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6 Calibration of the pH combination electrode

6.1

General information regarding calibration

The parameters of pH combination electrodes are subject to fluctuations due
to aging and individual variations. It is therefore advisable to check the calibra-
tion of the combination electrode before taking a measurement. If the devia-
tion is unacceptable, the combination electrode must be recalibrated.

Buffer solutions with an exact pH value are needed for calibration.

The device can be configured for the following buffer series:

• Standard series (4.01 pH, 7.00 pH, and 10.01 pH)

• DIN series (1.68 pH [A], 4.01 pH [C], 6.87 pH [D], 9.18 pH [F],

and 12.45 pH [G])

• or any buffer (neutral buffer within the range 6.5 to 7.5 pH).

6.2

Preparing for calibration

✱

Configure the device for the measurand "pH", see "Parameter "InP":
selection of a measurand", page 35

✱

Select the calibration method (1, 2 or 3 point calibration), see "Parameter
"CAL": selection of the number of calibration points", page 36

✱

Select the buffer series for the calibration, see "Parameter "CAL.P": selec-
tion of the buffer series", page 37

✱

Carefully remove the protective cap (containing 3 mol KCl) from the combi-
nation electrode.

✱

Rinse the combination electrode and the temperature probe (if available)
with de-ionized (distilled) water and dry.

CAUTION!

The operating life of buffer solutions is limited and is significantly shortened
by inadequate cleaning and drying of the combination electrode when
switching between solutions. This can lead to calibration errors!
If possible, use new solutions when calibrating.
Rinse with de-ionized or distilled water!

NOTE!

The automatic temperature compensation when calibrating

Both the signal of the pH combination electrode and the pH buffer are
dependent on temperature. A Pt1000 temperature probe (optional) con-
nected to the manual measuring device automatically compensates for tem-
perature influence.

If a temperature probe is not available, the actual temperature of the respec-
tive buffer should be entered as accurately as possible, see chapter 6.4 "Cal-
ibration without temperature probe", page 25.

The temperature influences of the buffers are also compensated for when
using the standard buffer series or the DIN buffer series.
When using any buffer, the pH values of the buffers must be entered in line
with the current temperature.

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Summary of Contents for 202710

Page 1: ...Handheld Meter for pH Redox and rH Type 202710 20 Operating Manual 20271020T90Z001K000 V2 00 EN 00461261 All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 2: ...All manuals and user guides at all guides com ...

Page 3: ...ntrol elements 13 4 3 Connections 14 4 4 Stand up hinge 14 5 Measuring 15 5 1 Preparing the device for the measurement 15 5 2 Measuring the pH value 15 5 3 Measuring the redox potential 17 5 4 Detecting the rH value 18 5 4 1 Determining the rH value by manually inputting the pH value 18 5 4 2 Determining the rH value by automatically transferring the pH value 19 5 5 Saving a measured value with th...

Page 4: ...ure input 32 8 Device settings 33 8 1 Calling up the setting menu 33 8 2 Resetting to default settings 34 8 3 Configuring the device 34 8 3 1 Submenu SEt ConF general settings 34 8 3 2 Submenu SEt Out serial interface settings 40 8 4 Parameterizing the device 41 8 4 1 Submenu SEt Corr offset zero point correction and slope correction of the voltage and temperature measurement 41 8 4 2 Submenu SEt ...

Page 5: ...handling of pH combination electrodes 50 12 The redox combination electrode 51 12 1 General handling 51 13 Returns and disposal 52 13 1 Returns 52 13 2 Disposal 52 14 Technical data 53 15 China RoHS 55 All manuals and user guides at all guides com ...

Page 6: ...Contents All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 7: ...aken CAUTION This symbol in connection with the signal word indicates that damage to assets or data loss will occur if the respective precautionary measures are not taken NOTE This symbol refers to important information about the product its handling or additional use Action instruction This symbol indicates that an action to be performed is described All manuals and user guides at all guides com ...

Page 8: ...r use of the device or in the event of misuse or malfunctions relating to the connection or the device 2 2 Intended use The device is designed to measure pH values and redox potential using appro priate sensors The sensor connection operates via a BNC socket There is also the option of connecting a temperature probe Pt1000 with banana plugs part no 00648463 The measured temperature is displayed on...

