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horiba d-51, Instruction Manual

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2  Taking Measurements   

2.5  Measuring pH   

D-51

19

2.5

Measuring pH

The following shows the  operational  flow  for  pH       
measurement. 

●

Measuring pH: basic operational flow

Power ON 

1.  Electrode preparation

2.  pH Measurement mode screen (instantaneous value)

“

●

 Setting the clock” page 35

3.  Standard solution calibration

Preparation for standard solution

“3.4.3  pH standard solution setting” page 37

“3.4.4  Temperature compensation setting” page 41

 

4.  Auto Hold Calibration

“

●

 pH repeatability check” page 26

 

“

●

 pH calibration history” page 32

5.  pH Measurement mode screen (instantaneous value)

6.  Auto Hold Measurement

“3.1  Data memory function” page 29

Clear HOLD

Summary of Contents for d-51

Page 1: ...For more information please contact us ExpotechUSA 10700 Rockley Road Houston Texas 77099 USA 281 496 0900 voice 281 496 0400 fax E mail sales expotechusa com Website www ExpotechUSA com...

Page 2: ......

Page 3: ...HORIBA should occur during this period necessary exchange or repairs shall be conducted by HORIBA free of charge The warranty does not cover the following Any trouble or damage attributable to actions...

Page 4: ...ment categories and FCC Warning This equipment has been tested and found to comply withthe limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide...

Page 5: ...o cause fire or accidents Do not disassemble or modify the meter Heat or fire may occur to cause fire or accidents CAUTION Do not use the serial communication or AC adapter in the place that may possi...

Page 6: ...ury CAUTION This indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert unsafe practices This mark indicates the operation...

Page 7: ...ding the connector part Do not pull the cable part it may cause a breakage Do not remove the battery gasket or twist it When opening the battery case make sure that no foreign matter is attached to th...

Page 8: ...15 2 3 Measurement modes 16 2 4 Selecting the measurement modes 18 2 5 Measuring pH 19 3 Functions 29 3 1 Data memory function 29 3 2 pH calibration history display 32 3 3 Displaying and setting the...

Page 9: ...NTENTS VI HORIBA 5 Reference 69 5 1 pH measurement 70 5 2 Specifications 76 5 3 Default settings 77 5 4 Operation flowcharts 78 5 5 Spare and optional parts 79 5 5 1 Spare parts list 79 5 5 2 Options...

Page 10: ...his chapter explains the part names how to connect the electrodes how to replace the batteries and precautions when using the meter 1 1 Package contents The following items are shipped with each HORIB...

Page 11: ...w of the Meter 1 1 Package contents 2 HORIBA Soft case 1 pc Operation manual 1 book To take measurements you will need electrode s Refer to 5 5 Spare and optional parts page 79 when purchasing the ele...

Page 12: ...the data of measured values and temperature to the memory max 300 items page 29 pH repeatability check Displays the difference between the calibration value and measured value after calibration page...

Page 13: ...pensation MTC mode that uses user specified temperature page 41 Function Explanation Page No LCD check Enables check for whether or not all LCD segments are displayed page 44 Battery voltage check Ena...

Page 14: ...of the Meter 1 3 Part names D 51 5 1 3 Part names The D 51 pH meter has the following parts Portion for attaching strap Dry cell battery holder Display AC connector Keys Electrode connector Temperatur...

Page 15: ...etting modes Measurement data hour and minute HOLD Setting modes differ according to model Electrode status Part name Display Contents Input channel Measurement item Input channel 1 Displayed when mea...

Page 16: ...played while the data is held HOLD status Blinks during measurement or calibration Electrode status Only in pH Measurement mode Not displayed Normal Blinking Cleaning is needed Constant display Replac...

Page 17: ...scription MEAS key Returns to the Measurement mode Starts measurement MODE key Selects measurement item SET key Selects setting item CAL key Enters the Calibration mode Starts calibration UP key Execu...

Page 18: ...tal portion when turning the electrode conenctor The following connectors are used depending on electrode type Electrode connector G R electrode 1 Insert the electrode connector making sure to align t...

Page 19: ...t on without turning it The meter will be waterproof only if this cover is placed properly over the connector Temperature connector 1 Insert the temperature connector into the jack on the main unit un...

Page 20: ...ock data remove and replace the batteries while the meter is connected to the AC adapter sold separately Replace the batteries only after turning the power OFF Any saved data will not be lost When ope...

