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Hanna Instruments HI84531 Instruction Manual Download Page 42

42

pH 

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EASU

rE

m

ENT

16.  pH MEASUREMENT

The 

HI84531

 can be used as a pH meter for direct measurements.

Verify that the instrument has been calibrated before taking pH measurements. Set the instrument to 
pH meter. From titrator mode press 

Meter

 until pH units are displayed.

If an electrode calibration hasn’t been performed, or the number of days exceeds the calibration time 
out value set, the message “CAL DUE” will blink on the left side of the display (see Calibration Timeout 
option in SETUP MENU section for details).
If “CAL DUE” is displayed, perform an electrode calibration.

Press 

MENU

 to access the instrument’s menu.

Press 

HELP

 to view the contextual help, every time you need additional information.

Press 

STIR

 to start/stop the stirrer.

Press 

Titrator

 to enter titration mode.

Press 

CAL

 to access the calibration menu.

Press 

LOG

 to save the current reading. A message indicating the free log space will be displayed for 

a few seconds.

In order to take pH measurements, follow the next steps:
• Submerge the tip of pH electrode 2 cm (0.8’’) and the temperature probe into the sample to be 

tested and stir gently. Allow time for the electrode to stabilize. When the reading becomes stable, 
the   (unstable measurement) symbol will disappear.

• If the pH reading is less than -2.00 pH or greater than 16.00 pH, the closest full-scale value will 

be displayed blinking.

Summary of Contents for HI84531

Page 1: ...INSTRUCTION MANUAL HI84531 Total Alkalinity Mini Titrator pH Meter for Water Analysis ...

Page 2: ...anna Instruments product Please read this instruction manual carefully before using this instrument This manual will provide you with the necessary information for correct use of this instrument as well as a precise idea of its versatility If you need additional technical information do not hesitate to e mail us at tech hannainst com or view our worldwide contact list at www hannainst com Dear Cus...

Page 3: ... Calibration Procedure 24 11 pH Buffer Temperature Dependence 28 12 Dosing Pump Installation 29 13 Dosing Pump Prime Procedure 30 14 Pump Calibration Procedure 32 15 Titration Procedure 36 15 1 Tips for an Accurate Measurement 39 15 2 View Delete Titrator Recorded Data 39 15 3 Titrator GLP Information 41 16 pH Measurement 42 16 1 View Delete Recorded pH Data 43 16 2 pH Meter GLP Information 44 17 ...

Page 4: ...70 Reagent kit for titrable alkalinity in water HI7082 Electrode fill solution 100 mL beaker 2 pcs Dosing pump valve 5 mL syringe 2000 µL automatic pipette with two plastic tips 20 mL beaker 2 pcs Tube set aspiration tube with titrant bottle cap and dispensing tube with tip Stir bar Power adapter Instrument quality certificate Instruction manual Note Save all packing material until you are sure th...

Page 5: ...d Acid base titration Principle Endpoint titration pH 4 50 or pH 8 30 Pump speed 10 mL min Stirring speed 600 rpm Log data Up to 200 samples pH Meter Range 2 0 to 16 0 pH 2 00 to 16 00 pH Resolution 0 1 pH 0 01 pH Accuracy 0 01 pH Calibration 1 2 or 3 calibration points 4 available buffers 4 01 7 01 8 30 10 01 Temperature compensation Manual or automatic mV Meter Range 2000 0 to 2000 0 mV Resoluti...

Page 6: ...I7662 T Environment 0 to 50 C 32 to 122 F max 95 RH non condensing Power supply 12 Vdc power adapter Dimensions 235 x 200 x 150 mm 9 2 x 7 9 x 5 9 Weight 1 9 kg 67 0 oz Required Reagents HI84531 50 Low Range Titrant HI84531 51 High Range Titrant HI84531 55 Calibration Standard ...

Page 7: ...ent is ready for another titration by pressing the Restart key A dedicated HELP key aids in setup calibration status and troubleshooting Other features pH meter mV meter Stir speed control Data can be stored using the log feature and then exported to a USB stick or transferred to a PC using the USB connection Log on demand for up to 400 samples 200 for pH measurements 200 for titration results GLP...

Page 8: ...thods refers two types of alkalinity 1 Strong Alkalinity or Phenolphthalein Alkalinity is typically determined by a titration to pH 8 3 2 Total Alkalinity or Bromcresol Green Alkalinity is typically determined by a titration to pH 4 5 The water sample is titrated until a fixed pH endpoint 4 5 or 8 3 the endpoint is determined by the potentiometric input ...

