wtw Cond 7110 Operating Manual
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wtw Cond 7110 Operating Manual

Conductivity meter
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Operating manual
Cond 7110
Conductivity meter
ba75927e03
04/2012

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Summary of Contents for wtw Cond 7110

  • Page 1 Operating manual Cond 7110 Conductivity meter ba75927e03 04/2012...
  • Page 2 Cond 7110 © Weilheim 2012, WTW GmbH Copyright Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim. Printed in Germany. ba75927e03 04/2012...

  • Page 3: Table Of Contents

    Cond 7110 meter........
  • Page 4 Contents Cond 7110 4.1.3 Status information ....... . . 14 4.1.4...
  • Page 5 Cond 7110 Contents Maintenance, cleaning, disposal ... . . 30 Maintenance......... . 30 8.1.1...
  • Page 6 Contents Cond 7110 ba75927e03 04/2012...

  • Page 7: Overview

    2 Display 3 Socket field Sensors A measuring system ready to measure consists of the Cond 7110 meter and a suitable sensor. Suitable sensors are conductivity measuring cells. Information on available sensors is given on the Internet and in the WTW catalog, "Laboratory and field instrumentation".

  • Page 8: Safety

    Safety Cond 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

    Cond 7110 Safety Safe operation 2.2.1 Authorized use This meter is authorized exclusively for conductivity measurements in the labo- ratory. Only the operation and running of the meter according to the instructions and technical specifications given in this operating manual is authorized (see section 10 T , page 34).

  • Page 10: Commissioning

    • Detailed operating manual (4 languages) • CD-ROM with detailed operating manual Power supply The Cond 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 10 T ECHNICAL DATA page 34). Connect the plug of the power pack to the socket for the power pack on the Cond 7110. Connect the original power pack to an easily accessible power outlet. ba75927e03 04/2012...

  • Page 12: Mounting The Stand

    Commissioning Cond 7110 3.3.3 Mounting the stand The stand base can be mounted at the right side of the meter. ba75927e03 04/2012...

  • Page 13: Operation

    Cond 7110 Operation Operation General operating principles This section contains basic information on the operation of the Cond 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 Cond 7110 4.1.2 Display S/cm µ 1/cm Time C ° °F Tref20 Tref25 LoBat ARng 1 Status information 2 Measured value (with unit) 3 Measured parameter 4 Sensor symbol (calibration evaluation, cleaning interval) 5 Measured temperature (with unit) 4.1.3...

  • Page 15: Socket Field

    Cond 7110 Operation 4.1.4 Socket field 1 Conductivity measuring cell 2 Power pack 3 Service interface Switching on the meter Switch on the meter with <On/Off>. The meter performs a self-test. Connect the sensor. The meter is ready to measure.

  • Page 16: Navigation

    Operation Cond 7110 Navigation 4.4.1 Operating modes The meter has the following operating modes: Operating mode Description The measurement data of the connected sensor are Measuring shown in the measured value display The course of a calibration with calibration informa-...

  • Page 17: Conductivity

    Cond 7110 Conductivity Conductivity Measuring 5.1.1 Measuring the conductivity To ensure the high measurement accuracy of the measuring sys- tem, measure with a current calibration or the correctly set cell constant (see section 5.2 C , page 19). ALIBRATION Connect a conductivity measuring cell to the measuring instrument.

  • Page 18: Measuring The Temperature

    Conductivity Cond 7110 The stability control function (AutoRead) continually checks the stability of the measured values in the monitored time interval. The stability has a consider- able impact on the reproducibility of measured values. The [AR] display indi- cator flashes until a stable value is measured.

  • Page 19: Calibration

    Cond 7110 Conductivity Calibration 5.2.1 Why calibrate? Aging slightly changes the cell constant, e. g. due to 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.

  • Page 20: Using The Last Calibrated Cell Constant

    Conductivity Cond 7110 1/cm Immerse the measuring cell in the control standard solution (0.01 mol/l KCI). When measuring without temperature sensor: Enter the temperature of the standard with <><>. Start the measurement with <ENTER>. The measured value is checked for stability (stability control).

  • Page 21: Setting The Cell Constant Manually

    Cond 7110 Conductivity Confirm the selection of (Use Cell) with <ENTER> or <CAL__>. The cell constant of the last calibration is displayed. 1/cm If necessary, select the suitable cell constant with <CAL>. Use <ENTER> to finish the calibration. The selected calibrated cell constant is used.

  • Page 22: Calibration Data

    Conductivity Cond 7110 Confirm the selection of (Use Cell) with <ENTER> or <CAL__>. The cell constant that was set last is displayed. 1/cm Select a cell constant in a suitable range with <CAL>. • Range 0.250 ... 2.500 cm-1 •...
  • Page 23 Cond 7110 Conductivity 1/cm Calibration evaluation (conductivity) After calibration, the meter automatically evaluates the current status of the calibration. The calibration evaluation is displayed as a sensor symbol. Display Cell constant [cm Within the range 0.450 ... 0.500 cm 0.800 ... 0.880 cm Outside the range 0.450 ...

