pH 7110 - Fagerberg

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pH 7110 - Fagerberg

pH 7110Copyright© Weilheim 2011, WTW GmbHReproduction in whole - or even in part - is prohibited without the expresswritten permission of WTW GmbH, Weilheim.Printed in Germany.2 ba75925e01 07/2011


pH 7110ContentspH 7110 - Contents1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.1 pH 7110 meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.2 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1.1 Safety information in the operating manual. . . . . . . . . . . . . . . . 82.1.2 Safety signs on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1.3 Further documents providing safety information . . . . . . . . . . . . 82.2 Safe operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.2.2 Requirements for safe operation. . . . . . . . . . . . . . . . . . . . . . . . 92.2.3 Unauthorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . 103.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.3.1 Inserting the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.3.2 Connecting the power pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 113.3.3 Mounting the stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1 General operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14ba75925e01 07/2011 3


Contents pH 711011.1.3 Accuracy (± 1 digit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4311.2 General data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4312 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4612.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4612.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4713 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 496 ba75925e01 07/2011


pH 7110Overview1 Overview1.1 pH 7110 meterThe pH 7110 compact digital precision meter enables you to perform pH andORP measurements quickly and reliably.The pH 7110 provides the maximum degree of operating comfort, reliability andmeasuring certainty for all applications.3211 Keypad2 Display3 Socket field1.2 SensorsA measuring system ready to measure consists of the pH 7110 meter and asuitable sensor.The pH 7110 can be operated with the following sensors:• pH electrode• ORP electrodeInformation on available sensors is given on the Internet and in theWTW catalog, "Laboratory and field instrumentation".ba75925e01 07/2011 7


Safety pH 71102 Safety2.1 Safety information2.1.1 Safety information in the operating manualThis operating manual provides important information on the safe operation ofthe meter. Read this operating manual thoroughly and make yourself familiarwith the meter before putting it into operation or working with it. The operatingmanual must be kept in the vicinity of the meter so you can always find the informationyou need.Important safety instructions are highlighted in this operating manual. They areindicated by the warning symbol (triangle) in the left column. The signal word(e.g. "CAUTION") indicates the level of danger:WARNINGindicates a possibly dangerous situation that can lead toserious (irreversible) injury or death if the safety instruction isnot followed.CAUTIONindicates a possibly dangerous situation that can lead toslight (reversible) injury if the safety instruction is notfollowed.NOTEindicates a possibly dangerous situation where goods might be damagedif the actions mentioned are not taken.2.1.2 Safety signs on the meterNote all labels, information signs and safety symbols on the meter and in thebattery compartment. A warning symbol (triangle) without text refers to safetyinformation in this operating manual.2.1.3 Further documents providing safety informationThe following documents provide additional information, which you shouldobserve for your safety when working with the measuring system:• Operating manuals of sensors and other accessories• Safety datasheets of calibration or maintenance accessories (such as buffersolutions, electrolyte solutions, etc.)8 ba75925e01 07/2011


pH 7110Safety2.2 Safe operation2.2.1 Authorized useThis meter is authorized exclusively for pH and ORP measurements in thelaboratory.Only the operation and running of the meter according to the instructions andtechnical specifications given in this operating manual is authorized (seesection 11 TECHNICAL DATA, page 42).Any other use is considered unauthorized.2.2.2 Requirements for safe operationNote the following points for safe operation:• The meter may only be operated according to the authorized use specifiedabove.• The meter may only be supplied with power by the energy sourcesmentioned in this operating manual.• The meter may only be operated under the environmental conditionsmentioned in this operating manual.• The meter may only be opened if this is explicitly described in this operatingmanual (example: Inserting the batteries).2.2.3 Unauthorized useThe meter must not be put into operation if:• it is visibly damaged (e.g. after being transported)• it was stored under adverse conditions for a lengthy period of time (storingconditions, see section 11 TECHNICAL DATA, page 42).ba75925e01 07/2011 9


Commissioning pH 71103 Commissioning3.1 Scope of delivery• pH 7110 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 manual3.2 Power supplyThe 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)3.3 Initial commissioningPerform the following activities:• Insert the supplied batteries• Connect the power pack (mains operation)• Mount the stand• Switch on the meter(see section 4.2 SWITCHING ON THE METER, page 15)3.3.1 Inserting the batteriesYou can operate the meter either with normal batteries or withrechargeable batteries (Ni-MH).In order to charge the batteries, an external charging device isrequired.10 ba75925e01 07/2011


pH 7110Commissioning1. Open the battery compartment (2) on the underside of the meter.22. Insert four batteries in the battery compartment.CAUTIONMake sure that the poles of the batteries are positionedcorrectly.The ± signs on the batteries must correspond to the ± signsin the battery compartment.3. Close the battery compartment tightly.When the batteries are nearly empty, the [LoBat] status indicator isdisplayed.3.3.2 Connecting the power packCAUTIONThe line voltage at the operating site must lie within the inputvoltage range of the original power pack (see section 11 TECH-NICAL DATA, page 42).CAUTIONUse original power packs only (see section 11 TECHNICAL DATA,page 42).1. Connect the plug of the power pack to the socket for the power pack onthe pH 7110.2. Connect the original power pack to an easily accessible power outlet.ba75925e01 07/2011 11


