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ba75925e02 12/2011

pH 7110

Operating manual

pH meter

Summary of content (52 pages)

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Operating manual pH 7110 pH meter ba75925e02 12/2011
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pH 7110 Contents pH 7110 - Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 pH 7110 meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents pH 7110 4.1.3 4.1.4 Status information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 Switching on the meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.3 Switching off the meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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pH 7110 Contents 7.3 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7.3.1 Changing the sensor-independent settings . . . . . . . . . . . . . . 32 7.3.2 Energy saving (battery operation) . . . . . . . . . . . . . . . . . . . . . 32 8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8.1 Resetting the calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8.2 Resetting the measurement and system settings . . .
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Contents pH 7110 11.1.3 Accuracy (± 1 digit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 11.2 General data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 12 Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 12.1 pH/ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 12.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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pH 7110 1 Overview Overview 1.1 pH 7110 meter The pH 7110 compact digital precision meter enables you to perform pH and ORP measurements quickly and reliably. The pH 7110 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. 3 2 1 1 Keypad 2 Display 3 Socket field 1.2 Sensors A measuring system ready to measure consists of the pH 7110 meter and a suitable sensor.
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Safety 2 pH 7110 Safety 2.1 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 information you need. Important safety instructions are highlighted in this operating manual.
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pH 7110 Safety 2.2 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 TECHNICAL DATA, page 42). Any other use is considered unauthorized. 2.2.
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Commissioning 3 pH 7110 Commissioning 3.1 • • • • • • • • 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 manual 3.2 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) 3.
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pH 7110 Commissioning 1. Open the battery compartment (2) on the underside of the meter. 2. 2 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. 3. Close the battery compartment tightly. When the batteries are nearly empty, the [LoBat] status indicator is displayed. 3.3.
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Commissioning pH 7110 3.3.3 Mounting the stand The stand base can be mounted at the right side of the meter.
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pH 7110 4 Operation Operation 4.1 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. ) generally indicates a short keystroke (under 2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indicated by the underscore behind the key symbol (e.g. ).
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Operation pH 7110 4.1.2 Display 3 UpH 2 1 8 8 8 8°F mV/pH % 8 8 8 8 °C Time 1 4 LoBat AutoCal DIN 5 TP CalError AutoCal TEC ConCal AR 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 14 Status information Display Meaning [AutoCal TEC] [AutoCal DIN] Calibration with automatic buffer recognition, e.g.
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pH 7110 Operation 4.1.4 Socket field 1 2 3 4 5 1 pH electrode 2 Reference electrode 3 Temperature sensor 4 Power pack 5 Service interface 4.2 Switching on the meter 1. 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. pH 6992 248 TP °C AR 4.3 1. ba75925e02 12/2011 Switching off the meter Switch off the meter with . The meter is switched off.
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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). 4.4 Navigation 4.4.
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pH 7110 Operation When the last setting is confirmed, the setting menu is automatically quit. • Press to exit the setting mode.
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pH value 5 pH 7110 pH value 5.1 Measuring 5.1.1 Measuring the pH value To ensure the high measurement accuracy of the measuring system, always measure with A current calibration (see section 5.2 CALIBRATION, page 19). 1. Connect the pH electrode to the meter. 2. When measuring without temperature sensor: Temper the test sample or measure the current temperature. 3. If necessary, select the measured parameter (pH) with . 4. Immerse the pH electrode in the test sample.
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pH 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. The actual duration is mostly longer. 5.1.2 Measuring the temperature For reproducible pH measurements, it is essential to measure the temperature of the test sample.