Page 9: ...ay lead to serious damage to health and material damage DANGER This device must not be used in a potentially explosive environment If the device is operated in a potentially explosive environment there is an increased hazard of deflagration fire or explosion due to formation of sparks NOTE The function and operational safety of the device can only be maintained under the climatic conditions specif...

Page 10: ...play the battery voltage is no longer sufficient for device operation and the battery is now completely used up NOTE The battery must be removed if the device is stored at an ambient tempera ture of over 50 C The battery should be removed if the device is not used for an extended period of time It is necessary to set the real time clock once again after subsequent startup CAUTION When a power supp...

Page 11: ... F Nr 00822713 01 0 1505 0001 The device was produced in the 05th calendar week of 2015 3 2 Order details 3 3 Accessories Handmessgerät 202710 20 000 F Nr 00822713 01 0 1815 0001 1 Basic type 202710 20 Manual measuring device for pH redox and rH 2 Extra code 000 none 070 including carry case with pH 4 00 and pH 7 00 calibration solutions 1 2 Order code Order example 202710 20 000 Type Part no Imme...

Page 12: ...e measured value 7 Signals that a temperature probe has been connected and that the auto matic temperature compensation ATC is thus active 8 Display elements for the appearance of the minimum MIN maximum MAX or saved measured value HLD a a The DIF display is not supported in this device 9 Main display main measured value pH value pH redox voltage mV mVH rH value rH rH mV mVH pH ATC ATC ok ok AL Lo...

Page 13: ...pH pressed briefly Display the condition of the combination electrode 1x press display the calibration data additional presses pressed for 2 seconds Start the pH calibration Scroll through the parameter sublevels of the submenu Store Hold and save the current measured value HLD in display Quit Return to measuring entries settings will be saved Set in operating modes pH rH and mVH pressed briefly m...

Page 14: ...e stand up hinge is at a position of 90 the device can be set up on an even surface When the stand up hinge is at a position of 180 the device can be hung on a hook for example 1 BNC socket to connect a pH or a redox combination electrode 2 This socket doesn t have a function please don t connect any devices 3 Socket for connecting a power supply unit 4 5 Banana sockets to connect a Pt1000 tempera...

Page 15: ...for measuring the pH value If the device has been configured for a different measurand in a user defined operation first select the measurand pH see Parameter InP selection of a measurand page 35 Definition The pH value describes the acidity or alkalinity of an aqueous solution pH values under 7 indicate acidity pH values over 7 indicate alkalinity pH 7 neutral NOTE The device is preconfigured per...

Page 16: ...lean If possible do not immerse the combination electrodes in the measurement solution beyond the shaft for a long time except for with special waterproof versions Configure the combination electrode sufficiently frequently calibration interval is dependent on the combination electrode and the usage and can vary between an hour and several weeks Use a suitable combination electrode Measuring witho...

Page 17: ...tment water monitor ing and in industry The measurement occurs with the commonly used silver silver chloride com bination electrodes reference system with 3 molar potassium chloride solu tion The measured value can be taken directly mV setting or be automati cally converted with temperature compensation to the hydrogen standard electrode reference system using the mVH setting Calibration such as w...

Page 18: ...pH value of the measurement solution must be known A redox combination electrode must be connected to the device Measuring without temperature probe Briefly press the key Adjust the temperature value of the measurement solution using the and keys Briefly press the key again Adjust the pH value of the measurement solution using the and keys Confirm and save the entries with the key Insert the redox...

Page 19: ...ice Configure the device for measurand rH Gently stir the measurement solution Measuring with temperature probe Connect the pH combination electrode to the device Save the stable measured pH value with the key HLD appears in the display The determined rH value appears on the main display the measured value for the temperature and the input value for the pH appear alter nately on the subsidiary dis...

Page 20: ...stable measured value is reached When the measured value has been saved successfully the message HLD appears on the device display Press the key again to delete the saved value When automatic saving is activated the next stable measured value will sub sequently be saved NOTE Do not switch off the device until the rH measurement is finished or the saved pH value will be deleted The determined rH va...