Commissioning pH 71103.3.3 Mounting the standThe stand base can be mounted at the right side of the meter.2112 ba75925e01 07/2011


pH 7110Operation4 Operation4.1 General operating principlesThis section contains basic information on the operation of the pH 7110.4.1.1 KeypadIn this operating manual, keys are indicated by brackets .The key symbol (e.g. ) generally indicates a short keystroke (under2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indicatedby the underscore behind the key symbol (e.g. ).Key Symbol MeaningSwitches the meter on or offResets calibration dataSelects the measured parameterOpens the measurement settingsCalls up the calibration procedureDisplays the calibration dataIncrements, decrements valuesIncrements, decrements values continuouslyConfirms entriesOpens the menu for system settingsba75925e01 07/2011 13


Operation pH 71104.1.2 Display321UpH1 8 8 8 8Time8888mV/pH%°F°CAutoCal DINCalErrorLoBatAutoCal TEC ConCal ARTP451 Status information2 Measured value (with unit)3 Measured parameter4 Sensor symbol (calibration evaluation, calibration interval)5 Measured temperature (with unit)4.1.3 Status informationDisplay[AutoCal TEC][AutoCal DIN][ConCal][CalError][AR][TP][Time][LoBat]MeaningCalibration with automatic buffer recognition, e.g. with thebuffer set: Technical buffersCalibration with any buffersAn error occurred during calibrationStability control (AutoRead) is activeTemperature measurement activeSetting of calibration intervalBatteries are almost empty14 ba75925e01 07/2011


pH 7110Operation4.1.4 Socket field1 2 3 4 51 pH electrode2 Reference electrode3 Temperature sensor4 Power pack5 Service interface4.2 Switching on the meter1. Switch on the meter with .The meter performs a self-test.The meter switches to the measuring mode (measured value display).2. Connect the sensor.The meter is ready to measure.pH6 9 9 22 4 8°CTPAR4.3 Switching off the meter1. Switch off the meter with .The meter is switched off.ba75925e01 07/2011 15


Operation pH 7110When the meter is powered by the batteries, it switches itself offautomatically after an adjustable interval to save the batteries (seesection Automatic switch-off function, page 32).4.4 Navigation4.4.1 Operating modesThe meter has the following operating modes:Operating modeMeasuringCalibrationTransmitting dataSettingDescriptionThe measurement data of the connected sensor areshown in the measured value displayThe course of a calibration with calibration information,functions and settings is displayedThe meter transmits measuring data and calibrationrecords to a USB-B interface automatically or manually.A setting is displayed.4.4.2 Measuring mode (measured value display)The following functions are available in the measuring mode (measured valuedisplay):• Change the display in the selected measuring window (e. g. pH mV) bypressing • To open the measurement settings, press (long pressure).• To open the system settings, press (long pressure).4.4.3 Setting modeThe following functions are available in the setting mode:• To change the current setting, press .• Confirm the setting with .The next setting is displayed.The settings are stored.16 ba75925e01 07/2011


pH 7110OperationWhen the last setting is confirmed, the setting menu is automaticallyquit.• Press to exit the setting mode.ba75925e01 07/2011 17


pH 7110pH valueStability criteria (AutoRead )Measured parameter Time interval Stability in the time intervalpH value 15 seconds Δ pH: Better than 0.02Temperature 15 seconds Δ T (° C): Better than 0.3The minimum duration until a measured value is assessed as stable is themonitored time interval. The actual duration is mostly longer.5.1.2 Measuring the temperatureFor reproducible pH measurements, it is essential to measure the temperatureof the test sample.You have the following options to measure the temperature:• Automatic measurement of the temperature with the temperature sensor(NTC30 or Pt1000) integrated in the sensor.• Measurement with an external temperature sensor.• Manual determination and input of the temperature.The measuring instrument recognizes whether a suitable sensor is connectedand automatically switches on the temperature measurement.Which type of temperature measurement is active is indicated by the temperaturedisplay and the [TP] status indicator:TemperaturesensorResolutionof the temp.displayStatusindicatorTemp. measurementyes 0.1 °C [TP] Automatic with temperaturesensor- 1 °C - ManualIf you wish to measure (or calibrate) without temperature sensor, proceed asfollows:1. Measure the current temperature of the test sample.2. Set the temperature value with .5.2 Calibration5.2.1 Why calibrate?When a pH electrode is operated, its zero point (asymmetry) and slope changewith the course of time. As a result, an inexact measured value is displayed.ba75925e01 07/2011 19


