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horiba NAVI F-51, Instruction Manual

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horiba NAVI F-51 Instruction Manual Download Page 31

Chapter 2  Taking Measurements    

2.5  Measuring pH   

F-51

23

●

Measuring pH

1.

Wash the tip of electrode well with pure (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 the sample.

Immerse the pH electrode in the sample at least three centime-          
ters.

Open

Close

3 cm or 
more

Summary of Contents for NAVI F-51

Page 1: ......

Page 2: ...r for purposes other than those described in the operation manuals If any repairs renovations disassembly etc are performed on this meter by any party other than HORIBA or a party authorized by HORIBA...

Page 3: ...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 4: ...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 5: ...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 6: ...on by the fingers not by the hard object like metal stick or rod To disconnect the electrode cable or interface cable pull them out with holding the connector part Do not pull the cable part it may ca...

Page 7: ...surement 13 2 3 Measurement modes 14 2 4 Selecting the measurement modes 15 2 5 Measuring pH 16 2 6 Measuring ORP 25 Chapter 3 Functions 29 3 1 Data memory function 29 3 2 Calibration history display...

Page 8: ...When the ENTER key is pressed in the calibration history display 72 5 4 6 Test printing format in the Maintenance mode 72 Chapter 6 Maintenance and Troubleshooting 73 6 1 pH ORP electrode maintenance...

Page 9: ...lectrodes how to replace the batteries and precautions when using the meter 1 1 Package contents The following items are shipped with each HORIBA pH meter To take measurements you will need electrode...

Page 10: ...n value and measured value after calibration page 22 pH calibration history display Displays the date of calibration asymmetrical potential and sensitivity page 31 Relative mV dis play Displays mV whe...

Page 11: ...e according to the number of measurements made after calibration page 39 Sample ID ID No of the sample page 39 Name Explanation Page No LCD check Enables check for whether or not all LCD segments are...

Page 12: ...emperature electrode No CH No HOLD Measurement data hour and minute Error No Data No Year Status display Temperature month and day Input channel HOLD Electrode status Second Measurement unit Meter mod...

Page 13: ...ng called up and when manual data memory is being called up Displayed when a printer is connected Sometimes displayed when a computer is connected depending on the computer Displayed during manual tem...

Page 14: ...e Description 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 E...

Page 15: ...Chapter 1 Overview of pH Meter 1 5 Assembling the electrode stand F 51 7 1 5 Assembling the electrode stand 1 Mount the electrode stand on the rear of the meter as shown in the figure below...

Page 16: ...nector 1 Insert the electrode connector making sure to align the connector grooves with the pins in the connector port on the main unit Do not push the electrode connector with undue force when the pi...

Page 17: ...lectrodes F 51 9 Temperature connector 1 Insert the temperature connector into the jack on the main unit of the pH meter When the temperature electrode is not connected or is connected improperly the...

Page 18: ...will erase the clock data To save the clock 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...

Page 19: ...specifications 1 Connect the connector of the AC adapter to AC adapter connecting port on the side of the meter Supply voltage range 100 200 V AC Frequency range 50 60 Hz Current rating Max 370 mA Cl...

Page 20: ...Chapter 1 Overview of pH Meter 1 8 Connecting the AC adapter 12 HORIBA...

Page 21: ...ON OFF key 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 bui...

Page 22: ...nt is cancelled or cleared Auto Hold Measurement mode Auto Hold Measurement mode maintains the display of the value measured when the meter automatically judges that the measured value has stabilized...

Page 23: ...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 measurement mode Power ON...

Page 24: ...g the clock page 33 3 Standard solution calibration Preparation for standard solution 3 4 2 pH standard solution setting page 35 3 4 3 Temperature compensation setting page 38 3 4 5 Sample ID setting...

Page 25: ...s value measurement 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 con...

Page 26: ...faulted to pH 2 pH 4 pH 7 pH 9 and pH 12 3 4 2 pH standard solution setting page 35 This section will explain how to conduct a two point calibration using pH 7 and pH 4 standard solutions Calibration...

Page 27: ...H 7 standard solution Immerse the pH electrode in the sample at least three centime ters 2 Press the CAL key to start calibration The measured value will be displayed and HOLD will blink until the rea...

Page 28: ...ng stabilizes When the value 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 standar...

Page 29: ...inking Electrode sensitivity has dropped to the level of 90 to 93 Make sure that you are using the right standard solution Clean the electrode Washing the electrodes page 76 Displayed Electrode sensit...

