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98648-012-08

Operation Manual

Sartorius Basic Meter PB-11

Содержание PB-11

Страница 1: ...98648 012 08 Operation Manual Sartorius Basic Meter PB 11 ...

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Страница 3: ... Maintaining Electrodes 9 Standardizing for pH Measurement 13 Using Setup 15 Standardizing for Millivolt Measurement 18 Understanding pH Theory 19 Temperature Compensation 20 Measuring pH 21 Troubleshooting 23 Meter Specifications 24 Accessories 25 C Declaration of Conformity ...

Страница 4: ...ton Press to select menu item options 5 Measuring icon 6 Temperature 7 Mode 8 Result 9 Prompts 10 Buffer icons 11 Icon standardization calibration of the meter in process 12 Stability icon 13 Standardizing icon 14 Standardization result Front View Display 1 2 3 4 1 68 4 01 6 86 9 18 12 46 S1 S2 S3 3 2 1 C Auto Man Set Clear OK Error 1234567810101213 Sal TDS DO mg L S cm cm ion rel mV pH m µ K M C ...

Страница 5: ...e connector 2 Reference electrode connector used with separate reference electrodes 3 BNC electrode connector 4 Temperature compensation probe connector 5 AC adapter Rear View Connecting to a Power Source 1 2 3 4 1 5 ...

Страница 6: ...o this equipment will void any warranty claims against the manufacturer If liquid gets into the pH meter unplug it from AC power mains supply and have an authorized service technician check the pH meter If you do not plan to use this pH meter for a relatively long period please disconnect it from AC power For safety reasons use this equipment only for the application described in this operation ma...

Страница 7: ...he electrode 2 Before first use of your electrode or whenever the electrode is dry soak overnight in a standard solution or KCI solution 3 Remove the shorting cap on the pH meter connector Install the electrode by plugging the BNC and ATC connectors into the jacks on the rear panel ...

Страница 8: ...e reference electrode into the ref pin 5 Clean the electrode between each measurement with distilled water or deionized water or part of the next solution to be measured 6 Store glass pH electrodes in KCI solution or electrode filling solution Make sure the liquid level of the internal filling solution is always a few centimeters higher than that of the measurement solution Reference Electrode ISE...

Страница 9: ...more often for accurate results This pH meter allows automatic standardization using up to three buffers Press the Standardize button again to delete all the standardization data stored up to that point The pH meter performs automatic temperature compensation 1 Immerse electrode in a buffer solution Stir gently Allow the electrode to reach a stable value 2 Press the Mode button until your digital ...

Страница 10: ...s Standardize The meter recognizes the buffer and flashes a buffer icon When the signal is stable the buffer is entered By pressing ENTER you can also enter the current buffer directly 5 The meter displays the slope of the electrode as 100 0 On entering a second or third buffer the meter performs a diagnostic check on the electrode and displays the slope See step 7 ff Standardize ...

Страница 11: ...r also displays the slope of the electrode 8 Error indicates that your electrode or the buffer is not working properly or a wrong set of buffers has been selected The electrode response must be between 90 and 105 slope See Troubleshooting on page 21 Press Enter to clear the Error then try re entering the buffer as described in step 6 9 To set a third standard place the electrode in the third buffe...

Страница 12: ...urns to Measuring operation Note The meter continually adjusts for temperature Therefore buffers may vary slightly from the nominal values because of temperature 11 Standardize your pH meter using at least two buffers with pH values bracketing the expected pH of your samples Stirring with a magnetic stir bar provides faster electrode response ...

Страница 13: ...ffers you have entered If you are sure you want to clear the buffers press Enter The meter clears all buffers and returns to Measuring 2 Press Setup again to show electrode performance slope and the first and second calibration points The two buffer values will also be displayed 3 Pressing Setup again shows the electrode slope between the second and third buffers if three buffers have been entered...