pH value pH 7110Calibration determines and stores the current values of the zero point andslope. 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• After connecting another combination electrode5.2.3 Automatic calibration (AutoCal)Use any one to three buffer solutions of a buffer set (technical buffers or DINbuffers) in ascending or descending order.Below, calibration with Technical buffers (TEC) is described. When other buffersets are used, other nominal buffer values are displayed. Apart from that, theprocedure is identical.1. Start the calibration with .The calibration display for the first buffer appears.2. When measuring without temperature sensor: Temper the buffer ormeasure the current temperature.3. If necessary, press to select the buffer set used ([AutoCal TEC],[AutoCal DIN]).Ct1 or Cd1 is displayed.pHC T 12 4 8 °CTPAutoCal TEC4. Thoroughly rinse the pH electrode with deionized water.5. Immerse the pH electrode in the first buffer solution.6. When measuring without temperature sensor: Enter the temperature ofthe buffer with .7. Start the measurement with .The measured value is checked for stability (stability control).The [AR] status display flashes.The electrode voltage (mV) or the nominal value of the buffer is displayed(setting: see section 7.1.1 CHANGING THE SETTINGS FOR PH MEASURE-MENTS, page 29).20 ba75925e01 07/2011


pH 7110pH value8. Wait for the measurement with stability control to be completed or terminatethe stability control with .The calibration display for the next buffer appears.Ct2 or Cd2 is displayed.pHC T 22 4 8 °CTPAutoCal TEC9. If necessary, finish the calibration procedure as a single-point calibrationwith .The calibration record is displayed.For single-point calibration, the instrument uses the Nernstslope (-59.2 mV/pH at 25 °C) and determines the zero pointof the pH electrode.orContinue calibration using the next buffer with .Continuing with two-point calibration10. Thoroughly rinse the pH electrode with deionized water.11. Immerse the pH electrode in the second buffer solution.12. When measuring without temperature sensor: Enter the temperature ofthe buffer with .13. Start the measurement with .The measured value is checked for stability (stability control).The [AR] status display flashes.The electrode voltage (mV) or the nominal value of the buffer is displayed(setting: see section 7.1.1 CHANGING THE SETTINGS FOR PH MEASURE-MENTS, page 29).14. Wait for the measurement with stability control to be completed or terminatethe stability control and take over the calibration value with.The calibration display for the next buffer appears.Ct3 or Cd3 is displayed.ba75925e01 07/2011 21


pH value pH 7110pHC T 32 4 8 °CTPAutoCal TEC15. If necessary, finish the calibration procedure as a two-point calibrationwith .The calibration record is displayed.orContinue calibration using the next buffer with .Continuing with three-point calibration16. Thoroughly rinse the pH electrode with deionized water.17. Immerse the pH electrode in the third buffer solution.18. When measuring without temperature sensor: Enter the temperature ofthe buffer with .19. Start the measurement with .The measured value is checked for stability (stability control).The [AR] status display flashes.The electrode voltage (mV) or the nominal value of the buffer (setting: seesection 7.1.1 CHANGING THE SETTINGS FOR PH MEASUREMENTS, page 29).20. Wait for the measurement with stability control to be completed or terminatethe stability control and take over the calibration value with.The calibration record is displayed.5.2.4 Manual calibration (ConCal)Use any buffer solution for the single-point calibration. The calibration will bethe more accurate the nearer the pH value of the buffer solution is to that of thetest sample.Use the following buffer solutions for two-point calibration:• one buffer solution with pH 7.0 ± 0.5• any other buffer solution1. Start the calibration with .The calibration display for the first buffer appears.2. When measuring without temperature sensor: Temper the buffer ormeasure the current temperature.22 ba75925e01 07/2011