Page 21: ...protective cap containing 3 mol KCl from the combi nation electrode Rinse the combination electrode and the temperature probe if available with de ionized distilled water and dry CAUTION The operating life of buffer solutions is limited and is significantly shortened by inadequate cleaning and drying of the combination electrode when switching between solutions This can lead to calibration errors ...

Page 22: ...al buffer solution within the range pH 6 5 to pH 7 5 for the first calibration point The device automatically detects the buffer solutions of the technical buffer series and the DIN buffer series If the 1 point calibration has been selected as the calibration method any buffer solution can be employed so for example also pH 4 or pH 10 when selecting a technical buffer series The value 7 0 appears ...

Page 23: ...he device returns to measurement mode 6 3 2 Calibration with any buffers Calibration point 1 Press the key for at least 2 seconds to start the calibration Use the and keys to set the value for the neutral buffer solution Insert the combination electrode and the temperature probe into the first neutral buffer solution and gently stir The value of the third calibration point flashes on the main disp...

Page 24: ... the combination electrode is then briefly displayed and then the 2 point calibration is completed and the device returns to measurement mode Use the and keys to set the value for the third buffer solution Rinsing Rinse the combination electrode and the temperature probe with de ion ized distilled water and dry The set value is on the main display of the device Pt 1 and a revolving symbol appear o...

Page 25: ...NOTE If the 2 or 3 point calibration has been selected as the calibration method the device expects a neutral buffer solution within the range pH 6 5 to pH 7 5 for the first calibration point The device automatically detects the buffer solutions of the technical buffer series and the DIN buffer series If the 1 point calibration has been selected as the calibration method any buffer solution can be...

Page 26: ...e returns to measurement mode Rinsing Rinse the combination electrode with de ionized distilled water and dry Calibration point 3 Insert the combination electrode into the third buffer solution and gently stir The device detects the selected buffer solution automatically and saves the measured pH value for calibration point 3 as soon as it is stable The values 4 0 and 10 0 appear alternately on th...

Page 27: ...he yellow ok label The display changes so that the temperature value for the third buffer solution can be entered rH mV mVH pH ATC ok AL Logg pH CAL NOTE For a sufficiently accurate reading of the slope the pH values of the selected buffer solutions should not be too close together minimum gap of 2 pH from the neutral buffer NOTE If the 2 or 3 point calibration has been selected as the calibration...

Page 28: ...appears on the display above the yellow ok label Use the and keys to set the temperature value for the second buffer solution and then save by pressing the key With 2 point calibration selected the condition of the combination electrode is then briefly displayed and then the 2 point calibration is completed and the device returns to measurement mode The display changes so that the temperature valu...

Page 29: ...measurement mode 6 5 Display of the condition of the pH combination electrode Briefly press the key The value on the main display of the device flashes Pt 3 and a revolving symbol appear in the subsidi ary display of the device to indicate that the input of the pH value for the third buffer solution is expected rH mV mVH pH ATC ok AL Logg pH CAL The display changes so that the temperature value t ...

Page 30: ...ination electrode must be replaced NOTE During the evaluation both the asymmetry and the slope of the combination electrode are considered The asymmetry of the pH combination electrode is displayed for approximately 3 seconds Example asymmetry 30 mV Admissible range 55 mV Optimal 0 mV rH mV mVH pH ATC ok AL Logg pH CAL NOTE Contamination can cause the asymmetry of the combination electrode to dete...

Page 31: ...lean combination electrode recalibrate If error reoccurs replace combination electrode Wrong buffer solution Always use neutral buffer as first solution excep tion 1 point calibration Buffer solution used up Use new buffer solution The slope is too low Combination electrode is defective Buffer solution used up Replace combination electrode Use new buffer solution The slope is too high Combination ...

Page 32: ...ision water baths or similar must be available for this purpose If a correction has been carried out deviation from the default setting this is indicated with the message Corr when the device is switched on The default setting of the zero point and slope values is oFF 0 0 i e no correction performed Effect of the correction on the voltage temperature display Correction type Device display Offset z...