Page 21: ...rt the edge of the battery cover into the grooves on the meter and then tighten the stop screw Check that the rubber packing is twisted and no foreign matter is stuck to it Otherwise the meter may no...

Page 22: ...n AC adapter specifications When the AC adapter is connected the meter is no longer waterproof Be careful not to let water get into the meter Supply voltage range 100 200 V AC Frequency range 50 60 Hz...

Page 23: ...1 Overview of the Meter 1 8 Connecting the AC adapter 14 HORIBA...

Page 24: ...ey turns the power on off The ON OFF key functions when it is pressed continuously for about one second to protect against accidental operation 2 2 Settings required before measurement The built in cl...

Page 25: ...solution being measured Instantaneous Value Measurement mode The D 51 pH meter performs instantaneous value measurement as the default measurement mode when the power is first turned ON and when the a...

Page 26: ...itial screeen displayed to make HOLD blink on the display When the measured value becomes stable HOLD will stop blinking and remain displayed and the measured value will remain displayed To clear the...

Page 27: ...cting the measurement modes Pressing the MODE key changes the measurement mode The last measurement mode item is the clock display Pressing the MODE key once more returns the display to the first meas...

Page 28: ...e screen instantaneous value Setting the clock page 35 3 Standard solution calibration Preparation for standard solution 3 4 3 pH standard solution setting page 37 3 4 4 Temperature compensation setti...

Page 29: ...tial screen will appear Chemical solution The liquid inside the electrode is highly concentrated potassium chloride 3 33 mol L KCl If the internal solution in the electrode comes in contact with your...

Page 30: ...displayed Standard solutions for calibration are defaulted to pH 2 pH 4 pH 7 pH 9 and pH 12 3 4 3 pH standard solution setting page 37 This section will explain how to conduct a two point calibration...

Page 31: ...with filter paper or tissue paper 3 Open the internal solution filler port Leave the port open while calibration is taking place Calibration at first point 1 Immerse the tip of the electrode in a beak...

Page 32: ...HOLD will stop blinking and the calibrated value will be displayed The bottle mark will be displayed indicating that calibration was conducted with pH7 standard solution To stop the calibration Press...

Page 33: ...alue stabilizes HOLD will stop blinking and the calibrated value will be displayed The bottle mark will be displayed indicating that calibration was conducted with pH 4 standard solution 4 Press the M...

Page 34: ...ot displayed The electrode is in good condition Electrode sensitivity is from 93 to 100 Blinking Electrode sensitivity has dropped to the level of 90 to 93 Make sure that you are using the right stand...

Page 35: ...calibration 1 After calibration and while still in the Calibration mode immerse the electrode in pH 7 standard solution and press the ENTER key The difference between the calibrated value and measured...

Page 36: ...e de ionized water and then wipe with filter paper or tissue paper 2 Open the internal solution filler port Leave the port open while measurement is taking place 3 Immerse the electrode all the way in...

Page 37: ...ill stop blinking and will be displayed The indicated value will remain displayed continually Refer to the Criteria for judging stability page 17 for the criteria for judging the stability of the read...

Page 38: ...easurement by pressing the key The measurement reading is stored along with the temperature data HOLD value instantaneous value ATC MTC and calibration point at the time the mea surement was taken Aft...

Page 39: ...yed number returns to 0 after 300 the maximum number 2 Press the MODE key to display the data and time Select the desired data item using the and keys 3 Press the MODE key to display the ID Select the...

Page 40: ...emory function D 51 31 If an error occurs while a data number is being displayed the error number will NOT be displayed When using a printer sold separately press the ENTER key while in the DATA OUT m...

Page 41: ...er to pH repeatability check on page 26 pH calibration history 1 Press the CAL DATA key in the pH Measure ment mode 2 Pressing the CAL DATA key toggles between the latest calibration date and the late...

Page 42: ...atus display When the meter is in a good condition When the electrode needs washing When the electrode is old and is going bad Refer to Asymmetrical potential display on page 71 pH latest check data 1...

Page 43: ...the clock 34 HORIBA 3 3 Displaying and setting the clock The clock needs to be when the meter is used for the first time or after replacing the batteries Displaying the clock Press the MODE key in the...

Page 44: ...year month day hour minute and second using the ENTER key You can set a numerical value using the and keys Set the seconds to 00 sec Pressing the ENTER key sets it to 00 3 After setting the clock pres...

