wtw pH 7310 Operating Manual
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wtw pH 7310 Operating Manual

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Operating manual
pH 7310
pH 7310P
pH 7310P
pH 7310
pH meter
ba75929e02
10/2011

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  • Page 1 Operating manual pH 7310 pH 7310P pH 7310P pH 7310 pH meter ba75929e02 10/2011...
  • Page 2 7310 © Copyright Weilheim 2011, WTW GmbH Reproduction in whole - or even in part - is prohibited without the express writ- ten permission of WTW GmbH, Weilheim. Printed in Germany. ba75929e02 10/2011...

  • Page 3: Table Of Contents

    7310 meter ........
  • Page 4 Contents pH 7310 pH value......... . 22 Measuring .
  • Page 5 7310 Contents 10.2 Operation / printing ....... . . 55 10.3 Printer settings .

  • Page 6: Overview

    7310 Overview pH 7310 meter The compact pH 7310 precision pH meter enables you to perform pH measure- ments rapidly and reliably. The pH 7310 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.

  • Page 7: Ph 7310P Meter With Integrated Printer

    4 Printer 5 Control panel of the printer Sensors A measuring system ready to measure consists of the pH 7310 meter and a suitable sensor. Suitable sensors are pH electrodes and ORP electrodes. Information on available sensors is given on the Internet and in the WTW catalog, "Laboratory and field instrumentation".

  • Page 8: Safety

    Safety pH 7310 Safety Safety information 2.1.1 Safety information in the operating manual This operating manual provides important information on the safe operation of the meter. Read this operating manual thoroughly and make yourself familiar with the meter before putting it into operation or working with it. The operating manual must be kept in the vicinity of the meter so you can always find the infor- mation you need.

  • Page 9: Safe Operation

    7310 Safety Safe operation 2.2.1 Authorized use This meter is authorized exclusively for pH and ORP measurements in the laboratory. Only the operation and running of the meter according to the instructions and technical specifications given in this operating manual is authorized (see section 13 T , page 62).

  • Page 10: Commissioning

    – comprehensive operating manual – software MultiLab Importer Power supply The pH 7310 is supplied with power in the following ways:  Mains operation with the supplied power pack  Battery operation (4 x alkaline manganese batteries, type AA)  USB operation via a connected USB-B cable...

  • Page 11: Inserting The Batteries

    7310 Commissioning 3.3.1 Inserting the batteries You can operate the meter either with normal batteries or with rechargeable batteries (Ni-MH). In order to charge the batteries, an external charging device is required. 1 Battery compartment Open the battery compartment (1) on the underside of the meter.

  • Page 12: Connecting The Power Pack

    ECHNICAL DATA page 62). Connect the plug of the power pack to the socket for the power pack on the pH 7310. Connect the original power pack to an easily accessible power outlet. 3.3.3 Mounting the stand The stand base can be mounted at the right side of the meter.

  • Page 13: Operation

    7310 Operation Operation General operating principles 4.1.1 Keypad In this operating manual, keys are indicated by brackets <..> . The key symbol (e.g. <ENTER>) generally indicates a short keystroke (under 2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indicated by the underscore behind the key symbol (e.g.

  • Page 14: Display

    Operation pH 7310 4.1.2 Display 6.093 25.0 °C AutoCal TEC HOLD AR 01.07.2011 Menu USB output 08:00 1 Status information (sensor) 2 Measured value (with unit) 3 Measured parameter 4 Continuous measurement control (CMC function) 5 Sensor symbol (calibration evaluation, calibration interval)

  • Page 15: Socket Field

    7310 Operation 4.1.4 Socket field 1 pH electrode 2 Reference electrode 3 Temperature sensor 4 Mini USB-B interface 5 Power pack 6 Service interface CAUTION Only connect sensors to the meter that cannot return any volt- ages or currents that are not allowed (> SELV and > current circuit with current limiting).