Page 30: ...r 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 measur...

Page 31: ...pure 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...

Page 32: ...ilizes HOLD will stop blinking and will be displayed The indicated value will remain displayed continually Refer to the Criteria for judging stability page 14 for the criteria for judging the stabilit...

Page 33: ...ed for that purpose mV measurement with the pH electrode shows the potential of the electrode This measurement is useful for checking samples and the performance of the electrode Refer to the electrod...

Page 34: ...t screen will appear 3 Press the MEAS key while the Instantaneous Value Measurement screen is displayed HOLD will blink on the display until the reading stabilizes When the value stabilizes HOLD will...

Page 35: ...tantaneous Value Measurement mode REL is displayed under mV and the current reading value becomes the offset potential used for compensation and the meter will display the relative mV instantaneous va...

Page 36: ...Chapter 2 Taking Measurements 2 6 Measuring ORP 28 HORIBA...

Page 37: ...easurement reading is stored along with the temperature data HOLD value instantaneous value ATC MTC calibration point pH and sample ID at the time the measurement was taken After the data number is di...

Page 38: ...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 desired data item using the and keys If an error occurs while a data...

Page 39: ...is displayed 2 Pressing the CAL DATA key toggles between the latest calibration date and the latest check date The latest check date is not displayed if no repeatability check has been performed Late...

Page 40: ...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 ERR 04 Asymmetric potential error page 80 pH latest check data 1...

Page 41: ...CAL key when the Clock Display screen is displayed to show the Setting screen for the clock 2 Switch the display to year month day hour minute and second using the ENTER key Set a numerical value usi...

Page 42: ...e by one to allow you to select the Setting mode of your choice 3 Press the MEAS key to return to the Measurement mode from the Setting mode Setting Mode Selection cursor Setting mode items Setting mo...

Page 43: ...e 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 C Maintenance Sets various maintenance re...

Page 44: ...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 Japanese standard NIST US standard USA and a user defined s...

Page 45: ...dard solution used for calibration using the and keys While the setting is being made the CuSt will blink 3 Press the CAL key to start the calibration The measured value will be displayed and HOLD wil...

Page 46: ...compensation when using a temperature sensor of the electrode ATC is displayed When a temperature sensor is connected the current temperature is automatically displayed When notemperature sensor is co...

Page 47: ...e Calibration Interval Setting mode 2 Pressing the ENTER key toggles the calibration frequency setting between ON and OFF 3 Specify a numerical value using the and keys Setting range 1 to 400 days 3 4...

Page 48: ...y voltage check page 42 02 Tempera ture zero adjustment Carries out temperature calibration when the temperature sensor is immersed in a liquid of known temperature page 43 03 Automatic power off sett...

Page 49: ...he 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...

Page 50: ...s set at approximately 4 4 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 te...

Page 51: ...rature 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 without calibration The mode should be...

Page 52: ...ON the power to the pH 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 powe...

Page 53: ...HINT 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 0...

Page 54: ...urn the pH meter to the original settings when the meter was purchased 1 Press the ENTER key to initialized the settings 2 Use the MODE key to proceed to Printer connection and printing test item No 0...

Page 55: ...test When conditions are normal End is displayed When conditions are not normal Err is displayed 2 Press the MODE key to return to the first item in the maintenance modes LCD check Test print format H...

Page 56: ...Chapter 3 Functions 3 4 Setting modes 48 HORIBA...

Page 57: ...the on line mode may not start up and RS 232C communications cannot proceed normally If the transfer format is changed turn the power to both the pH meter and the computer OFF and then ON again When c...

Page 58: ...message is returned in the OFF LINE mode The meter returns a response to any operation made in the following format OK CR LF If the pH meter does not accept the operation it returns an error mes sage...

Page 59: ...nt mode designation command MV page 52 Start measurement MS page 53 Start pH standard solution calibration CP page 53 Clear calibration CC page 53 Data clear DC page 54 Data IN designation IN page 54...

Page 60: ...s displayed pH Measurement mode designation command format This command is always valid when on line The meter changes the status to pH Instantaneous display for the selected channel number mV Measure...

Page 61: ...solution calibration command format This command is valid when on line during pH measurement or HOLD is being displayed This command is valid only when the meter is set for NIST or USA calibration Is...

Page 62: ...ommands 54 HORIBA Data clear command format This command clears the data retained in the memory Data IN designation command format Power Off command format Command code Data clear Header Header Comman...