pH 7110pH value3. If necessary, press to select the buffer set ([ConCal]).ASY is displayed.A S Y2 4 8 °CTPConCal4. Thoroughly rinse the pH electrode with deionized water.5. Immerse the pH electrode in the first buffer solution (pH 7.0 ± 0.5 fortwo-point calibration).6. When measuring without temperature sensor: Enter the temperature ofthe buffer with .7. Start the measurement with .The pH value of the buffer solution is displayed.The measured value is checked for stability (stability control).The [AR] status display flashes.8. Wait for the measurement with stability control to be completed.9. Set the nominal pH value of the buffer solution with .10. Accept the calibration value with .SLO is displayed.s L O2 4 8 °CTPConCal11. If necessary, finish the calibration procedure as a single-point calibrationwith .The calibration record is displayed.orContinue calibration using the next buffer with .Continuing with two-point calibration12. Thoroughly rinse the pH electrode with deionized water.13. Immerse the pH electrode in the second buffer solution.ba75925e01 07/2011 23


pH value pH 711014. When measuring without temperature sensor: Enter the temperature ofthe buffer with .15. Start the measurement with .The pH value of the buffer solution is displayed.The measured value is checked for stability (stability control).The [AR] status display flashes.16. Wait for the measurement with stability control to be completed.17. Set the nominal pH value of the buffer solution with .18. Accept the calibration value with .The calibration record is displayed.5.2.5 Calibration pointsDepending on the number of buffer solutions used, the meter determines thefollowing values and calculates the calibration line:CalibrationValues determinedDisplayed calibration data1-point Asy • Zero point = Asy• Slope = Nernst slope(-59.2 mV/pH at 25 °C)2-point3-pointAsySloAsySlo• Zero point = Asy• Slope = SloThe calibration line goes through both calibrationpoints.• Zero point = Asy• Slope = SloThe calibration line is calculated by linearregression.You can display the slope in the units, mV/pH or % (see section5.2.6 CALIBRATION DATA, page 24).5.2.6 Calibration dataDisplaying the calibration data1. Display the calibration data in the measured value display with .The value for the asymmetry (ASY) is displayed.24 ba75925e01 07/2011


pH 7110pH value0 2mVA S yConCalWhile the zero point is being displayed (ASY) you can switch over the unitof the zero point with .2. Press to display further calibration data.The value for the slope (SLO) is displayed.- 52S L O9 mV/pHConCalWhile the slope is being displayed (SLO) you can switch over the unit ofthe slope with .Calibration evaluation (pH)After calibrating, the meter automatically evaluates the calibration. The zeropoint and slope are evaluated separately. The worse evaluation of both is takeninto account. The evaluation appears on the display.Display Zero point [mV] Slope [mV/pH]-15 ... +15 -60.5 ... -58.0-20 ... +15 ... +20-25 ... +20 ... +25>-58.0 ... -57.0-61.0 ... -57.0 ... -56.0ba75925e01 07/2011 25


pH value pH 7110Display Zero point [mV] Slope [mV/pH][CalError] +30-30 ... +25 ... +30-62.0 ... -56.0 ... -50.0 -50.0(see section 10 WHAT TO DO IF..., page 38)26 ba75925e01 07/2011


pH 7110ORP6 ORP6.1 Measuring6.1.1 Measuring the ORP1. Connect the ORP electrode to the meter.2. If necessary, call up the measured parameter U with .3. Immerse the ORP electrode in the test sample.The measured value is checked for stability (stability control).The [AR] status display flashes.4. Wait for a stable measured value.The [AR] display indicator no longer flashes.U48 62 1 33mV°CTPARStability control (AutoRead )During the measuring procedure, the stability control function is automaticallyactivated.The stability control function (AutoRead) continually checks the stability of themeasured values in the monitored time interval. The stability has a considerableimpact on the reproducibility of measured values. The [AR] display indicatorflashes until a stable value is measured.Stability criteria (AutoRead )Measured parameter Time interval Stability in the time intervalORP 15 seconds Δ mV: Better than 0.36.1.2 Measuring the temperatureThe temperature measurement is absolutely essential for a reproducible ORPmeasurement.ba75925e01 07/2011 27


ORP pH 7110You 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 connectedand automatically switches on the temperature measurement.Which type of temperature measurement is active is indicated by the temperaturedisplay and the [TP] status indicator:TemperaturesensorResolution of thetemp. displayTemp. measurementyes 0.1 Automatic with temperature sensor- 1 °C ManualIf the measurement is made without a temperature sensor, proceed as follows:1. Measure the current temperature of the test sample.2. Set the temperature value with .6.2 CalibrationORP electrodes are not calibrated. You can, however, check ORP electrodesusing a test solution.28 ba75925e01 07/2011


pH 7110Settings7 SettingsThe meter has separate setting routines for the measurement settings andsystem settings.7.1 Measurement settings (pH)7.1.1 Changing the settings for pH measurements1. Open the setting menu in the measured value display with .The first setting is displayed.2. If necessary, indicate the required setting with .3. To change the current setting, press .4. Confirm the setting with .The next setting is displayed.5. Change or confirm the other settings.When the last setting is confirmed, the setting menu is automaticallyquit.orQuit the setting menu with .The settings are stored.Settings for pH measurementsDefault settings are printed in bold.The settings appear in the following order:Displayed(Confirm with)pH bUFFpH SLOpH ASYPossible setting(Change with)pHUmV/pH%mVpHDescriptionDisplay during calibrationNominal buffer value (pH) orElectrode voltage (U)Unit of the value for the slopeUnit of the value for the zero pointba75925e01 07/2011 29