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pH value pH 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 • After connecting another combination electrode 5.2.3 Automatic calibration (AutoCal) Use any one to three buffer solutions of a buffer set (technical buffers or DIN buffers) in ascending or descending order.
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pH 7110 pH value 8. Wait for the measurement with stability control to be completed or terminate the stability control with . The calibration display for the next buffer appears. Ct2 or Cd2 is displayed. pH CT2 2 4 8 °C TP AutoCal TEC 9. If necessary, finish the calibration procedure as a single-point calibration with . The calibration record is displayed. For single-point calibration, the instrument uses the Nernst slope (-59.
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pH value pH 7110 pH CT3 2 4 8 °C TP AutoCal TEC 15. If necessary, finish the calibration procedure as a two-point calibration with . The calibration record is displayed. or Continue calibration using the next buffer with . Continuing with three-point calibration 16. 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 of the buffer with <><>. 19.
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pH 7110 pH value 3. If necessary, press to select the buffer set ([ConCal]). ASY is displayed. ASY 248 TP °C ConCal 4. Thoroughly rinse the pH electrode with deionized water. 5. Immerse the pH electrode in the first buffer solution (pH 7.0 ± 0.5 for two-point calibration). 6. When measuring without temperature sensor: Enter the temperature of the buffer with <><>. 7. Start the measurement with . The pH value of the buffer solution is displayed.
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pH value pH 7110 14. When measuring without temperature sensor: Enter the temperature of the 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 .
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pH 7110 pH value 02 mV ASy ConCal While the zero point is being displayed (ASY) you can switch over the unit of the zero point with <><>. 2. Press to display further calibration data. The value for the slope (SLO) is displayed. - 592 mV/pH SL O ConCal While the slope is being displayed (SLO) you can switch over the unit of the slope with <><>. Calibration evaluation (pH) After calibrating, the meter automatically evaluates the calibration.
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pH value pH 7110 Display [CalError] Zero point [mV] Slope [mV/pH] -30 ... <-25 or ->+25 ... +30 -62.0 ... <-61.0 or >-56.0 ... -50.0 <-30 or >+30 <-62.0 or > -50.0 (see section 10 WHAT TO DO IF...
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pH 7110 6 ORP ORP 6.1 Measuring 6.1.1 Measuring the ORP 1. 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.
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ORP pH 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. Which type of temperature measurement is active is indicated by the temperature display and the [TP] status indicator: Temperature sensor Resolution of the temp. display Temp. measurement yes 0.
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pH 7110 7 Settings Settings The meter has separate setting routines for the measurement settings and system settings. 7.1 Measurement settings (pH) 7.1.1 Changing the settings for pH measurements 1. 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.
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Settings pH 7110 Displayed (Confirm with ) Possible setting (Change with <><>) Description pH rES 0.000 0.00 0.0 Resolution of pH display Unit °C °F Temperature unit 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. The temperature dependence of the pH values is taken into account during the calibration.
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pH 7110 Settings 7.1.3 Calibration interval The calibration interval is set with the measurement settings (see section 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.
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Settings pH 7110 Displayed (Confirm with ) Possible setting (Change with <><>) Description U rES 0.0 0 Resolution of the voltage display Unit °C °F Temperature unit 7.3 Sensor-independent settings 7.3.1 Changing the sensor-independent settings 1. 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.
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pH 7110 Settings The switch-off interval is set with the system settings (see section 7.3 SENSOR-INDEPENDENT SETTINGS, page 32).
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Reset 8 pH 7110 Reset You can erase the calibration values and reset (initialize) the measurement and system settings. 8.1 Resetting the calibration values 1. Press to open the menu for the reset of the calibration data. InIt.C is displayed. 2. Use <><> to display no or YES. 3. • YES: Reset the calibration values • no: Retain the calibration values. Confirm with . The menu is finished. The meter switches to the measuring mode. The calibration values are reset to default.
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pH 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 ) pH (nominal buffer value) Unit of the value for the slope (SLO ) mV/pH Unit of the value for the zero point (ASY ) mV Measured value resolution (pH rES) 0.000 Measured value resolution (U rES) 0.