Page 63: ...Format of responses from meter When no operation can be received ER n CR LF n 0 Communications error 1 Command code does not exist 2 Unacceptable timing entered 3 Data exceeds range When operation ha...

Page 64: ...l 5 digit value including decimal point and sign Slope sensitivity potential 5 digits including decimal point and sign Potential is output for 1 point and 2 point calibration data Year 4 digit A D Mon...

Page 65: ...date time The slope is valid only for calibration with 2 or more points and the slope value for the third point will be a space If the check before use has been performed this data will be sent after...

Page 66: ...onses 58 HORIBA Clock data request command and response Request command format Meter response format Command code Header Seconds 2 digit 0 59 Minutes 2 digit 0 59 Hours 2 digit 0 23 Day 2 digit 01 31...

Page 67: ...5 digit Measurement mode 1 digit 0 pH 1 mV Channel number 1 digit 1 1CH Measurement or calibration 1 digit 0 Measurement 1 Calibration Measurement status 1 digit 0 Instantaneous value 1 Hold 2 Potenti...

Page 68: ...tion type is 0 The latest data is output regardless of occurrence of measurement errors 1 SP is output when any calibration error is produced Potential 5 digit Lead zero is suppressed Temperature 5 di...

Page 69: ...ommunications 4 4 Data request commands and responses F 51 61 Request command for number of stored data items and its response Request command format Meter response format Header Command data Header N...

Page 70: ...ual data IN 1 Auto data IN Measurement value 6 digit Seconds 2 digit 0 59 Minutes 2 digit 0 59 Hours 2 digit 0 23 Day 2 digit 01 31 Month 2 digit 01 12 Year 4 digit A D lead zero is suppressed Ion slo...

Page 71: ...bration type is 0 The latest data is output regardness of occurrence of measurement errors 1 SP is output when any calibration error is produced Potential 5 digit Lead zero is suppressed Temperature 5...

Page 72: ...odel and its response Request command format Meter response format Request command for software version and its response Request command format Meter response format Header Command code Lot No 7 digit...

Page 73: ...s Accessories Communications HyperTerminal The HyperTerminal program Hypertrm exe is activated 2 Make the setting for name connection and port Select the COM port of your PC currently being used for t...

Page 74: ...erminal by enabling the Echo typed characters locally E option 5 Command input If a command is input the corresponding response data is sent back Command input should be completed within 10 seconds Be...

Page 75: ...Seiko DPU H245AS A03A Heat sensitive paper Attach the printer cable to the printer output connector Connect your printer only after turning OFF the power to the main unit of the pH meter For the layo...

Page 76: ...and prepare the printer paper and ink ribbon Keep the LF key held down The printer prints only when the LF key is being pressed Setting for a thermal paper printer DPU H245AS Prepare printer paper and...

Page 77: ...neous value is being displayed in the Measurement mode When the manual data memory storage is performed in the Measurement mode When pressing the ENTER key while in the Data Memory Call mode When cali...

Page 78: ...H Measurement mode mV Measurement mode When the data is the data confirmed with Auto Hold HOLD is shown Nothing is displayed for the instantaneous value mea surement ID 5 digits Temperature compensati...

Page 79: ...ressed in the Measurement mode page 70 Example in the pH Measurement mode 5 4 3 When the ENTER key is pressed in the Data Memory Call screen The format is the same at that described in 5 4 2 When the...

Page 80: ...GOOD good condition CHECK Washing is needed BAD Replace Sensitivity display Standard solution value is dis played No calibration 1 point calibration None 2 point calibration 1st item 3 point calibrat...

Page 81: ...be sure to take appropriate action 6 1 pH ORP electrode maintenance Maintain your electrodes by referring to the following information or to the operation manuals for the electrodes The following exp...

Page 82: ...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 solution Chemical warning The liquid insid...

Page 83: ...tissue 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...

Page 84: ...g with pure de ionized water wash the electrode using the most appropriate method below General dirt oily grime Wipe the dirt grime off using cotton gauze that contains a neutral detergent Inorganic g...

Page 85: ...mory 02 Battery voltage low The battery voltage is low 03 Electrode stability error The electric potential did not stabilize within three minutes 04 Asymmetry potential error The asymmetric potential...

Page 86: ...e guaranteed when ERR No 02 is displayed Cause How to solve problem The pH meter does not start operating correctly even after the power is turned ON Take the battery from the pH meter and disconnect...

Page 87: ...concentration or temperature change Press the MEAS key again while HOLD is either blinking or steadily lit in the display to measure the sample using instantaneous value measurement The electrode is d...