  • Page 16: Switching Off

    Operation pH 7310 Switching off Press the <On/Off> key. Automatic switch-off The instrument has an automatic switch-off function in order to save the function batteries (see section 7.3.1 S , page 43). The automatic switchoff YSTEM switches off the measuring instrument if no key is pressed for an adjustable period.

  • Page 17: Menus And Dialogs

    7310 Operation Operating Description mode Measuring The measurement data of the connected sensor are shown in the measured value display Calibration The course of a calibration with calibration information, func- tions and settings is displayed Storage in The meter stores measuring data automatically or manually...

  • Page 18: Example 1 On Navigation: Setting The Language

    Operation pH 7310 General Language: English Beep Illumination Contrast 50 % Switchoff time 01.07.2011 Back 08:00  Functions Functions are designated by the name of the function. They are immediately carried out by confirming with <ENTER>. Example: Display the Calibration record function.
  • Page 19 7310 Operation 6.949 25.0 °C 01.07.2011 Menu USB output 08:00 Using <F1_>/[Menu], open the Storage & config menu. The instrument is in the setting mode. Storage & config System Data storage 01.07.2011 Back 08:00 Select the System submenu with <><>.

  • Page 20: Example 2 On Navigation: Setting The Date And Time

    Operation pH 7310 General Language: English Beep Illumination Contrast 50 % Switchoff time 01.07.2011 Back 08:00 Open the setting mode for the Language with <ENTER>. General Language: English Beep Illumination Contrast 50 % Switchoff time 01.07.2011 Back 08:00 Select the required language with <><>.
  • Page 21 7310 Operation The date format can be switched from the display of day, month, year (dd.mm.yyyy) to the display of month, day, year (mm/dd/yyyy or mm.dd.yyyy). In the measured value display: Using <F1_>/[Menu], open the Storage & config menu.

  • Page 22: Ph Value

    7310 pH value Measuring 5.1.1 Measuring the pH value When connecting an earthed PC/printer, measurements cannot be performed in earthed media as the values would be incorrect. The USB interface is not galvanically isolated. To ensure the high measurement accuracy of the measuring sys- tem, always measure with a calibrated electrode (see section 5.2...
  • Page 23 7310 pH value Freeze the measured value with <AR>. The [HOLD] status indicator is displayed. The HOLD function is active. You can terminate the Stability control function and the HOLD func- tion with <AR> or <M> at any time.

  • Page 24: Measuring The Temperature

    7310 5.1.2 Measuring the temperature For reproducible pH and ORP measurements, it is essential to measure the temperature of the test sample. You have the following options to measure the temperature:  Automatic measurement of the temperature with the temperature sensor (NTC 30 or Pt 1000) integrated in the sensor.

  • Page 25: Calibration

    7310 pH value Calibration 5.2.1 Why calibrate? pH electrodes age. This changes the zero point (asymmetry) and slope of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines and stores the current values of the zero point and slope of the electrode.
  • Page 26 7310 Buffer -180.0 24.8 °C AutoCal TEC 01.07.2011 08:00 Thoroughly rinse the electrode with deionized water. Immerse the electrode in the first buffer solution. When measuring without temperature sensor: Measure the temperature of the buffer and enter it with <><>.
  • Page 27 7310 pH value Start the measurement with <ENTER>. The measured value is checked for stability (stability control). The [AR] status indicator is displayed. A progress bar is displayed and the display of the measured parameter flashes. 7.000 Buffer 24.8 °C AutoCal TEC 01.07.2011...

  • Page 28: Manual Calibration (Concal)

    7310 Wait for the measurement with stability control to be completed or termi- nate the stability control and take over the calibration value with <ENTER>. The calibration display for the next buffer appears (voltage display). If necessary, use <M> to finish calibration or Continue calibrating using the next buffer with <ENTER>.
  • Page 29 7310 pH value Immerse the electrode in the first buffer solution. When measuring without temperature sensor: Measure the temperature of the buffer and enter it with <><>. Start the measurement with <ENTER>. The measured value is checked for stability (stability control). The [AR] status indicator is displayed.
  • Page 30 7310 Immerse the electrode in the second buffer solution. When measuring without temperature sensor: Measure the temperature of the buffer and enter it with <><>. Start the measurement with <ENTER>. The measured value is checked for stability (stability control). The [AR] status indicator is displayed.

