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Xylem SI Analytics Lab 955 Operating Manual

Conductivity meter
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OPERATING MANUAL
ba77144e02 12/2017
Lab 955
CONDUCTIVITY METER

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Summary of Contents for Xylem SI Analytics Lab 955

  • Page 1 OPERATING MANUAL ba77144e02 12/2017 Lab 955 CONDUCTIVITY METER...
  • Page 2 Lab 955 For the most recent version of the manual, please visit www.si-analytics.com. Copyright © 2017 Xylem Analytics Germany GmbH Printed in Germany. ba77144e02 12/2017...

  • Page 3: Table Of Contents

    Lab 955 Contents Lab 955 - Contents Overview ....... . . 7 Lab 955 meter .
  • Page 4 Contents Lab 955 4.1.3 Status information ....... . . 14 4.1.4 Socket field .
  • Page 5 Lab 955 Contents Maintenance, cleaning, disposal ... . . 30 Maintenance......... . 30 8.1.1 General maintenance activities .
  • Page 6 Contents Lab 955 ba77144e02 12/2017...

  • Page 7: Overview

    Lab 955 Overview Overview Lab 955 meter The Lab 955 compact digital precision meter enables you to perform conduc- tivity measurements quickly and reliably. The Lab 955 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. 1 Keypad 2 Display 3 Socket field...

  • Page 8: Safety

    Safety Lab 955 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

    Lab 955 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

    Commissioning Lab 955 Commissioning Scope of delivery • Lab 955 meter • 4 batteries 1.5 V Mignon type AA • Power pack • Stand • Stand holder • Short instructions • Detailed operating manual (4 languages) • CD-ROM with detailed operating manual Power supply The Lab 955 is supplied with power in the following ways: •...

  • Page 11: Connecting The Power Pack

    Lab 955 Commissioning Open the battery compartment (2) on the underside of the meter. Insert four batteries in the battery compartment. CAUTION Make sure that the poles of the batteries are positioned correctly. The ± signs on the batteries must correspond to the ± signs in the battery compartment.

  • Page 12: Mounting The Stand

    Commissioning Lab 955 3.3.3 Mounting the stand The stand base can be mounted at the right side of the meter. ba77144e02 12/2017...

  • Page 13: Operation

    Lab 955 Operation Operation General operating principles This section contains basic information on the operation of the Lab 955. 4.1.1 Keypad In this operating manual, keys are indicated by brackets <..> . The key symbol (e.g. <MENU/OK>) generally indicates a short keystroke (under 2 sec) in this operating manual.

  • Page 14: Display

    Operation Lab 955 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 Status information Display Meaning...

  • Page 15: Socket Field

    Lab 955 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. S/cm C °...

  • Page 16: Navigation

    Operation Lab 955 Navigation 4.4.1 Operating modes The meter has the following operating modes: Operating mode Description Measuring The measurement data of the connected sensor are shown in the measured value display Calibration The course of a calibration with calibration informa- tion, functions and settings is displayed Setting A setting is displayed.

  • Page 17: Conductivity

    Lab 955 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. The conductivity measuring screen is displayed.

  • Page 18: Measuring The Temperature

    Conductivity Lab 955 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. Stability criteria (AutoRead ) Measured Time inter-...

  • Page 19: Calibration

    Lab 955 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 Lab 955 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 <MENU/OK>. The measured value is checked for stability (stability control). The [AR] status display flashes.

  • Page 21: Setting The Cell Constant Manually

    Lab 955 Conductivity Confirm the selection of (Use Cell) with <MENU/OK> or <CAL_>. The cell constant of the last calibration is displayed. 1/cm If necessary, select the suitable cell constant with <CAL>. Use <MENU/OK> to finish the calibration. The selected calibrated cell constant is used. 5.2.5 Setting the cell constant manually This method can be used when the cell constant of the measuring cell is known...

  • Page 22: Calibration Data

    Conductivity Lab 955 Confirm the selection of (Use Cell) with <MENU/OK> 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 • Range 0.090 ...
  • Page 23 Lab 955 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 Lab 955 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 <MODE_>. The first setting is displayed. If necessary, indicate the required setting with <ENTER>.

  • Page 25: Cleaning Interval

    Lab 955 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. The flashing calibration evaluation reminds you to clean and calibrate the measuring cell regularly (see section 5.2.3 D ETERMINING THE CELL CONSTANT...

  • Page 26: Setting The Tds Factor

    Settings Lab 955 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

    Lab 955 Settings Sensor-independent settings 6.2.1 Changing the sensor-independent settings Open the menu for the sensor-independent settings with <MENU/OK_>. The first setting is displayed. To change the current setting, press <><>. Confirm the setting with <ENTER>. The settings are finished. The meter switches to the measuring mode.

  • Page 28: Reset

    Reset Lab 955 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. Ini.C is displayed.
  • Page 29 Lab 955 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 Lab 955 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

    Lab 955 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... Lab 955 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

    Lab 955 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 <MENU/OK> and <On/Off> key simultaneously 9.2.3 Displaying the software version (meter) Cause Remedy •...

  • Page 34: Technical Data

    Technical data Lab 955 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 [mS/cm] 20.0 ...

  • Page 35: Cell Constants

    Lab 955 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 Values Adjustable 20 °C (Tref20)

  • Page 36: General Data

    Technical data Lab 955 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 Dimensions Approx. 230 x 190 x 80 mm Weight Approx.
  • Page 37 Lab 955 Technical data Service inter- This interface can be used for service purposes only. face Applicable EMC: directives and • EC directive 2004/108/EC standards • EN 61326-1 • EN 61000-3-2 • EN 61000-3-3 • FCC Class A Instrument safety: •...

  • Page 38: Glossary

    Glossary Lab 955 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. It is a measured value of the ability of a substance to con- duct an electric current.

  • Page 39: General Information

    Lab 955 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 Lab 955 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- tion perature behavior of a test sample, a sensor or part of a sensor.

  • Page 41: Index

    Lab 955 Index Index AR ....... 14 Using the calibrated cell constant ..20 Automatic switch-off function .
  • Page 42 Index Lab 955 ba77144e02 12/2017...
  • Page 44 Xylem also provides a leading portfolio of smart metering, network technologies and advanced analytics solutions for water, electric and gas utilities. In more than 150 countries, we have strong, long-standing relationships with customers who know us for our powerful combination of leading product brands and applications expertise with a strong focus on developing comprehensive, sustainable solutions.

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