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VWR avantor PH/CO-2500L Instruction Manual

Ph/conductivity meter
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Instruction manual
VWR
®
pH/CONDUCTIVITY METER PH/CO-2500L
EU cat. no
665-0561
Version 1.1 Issue: 12.2021

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Summary of Contents for VWR avantor PH/CO-2500L

  • Page 1 Instruction manual ® pH/CONDUCTIVITY METER PH/CO-2500L EU cat. no 665-0561 Version 1.1 Issue: 12.2021...
  • Page 2 Legal address of Manufacturer Europe VWR International bv, Researchpark Haasrode 2020 Geldenaaksebaan 464 B-3001 Leuven +3216385011 be.vwr.com UK Importer: VWR International Ltd Hunter Boulevard, Magna Park Lutterworth, Leicestershire, LE17 4XN uk.vwr.com Country of Origin POLAND...
  • Page 3 CONTENT I. INTRODUCTION........................1 1. Package content......................2 2. Disclaimer........................2 3. Characteristics of the meter..................3 4. The outside view......................4 5. The meter‘s maintenance...................6 6. Switching the meter on and off...................7 6.1. Choosing the measurement function..............8 6.2. Stabilised reading.....................9 7. Preparation to work....................9 7.1.
  • Page 4 17.1. Salinity measurement with conversion to NaCl or KCl.........44 18. Notices about temperature compensation.............45 18.1. Natural water....................45 18.2. Ultra pure water....................45 IV. REDOX POTENTIAL AND TEMPERATURE MEASUREMENT.........47 19. Setting the redox potential parameters..............48 19.1. Resolution.....................49 19.2. Relative measurement..................49 19.3. Reference voltage..................49 20.
  • Page 5 - 1 - INTRODUCTION...
  • Page 6 - 2 - PACKAGE CONTENT 1. PH/CO-2500L pH/conductivity meter. 2. Glass combination pH electrode. 3. Stainless steel temperature sensor 4. pH 4,00 , pH 7,00, pH 10,00 buffer solution, 50 ml each. 5. Electrolyte – saturated KCl – 50 ml. 6.
  • Page 7 - 3 - CHARACTERISTICS OF THE METER PH/CO-2500L waterproof pH/conductivity meter belongs to the newest generation of measuring devices. The meter provides high accuracy and repeatability of readings. The meter’s memory is independent from power supply. The meter is equipped with a large backlit custom LCD, which can simultaneously display pH, conductivity and temperature readings.
  • Page 8 - 4 - THE OUTSIDE VIEW On the front wall of the meter there is a graphic LCD placed (Pic. 1), on which the following readings are displayed: pH or redox potential in mV units; conductivity or salinity, TDS, resistivity; temperature.
  • Page 9 - 5 - button (Pic. 2) placed below the display is used for switching the meter on and off. In the back wall of the meter the sockets are placed with the symbols given below: pH/mV BNC-50 socket for connecting the combination pH or redox electrode;...
  • Page 10 - 6 - THE METER‘S MAINTENANCE The meter is equipped with a graphic touchscreen. The maintenance consists in pressing particular keys and windows which appear on the screen. Grey captions in the windows and keys inform that these elements are not active in this particular operating mode.
  • Page 11 - 7 - SWITCHING THE METER ON AND OFF After switching the meter on with the button, the memory test proceeds. If the test ends successfully, the meter enters the measurement screen with settings entered before switching it off previously. In case of detecting the manufacturer‘s calibration data loss, the following information will appear: Pressing the button accepts standard manufacturer‘s calibration...
  • Page 12 - 8 - 6.1. Choosing the measurement function The user may choose the reading to be displayed on the upper left side of the measuring screen: pH or redox potential. To choose, on the measuring screen press the button, the option screen will display with the tab open containing the previously set configuration (Pic.
  • Page 13 - 9 - 6.2. Stabilised reading The stabilised reading signalisation is active only for the reading marked with a frame. If the measured value meets the criterium of the stabilised reading, it is signalised by green colour of the frame and additionally with a sound if it has been activated.
  • Page 14 - 10 - pH MEASUREMENT User‘s manual for PH/CO-2500L pH/conductivity meter v1.0x...