  • Page 31: Calibration Points

    7310 pH value Buffer 9.958   24.8 °C ConCal 01.07.2011 08:00 Set the nominal buffer value for the measured temperature with <><>. Accept the set calibration value with <ENTER>. The calibration display for the next buffer appears (voltage display).

  • Page 32: Calibration Data

    7310 5.2.6 Calibration data The calibration record is automatically transmitted to the interface after calibrating. Displaying the cali- The calibration record of the last calibration is to be found under the menu item, bration data <F1> / [Menu]Calibration / Calibration record. To open it, press the <CAL_>...
  • Page 33 Error - 30 ... + 30 -62,0 ... -50,0 Error elimination (see section 12 W ..., page 59) TO DO IF Calibration record inoLab pH 7310 (example) Ser. no. 11292113 CALIBRATION pH 30.06.2011 15:55 Ser. no. 10501234 AutoCal TEC Buffer 1 4.01...

  • Page 34: Continuous Measurement Control (Cmc Function)

    7310 5.2.7 Continuous measurement control (CMC function) The Continuous Measurement Control (CMC function) facilitates to evaluate the current measured value instantly and definitely. After each successful calibration the scale of the pH measuring range is displayed in the measured value display. Here you can very clearly see whether or not the current measured value is in the calibrated part of the measuring range.

  • Page 35: Orp Voltage

    7310 ORP voltage ORP voltage Measuring 6.1.1 Measuring the ORP When connecting an earthed PC/printer, measurements cannot be performed in earthed media as the values would be incorrect. The USB interface is not galvanically isolated. Connect the ORP electrode to the meter.
  • Page 36 ORP voltage pH 7310 Measured parame- Time interval Stability in the time interval ORP voltage 15 seconds Δ mV: Better than 0.3 Temperature 15 seconds Δ T (° C): Better than 0.02 The minimum duration until a measured value is assessed as stable is the monitored time interval.

  • Page 37: Measuring The Temperature

    7310 ORP voltage Release the frozen measured value again with <AR>. The HOLD function is switched off. The [HOLD] status display disappears. 6.1.2 Measuring the temperature For reproducible ORP measurements, it is essential to measure the tempera- ture of the test sample.

  • Page 38: Settings

    Settings pH 7310 Settings Measurement settings 7.1.1 Changing the settings for pH measurements The settings are made in the menu for calibration and measurement settings of the pH/ORP measurement. To open the settings, display the required parame- ter in the measured value display and press the <F1>/[menu] or <ENTER> key.

  • Page 39: Buffer Sets For Calibration

    7310 Settings Menu item Possible set- Description ting Calibration /Buffer Buffer sets to be used for pH cali- NIST/DIN bration (see section 5.2 C ALIBRA ConCal , page 25). TION Calibration /One Quick calibration with 1 buffer point calibration Calibration /Cali- 1 ...
  • Page 40 Settings pH 7310 Buffer set * pH values ConCal NIST/DIN 1.679 25 °C DIN buffers according to DIN 19266 4.006 and NIST Traceable Buffers 6.865 9.180 12.454 2.000 25 °C WTW Technical buffers 4.010 7.000 10.011 Merck 1* 4.000 20°C 7.000...
  • Page 41 7310 Settings Buffer set * pH values Fluka BS * 4.006 25 °C 6.984 8.957 Radiometer * 1.678 25 °C 4.005 7.000 9.180 Baker * 4.006 25 °C 6.991 10.008 Metrohm * 3.996 25 °C 7.003 8.999 Beckman * 4.005...