Page 45: ...g Mode Selection cursor appears at the left bottom of the screen to indicate that the Setting mode is active 2 Pressing the SET key moves the Setting Mode Selection cursor one by one to allow you to s...

Page 46: ...rd solutions page 72 Display Name Description Page No pH Buffer Setting Sets the standard solution for pH calibration page 37 Temperature Compensation Setting Selects the Auto Manual mode for temperat...

Page 47: ...Functions 3 4 Setting modes 38 HORIBA The calibrated value for pH 7 standard solution is different between the NIST standards and US standards NIST standard pH 6 86 at 25 C US standard pH 7 00 at 25...

Page 48: ...d solution setting 1 Press the SET key in the Measurement mode and select the pH Buffer Setting mode 2 Press the ENTER key to toggle between NIST standard US standard USA and a user defined standard C...

Page 49: ...ard solution used for calibration using the and keys While the setting is being made CuSt will blink 3 Press the CAL key to start the calibration The measured value will be displayed and HOLD will bli...

Page 50: ...sation when using a temperature sensor of the electrode ATC is displayed When a temperature sensor is connected the current temperature is automatically displayed When no temperature sensor is connect...

Page 51: ...unctions 3 4 Setting modes 42 HORIBA 3 4 5 Maintenance mode Press the SET key in the Measurement mode and select the Maintenance mode The LCD CHECK screen Item No 00 will appear Item No Maintenance mo...

Page 52: ...stment Carries out temperature calibration when the temperature sensor is immersed in a liquid of known temperature page 46 03 Automatic power off setting Turns Automatic Power off function ON OFF and...

Page 53: ...Maintenance mode to show item No 00 2 Press the ENTER key Compare the LCD screen with this diagram to confirm that all segments of the LCD are displayed 3 Use the MODE key to proceed to the Battery vo...

Page 54: ...at approximately 2 2 V The measured voltage for batteries depends on the current The voltage shown in this mode will be a little lower than the actual voltage 1 Use the MODE key to proceed to tempera...

Page 55: ...ode in a liquid with a known temperature and set the temperature using the and keys Setting range 0 0 to 100 0 C The temperature sensor attached to the electrode maintains an accuracy of 1 C even with...

Page 56: ...he power to the meter automatically turns off if the keys are not operated for the set amount of time 1 Press the ENTER key to toggle between ON and OFF When set to ON set the time for the power to be...

Page 57: ...T Entering the Maintenance mode Data memory clear Item No 06 1 Pressing the ENTER key clears all the data stored in the memory 2 Press the MODE key to proceed to Initialization of setting item No 07 H...

Page 58: ...as purchased 1 Press the ENTER key to initialized the settings The setting values to be initialized are shown on page 77 HINT Entering the Maintenance mode 2 Press the MODE key to return to the first...

Page 59: ...3 Functions 3 4 Setting modes 50 HORIBA...

Page 60: ...r is equipped with a convenient error message function If an error message is displayed be sure to take appropriate action 4 1 pH electrode maintenance Maintain your electrodes by referring to the fol...

Page 61: ...method explained below 1 Remove the electrode from the pH meter 2 Remove the protective cap from the electrode 3 Open the internal solution filler port and use a syringe to remove the internal solutio...

Page 62: ...e paper 6 If the liquid on the inside of the electrode cap has dried wash the inside of the electrode cap with pure de ionized water and then after shaking out the water fill the cap with enough pure...

Page 63: ...electrode is so dirty that it cannot be cleaned by rinsing with pure de ionized water wash the electrode using the most appropriate method below General dirt oily grime Wipe the dirt grime off using c...

Page 64: ...the internal memory 02 Battery voltage low The battery voltage is low 03 Electrode stability error The electric potential did not stabilize within three minutes 04 Asymmetric potential error pH The a...

Page 65: ...aranteed when ERR No 02 is displayed Cause How to solve problem The pH meter does not start operating cor rectly even after the power is turned ON Take the battery from the pH meter and disconnect the...

Page 66: ...oncentration or temperature change Press the MEAS key again while HOLD is either brinking or steadily lit in the display to measure the sample using instantaneous value measurement The electrode is di...

Page 67: ...electrode is cracked Replace the electrode The reference solution concentration is fluctuating Replace the internal solution in the reference electrode The electrode is not connected correctly Connect...

Page 68: ...electrode is dirty Wash the electrode The electrode is cracked Replace the electrode Calibration was not performed correctly Redo the calibration correctly There is a problem with the standard soluti...

