wtw pH 7110 Operating Manual
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wtw pH 7110 Operating Manual

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Operating manual
pH 7110
pH meter
ba75925e01
07/2011

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  • Page 1 Operating manual pH 7110 pH meter ba75925e01 07/2011...
  • Page 2 7110 © Copyright Weilheim 2011, WTW GmbH Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim. Printed in Germany. ba75925e01 07/2011...

  • Page 3: Table Of Contents

    7110 meter........
  • Page 4 Contents pH 7110 4.1.3 Status information ....... . . 14 4.1.4...
  • Page 5 7110 Contents Sensor-independent settings ......32 7.3.1 Changing the sensor-independent settings ....32 7.3.2...
  • Page 6 Contents pH 7110 11.1.3 Accuracy (± 1 digit) ....... . 43 11.2 General data.

  • Page 7: Overview

    1 Keypad 2 Display 3 Socket field Sensors A measuring system ready to measure consists of the pH 7110 meter and a suitable sensor. The pH 7110 can be operated with the following sensors: • pH electrode • ORP electrode Information on available sensors is given on the Internet and in the WTW catalog, "Laboratory and field instrumentation".

  • Page 8: Safety

    Safety pH 7110 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

    7110 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 11 T , page 42).

  • Page 10: Commissioning

    • Detailed operating manual (4 languages) • CD-ROM with detailed operating manual Power supply The pH 7110 is supplied with power in the following ways: • Mains operation with the supplied power pack. • Battery operation (4 x alkaline manganese batteries, type AA)

  • Page 11: Connecting The Power Pack

    Use original power packs only (see section 11 T ECHNICAL DATA page 42). Connect the plug of the power pack to the socket for the power pack on the pH 7110. Connect the original power pack to an easily accessible power outlet. ba75925e01 07/2011...

  • Page 12: Mounting The Stand

    Commissioning pH 7110 3.3.3 Mounting the stand The stand base can be mounted at the right side of the meter. ba75925e01 07/2011...

  • Page 13: Operation

    7110 Operation Operation General operating principles This section contains basic information on the operation of the pH 7110. 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.

  • Page 14: Display

    Operation pH 7110 4.1.2 Display mV/pH °F Time ° C AutoCal DIN CalError LoBat AutoCal TEC ConCal 1 Status information 2 Measured value (with unit) 3 Measured parameter 4 Sensor symbol (calibration evaluation, calibration interval) 5 Measured temperature (with unit) 4.1.3...

  • Page 15: Socket Field

    7110 Operation 4.1.4 Socket field 1 pH electrode 2 Reference electrode 3 Temperature sensor 4 Power pack 5 Service interface Switching on the meter Switch on the meter with <On/Off>. The meter performs a self-test. The meter switches to the measuring mode (measured value display).

  • Page 16: Navigation

    Operation pH 7110 When the meter is powered by the batteries, it switches itself off automatically after an adjustable interval to save the batteries (see section Automatic switch-off function, page 32). Navigation 4.4.1 Operating modes The meter has the following operating modes:...
  • Page 17 7110 Operation When the last setting is confirmed, the setting menu is auto- matically quit. • Press <M> to exit the setting mode. ba75925e01 07/2011...

  • Page 18: Ph Value

    7110 pH value Measuring 5.1.1 Measuring the pH value To ensure the high measurement accuracy of the measuring sys- tem, always measure with A current calibration (see section 5.2 , page 19). ALIBRATION Connect the pH electrode to the meter.

  • Page 19: Measuring The Temperature

    7110 pH value Stability criteria (AutoRead ) Measured parameter Time interval Stability in the time interval pH value 15 seconds Δ pH: Better than 0.02 Temperature 15 seconds Δ T (° C): Better than 0.3 The minimum duration until a measured value is assessed as stable is the monitored time interval.

  • Page 20: When To Calibrate

    7110 Calibration determines and stores the current values of the zero point and slope. Thus, you should calibrate at regular intervals. 5.2.2 When to calibrate? • When the calibration interval has expired • Routinely within the framework of the company quality assurance •...
  • Page 21 7110 pH value Wait for the measurement with stability control to be completed or termi- nate the stability control with <ENTER>. The calibration display for the next buffer appears. Ct2 or Cd2 is displayed. ° C AutoCal TEC If necessary, finish the calibration procedure as a single-point calibration with <M>.