  • Page 42: Calibration Interval

    Settings pH 7310 The buffers are selected in the menu, pH / <F1>/[Menu] / Calibra- tion / Buffer (see 7.1.1 C HANGING THE SETTINGS FOR P MEASURE 38). MENTS PAGE 7.1.3 Calibration interval The calibration evaluation is displayed as a sensor symbol.

  • Page 43: Sensor-Independent Settings

    7310 Settings Menu item Possible Description setting Resolution mV Resolution of the mV display Stability control Switches on or off the automatic stability control during measurement (see sec- tion Stability control (AutoRead) & HOLD function, page 22 ) Reset Resets all sensor settings to the delivery condition (see section 7.4.1 R...

  • Page 44: Data Storage

    System / Interface / Output of a header for Output Output header format: CSV System / Printer Settings for the integrated prin- ter of the pH 7310 P. For details, see section 10 H 7310P), RINTER ONLY P page 54...

  • Page 45: Resetting The System Settings

    7310 Settings Setting Default settings Measured parameter Resolution pH 0.001 Resolution mV Asymmetry 0 mV Slope -59.2 mV Man. temperature 25 °C One point calibration Stability control Temperature unit °C The sensor settings are reset under the Reset menu item in the menu for cali- bration and measurement settings.

  • Page 46: Data Storage

    Data storage pH 7310 Data storage You can transmit measured values (datasets) to the data storage:  Manual storage (see section 8.1 M , page 46) ANUAL STORAGE  Automatic storage at intervals (see section 8.2 A UTOMATIC STORAGE AT...

  • Page 47: Automatic Storage At Intervals

    7310 Data storage You have the following options:  To erase the entire storage, confirm Yes.  To cancel the storage process and switch to the measured value display, confirm No. Then you can e.g. transmit the stored data to a PC (see section 8.3.1 E...
  • Page 48 Data storage pH 7310 Settings You can configure the automatic storage function with the following settings: Menu item Possible set- Description ting ID number 1 ... 10000 ID number for the dataset series. Interval 1 s, 5 s, 10 s, Storage interval.

  • Page 49: Measurement Data Storage

    7310 Data storage automatic storage of measurement data (such as the display). By pressing any key the energy saving mode is switched off again. Terminating the Proceed as follows to switch off the automatic storage function before the automatic storage...
  • Page 50 24.8 °C AR +++ 01.07.2011 Back USB output 08:00 Representation of a 30.06.2011 09:56:20 dataset inoLab pH 7310 Ser. no. 08502113 (USB output) ID number 2 6.012 24.8 °C, AR, S: +++ ________________________________________ 30.06.2011 10:56:20 inoLab pH 7310 Ser. no. 08502113 ID number 2 6.012 24.8 °C, AR, S: +++...

  • Page 51: Erasing The Measurement Data Storage

    AR indicator.  Calibration evaluation: +++, ++, +, -, or no evaluation 8.3.4 Storage locations The pH 7310 meter has two measurement data storages. The measured values recorded either manually or automatic are stored separately in indi- vidual measurement data storages.

  • Page 52: Transmitting Data (Usb Interface)

    Transmitting data (USB interface) pH 7310 Transmitting data (USB interface) Options for data transmission Via the USB interface you can transmit data to a PC. The following table shows which data are transmitted to the interface in which way: Data...

  • Page 53: Connecting A Pc

    7310 Transmitting data (USB interface) Connecting a PC Connect the pH 7310 to the PC via the USB interface. NOTE When connecting an earthed PC/printer, measurements cannot be performed in earthed media as the values would be incorrect. The USB interface is not galvanically isolated.

  • Page 54: Printer (Only Ph 7310P)

    4 Lid of the paper compartment 10.1 Commissioning / switching the printer on or off Switching on the Connect the power pack to the pH 7310 P. printer The LED lights up green. The printer is ready for operation. If the printer was switched off (LED flashing): Switch on the printer with <OFF>.