  • Page 24: Settings

    Settings Cond 7110 Settings The meter has separate setting routines for the measurement settings and system settings. Measurement settings (conductivity) 6.1.1 Changing the settings for conductivity measurements Open the setting menu in the measured value display with <M__>. The first setting is displayed.

  • Page 25: Cleaning Interval

    Cond 7110 Settings 6.1.2 Cleaning interval The cleaning interval is set with the measurement settings (see section 6.1 ), page 24). EASUREMENT SETTINGS CONDUCTIVITY The calibration evaluation (sensor symbol) flashes when a valid calibration is available for a measuring cell and the set cleaning interval has expired.

  • Page 26: Setting The Tds Factor

    Settings Cond 7110 The reference temperature is set in the menu for the parameter conductivity (see section 6.1 M EASUREMENT SETTINGS CONDUCTIV ), page 24). You can select one of the following temperature compensation methods: • Nonlinear temperature compensation (nLF) according to EN 27 888 •...

  • Page 27: Sensor-Independent Settings

    Cond 7110 Settings Sensor-independent settings 6.2.1 Changing the sensor-independent settings Open the menu for the sensor-independent settings with <ENTER__>. The first setting is displayed. To change the current setting, press <><>. Confirm the setting with <ENTER>. The settings are finished.

  • Page 28: Reset

    Reset Cond 7110 Reset You can erase the calibration values and reset (initialize) the measurement and system settings. Erasing the calibration values This function serves to erase the last determined cell constant. Press <On/Off__> to open the menu to erase the calibration data.
  • Page 29 Cond 7110 Reset The following settings are reset to the delivery condition (default): • Measurement settings • System settings • Calibration data The measuring system is possibly not calibrated after a reset. Before measuring, make sure the meter uses the cell con- stant suitable for the measuring cell.

  • Page 30: Maintenance, Cleaning, Disposal

    Maintenance, cleaning, disposal Cond 7110 Maintenance, cleaning, disposal Maintenance 8.1.1 General maintenance activities The only maintenance activity required is replacing the batteries. See the relevant operating manuals of the sensors for instructions on maintenance. 8.1.2 Replacing the batteries You can operate the meter either with normal batteries or with rechargeable batteries (Ni-MH).

  • Page 31: Cleaning

    Cond 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 32: What To Do If

    What to do if... Cond 7110 What to do if... Conductivity More information and instructions on cleaning and exchange of sensors are given in the documentation of your sensor. 9.1.1 Error message E3 Cause Remedy • Measuring cell contaminated • Clean the measuring cell and replace it if necessary •...

  • Page 33: Instrument Does Not React To Keystroke

    Cond 7110 What to do if... 9.2.2 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 9.2.3 Displaying the software version (meter) Cause Remedy •...

  • Page 34: Technical Data

    Technical data Cond 7110 Technical data 10.1 Measuring ranges, resolution, accuracy 10.1.1 Measuring ranges, resolution Parameter Measuring range Resolution 0.001 ϰ 0.000 ... 1.999 [µS/cm] 0.01 0.00 ... 19.99 0.0 ... 199.9 200 ... 1999 2.00 ... 19.99 0.01 ϰ...

  • Page 35: Cell Constants

    Cond 7110 Technical data 10.1.2 Cell constants Cell constant Values Can be calibrated in the 0.800 ... 0.880 cm ranges 0.450 ... 0.500 cm Adjustable 0.250 ... 2.500 cm 0.090 ... 0.110 cm 0.010 cm (permanent) 10.1.3 Reference temperature Reference temperature...

  • Page 36: General Data

    Technical data Cond 7110 The measuring ranges and accuracy values specified here apply exclusively to the meter. The accuracy of the measuring cells and calibration solutions has to be taken into account additionally. 10.2 General data Approx. 240 x 190 x 80 mm Dimensions Approx.
  • Page 37 Cond 7110 Technical data This interface can be used for service purposes only. Service inter- face Applicable EMC: • EC directive 2004/108/EC directives and standards • EN 61326-1 • EN 61000-3-2 • EN 61000-3-3 • FCC Class A Instrument safety: •...

  • Page 38: Glossary

    Glossary Cond 7110 Glossary 11.1 Conductivity Specialist term Description Cell constant, Characteristic quantity of a conductivity measuring cell, depending on the geometry. Conductivity Short form of the expression, specific electrical conductiv- ity. It corresponds to the reciprocal value of the resistivity.

  • Page 39: General Information

    Cond 7110 Glossary 11.2 General information Specialist term Description Adjusting To manipulate a measuring system so that the rele- vant 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.
  • Page 40 Glossary Cond 7110 Specialist term Description Standard solution The standard solution is a solution where the mea- sured value is known by definition. It is used to cali- brate a measuring system. Temperature func- Name of a mathematical function expressing the tem-...

  • Page 41: Index

    Cond 7110 Index Index AR ....... 14 Using the calibrated cell constant ..20 Automatic switch-off function .
  • Page 42 Index Cond 7110 ba75927e03 04/2012...
  • Page 44 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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