Page 88: ...trode is not connected correctly Connect the electrode correctly The electrode is not submerged deeply enough to cover the liquid junction tip Immerse the electrode in the sample at least three centim...

Page 89: ...has been exceeded since the last calibration was conducted Calibrate again Cause How to solve problem Calibration was performed on a fourth calibration point Limit the number of calibration points to...

Page 90: ...tion The number of data items has exceeded the limit of the memory Cause How to solve problem The printer paper is jammed Remove the jammed paper There is no printer paper Load the printer with paper...

Page 91: ...error 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 inser...

Page 92: ...Fill the electrode with new reference solution as noted in the electrode operation manual The wrong reference solution is being used Use the correct reference solution Cause How to solve problem Ther...

Page 93: ...worn out Replace the electrode There is a problem with the reference solution Fill the electrode with new reference solution as noted in the electrode instruction manual Cause How to solve problem The...

Page 94: ...by touching both the center pin in the electrode connector and some metal part Cause How to solve problem The sample solution is inappropriate Change to a sample solution with properties within the m...

Page 95: ...n 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 96: ...ed When running a test print according to the manual does it print out correctly Cause How to solve problem Some effects of the sample solution The pH or other properties of the sample solution may ha...

Page 97: ...When solutions of different compositions come in contact ion diffusion occurs on the contact surface between the two solutions The ions are of various sizes so a difference occurs in the diffusion tr...

Page 98: ...orded along with that pH value even if a meter that has automatic temperature compensation is used If the solution temperature is not recorded the results of the pH measurement are relatively meaningl...

Page 99: ...ution 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...

Page 100: ...tandard 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...

Page 101: ...n Use 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 alkali...

Page 102: ...otential to generally be expressed by the following equation E Electric potential E0 Coefficient R Gas coefficient T Absolute temperature n Electron count F Faraday constant a Activity Fig 1 ORP measu...

Page 103: ...y of a solution The measurement of ORP is widely used however as an important index in the analysis of solutions potentiometric titration and in the disposal and treatment of solutions Recently variou...

Page 104: ...at is measured using an Ag AgCl with 3 33 mol L KCl electrode is expressed by the following equation EN H E E 206 0 7 t 25 mV t 0 60 C EN H E Measured ORP value using N H E as the reference electrode...

Page 105: ...stances it is sufficient to use only that type of substance which is closest to the measured value Indicated value of ORP standard solution at various temperatures mV temp C 160 22 Phthalic acid chlor...

Page 106: ...g the electrode or by soaking the electrode in diluted nitric acid 1 1 nitric acid 5 If measurements within 15 mV of the values are still not obtained after re measuring the reference electrode or the...

Page 107: ...on 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 mV Measurement range 1999 mV Resolution 1 mV Rep...

Page 108: ...values Common settings Temperature compensation Automatic temperature compensation Manual temperature compensation 25 C Automatic power OFF Approx 30 min ON Sample ID 00000 Calibration cycle OFF pH S...

Page 109: ...pH Measurement mode instantaneous value Clear Hold Automatic release of Hold 4 mV Measurement mode instantaneous value 6 Relative mV Measurement mode 5 Auto Hold Measurement 7 Auto Hold Measurement C...

Page 110: ...ter CBM 910 24RJ100 A 7 6 3 Cable for SEIKO printer DPU H245AS A03A Meter main unit MINI DIN8M Printer D SUB 9 PIN 2 CTS 7 RTS 3 TXD 2 RXD 4 GND 5 GND 5 RXD 3 TXD Meter main unit MINI DIN8M Printer D...

Page 111: ...dy electrode for immersion measurement F 50 series standard electrode 9611 10D 9096001800 Glass body electrode reinforced responsive glass Laboratory use electrode for slurry samples 9677 10D 90960020...

Page 112: ...pH2 standard solution powder 150 2 9003002600 Makes 500 mL 10 packets Accuracy 0 05 pH pH4 standard solution powder 150 4 9003002700 pH7 standard solution powder 150 7 9003002800 pH9 standard solutio...

Page 113: ...se the cable when purchasing the AC adapter Cable For Japan 9096003200 For US 9096003300 For Europe 9096003400 Plain paper printer Printer For Japan 9096003500 For US 9096003600 For Europe 9096003700...

Page 114: ...For any question regarding this product please contact your local agency or inquire from the Customer Registration website www horiba co jp register First edition August 2003 CODE I1001385000...

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