Settings pH 7110Displayed(Confirm with)Possible setting(Change with)DescriptionpH rES 0.0000.000.0Unit °C°FResolution of pH displayTemperature unitInt.C 1 ... 7... 999 d Calibration interval7.1.2 Buffer sets for calibrationYou can use the buffer sets quoted in the table for an automatic calibration. ThepH values are valid for the specified temperature values. The temperaturedependence of the pH values is taken into account during the calibration.The buffer set is selected during calibration (see section 5.2.3AUTOMATIC CALIBRATION (AUTOCAL), page 20).No. Buffer set pH values at1 TECWTW Technical buffers2 NIST/DINDIN buffers according to DIN 19266and NIST Traceable Buffers2.0004.0107.00010.0111.6794.0066.8659.18012.45425 °C25 °C3 ConCal 1-pointcal.:• Any2-pointcal.:• 7.0 ± 0.5• Anyany,adjustable30 ba75925e01 07/2011


pH 7110Settings7.1.3 Calibration intervalThe calibration interval is set with the measurement settings (seesection 7.1 MEASUREMENT SETTINGS (PH), page 29).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.To ensure the high measuring accuracy of the measuring system,calibrate after the calibration interval has expired.7.2 Measurement settings (ORP)7.2.1 Changing the settings for ORP measurements1. Open the setting menu in the measured value display with .The first setting is displayed.2. Indicate the required setting with .3. To change the current setting, press .4. Confirm the setting with .The next setting is displayed.5. Change or confirm the other settings.When the last setting is confirmed, the setting menu is automaticallyquit.orQuit the setting menu with .The settings are stored.List of the settings for ORP measurementsThe settings for ORP measurements are in the same setting routine as thesettings for pH measurements.Default settings are printed in bold.ba75925e01 07/2011 31


Settings pH 7110Displayed(Confirm with)Possible setting(Change with)DescriptionU rES 0.00Unit °C°FResolution of the voltage displayTemperature unit7.3 Sensor-independent settings7.3.1 Changing the sensor-independent settings1. Open the menu for the sensor-independent settings with .The first setting is displayed.2. To change the current setting, press .3. Confirm the setting with .The settings are finished.The meter switches to the measuring mode.List of sensor-independent settingsDefault settings are printed in bold.Displayed(Confirm with)t.OffPossible setting(Change with)10, 20, 30, 40, 50 min,1, 2, 3, 4, 5, 10, 15, 20, 24 hDescriptionSwitch-off interval (see sectionAutomatic switch-offfunction, page 32)7.3.2 Energy saving (battery operation)Automatic switch-off functionThe meter has an automatic switch-off function to avoid unnecessary powerconsumption during battery operation.The energy saving feature switches off the meter during battery operation if nokey is pressed during the adjusted interval.The automatic switch-off function is not active when the power pack isconnected.32 ba75925e01 07/2011


pH 7110SettingsThe switch-off interval is set with the system settings (see section 7.3SENSOR-INDEPENDENT SETTINGS, page 32).ba75925e01 07/2011 33


Reset pH 71108 ResetYou can erase the calibration values and reset (initialize) the measurement andsystem settings.8.1 Resetting the calibration values1. Press to open the menu for the reset of the calibration data.InIt.C is displayed.2. Use to display no or YES.• YES: Reset the calibration values• no: Retain the calibration values.3. Confirm with .The menu is finished. The meter switches to the measuring mode.The calibration values are reset to default. All other metersettings are retained.Recalibrate after performing a reset.Calibration values to be resetCalibration valueDefault settingsZero point (ASY ) 0 mV (pH 7.000)Slope (SLO ) -59.16 mV/pH (100 %)8.2 Resetting the measurement and system settings1. Switch on the meter with .The display test appears briefly on the display.2. During the display test, press to open the menu for the reset of themeter settings.Init is displayed.3. Use to display no or YES.• YES: Reset the meter settings.• no: Retain the meter settings.4. Confirm with .The settings are reset. The menu is finished.The meter switches to the measuring mode.34 ba75925e01 07/2011


pH 7110ResetThe following settings are reset to the delivery condition (default):• Measurement settings• System settings• Calibration dataRecalibrate after performing a reset.Measurement and system settings that can be resetMeasurement settingsDisplay during calibration (bUFF )Unit of the value for the slope (SLO )Unit of the value for the zero point(ASY )DefaultpH (nominal buffer value)mV/pHmVMeasured value resolution (pH rES) 0.000Measured value resolution (U rES) 0.0Unit of the measured temperaturevalue (Unit )Calibration interval (Int.C )°C7 dSystem settingsDefaultSwitch-off interval (t.Off )1 hba75925e01 07/2011 35