  • Page 55: Operation / Printing

    7310 Printer (only pH 7310P) 10.2 Operation / printing Data are only output to the printer if the following conditions are met  Data are transmitted manually or automatically (see section 9.1 O PTIONS , page 52) FOR DATA TRANSMISSION ...

  • Page 56: What To Do If

    Printer (only pH 7310P) pH 7310 Use original WTW rolls of paper only. You will find information on this in the WTW catalog L ABORATORY or on the Internet. IELD NFORMATION The thermal paper will remain legible for at least 7 years if stored appropriately.

  • Page 57: Maintenance, Cleaning, Disposal

    7310 Maintenance, cleaning, disposal Maintenance, cleaning, disposal 11.1 Maintenance 11.1.1 General maintenance activities The only maintenance activity required is replacing the batteries. See the relevant operating manuals of the electrodes for instruc- tions on maintenance. 11.1.2 Replacing the batteries You can operate the meter either with normal batteries or with rechargeable batteries (Ni-MH).

  • Page 58: Cleaning

    Maintenance, cleaning, disposal pH 7310 Close the battery compartment (1). The date (day) flashes on the display. Set the date and time (see section 4.4.6 E XAMPLE ON NAVIGATION , page 20) ETTING THE DATE AND TIME Dispose of used batteries according to the local regulations of your country.

  • Page 59: What To Do If

    7310 What to do if... What to do if... 12.1 pH/ORP More information and instructions on cleaning and exchange of sensors are given in the documentation of your sensor. Error message The measured value is outside the measuring range.
  • Page 60 What to do if... pH 7310 No stable measured Cause Remedy value pH electrode: – Junction contaminated – Clean junction – Membrane contaminated – Clean membrane Test sample: – pH value not stable – Measure with air excluded if necessary –...

  • Page 61: General Information

    7310 What to do if... 12.2 General information Sensor symbol Cause Remedy flashes – Calibration interval expired – Recalibrate the measuring system Cause Remedy – Batteries almost empty – Replace the batteries (see Display section 11.1 M AINTENANCE page 57)

  • Page 62: Technical Data

    Technical data pH 7310 Technical data 13.1 Measuring ranges, resolution, accuracy Measuring ranges, Parameter Measuring range Resolution resolution - 2.0 ... + 20.0 - 2.00 ... + 20.00 0.01 - 2.000 ... + 19.999 0.001 U [mV] - 1200.0 ... + 1200.0 - 2500 ...

  • Page 63: General Data

    7310 Technical data 13.2 General data Dimensions pH 7310: Approx. 240 x 190 x 80 mm pH 7310 P: Approx. 290 x 190 x 80 mm Weight pH 7310: Approx. 0.8 kg pH 7310 P: Approx. 1.0 kg Mechanical structure...
  • Page 64 Technical data pH 7310 Guidelines EC directive 2004/108/EC and norms used EN 61326-1 EN 61000-3-2 EN 61000-3-3 FCC Class A Meter safety EC directive 2006/95/EC EN 61010-1 IP protection class EN 60529 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 65: Firmware Update

     a free USB interface (virtual COM port) on the PC  the driver for the USB interface (on the enclosed CD-ROM)  the USB cable (included in the scope of delivery of the pH 7310). Install the downloaded firmware update on a PC.
  • Page 66 Firmware update pH 7310 ba75929e02 10/2011...

  • Page 67: Glossary

    7310 Glossary Glossary pH/ORP Asymmetry see zero point Electromotive force of The electromotive force U of the combination electrode is the measur- an electrode able electromotive force of an electrode in a solution. It equals the sum of all the galvanic voltages of the combination electrode. Its dependency on the pH results in the electrode function, which is char- acterized by the parameters, slope and zero point.
  • Page 68 Glossary pH 7310 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).

  • Page 69: Index

    7310 Index Index Measuring ORP voltage ....35 Automatic switch-off ....16 pH .
  • Page 70 Index pH 7310 ba75929e02 10/2011...
  • Page 72 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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