  • Page 15 - 11 - PREPARATION OF THE pH ELECTRODE The electrode should be prepared to work according to the manufacturer’s instructions. It is especially important to keep the membrane active and clean, rinse it accurately after each measurement and dry it gently with a tissue paper.
  • Page 16 - 12 - When the parameters are set, return to the measurement screen by pressing button. 9.1. Resolution The reading can be displayed with low or high resolution. By pressing the RESOLUTION window, choose: - 0.01 pH measurement resolution; - 0.001 pH measurement resolution. 9.2.
  • Page 17 - 13 - 9.3. Calibration solution Displays types of calibration solutions applied for the last calibration: - calibration with manually entered buffers‘ values; - calibration with automatic correction of the standards‘ values. Calibration in buffers and standards is described in detail in the chapter 10. The types of calibration solutions are stored for each of the three electrodes separately and may be changed only in the calibration mode (point 10.2).
  • Page 18 - 14 - 10. CALIBRATION Before starting measurement with a new electrode or before making measurements which require high accuracy, the electrode connected to the meter should be calibrated. Results of measurements made without calibration will be burdened with a significant error. Calibration is performed in the buffer or standard solutions.
  • Page 19 - 15 - Calibration with use of one solution does not guarantee high accuracy. If only one solution is used, its value should be close to the anticipated value of the measured solution. If the required accuracy isn’t very high and the measurements are made in the whole range, 1-point calibration should be performed with use of solution close to 7.00 pH.
  • Page 20 - 16 - 10.2. Entering the buffers’ values into the meter’s memory If the calibration with use of buffers has been chosen and the pH values set by the manufacturer are used, there is no need to change them. However, it should be verified whether the values correspond to those of applied buffers.
  • Page 21 - 17 - Pic. 6 Each of the calibration points has its own range of pH buffers values to enter. This limitation enables automatic detection of the buffer solutions by the meter. Table 1 contains the manufacturer’s settings of the pH buffer solutions values used for calibration.
  • Page 22 - 18 - The meter takes into account only the values detected during calibration. The pH values stored in unused calibration points do not affect the calibration results. During next calibrations there is no need to perform the actions described above, provided that the previously used buffer solutions haven’t been changed.
  • Page 23 - 19 - Pic. 7. If the meter is unable to detect the buffer‘s value, it will signalise the error after pressing the button with a tripple warning sound. In such case check the solution value or the electrode which may be broken. Only the pH buffers values detected during calibration are calculated, any other values recorded earlier do not influence the reading.
  • Page 24 - 20 - After finishing calibration in the first buffer rinse the electrode and temperature probe in distilled water and dry them with tissue paper and start calibration in next buffers (Pic. 7.C) by repeating the last point of the activities described above.
  • Page 25 - 21 - When the reading stabilises, press the button. Next to the detected buffer value the marking will appear, what informs that the calibration value has been recorded. Simultaneously, the measurement value will be adjusted to the detected buffer value. If the reading is still different than the solution value, wait until the reading stabilises and press the button again.
  • Page 26 - 22 - 11. CHECKING THE ELECTRODE CONDITION After pH electrode calibration the meter calculates its parameters: offset in pH units and slope defined also as efficiency in percents. The electrode offset may be defined in pH or mV units. An ideal electrode immersed in the 7.00 pH buffer before calibration should indicate 7.00 pH which equals 0.00 mV.
  • Page 27 - 23 - 12. pH MEASUREMENT Before starting measurement the meter and the pH electrode have to be prepared for work (chapters 7 and 8 respectively). Good condition of the electrode is crucial for correct readings. If the electrode is calibrated, choose its number according to the section 9.2 and the measurement resolution according to the section 9.1.
  • Page 28 - 24 - 12.2. Measurement with manual temperature compensation Disconnecting the temperature probe from the meter switches the meter to the manual temperature compensation mode. Next to the entered (not measured) temperature value, instead of the symbol, the symbol is displayed (Pic.
  • Page 29 - 25 - III. CONDUCTIVITY AND SALINITY MEASUREMENT...
  • Page 30 - 26 - 13. ENTERING THE CONDUCTIVITY PARAMETERS Before starting calibration and measurements it is necessary to perform all activities described in the chapter 7. Additionally, according to the chapter below, it is necessary to choose the unit in which the calibration and measurement are going to be made.