Maintenance, cleaning, disposal pH 71109 Maintenance, cleaning, disposal9.1 Maintenance9.1.1 General maintenance activitiesThe only maintenance activity required is replacing the batteries.See the relevant operating manuals of the sensors for instructionson maintenance.9.1.2 Replacing the batteriesYou can operate the meter either with normal batteries or withrechargeable batteries (Ni-MH).In order to charge the batteries, an external charging device isrequired.1. Open the battery compartment (2) on the underside of the meter.22. Remove the old batteries.3. Place four batteries (type AA) in the battery compartment.CAUTIONMake sure that the poles of the batteries are positionedcorrectly.The ± signs on the batteries must correspond to the ± signs inthe battery compartment.36 ba75925e01 07/2011


pH 7110Maintenance, cleaning, disposal4. Close the battery compartment tightly.When the batteries are nearly empty, the [LoBat] status indicator isdisplayed.Dispose of used batteries according to the local regulations ofyour country.End users within the European Union are obligated to return usedbatteries (even ecologically compatible ones) to a collection pointset up for recycling purposes.Batteries are marked with the crossed-out waste containersymbol. Therefore, they may not be disposed with the domesticwaste.9.2 CleaningOccasionally wipe the outside of the measuring instrument with a damp,lint-free cloth. Disinfect the housing with isopropanol as required.CAUTIONThe housing is made of synthetic material (ABS). Thus, avoidcontact with acetone or similar detergents that containsolvents. Remove any splashes immediately.9.3 PackingThis meter is sent out in a protective transport packing.We recommend: Keep the packing material. The original packing protects themeter against damage during transport.9.4 DisposalAt the end of its operational lifetime, the meter must be returned to thedisposal or return system statutory in your country. If you have any questions,please contact your supplier.ba75925e01 07/2011 37


What to do if... pH 711010 What to do if...10.1 pHMore information and instructions on cleaning and exchange ofsensors are given in the documentation of your sensor.10.1.1 No stable measured valueCause• Junction of the electrode contaminated• Glass membrane of the electrodecontaminatedRemedy• Clean the junction• Clean the glass membraneCause• pH value of the test sample notstable• Temperature of the test samplenot stableRemedy• Measure with air excluded ifnecessary• Adjust temperature if necessary10.1.2 Error message CalErrorCause• The values determined for zeropoint and slope of the electrodeare outside the allowed limits.• RecalibrateRemedy• Junction contaminated • Clean the junction• pH electrode broken • Replace the pH electrode38 ba75925e01 07/2011


pH 7110What to do if...Cause• The used buffer solutions do notagree with the set buffer setRemedy• Set different buffer setor• Use different buffer solutions• Buffer solutions too old • Use only once.Note the shelf life• Buffer solutions depleted • Change solutions10.1.3 Error message OFL, UFLThe measured value is outside the measuring range.The measured value is obviously incorrect.CauseRemedy• Cable broken • Replace the electrode• Gel electrolyte dried out • Replace the electrode• Air bubble in front of the junction • Remove the air bubble• Air in the junction • Extract air or moisten the junction10.2 ORPMore information and instructions on cleaning and exchange ofsensors are given in the documentation of your sensor.10.2.1 No stable measured valueCauseRemedy• Junction contaminated • Clean the junction• Pt-ORP electrode contaminated • Clean the Pt-ORP electrodeba75925e01 07/2011 39


What to do if... pH 7110CauseRemedy• ORP value not stable • Measure with air excluded ifnecessary• Temperature not stable • Adjust temperature if necessary10.2.2 Error message OFL, UFLThe measured value is outside the measuring range of the meter.The measured value is obviously incorrect.CauseRemedy• Cable broken • Replace the electrode• Gel electrolyte dried out • Replace the electrode• Air bubble in front of the junction • Remove the air bubble• Air in the junction • Extract air or moisten the junction10.3 General information10.3.1 Symbol for calibration evaluation flashesCauseCalibration interval expiredRemedyRecalibrate the measuring system10.3.2 [LoBat] displayCauseBatteries almost emptyRemedyReplace the batteries (see section3.3.1 INSERTING THE BATTERIES,page 10)40 ba75925e01 07/2011


pH 7110What to do if...10.3.3 Instrument does not react to keystrokeCauseOperating condition undefined orEMC load unallowedRemedy• Processor reset:Press the and key simultaneously10.3.4 Displaying the software version (meter)CauseE. g., a question by the servicedepartmentRemedy• Switch on the meter.During the display test, displaythe software version with.ba75925e01 07/2011 41