Page 9: ...e phenolphthalein or bromocresol green however this endpoint can be become objective depending on the analysts The HI84531 removes this issue by titrating to a fixed pH endpoint 4 5 or 8 3 determined by the user The concentration can vary significantly with the selected pH endpoint For precise analysis the sample size volume of titrant added and titrant concentration must be known The HI84531 Tota...

Page 10: ... 4 1 Dosing pump valve 2 Aspiration tube 3 Titrant bottle 4 Dispensing tube 5 Syringe 6 Temperature probe 7 pH electrode 8 Electrode holder 9 Beaker Top View 1 4 6 5 2 3 1 Titrant bottle 2 Dispensing tube 3 Electrode holder 4 Liquid Crystal Display LCD 5 Functional keys 6 Keypad ...

Page 11: ...o the previous screen or to the main screen In Setup menu exits a parameter without changing the value Press ARROW keys to modify parameter values scroll through help screens or move between Setup options Press CAL key to access the Electrode and Pump calibration options Press HELP key to access exit the instrument s contextual help Press LOG key to save the current mV pH reading in pH meter mode ...

Page 12: ...unning blinks when stirrer is not working properly Pump running Unstable reading Parameter can be modified Dosing Pump The dosing pump is based on a valve that automatically moves the titrant between the titrant bottle and syringe when filling the syringe and between the syringe and sample when dispensing A replaceable 5 mL plastic syringe is used to limit the amount of titrant used per test to en...

Page 13: ...e temperature sensor to the instrument Calibrate the pH electrode Connect the tubes and the valve See the DOSING PUMP INSTALLATION section for the procedure Remove the titrant bottle cap and replace it with the bottle cap with tubes Place the titrant bottle in the appropriate place on the titrator top Note Different titrants are required based on the concentration See PUMP CALIBRATION PROCEDURE fo...

Page 14: ...the setup parameters Press HELP to view the contextual help Press ESC to return to the main screen Concentration Unit mg L or meq L Press the corresponding virtual option key to change the option Measurement Range LR or HR Use the table below to determine the appropriate range Press the corresponding virtual option key to change the option Note Different titrant solutions are required for each ran...

Page 15: ...mple pH 4 5 pH 8 3 pH 4 5 pH 8 3 pH Calibration Timeout Disabled or 1 to 7 days Set the number of days before the pH calibration expired warning message is displayed Press Modify to access the calibration timeout screen Use the ARROW keys to select the value Press Select to confirm or ESC to return to the setup menu without saving the changes pH Resolution 0 1 or 0 01 Press the displayed virtual o...

Page 16: ...e date format Press Format to cycle between the available date formats Press to highlight the value to be modified Use the ARROW keys to change the value Press Accept to confirm the new value or ESC to return to the setup Key Beep Select Enable to activate or Disable to deactivate the Key Beep function If enabled a short beep will be heard every time a key is pressed Error Beep Select Enable to ac...

Page 17: ...the ARROW keys or to increase decrease the value Press Accept to confirm the value or ESC to return to the setup menu LCD Backlight Press Modify to change the backlight level The default value is 3 Use the ARROW keys or to increase decrease the backlight level Press Accept to confirm or ESC to return to the setup menu Language The only available language is English ...

Page 18: ...to view the firmware version language version mV factory calibration date and time temperature factory calibration date and time and method version Press ESC to return to the setup menu Restore Factory Settings Press Select to restore the factory settings Press Yes to confirm the restore process or No to return without restoring Press ESC to return to the setup menu ...

Page 19: ... screen when a titration is in progress Prime burette screen Prime burette screen when the dosing system is running This error message appears when the pump is not working properly Check the tubing valve and syringe Press Restart to try again This screen appears when the titrator is in calibration mode Press Pump to calibrate Pump Press Electrode to calibrate pH Electrode ...

Page 20: ...ximum amount of titrant is exceeded Check standard electrode and or dosing system and try again The calibration was outside the acceptable limits Prepare a new standard and try again This error message appears when the pH reading exceeds the acceptable input limits 2 00 pH 16 00 This screen appears when the stirrer is not working properly Check the stir bar and beaker content Press Restart to try ...