Page 69: ...ibration point This error does not affect calibration data obtained from previous three calibration points Refer to Standard solution calibration page 21 Cause How to solve problem Calibration was per...

Page 70: ...the standard solution Prepare new standard solution There is a problem with the standard solution setting Check the NIST or US standards settings and the kind of standard solution used for calibration...

Page 71: ...ror number Nothing shows up on the display when the power is turned ON Cause How to solve problem No batteries Place batteries in the meter The batteries are loaded with the poles reversed Re insert t...

Page 72: ...bles on the electrode Shake the electrode to remove the air bubbles There is no reference solution remaining Fill the electrode with new reference solution as noted in the electrode operation manual T...

Page 73: ...the sample solution Cause How to solve problem The liquid junction is not immersed in the sample solution Immerse the electrode in the sample solution up until the liquid junction or deeper Some effec...

Page 74: ...rode is dry or dirty Wash the responsive membrane The electrode is cracked or worn out Replace the electrode There is a problem with the reference solution Fill the electrode with new reference soluti...

Page 75: ...ing measured value disappears when this done the meter is nomal Cause How to solve problem The sample solution is inappropriate Change to a sample solution with properties within the measurement range...

Page 76: ...the electrode is severed or shorted Measure the resistance of the temperature sensor connector If it is 50 k or more at room temperature replace the electrode The electrode connector is not attached...

Page 77: ...olution The pH or other properties of the sample solution may have changed over time making repeatability poor The responsive membrane is dry or dirty Wash the responsive membrane There is not enough...

Page 78: ...ter provides a simple compilation of information for those who would like to know about the functions of the main unit of the meter and other measurement principles in greater detail It also serves as...

Page 79: ...electric potential differs depending on the type of solution the temperature of the solution and the structure of the liquid junction When solutions of different compositions come in contact ION diff...

Page 80: ...ty however a potential does occur This potential is called asymmetric potential The size of the asymmetric potential differs depending on any stress that may have occurred during the processing of the...

Page 81: ...n temperature is not recorded the results of the pH measurement are relatively meaningless Types of pH standard solutions When measuring pH the pH meter must be calibrated using a standard solution Th...

Page 82: ...ion Phthalate pH 6 86 standard solution Neutral phosphate pH 9 18 standard solution Borate pH 12 45 standard solution Saturated calcium hydroxide solution 0 1 666 4 003 6 984 9 464 13 423 5 1 668 3 99...

Page 83: ...ard settings Calibration is performed using Nernst s equation with the above values Temp C pH 7 standard solution Neutral phosphate pH 10 standard solution Carbonate 0 7 119 10 318 5 7 086 10 245 10 7...

Page 84: ...e the pH 7 standard solution or a standard solution that approximates the pH value of the solution that is to be inspected When it is known beforehand whether the test solution is acidic or alkaline 2...

Page 85: ...surement range pH 0 00 14 00 Resolution 0 01 pH Repeatability 0 01 pH 1digit Temp Measurement principle Thermistor Measurement range 0 0 100 0 C Resolution 0 1 C Repeatability 0 1 C 1digit Data memory...

Page 86: ...y Item Default values Common setting Temperature compensation Automatic temperature compensation Manual temperature compensation 25 C Automatic power OFF Approx 30 min ON pH Standard calibration solut...

Page 87: ...1 pH Measurement mode instantaneous value Clear Hold Automatic release of Hold Clock setting To pH Measurement mode 3 Calibration mode instantaneous value 2 Auto Hold Measurement Auto HOLD calibratio...

Page 88: ...ard electrode 9621 10D 9096001700 Plastic body electrode for immersion measurement F 50 series standard electrode 9611 10D 9096001800 Glass body electrode reinforced responsive glass Laboratory use el...

Page 89: ...9 standard solution 100 9 9003001800 Part name Model Part number Remarks pH2 standard solution powder 150 2 9003002600 Makes 500mL 10 packets Accuracy 0 05 pH pH4 standard solution powder 150 4 900300...

Page 90: ...marks AC adapter for the pH meter AC adapter 9096003100 Be sure to purchase the cable when purchasing the AC adapter Cable For Japan 9096003200 For US 9096003300 For Europe 9096003400 Soft case 909600...

Page 91: ...For more information please contact us ExpotechUSA 10700 Rockley Road Houston Texas 77099 USA 281 496 0900 voice 281 496 0400 fax E mail sales expotechusa com Website www ExpotechUSA com...

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