Страница 14: ...uffers shown on the display or Press Setup again to toggle between the existing sets of buffers 6 Press Enter to select the displayed buffer set that contains the buffer you want to use Press Setup again or press the Mode button at any time to return to Measuring Note You may select buffers from different sets Setup or Enter Setup ...

Страница 15: ...n concentration The ISE senses the ion concentration and responds with a millivolt potential The millivolt readings are then used to determine ion concen trations on the basis of a previously entered calibration curve You will normally use a redox ORP electrode to measure redox potential ORP ORP measurements indicate the oxidizing or reducing capability of a solution You can use ORP values to moni...

Страница 16: ... display indicates mV mode 3 Press Standardize to enter an mV standard and read relative mV 4 When the signal becomes stable or when you press Enter the current absolute mV value offset becomes zero relative millivolts Mode Standardize ...

Страница 17: ...d return to absolute millivolt mode press Setup The meter displays a flashing Clear icon and shows the current relative millivolt offset 6 To clear the previous mV offset press Enter You then return to absolute mV mode Setup Enter ...

Страница 18: ...e rather than say that lemon juice is quite acidic you can say that lemon juice has a pH of 2 4 An exact pH value can be used to control or measure acidity levels for manufacturing processes or for basic research pH values generally range from 0 to14 with a pH of 7 being the neutral point or the value of pure water pH values greater than 7 represent increasing alkalinity whereas pH values below 7 ...

Страница 19: ...urrent temperature For example if the buffer has a nominal pH of 7 00 at a temperature of 25 C the meter will standardize the buffer to 7 02 instead of 7 00 at a temperature of 20 C 2 Electrode slope changes as a function of temperature Theoretically the change of voltage per pH unit is approx 59 16 mV at 25 C However this mV per pH unit changes as a function of temperature The meter compensates f...

Страница 20: ...ectrode is paired with a reference electrode which completes the electrical measuring circuit and provides a stable reference point These two electrodes are joined to create a combination electrode The combination glass electrode is connected to the pH meter which reads the voltage converts it to pH units and displays the result Reference Electrode Porous Junction Diaphragm pH Sensor Temperature s...

Страница 21: ... detects an error in electrode response During standardization the message indicates that the electrode is less than 90 or more than 105 of the correct response The Error message can indicate either a bad electrode or bad buffer s 3 If the meter detects an error in the temperature measurement the display shows C If you do not use a temperature probe the meter uses the standard temperature 25 C ...

Страница 22: ...low when temperature is approx 25 C 5 To test the meter for correct operation install the BNC input shorting cap Press pH mV to select the mV mode and note the mV reading If the meter reads 0 0 3 mV it is measuring correctly Note that a long term drift of 0 1 mV month since last calibration is specified Power Ref Input ATC Electrode Test pH 7 0 30 mV pH 4 169 to 186 mV more than pH 7 pH 10 159 to ...

Страница 23: ...mV 0 05 if 400 mV 400 mV Temperature range 5 0 to 105 0 C Readability 0 1 C Accuracy 0 2 C Calibration points Maximum 3 buffers Automatic buffer recognition 16 buffers 2 4 7 10 12 1 3 6 8 10 13 1 68 4 0 6 86 9 18 12 46 Automatic temperature compensation Automatic electrode slope correction between 90 105 of the theoretical slope ...

Страница 24: ...KCI liquid filled platinum junction PY P11 Plastic body with built in temperature sensor gel filled PY P12 Plastic body gel filled PY P20 Glass body KCI liquid filled platinum junction PY P21 Temperature Probe PY T01 Other pH electrodes and sensors for special measuring conditions including ion selective electrodes and redox electrodes are also available on request ...

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Страница 28: ... AG Goettingen Germany All rights reserved No part of this publication may be reprinted or translated in any form or by any means without the prior written permission of Sartorius AG The status of the information specifications and illustrations in this manual is indicated by the date given below Sartorius AG reserves the right to make changes to the technology features specifications and design o...

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