  • Page 31 - 27 - When the parameters are entered, return to the measurement screen by pressing the button. 13.1. Resolution The reading may be displayed with low or high resolution. After pressing the RESOLUTION window, choose: - 3½ digit measurement resolution; - 4½...
  • Page 32 - 28 - Pic. 10 Choose the unit by pressing the relevant window. In case of choosing S/cm and  * cm unit, at the bottom of the screen the position and the window with the chosen compensation COMPENSATION mode with appear. In case of measurements in g/l NACL, % NACL, g/l KCL, % KCL, g/l TDS, % TDS units, the position does not appear.
  • Page 33 - 29 - 13.4. Calibration points and date Pressing the button opens a screen (Pic. 10C) which displays calibration modes, calibration points, K constant in these points, calibration validity time and the last calibration date. In the calibration mode MANUAL only P1 point is active.
  • Page 34 - 30 - 13.7. Entering the a coefficient The a coefficient range in PH/CO2500L is 0 ÷ 10.00 % / C with accuracy 0.01 % / C. Generally for measurements, the most frequently applied temperature compensation coefficient is equal a = 2 % / C.
  • Page 35 - 31 - 14. MAINTENANCE OF THE CONDUCTIVITY CELL The delivered in the set conductivity cell with a range 0 ÷ 400 mS/cm is sufficient for measurements in almost every type of liquids with maximal concentration. Metal electrodes are easy to clean and plastic body provides higher durability.
  • Page 36 - 32 - 15. CALIBRATION A characteristic feature of every conductivity cell is its K constant. Before the result is displayed, the measured value is multiplied by the K constant value. In practice, the K constant is determined by calibration in standard solution. The user may calibrate in two ways: by entering known K constant value (given by the cell’s manufacturer) or by determining it with use of a standard solution.
  • Page 37 - 33 - Entering the calibration mode irreversibly erases the cell’s K constant stored under the chosen cell number. In case of choosing the cell number, entering and escaping the calibration mode not having made calibration, the previously stored K constant will be deleted and K = 1 cm constant will be adopted.
  • Page 38 - 34 - Pic. 11. 15.2. Calibration with use of standard solution The K constant of the conductivity cell changes with the conductivity value of the measured solution. The purpose of multi-point calibration is to suppress this effect. The meter enables 3-point calibration in freely chosen standard solutions.
  • Page 39 - 35 - To obtain accurate results of calibration, comply to the following principles: 1. For multi-point calibration start with the standard solution of the lowest conductivity value and end with one of the highest. 2. The temperature of the standards should be equal to the reference temperature (the most frequently it is 25 3.
  • Page 40 - 36 - Pic. 12. 15.2.2. Calibration with automatic temperature compensation Follow the instructions: - choose the cell number (E1, E2 or E3), according to the point 13.2; - connect the conductivity cell and the temperature probe; - enter the calibration mode: on the measurement screen select the conductivity measurement, press and hold the button until the background changes colour to red, the meter will automatically change...
  • Page 41 - 37 - Pic. 13. Blinking frame around the calibration point informs, that the difference between the reading and the standard is significant, the meter will signalise the error with a triple warning sound after pressing the button. When the calibration process is finished, the meter is ready for the measurement.
  • Page 42 - 38 - 15.2.3. Calibration with manual temperature compensation To calibrate the meter: - disconnect the temperature probe; - measure the temperature of the solution with a laboratory thermometer and enter its value according to section 21.5; - enter the calibration mode: select the conductivity measurement on the measurement screen, press and hold the button until the background changes colour into red, the meter will automatically change...
  • Page 43 - 39 - Pic. 14 Blinking frame around the calibration point informs, that the difference between the reading and the standard is significant, the meter will signalise the error with a tripple warning sound after pressing the button. When the calibration process is finished, the meter is ready for the measurement.
  • Page 44 - 40 - 16. CONDUCTIVITY MEASUREMENT 16.1. Measurement without temperature compensation An accurate conductivity measurement should be performed without the temperature compensation. The measured solution should be adjusted to the reference temperature chosen earlier (25 °C or 20 °C), with use of the temperature measurement provided by the meter.
  • Page 45 - 41 - 16.2. Measurement with automatic temperature compensation Follow the instructions: connect the conductivity cell and the temperature probe to the Con and t sockets respectively (Pic. 2); turn the meter on with choose the conductivity measurement mode (section 13.3); if the conductivity cell is not calibrated, calibrate it (chapter 15);...
