Xylem SI Analytics Lab 855 Operating Manual
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Xylem SI Analytics Lab 855 Operating Manual

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OPERATING MANUAL
ba77143e02 12/2017
Lab 855
pH METER

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Summary of Contents for Xylem SI Analytics Lab 855

  • Page 1 OPERATING MANUAL ba77143e02 12/2017 Lab 855 pH METER...
  • Page 2 Lab 855 For the most recent version of the manual, please visit www.si-analytics.com. Copyright © 2017 Xylem Analytics Germany GmbH Printed in Germany. ba77143e02 12/2017...

  • Page 3: Table Of Contents

    Lab 855 Contents Lab 855 - Contents Overview ....... . . 7 Lab 855 meter .
  • Page 4 Contents Lab 855 4.1.3 Status information ....... . . 14 4.1.4 Socket field .
  • Page 5 Lab 855 Contents Sensor-independent settings ......31 7.3.1 Changing the sensor-independent settings ....31 7.3.2 Energy saving (battery operation) .
  • Page 6 Contents Lab 855 11.1.3 Accuracy (± 1 digit) ....... . 40 11.2 General data.

  • Page 7: Overview

    Lab 855 Overview Overview Lab 855 meter The Lab 855 compact digital precision meter enables you to perform pH and ORP measurements quickly and reliably. The Lab 855 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 855 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 855 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 40).

  • Page 10: Commissioning

    Commissioning Lab 855 Commissioning Scope of delivery • Lab 855 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 855 is supplied with power in the following ways: •...

  • Page 11: Connecting The Power Pack

    Lab 855 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 855 3.3.3 Mounting the stand The stand base can be mounted at the right side of the meter. ba77143e02 12/2017...

  • Page 13: Operation

    Lab 855 Operation Operation General operating principles This section contains basic information on the operation of the Lab 855. 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 Lab 855 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 Status information Display...

  • Page 15: Socket Field

    Lab 855 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). Connect the sensor.

  • Page 16: Navigation

    Operation Lab 855 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 31). Navigation 4.4.1 Operating modes The meter has the following operating modes: Operating mode Description Measuring...

  • Page 17: Ph Value

    Lab 855 pH value 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 18). ALIBRATION Connect the pH electrode to the meter. When measuring without temperature sensor: Temper the test sample or measure the current temperature.

  • Page 18: Measuring The Temperature

    pH value Lab 855 Stability criteria (AutoRead ) Measured parameter Time interval Stability in the time interval pH value 15 seconds ∆ : Better than 0.01 pH Temperature 15 seconds ∆ : Better than 0.5 °C The minimum duration until a measured value is assessed as stable is the monitored time interval.

  • Page 19: When To Calibrate

    Lab 855 pH value 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 20 pH value Lab 855 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 21: Manual Calibration (Concal)

    Lab 855 pH value ° 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. Immerse the pH electrode in the third buffer solution.
  • Page 22 pH value Lab 855 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 23: Calibration Points

    Lab 855 pH value 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). The [AR] status display flashes.
  • Page 24 pH value Lab 855 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. mV/pH ConCal While the slope is being displayed (SLO) you can switch over the unit of...
  • Page 25 Lab 855 pH value 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 36) HAT TO DO IF ba77143e02 12/2017...

  • Page 26: Orp

    Lab 855 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). The [AR] status display flashes.

  • Page 27: Measuring The Temperature

    Lab 855 6.1.2 Measuring the temperature The temperature measurement is absolutely essential for a reproducible ORP measurement. 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 28: Settings

    Settings Lab 855 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. If necessary, indicate the required setting with <ENTER>.

  • Page 29: Buffer Sets For Calibration

    Lab 855 Settings 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 30: Calibration Interval

    Settings Lab 855 7.1.3 Calibration interval The calibration interval is set with the measurement settings (see section 7.1 M H), page 28). EASUREMENT SETTINGS The calibration evaluation is displayed as a sensor symbol. The sensor symbol flashes after the adjusted calibration interval has expired. It is still possible to measure.

  • Page 31: Sensor-Independent Settings

    Lab 855 Settings 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__>. The first setting is displayed.

  • Page 32: Reset

    Reset Lab 855 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 33 Lab 855 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 ) pH (nominal buffer value) Unit of the value for the slope (SLO ) mV/pH Unit of the value for the zero point...

  • Page 34: Maintenance, Cleaning, Disposal

    Maintenance, cleaning, disposal Lab 855 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 35: Cleaning

    Lab 855 Maintenance, cleaning, disposal 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 36: What To Do If

    What to do if... Lab 855 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 37: Error Message Ofl, Ufl

    Lab 855 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. Note the shelf life •...

  • Page 38: Error Message Ofl, Ufl

    What to do if... Lab 855 10.2.2 Error message OFL, UFL The measured value is outside the measuring range of the meter. The measured value is obviously incorrect. Cause Remedy • Cable broken • Replace the electrode • Gel electrolyte dried out •...

  • Page 39: Displaying The Software Version (Meter)

    Lab 855 What to do if... 10.3.4 Displaying the software version (meter) Cause Remedy • Switch on the meter. E. g., a question by the service department During the display test, display the software version with <ENTER>. ba77143e02 12/2017...

  • Page 40: Technical Data

    Technical data Lab 855 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 41: General Data

    Lab 855 Technical data 11.2 General data Dimensions Approx. 230 x 190 x 80 mm Weight Approx. 1.0 kg Mechanical Type of protection IP 43 structure Electrical safety Protective class III Test certificates Ambient Storing: - 25 °C ... + 65 °C conditions Operation: +5 °C ...
  • Page 42 Technical data Lab 855 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: • EC directive 2006/95/EC • EN 61010-1 IP type of protection: • 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 43: Glossary

    Lab 855 Glossary 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 elec- trical contact between two solutions and makes the electrolyte exchange more difficult.

  • Page 44: General Information

    Glossary Lab 855 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 possi- ble from the correct value or a value that is regarded as correct, or that the difference remains within the tolerance.
  • Page 45 Lab 855 Glossary 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 func- Name of a mathematical function expressing the tem- tion perature behavior of a test sample, a sensor or part of a sensor.
  • Page 46 Glossary Lab 855 ba77143e02 12/2017...

  • Page 47: Index

    Lab 855 Index Index Stability control ....17, 26 AR ....... 14 AutoCal .
  • Page 48 Index Lab 855 ba77143e02 12/2017...
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