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Maintenance, cleaning, disposal 9 pH 7110 Maintenance, cleaning, disposal 9.1 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). In order to charge the batteries, an external charging device is required. 1.
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pH 7110 Maintenance, cleaning, disposal 4. 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. Batteries are marked with the crossed-out waste container symbol.
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What to do if... 10 pH 7110 What to do if... 10.1 pH More information and instructions on cleaning and exchange of sensors are given in the documentation of your sensor. 10.1.
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pH 7110 What to do if... Cause • The used buffer solutions do not agree with the set buffer set Remedy • Set different buffer set or • Use different buffer solutions • Buffer solutions too old • Use only once. Note the shelf life • Buffer solutions depleted 10.1.3 • Change solutions Error message OFL, UFL The measured value is outside the measuring range. The measured value is obviously incorrect.
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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. The measured value is obviously incorrect.
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pH 7110 What to do if... 10.3.3 Instrument does not react to keystroke Cause Operating condition undefined or EMC load unallowed 10.3.4 E. g., a question by the service department 12/2011 • Processor reset: Press the and key simultaneously Displaying the software version (meter) Cause ba75925e02 Remedy Remedy • Switch on the meter. During the display test, display the software version with .
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Technical data 11 pH 7110 Technical data 11.1 Measuring ranges, resolution, accuracy 11.1.1 Measuring ranges, resolution Parameter Resolution pH - 2.0 ... + 20.0 - 2.00 ... + 20.00 - 2.000 ... + 19.999 0.1 0.01 0.001 U [mV] - 1200.0 ... + 1200.0 - 2000 ... + 2000 0.1 1 T [°C] - 5.0 ... + 105.0 0.1 T [°F] + 23.0 ... + 221.0 0.1 11.1.2 Manual temperature input Parameter 42 Measuring range Range Increment Tmanual [°C] - 25 ... + 130 1 Tmanual [°F] -13 ...
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pH 7110 Technical data 11.1.3 Accuracy (± 1 digit) Parameter Temperature of the test sample Accuracy pH / range * - 2.0 ... + 20.0 - 2.00 ... + 20.00 - 2.000 ... + 19.999 ± 0.1 ± 0.01 ± 0.005 + 15 °C ... + 35 °C + 15 °C ... + 35 °C + 15 °C ... + 35 °C U [mV] / range - 2000 ... + 2000 -1200.0 ... +1200.0 ±1 ± 0.3 + 15 °C ... + 35 °C + 15 °C ... + 35 °C T [°C] / temperature sensor • NTC 30 • PT 1000 ± 0.1 ± 0.1 * when measuring in a range of ± 2 pH around a calibration point 11.
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Technical data pH 7110 Power supply Batteries: 4 x 1.5 V alkali-manganese batteries, type AA Operating time: Approx. 2500 h (operating hours) Rechargeable batteries: 4 x 1.2 V NiMH rechargeable batteries, type AA (no charging function) Power pack: Ktec KSAC 0900110W1UV-1 Input: 100 ... 240 V ~ / 50 ... 60 Hz / 270 mA Output: 9 V = / 1.1 A Connection max. Overvoltage category II Primary plugs included in the scope of delivery: Euro, US, UK and Australian.
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pH 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.
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Glossary 12 pH 7110 Glossary 12.1 pH/ORP Specialist term 46 Description Asymmetry see zero point Diaphragm The junction is a porous body in the housing wall of reference electrodes or electrolyte bridges. It arranges the electrical contact between two solutions and makes the electrolyte exchange more difficult. The expression, junction, is also used for ground or junction-less transitions.
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pH 7110 Glossary 12.2 General information Specialist term ba75925e02 12/2011 Description Adjusting To manipulate a measuring system so that the relevant 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. AutoRange Name of the automatic selection of the measuring range. Calibration Comparing the value from a measuring system (e. g.
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Glossary 48 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 function Name of a mathematical function expressing the temperature behavior of a test sample, a sensor or part of a sensor. Test sample Designation of the test sample ready to be measured. Normally, a test sample is made by processing the original sample.
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pH 7110 13 Index Index Stability control . . . . . . . . . . . . . . . . . . 18, 27 A AR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 AutoCal . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Automatic switch-off function . . . . . . . . . . . 32 AutoRead . . . . . . . . . . . . . . . . . . . . . . . 18, 27 Z Zero point (pH electrode) . . . . . . . . . . . 19, 24 Zero point, pH . . . . . . . . . . . . . . . . . . . . . . 25 B Battery compartment . . . . . . . . . . . . . .
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Index 50 pH 7110 ba75925e02 12/2011
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