Page 33: ...e correction of the voltage input and the temperature input See page 41 4 Settings for the real time clock See page 43 Providing information 5 Read calibration data See page 46 6 Store Quit 6 Store Quit 6 Store Quit 4 Set Menu 6 Store Quit 2 s 2 s 1 rH mV mVH pH ATC ok AL Logg pH CAL rH mV mVH pH ATC ok AL Logg pH CAL rH mV mVH pH ATC ok AL Logg pH CAL rH mV mVH pH ATC ok AL Logg pH CAL rH mV mVH ...

Page 34: ...TE If the and keys are pressed simultaneously for over 2 seconds the device is reset to the default settings CAL 3 1 8 9 10 rH mV mVH pH ATC ok AL Logg pH CAL pH HLD 2 3 4 5 6 7 NOTE Certain parameters can only be accessed when certain device settings have been made Parameters 1 InP selection of a measurand See page 35 2 rES pH resolution of the pH display See page 36 3 CAL selection of the number...

Page 35: ...Unit t temperature unit C F See page 38 7 Auto HLD automatic saving of a measured value See page 38 8 P oFF automatic device switch off See page 39 9 Out universal output See page 39 10 Adr universal output Parameters NOTE In the following list of parameters the setting options for the default setting are shown in bold in each case Menu parameter Setting option Meaning Arrow rH Measuring detecting...

Page 36: ...een selected Use the and keys to set the number of calibration points Press the key to save the setting and move to the next parameter or press the key to save the setting and move to the next submenu of the setting menu or press the key to save the setting quit the device settings and return to measurement mode Menu parameter Setting option Meaning 0 1 Resolution in tenths pH 0 01 Resolution in h...

Page 37: ...on timer Press the key to save the setting and move to the next parameter or press the key to save the setting and move to the next submenu of the setting menu or press the key to save the setting quit the device settings and return to measurement mode Menu parameter Setting option Meaning GPH Technical buffer series capsules pH 4 7 10 PHL Technical buffer series liquid buffer pH 4 7 10 din DIN 19...

Page 38: ...e Press the key to save the setting and move to the next parameter or press the key to save the setting and move to the next submenu of the setting menu or press the key to save the setting quit the device settings and return to measurement mode Menu parameter Setting option Meaning C All temperatures stated in degrees Cel sius F All temperatures stated in degrees Fahren heit rH mV mVH pH ATC ok A...

Page 39: ... the setting quit the device settings and return to measurement mode Menu parameter Setting option Meaning 1 to 20 to 120 Switch off delay in minutes If no key is pressed the device switches off automatically once this period of time has elapsed oFF Automatic switch off deactivated permanent operation NOTE The functions of the universal output are not supported by this device The output should alw...

Page 40: ... setting menu or press the key to save the setting quit the device settings and return to measurement mode CAL 3 SAL mg l kOhm mS µS Lin nLF AL Logg K 1 cm NOTE The functions of the serial interface are not supported in this device The interface should always be deactivated in order to minimize power consump tion Menu parameter Setting option Meaning oFF Interface deactivated Minimizes the power c...

Page 41: ...ext submenu of the setting menu or press the key to save the setting quit the device settings and return to measurement mode Parameters 3 OFFS mV offset zero point correction of the voltage measurement See page 41 4 SCAL mV slope correction of the voltage measurement See page 42 3 OFFS C offset zero point correction of the temperature measurement See page 42 4 SCAL C slope correction of the temper...

Page 42: ...setting and move to the next parameter or press the key to save the setting and move to the next submenu of the setting menu or press the key to save the setting quit the device settings and return to measurement mode Menu parameter Setting option Meaning oFF no slope correction of the voltage mea surement 5 0 to 5 0 slope correction of the voltage measure ment in rH mV mVH pH ATC ok AL Logg pH CA...

Page 43: ...u SEt CLOC setting the real time clock Overview of the parameters After calling up the setting menu with and selecting the submenu SEt CLOC use to select the parameter to be configured Menu parameter Setting option Meaning oFF No slope correction of the temperature measurement 5 0 to 5 0 Slope correction of the temperature measurement in rH mV mVH pH ATC ok AL Logg pH CAL Parameters 1 CLOC setting...

Page 44: ... the next parameter or press the key to save the setting and move to the next submenu of the setting menu or press the key to save the setting quit the device settings and return to measurement mode Menu parameter Setting option Meaning HH MM Hours HH and minutes MM Press the keys to set the time in incre ments of 1 minute Press and hold the keys to continu ously move through the time setting pres...