  • Page 22: Manual Calibration (Concal)

    7110 ° C AutoCal TEC If necessary, finish the calibration procedure as a two-point calibration with <M>. The calibration record is displayed. Continue calibration using the next buffer with <ENTER>. Continuing with three-point calibration Thoroughly rinse the pH electrode with deionized water.
  • Page 23 7110 pH value If necessary, press <CAL> to select the buffer set ([ConCal]). ASY is displayed. °C ConCal Thoroughly rinse the pH electrode with deionized water. Immerse the pH electrode in the first buffer solution (pH 7.0 ± 0.5 for two-point calibration).

  • Page 24: Calibration Points

    7110 When measuring without temperature sensor: Enter the temperature of the buffer with <><>. Start the measurement with <ENTER> . The pH value of the buffer solution is displayed. The measured value is checked for stability (stability control).
  • Page 25 7110 pH value ConCal While the zero point is being displayed (ASY) you can switch over the unit of the zero point with <><>. Press <ENTER> to display further calibration data. The value for the slope (SLO) is displayed.
  • Page 26 7110 Display Zero point [mV] Slope [mV/pH] -30 ... <-25 -62.0 ... <-61.0 ->+25 ... +30 >-56.0 ... -50.0 [CalError] <-30 <-62.0 >+30 > -50.0 (see section 10 W ..., page 38) HAT TO DO IF ba75925e01...

  • Page 27: Orp

    7110 Measuring 6.1.1 Measuring the ORP Connect the ORP electrode to the meter. If necessary, call up the measured parameter U with <M>. Immerse the ORP electrode in the test sample. The measured value is checked for stability (stability control).

  • Page 28: Calibration

    7110 You have the following options to measure the temperature: • Measurement with an external temperature sensor. • Manual determination and input of the temperature. The measuring instrument recognizes whether a suitable sensor is connected and automatically switches on the temperature measurement.

  • Page 29: Settings

    7110 Settings Settings The meter has separate setting routines for the measurement settings and system settings. Measurement settings (pH) 7.1.1 Changing the settings for pH measurements Open the setting menu in the measured value display with <M__>. The first setting is displayed.

  • Page 30: Buffer Sets For Calibration

    Settings pH 7110 Displayed Possible setting (Confirm with (Change with <ENTER>) <><>) Description pH rES 0.000 Resolution of pH display 0.00 Unit °C Temperature unit °F Int.C 1 ... 7... 999 d Calibration interval 7.1.2 Buffer sets for calibration You can use the buffer sets quoted in the table for an automatic calibration. The pH values are valid for the specified temperature values.

  • Page 31: Calibration Interval

    7110 Settings 7.1.3 Calibration interval The calibration interval is set with the measurement settings (see section 7.1 M H), page 29). EASUREMENT SETTINGS The calibration evaluation is displayed as a sensor symbol. The sensor symbol flashes after the adjusted calibration interval has expired.

  • Page 32: Sensor-Independent Settings

    Settings pH 7110 Displayed Possible setting (Confirm with (Change with <ENTER>) <><>) Description U rES Resolution of the voltage display Unit °C Temperature unit °F Sensor-independent settings 7.3.1 Changing the sensor-independent settings Open the menu for the sensor-independent settings with <ENTER__>.
  • Page 33 7110 Settings The switch-off interval is set with the system settings (see section 7.3 , page 32). ENSOR INDEPENDENT SETTINGS ba75925e01 07/2011...

  • Page 34: Reset

    Reset pH 7110 Reset You can erase the calibration values and reset (initialize) the measurement and system settings. Resetting the calibration values Press <On/Off__> to open the menu for the reset of the calibration data. InIt.C is displayed. Use <><> to display no or YES.
  • Page 35 7110 Reset The following settings are reset to the delivery condition (default): • Measurement settings • System settings • Calibration data Recalibrate after performing a reset. Measurement and system settings that can be reset Measurement settings Default Display during calibration (bUFF )

  • Page 36: Maintenance, Cleaning, Disposal

    Maintenance, cleaning, disposal pH 7110 Maintenance, cleaning, disposal Maintenance 9.1.1 General maintenance activities The only maintenance activity required is replacing the batteries. See the relevant operating manuals of the sensors for instructions on maintenance. 9.1.2 Replacing the batteries You can operate the meter either with normal batteries or with rechargeable batteries (Ni-MH).