  • Page 46 - 42 - 16.3. Measurement with manual temperature compensation Measurement with manual temperature compensation may be performed in stable working conditions, i.e., measurements in laboratory, especially with use of thermostat, or in case of the temperature probe breakdown. Disconnecting the temperature probe switches the meter to manual temperature compensation.
  • Page 47 - 43 - 17. SALINITY AND TOTAL DISSOLVED SOLIDS MEASUREMENT Salts and minerals dissolved in natural water influence the conductivity, which in principle is proportional to the quantity of dissolved substances. This dependence enables to determine, after certain calculations, salinity of the measured solution in concentration units (g/l or %), or to determine the TDS (Total Dissolved Solids).
  • Page 48 - 44 - The results are more accurate for homogeneous solutions (NaCl, KCl). Concentration of salts mixture with unknown composition in most cases is counted to NaCl. The usefulness of water for home or industry is usually checked by determining of TDS. It is possible to determine the approximate Total Dissolved Solids content using the conductivity reading on the assumption that the salt’s composition in the taken samples has not been changing significantly.
  • Page 49 - 45 - 18. NOTICES ABOUT TEMPERATURE COMPENSATION 18.1. Natural water The meter enables reduction of the temperature compensation error in case measurements natural water with conductivity range 60 µS/cm ÷ 1 mS/cm. Natural water is the surface water and the ground water.
  • Page 50 - 46 - In case of water with conductivity C=0.5µS/cm at 25 °C the α coefficient values at other temperature are as follows: T=26.0ºC T=50.0ºC T=69.9ºC conductivity α coef. conductivity α coef. conductivity α coef. 0.532µS/cm 5.81% 1.50µS/cm 8.55% 3.20µS/cm 11.96% 0.512µS/cm 2.07%...
  • Page 51 - 47 - REDOX POTENTIAL AND TEMPERATURE MEASUREMENT...
  • Page 52 - 48 - 19. SETTING THE REDOX POTENTIAL PARAMETERS The redox potential (ORP) parameters window is entered by selecting the redox potential reading (a frame will be displayed around it – Pic. 18A) and button. The screen (Pic. 18B) enables choosing the resolution, the reference temperature and setting the zero offset for the relative measurement.
  • Page 53 - 49 - After setting the parameters return to the measurement screen by pressing button. If the relative measurement has been chosen, next to the redox value the Rel symbol (Relative) will appear (Pic. 18C). The difference between the redox potential value and the reference value is displayed.
  • Page 54 - 50 - 20. REDOX POTENTIAL MEASUREMENT PH/CO-2500L is an accurate voltmeter. The measurement may be made with redox electrode or during titration. To make measurement: - turn the meter on by pressing the button; - choose the redox potential measurement to be displayed on the measuring screen according to the point 23.1;...
  • Page 55 - 51 - 21. SETTING THE TEMPERATURE MEASUREMENT PARAMETERS The temperature measurement parameters window is entered by selecting the temperature reading (Pic. 20A) and next the button (Pic. 20B). The screen enables choosing resolution, probe group, unit and entering the manual temperature compensation value.
  • Page 56 - 52 - 21.2. Probe number The meter may store parameters of three probes, which may be replaced without the need of entering the group again, only the number which symbolises the sensor group has to be selected. By pressing the PROBE NO.
  • Page 57 - 53 - 22. TEMPERATURE MEASUREMENT Follow the instructions: - turn the meter on by pressing the button - connect the temperature probe to the RCA (Chinch) socket, the symbol will appear on the screen; - immerse the temperature probe into the solution; - wait till the value stabilises and read the result.
  • Page 58 - 54 - OPTIONS User‘s manual for PH/CO-2500L pH/conductivity meter v1.0x...
  • Page 59 - 55 - 23. OPTION SCREEN Enter the screen by pressing the button in the measurement OPTION screen. The screen contains the following tabs: OPTION - choose the measurement functions to be displayed on the FUNCTION measurement screen; - parameters for collecting measurement series; SERIES - choose the language, set the economical mode, time and MISCELLANEOUS...
  • Page 60 - 56 - 23.2. Series For the description of the tab, see the chapter 24. SERIES 23.3. Miscellaneous On this screen (Pic. 23A) the following parameters may be entered: LANGUAGE - choosing the language: English, German, French, Spanish, Italian, Portugese (Pic. 23B); SOUND - turning the buttons sound on / off;...