Technical data pH 711011 Technical data11.1 Measuring ranges, resolution, accuracy11.1.1 Measuring ranges, resolutionParameter Measuring range ResolutionpH - 2.0 ... + 20.0- 2.00 ... + 20.00- 2.000 ... + 19.999U [mV] - 1200.0 ... + 1200.0- 2000 ... + 20000.10.010.0010.11T [°C] - 5.0 ... + 105.0 0.1T [°F] + 23.0 ... + 221.0 0.111.1.2 Manual temperature inputParameter Range IncrementT manual [°C] - 25 ... + 130 1T manual [°F] -13 ... + 266 142 ba75925e01 07/2011


pH 7110Technical data11.1.3 Accuracy (± 1 digit)ParameterpH / range *- 2.0 ... + 20.0- 2.00 ... + 20.00- 2.000 ... + 19.999U [mV] / range- 2000 ... + 2000-1200.0 ... +1200.0T [°C] / temperature sensor• NTC 30• PT 1000Accuracy± 0.1± 0.01± 0.005± 1± 0.3± 0.1± 0.1Temperature of thetest sample+ 15 °C ... + 35 °C+ 15 °C ... + 35 °C+ 15 °C ... + 35 °C+ 15 °C ... + 35 °C+ 15 °C ... + 35 °C* when measuring in a range of ± 2 pH around a calibration point11.2 General dataDimensionsWeightMechanicalstructureElectricalsafetyTest certificatesApprox. 240 x 190 x 80 mmApprox. 1.0 kgType of protection IP 43Protective class IIICE, cETLusAmbientconditionsStoring: - 25 °C ... + 65 °COperation: -10 °C ... + 55 °CAllowable relative humidityYearly mean: < 75 %30 days/year: 95 %Other days: 85 %ba75925e01 07/2011 43


Technical data pH 7110Power supplyBatteries: 4 x 1.5 V alkali-manganese batteries, typeAAOperating time: Approx. 2500 h (operating hours)Rechargeable batteries: 4 x 1.2 V NiMH rechargeablebatteries, type AA(no charging function)Power pack: TAIYIIE KSAC 0900110W10V-1Input: 100 ... 240 V ~ / 50 ... 60 Hz / 270 mAOutput: 9 V = / 1.1 AConnection max. Overvoltage category IIPrimary plugs included in the scope of delivery: Euro,US, UK and Australian.Sensor inputInput resistance: > 5 * 1013 ohmInput current: < 1 * 10 -12 AService interfaceThis interface can be used for service purposes only.Applicabledirectives andstandardsEMC:• EC directive 2004/108/EC• EN 61326-1• EN 61000-3-2• EN 61000-3-3• FCC Class AInstrument safety:• EC directive 2006/95/EC• EN 61010-1• ANSI/UL 61010-1• CAN/CSA-C22.2 No. 61010-1IP type of protection:• EN 6052944 ba75925e01 07/2011


pH 7110Technical dataFCC Class A Equipment StatementNote: This equipment has been tested and found to comply with the limitsfor a Class A digital device, pursuant to Part 15 of the FCC Rules. Theselimits are designed to provide reasonable protection against harmfulinterference when the equipment is operated in a commercialenvironment. This equipment generates, uses, and can radiate radiofrequency energy and, if not installed and used in accordance with theinstruction manual, may cause harmful interference to radiocommunications. Operation of this equipment in a residential area is likelyto cause harmful interference in which case the user will be required tocorrect the interference at his own expense.Changes or modifications not expressly approved by the manufacturercould void the user‘s authority to operate the equipment.ba75925e01 07/2011 45