  • Page 37: Cleaning

    7110 Maintenance, cleaning, disposal Close the battery compartment tightly. When the batteries are nearly empty, the [LoBat] status indicator is displayed. Dispose of used batteries according to the local regulations of your country. End users within the European Union are obligated to return used batteries (even ecologically compatible ones) to a collection point set up for recycling purposes.

  • Page 38: What To Do If

    What to do if... pH 7110 What to do if... 10.1 More information and instructions on cleaning and exchange of sensors are given in the documentation of your sensor. 10.1.1 No stable measured value Cause Remedy • Junction of the electrode contami- •...

  • Page 39: Error Message Ofl, Ufl

    7110 What to do if... Cause Remedy • The used buffer solutions do not • Set different buffer set agree with the set buffer set • Use different buffer solutions • Buffer solutions too old • Use only once.

  • Page 40: Error Message Ofl, Ufl

    What to do if... pH 7110 Cause Remedy • ORP value not stable • Measure with air excluded if necessary • Temperature not stable • Adjust temperature if necessary 10.2.2 Error message OFL, UFL The measured value is outside the measuring range of the meter.

  • Page 41: Instrument Does Not React To Keystroke

    7110 What to do if... 10.3.3 Instrument does not react to keystroke Cause Remedy • Processor reset: Operating condition undefined or EMC load unallowed Press the <ENTER> and <On/Off> key simultaneously 10.3.4 Displaying the software version (meter) Cause Remedy •...

  • Page 42: Technical Data

    Technical data pH 7110 Technical data 11.1 Measuring ranges, resolution, accuracy 11.1.1 Measuring ranges, resolution Parameter Measuring range Resolution - 2.0 ... + 20.0 - 2.00 ... + 20.00 0.01 - 2.000 ... + 19.999 0.001 U [mV] - 1200.0 ... + 1200.0 - 2000 ...

  • Page 43: Accuracy (± 1 Digit)

    7110 Technical data 11.1.3 Accuracy (± 1 digit) Temperature of the Parameter Accuracy test sample pH / range ± 0.1 + 15 °C ... + 35 °C - 2.0 ... + 20.0 ± 0.01 + 15 °C ... + 35 °C - 2.00 ...
  • Page 44 Technical data pH 7110 Power supply Batteries: 4 x 1.5 V alkali-manganese batteries, type Operating time: Approx. 2500 h (operating hours) Rechargeable batteries: 4 x 1.2 V NiMH rechargeable batteries, type AA (no charging function) Power pack: TAIYIIE KSAC 0900110W10V-1 Input: 100 ...
  • Page 45 7110 Technical data 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. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

  • Page 46: Glossary

    Glossary pH 7110 Glossary 12.1 pH/ORP Specialist term Description Asymmetry see zero point Diaphragm The junction is a porous body in the housing wall of refer- ence electrodes or electrolyte bridges. It arranges the electrical contact between two solutions and makes the electrolyte exchange more difficult.

  • Page 47: General Information

    7110 Glossary 12.2 General information Specialist term Description Adjusting To manipulate a measuring system so that the relevant value (e. g. the displayed value) differs as little as pos- sible from the correct value or a value that is regarded as correct, or that the difference remains within the tolerance.
  • Page 48 Glossary pH 7110 Specialist term Description Standard solution The standard solution is a solution where the measured value is known by definition. It is used to calibrate a measuring system. Temperature Name of a mathematical function expressing the tem- function perature behavior of a test sample, a sensor or part of a sensor.

  • Page 49: Index

    7110 Index Index Stability control ....18, 27 AR ....... 14 AutoCal .
  • Page 50 Index pH 7110 ba75925e01 07/2011...
  • Page 52 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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