  • Page 61 - 57 - Pic. 23...
  • Page 62 - 58 - To enter a logical value (language, sound, brightness), press the chosen window, a table will appear to choose the value. To enter a numerical value, press the chosen window, a numerical keyboard will appear to enter the value and confirm with the button.
  • Page 63 - 59 - 24. RECORDING THE READINGS, MEMORY READOUT The meter enables recording 500 readings of the displayed measurement functions. The readings are stored in memory independently from power supply. Before the measurement set the storage parameters for the readings. 24.1.
  • Page 64 - 60 - To enter the interval or number of samples, press the chosen window, a numerical keyboard will appear to enter the value and confirm with the button. If in the position is set to , the MODE STOP INTERVAL NUMBER OF positions are unavailable.
  • Page 65 - 61 - 24.3. Collecting measurement series There is a possibility to automatically store series of measurements in the meter’s memory. Follow the instructions: - choose automatic collection of readings (point 24.1); - enter the time interval and number of samples (point 24.1); - return to the measurement screen with the button;...
  • Page 66 - 62 - 24.4. Mode of holding readings (HOLD) If in the position option has been chosen, than on the measuring MODE STOP screen in the place of the button the button will appear. Pressing this button holds all the readings, the green frame displays around them and the button appears at the bottom of the screen (Pic.
  • Page 67 - 63 - 24.5. Viewing the readings The stored readings may be viewed on the meter‘s screen. Follow the instructions: - on the measurement screen press the button and choose the tab on the option screen; MEMORY - press the button.
  • Page 68 - 64 - 25. CALIBRATION REPORT During calibration process in each of the measurement functions the meter creates a calibration report, which includes information about calibration points, measurement results in these points and calculated parameters as: efficiency and offset of the pH electrode and K constant of the conductivity cell.
  • Page 69 - 65 - - "Download calibration data" enables downloading the calibration data from the meter. Choose the measuring function in the meter to collect its report. In this option choose: „Name“ - the meter's name will be given to each report. At least one of the other following options needs to be selected with this one;...
  • Page 70 - 66 - 27. TECHNICAL DATA pH MEASUREMENT: accuracy range resolution (±1 digit) -6.000  20.000 pH 0.001 / 0.01 pH ±0.002 pH >10 12  Input impedance: Temperature compensation: manual/automatic Compensation range: -5.0 ÷ 110.0 pH electrode calibration: automatic, in 1 ...
  • Page 71 - 67 - Temperature compensation: manual/automatic Compensation range: -5.0 ÷ 70.0 0.010  20.000 cm K constant range: 0.00  10.00 %/ α coefficient range: 0.20  1.00 TDS coefficient range: 0  239 g/l (0 ÷ 21.00 %) Measuring range for conversion to KCl: 0 ...
  • Page 72 - 68 - 28. ORDERING INFORMATION EPH-1 standard glass pH electrode & 1 meter cable 662-2381 REG-1 glass ORP (redox) electrode 1 meter cable 662-2357 TS-2B stainless steel temperature sensor 1meter cable 442-1264 ECS-1 conductivity cell constant K-0.45 0 – 400 mS/cm 663-0373 Buffer solutions, 20 °C AVS TITRINORM: pH 4...
  • Page 73 The customer is responsible for applying for and obtaining the necessary regulatory approvals or other authorisations necessary to run or use the Product in its local environment. VWR will not be held liable for any related omission or for not obtaining the required approval or authorisation, unless...
  • Page 74 - 70 - 31. EQUIPMENT DISPOSAL This equipment is marked with the crossed out wheeled bin symbol to indicate that this equipment must not be disposed of with unsorted waste. Instead it's your responsibility to correctly dispose of your equipment at lifecycle -end by handling it over to an authorized facility for separate collection and recycling.
  • Page 75 Austria Hungary Poland VWR International GmbH VWR International Kft. Graumanngasse 7 Simon László u. 4. VWR International Sp. z o.o. 1150 Vienna 4034 Debrecen Limbowa 5 Tel.: +43 1 97 002 0 Tel.: +36 (52) 521-130 80-175 Gdansk Email: info.at@vwr.com Email: info.hu@vwr.com...