Glossary pH 711012 Glossary12.1 pH/ORPSpecialisttermDescriptionAsymmetryDiaphragmElectromotiveforce of anelectrodeORPpH valueSlopeZero pointsee zero pointThe junction is a porous body in the housing wall of referenceelectrodes or electrolyte bridges. It arranges theelectrical contact between two solutions and makes theelectrolyte exchange more difficult. The expression, junction,is also used for ground or junction-less transitions.The electromotive force U of the combination electrode isthe measurable electromotive force of an electrode in asolution. It equals the sum of all the galvanic voltages ofthe electrode. Its dependency on the pH results in theelectrode function, which is characterized by the parameters,slope and zero point.The ORP is caused by oxidizing or reducing substancesdissolved in water if these substances become effectiveon an electrode surface (e. g. a gold or platinum surface).The pH value is a measure of the acidic or basic effect ofan aqueous solution. It corresponds to the negativedecadic logarithm of the molal hydrogen ions activitydivided by the unit of the molality. The practical pH value isthe value of a pH measurement.The slope of a linear calibration function.The zero point of a pH combination electrode is the pHvalue at which the electromotive force of the pH combinationelectrode at a specified temperature is zero. Normally,this is at 25 °C.46 ba75925e01 07/2011


pH 7110Glossary12.2 General informationSpecialist termAdjustingAutoRangeDescriptionTo manipulate a measuring system so that the relevantvalue (e. g. the displayed value) differs as little as possiblefrom the correct value or a value that is regardedas correct, or that the difference remains within thetolerance.Name of the automatic selection of the measuringrange.Calibration Comparing the value from a measuring system (e. g.the displayed value) to the correct value or a value thatis regarded as correct. Often, this expression is alsoused when the measuring system is adjusted at thesame time (see adjusting).Measured parameterMeasured valueMolalityPotentiometryResetResolutionStability control(AutoRead )The measured parameter is the physical dimensiondetermined by measuring, e. g. pH, conductivity orD.O. concentration.The measured value is the special value of a measuredparameter to be determined. It is given as a combinationof the numerical value and unit (e. g. 3 m; 0.5 s;5.2 A; 373.15 K).Molality is the quantity (in Mol) of a dissolved substancein 1000 g solvent.Name of a measuring technique. The signal (dependingon the measured parameter) of the electrode is theelectrical potential. The electrical current remains constant.Restoring the original condition of all settings of a measuringsystem.Smallest difference between two measured values thatcan be displayed by a meter.Function to control the measured value stability.ba75925e01 07/2011 47


Glossary pH 7110Specialist termStandard solutionTemperaturefunctionTest sampleDescriptionThe standard solution is a solution where the measuredvalue is known by definition. It is used to calibrate ameasuring system.Name of a mathematical function expressing the temperaturebehavior of a test sample, a sensor or part of asensor.Designation of the test sample ready to be measured.Normally, a test sample is made by processing the originalsample. The test sample and original sample areidentical if the test sample was not processed.48 ba75925e01 07/2011


pH 7110Index13 IndexAAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14AutoCal . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Automatic switch-off function . . . . . . . . . . . 32AutoRead . . . . . . . . . . . . . . . . . . . . . . . 18, 27Stability control . . . . . . . . . . . . . . . . . . 18, 27ZZero point (pH electrode) . . . . . . . . . . . 19, 24Zero point, pH . . . . . . . . . . . . . . . . . . . . . . 25BBattery compartment . . . . . . . . . . . . . . 11, 36Buffer sets (pH) . . . . . . . . . . . . . . . . . . . . . 30CCalibration evaluation (pH) . . . . . . . . . . . . 25Calibration interval (pH) . . . . . . . . . . . . . . . 31ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22DDefault (calibration values) . . . . . . . . . . . . 34Default (measurement settings) . . . . . . . . . 35Default (system settings) . . . . . . . . . . . . . . 35Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14IInitial commissioning . . . . . . . . . . . . . . . . . 10Initialize . . . . . . . . . . . . . . . . . . . . . . . . . . . 34KKeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13MMeasured value display . . . . . . . . . . . . . . . 16Measuring (ORP) . . . . . . . . . . . . . . . . . . . . 27Measuring (pH) . . . . . . . . . . . . . . . . . . . . . 18RReset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Resolution setting . . . . . . . . . . . . . . . . . . . 32SSafe operation . . . . . . . . . . . . . . . . . . . . . . . 9Scope of delivery . . . . . . . . . . . . . . . . . . . . 10Single-point calibration (pH, AutoCal) . . . . 21Slope (pH electrode) . . . . . . . . . . . . . . 19, 24Slope, pH . . . . . . . . . . . . . . . . . . . . . . . . . . 25Socket field . . . . . . . . . . . . . . . . . . . . . . . . 15ba75925e01 07/2011 49


Index pH 711050 ba75925e01 07/2011


Wissenschaftlich-Technische Werkstätten GmbHDr.-Karl-Slevogt-Straße 1D-82362 WeilheimGermanyTel: +49 (0) 881 183-0+49 (0) 881 183-100Fax: +49 (0) 881 183-420E-Mail: Info@WTW.comInternet: http://www.WTW.com

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