Page 45: ...etting menu or press the key to save the setting quit the device settings and return to measurement mode 8 4 3 Submenu rEAd CAL reading the calibration data The reading of the calibration data is described separately see chapter 9 1 2 Reading the calibration data rEAd CAL page 46 Menu parameter Setting option Meaning DD MM Days DD and months MM rH mV mVH pH ATC ok AL Logg pH CAL All manuals and us...

Page 46: ... of the combination electrode Once the interval has elapsed CAL flashes in the display 9 1 2 Reading the calibration data rEAd CAL The last calibration is stored in the device with the date and calibration values and can be called up as follows Press the key for at least 2 seconds Set ConF appears in the display Keep pressing the key until rEAd CAL appears in the display Briefly press the key to s...

Page 47: ...the battery The date of the last calibration is shown in the main display The time of the last calibration is shown in the subsidiary dis play 1 With the 1 point calibration the acidic slope the alkaline slope 59 16 mV pH is assumed With the 2 point calibration the acidic slope the alkaline slope With the 3 point calibration independent acidic and alkaline values are determined rH mV mVH pH ATC ok...

Page 48: ...e measured value is above the admissi ble measuring range of the combination electrode Combination electrode is defective Send in device for repair System error Send in device for repair Measuring range exceeded or not reached by a significant margin Check whether the measured value is within the admissible measuring range of the combi nation electrode Preset calibration interval elapsed Calibrate...

Page 49: ...n no longer be obtained even after thorough cleaning When in use it is important to remember that various substances for exam ple hydrofluoric acid HF corrode glass in aqueous solutions Chemicals can react with the KCl electrolyte in the combination electrode and or cause a blockage of the diaphragm Area of application pH combination electrode version type part no Drinking water monitoring aquariu...

Page 50: ...eezing of the electrolyte The sensor part of the combination electrode should be protected against dry ing out by using a protective cap filled with 3 molar KCl solution or a storage holder Lengthy storage in de ionized distilled water will result in a depletion of the KCl within the combination electrode Air bubbles in the membrane ball can be removed by a sharp flicking action like flicking a gl...

Page 51: ... 00307114 is recommended The platinum tip of the sensor can be cleaned with ordinary scouring powder rinse well afterward If the combination electrode malfunctions Function test with a second reference combination electrode Replace combination electrode Solutions for calibration cleaning and activation can be obtained from labora tory suppliers Recommended redox combination electrodes Reference sy...

Page 52: ...t packaging when returning the device especially if the device is still functioning Ensure that the device is protected by sufficient insulation material in the packaging DISPOSAL Hand in empty batteries at the corresponding collection points Do not dispose of the device in the household waste Should the device need to be disposed of please send this directly to us with the sufficient postage We w...

Page 53: ...libration 2 4 digit 7 segment LCD displays main display 12 4 mm high subsidiary display 7 mm high with additional symbols Calibration memory Adjustable calibration intervals 1 to 365 days CAL warning after expiry Min max memory Maximum and minimum value for conductivity are saved together with the temperature at which the extreme value occurred Hold function Standard hold function at the push of a...

Page 54: ...tched off Battery display and bAt displayed automatically when battery is used up The device complies with the significant protection requirements defined in the Directive of the Council on the approximation of the laws of the Member States relating to electromagnetic compatibility 2004 108 EC Additional error 1 Part no 00454356 Manual measuring device type 202710 30 9 V battery operating manual P...

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Page 56: ...15 China RoHS 56 All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 57: ...All manuals and user guides at all guides com ...

Page 58: ...rmany Phone 49 661 6003 0 Fax 49 661 6003 607 Email mail jumo net Internet www jumo net JUMO House Temple Bank Riverway Harlow Essex CM20 2DY UK Phone 44 1279 63 55 33 Fax 44 1279 62 50 29 Email sales jumo co uk Internet www jumo co uk 6733 Myers Road East Syracuse NY 13057 USA Phone 1 315 437 5866 Fax 1 315 437 5860 Email info us jumo net Internet www jumousa com All manuals and user guides at al...

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