free. 5.2 Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the housing with isopropanol as required. Caution The housing components are made out of synthetic materials (polyurethane, ABS and PMMA). Thus, avoid contact with acetone and similar detergents that contain solvents. Remove any splashes immediately.
Maintenance, cleaning, disposal Multi 3500i 2 1 1 Open the housing: – Undo the four screws on the underside of the instrument – Open the lower cover (1). 2 Measuring instrument 82 Take the four batteries (2) out of the battery compartment. Dispose of the measuring instrument without the rechargeable batteries as electronic waste at an appropriate collection point.
Multi 3500i Error message, OFL or UFL (measuring range exceeded or undercut) What to do if... 6 What to do if... 6.
What to do if...
Multi 3500i What to do if... 6.
What to do if... Multi 3500i 6.
Multi 3500i Measured value too high Sensor symbol flashes What to do if... Cause Remedy – High amount of dissolved substances – Correct solubility function using the salinity equivalent – Air bubbles bump on the membrane with high velocity – Avoid direct flow to the membrane – The carbon dioxide pressure is too high (> 1 bar) – Measuring not possible Cause Remedy – Calibration interval expired – Recalibrate the measuring system 6.
What to do if... Multi 3500i 6.5 Display, LoBat Instrument does not react to keystroke 88 General errors Cause Remedy – Batteries almost empty – Charge the batteries (see section 3.2) Cause Remedy – Operating condition undefined or EMC load unallowed – Processor reset: Press the and key simultaneously.
Multi 3500i Technical data Dimensions Weight Mechanical structure 7 Technical data 7.1 General data approx. 172 x 80 x 37 mm approx. 0.3 kg (without plug-in power supply) Type of protection IP 66 Electrical safety Protective class III Test certificates cETLus, CE Ambient conditions Power supply Serial interface Storage - 25 °C ... + 65 °C Operation -10 °C ... + 55 °C Climatic class 2 Rechargeable batteries 4 x 1.
Technical data Guidelines and norms used Multi 3500i EMC EC guideline 89/336/EEC 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.
Multi 3500i Measuring ranges, resolution Technical data 7.2 Measuring ranges, resolution, accuracy 7.2.1 pH/ORP Variable Measuring range Resolution pH - 2.000 ... + 20.000 - 2.00 ... + 20.00 0.001 0.01 U [mV] - 999.9 ... + 999.9 - 2000 ... + 2000 0.1 1 T [°C] - 5.0 ... + 105.0 0.1 Manual temperature input Variable Range Increment Tmanual [°C] - 20 ... + 130 1 Accuracy (± 1 digit) Variable Accuracy pH * ± 0.004 + 15 °C ... + 35 °C - 999.9 ... + 999.9 ± 0.2 + 15 °C ...
Technical data Multi 3500i 7.2.3 Measuring ranges, resolution Accuracy (± 1 digit) Correction functions 92 Dissolved oxygen Note: The values quoted in brackets apply especially for the DurOx 325 sensor. Variable Measuring range Resolution DO concentration [mg/l] 0 ... 20.00 (0 ... 20.0) 0 ... 90.0 (0 ... 90) 0.01 (0.1) 0.1 (1) Saturation [%] 0 ... 200.0 (0 ... 200) 0 ... 600 0.1 (1) 1 O2 partial pressure [mbar] 0 ... 200.0 (0 ... 200) 0 ... 1250 0.1 (1) 1 T [°C] 0 ... 50.0 0.
Multi 3500i Technical data 7.2.4 Measuring ranges, resolution Conductivity Variable Measuring range Resolution [µS/cm] 0.000 ... 2.000* 0.00 ... 20.00** 0.0 ... 200.0 0 ... 2000 0.001 0.01 0.1 1 [mS/cm] 0.00 ... 20.00 0.0 ... 200.0 0 ... 2000 0.01 0.1 1 Specific resistance [kOhm*cm] 0.000 ... 2.000 0.00 ... 20.00 0.0 ... 200.0 0 ... 2000 0.001 0.01 0.1 1 Specific resistance [MOhm*cm] 0.00 ... 20.00 0.0 ... 200.0 0 ... 2000 0.01 0.1 1 SAL 0.0 ... 70.0 according to the IOT table 0.
Technical data Accuracy (± 1 digit) Multi 3500i Variable Accuracy Temperature of the test sample / Temperature compensation None (Off) ± 0.5 % Nonlinear (nLF) ± 0.5 % 0 °C ... + 35 °C according to EN 27 888 ± 0.5 % + 35 °C ... + 50 °C Extended nLF function according to WTW measurements ± 0.5 % + 10 °C ... + 75 °C ± 0.1 + 5 °C ... + 25 °C ± 0.2 + 25 °C ... + 30 °C Linear (lin) SAL / range 0.0 ... 42.0 TDS [mg/l] ±1 T [°C] / temperature sensor 94 NTC 30 ± 0.2 0 °C ...
Multi 3500i Lists 8 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. However, terms that should already be familiar to the target group are not described here.
Lists Multi 3500i Abbreviations Conductivity value (international γ) 96 ASY Asymmetry Calibration type NIST/DIN Automatic pH calibration with buffer solutions prepared according to NIST or DIN 19 266 Calibration type TEC Automatic pH calibration with WTW technical buffer solutions according to DIN 19267 C Cell constant [cm-1] (internat.
Multi 3500i Lists TDS Total Dissolved Solids Tr20 Reference temperature of 20 °C Tr25 Reference temperature of 25 °C UFL Display range undercut (underflow) U Voltage 97
Lists Multi 3500i Glossary Adjusting To manipulate a measuring system so that the relevant value (e. g. the displayed value) differs as little as possible from the correct value or a value that is regarded as correct, or that the difference remains within the tolerance. Asymmetry Designation for the offset potential of a pH electrode.
Multi 3500i Lists Measured value The measured value is the special value of a measured parameter to be determined. It is given as a combination of the numerical value and unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K). Measured variable The measured parameter is the physical dimension determined by measuring, e. g. pH, conductivity or DO concentration. Measuring system The measuring system comprises all the devices used for measuring, e. g. measuring instrument and sensor.
Lists Multi 3500i Salinity Salt content Setting the temperature compensation Slope Slope (relative) Standard solution TDS Temperature coefficient The absolute salinity SA of seawater corresponds to the relationship of the mass of dissolved salts to the mass of the solution (in g/Kg). In practice, this dimension cannot be measured directly. Therefore, the practical salinity is used for oceanographic monitoring. It is determined by measuring the electrical conductivity.
Multi 3500i 9 Index Index A Air calibration vessel ................................53 Asymmetry of the pH electrode .................30 Authorized use ...........................................9 Automatic switchoff ............................11, 13 AutoRead DO ..............................................51, 53 ISE ....................................................42 ORP ..................................................28 pH .....................................................27 Display ........
Index MultiLab pilot .......................................... 77 O Obligations of the purchaser ..................... 10 Operating safety ...................................... 10 P pH calibration evaluation .......................... 33 Plug-in power supply ............................... 11 Print ....................................................... 76 R Reset ..................................................... 78 RS232 socket assignment ....................... 77 S Safe operation .............
Multi 3500i Appendix: Firmware Update Appendix: Firmware Update General The program "Firmware Update 350i" enables you to update the firmware of the Multi 3500i 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 3500i). Program installation Together with the program "Multi350i_Vx_yy_English.exe", you install the firmware update program on your PC.
Appendix: Firmware Update 104 Multi 3500i
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