Page 21: ...t the calibration or Clear to restore the default calibration The Wrong Buffer message is displayed when the pH value is outside of the acceptable range Clean the electrode by following the Cleaning Procedure and or check the buffer concentration before continuing the pH calibration Press the ESC key to exit pH calibration mode ...

Page 22: ...rt another titration or ESC to return to the main screen This error message appears when the input reading pH or temperature exceeds the specified limits The pH or temperature value and the concentration will blink indicating an error This screen appears when the sample concentration is out of range This screen appears when the stirrer is not working properly Check the stir bar and beaker content ...

Page 23: ...ll disappear when rinsed with distilled deionized water During transport tiny bubbles of air may have formed inside the glass bulb The electrode cannot function properly under these conditions These bubbles can be removed by shaking down the electrode as you would do with a glass thermometer If the bulb is dry soak the electrode in HI70300 Storage solution for at least one hour ...

Page 24: ...sed 8 30 pH is recommended Note The HI84531 will not accept other pH buffers for calibration Pour small quantities of selected buffer solutions into clean beakers For accurate calibration use two beakers for each buffer solution the first one for rinsing the electrode and the second one for calibration Put a magnetic stir bar in the beaker that will be used for calibration Remove the protective ca...

Page 25: ...ion point Two Point Calibration The calibrated value will be shown on the display and the second expected buffer value will be displayed Remove the electrode holder with electrodes from the top of the beaker Place the second beaker with calibration buffer in the beaker holder Rinse the electrodes in a beaker containing the second buffer rinsing solution Place the electrode holder with electrodes o...

Page 26: ...able When the reading is stable and close to the selected buffer the unstable measurement symbol will disappear and the Confirm key will become active Press Confirm to confirm the calibration The instrument stores the calibration value and returns to calibration menu where the date and time for the pH calibration will be updated Note A buffer confirmed during the calibration process is removed fro...

Page 27: ...current calibration point The instrument will keep all the confirmed values during the current calibration If the temperature reading is out of the defined temperature range of the buffer 0 to 45 C the Wrong Buffer Temperature error message will be displayed and the temperature symbol will blink on the display Calibration cannot be confirmed in this situation Notes To clear a previous calibration ...

Page 28: ...cally calibrate to the pH value corresponding to the measured or set temperature TEMP pH BUFFERS C F 4 01 7 01 8 30 10 01 0 32 4 01 7 13 8 48 10 32 5 41 4 00 7 10 8 44 10 24 10 50 4 00 7 07 8 41 10 18 15 59 4 00 7 04 8 37 10 12 20 68 4 00 7 03 8 33 10 06 25 77 4 01 7 01 8 30 10 01 30 86 4 02 7 00 8 27 9 96 35 95 4 03 6 99 8 24 9 92 40 104 4 04 6 98 8 21 9 88 45 113 4 05 6 98 8 18 9 85 During calib...

Page 29: ... on the top of the meter 4 Arrange the bottom of the syringe into the pump holder Once the syringe is in place lower the barrel until it sits flush on the holder 5 Put the o ring and syringe fixing nut over the syringe Turn clockwise to secure it in place 9 8 7 6 Front view 6 Place the valve on top of the syringe Ensure it fits securely 7 Insert the aspiration tube into the valve left side 8 Repla...

Page 30: ... titrations Two rinses cycles of syringe are shown in the figure below The dispensing tube is connected to the top of the valve and the aspiration tube on the left side Note The aspiration tube must be inserted in the titrant bottle The dosing tip must be placed over a rinse beaker To prime the burette select Prime option from Titration mode Adjust the rinses number by pressing the ARROW keys and ...

Page 31: ...use the prime process press the Pause to continue press the Continue To stop the prime process press Stop Note This error message appears when the pump is not working properly Check the tubing valve and syringe Press Restart to try again ...

Page 32: ...performing a calibration in high range dispense roughly 1 mL of titrant in a waste beaker This will remove any air bubbles in the tubing Press Prime then Stop once the volume has been delivered Sample preparation Use a clean pipette to add precisely measured amount of HI84531 55 Calibration Standard to a clean beaker as indicated below Low Range LR Strong LR Total 2 ml 30 0 400 0 mg L as CaCO3 Hig...

Page 33: ...nd immerse into the calibration solution until the reference junction is completely submerged Be sure that the tip of the electrode is not hitting the stir bar If necessary additional distilled or deionized water can be added Verify if the titrant corresponds to selected titration range Insert the dosing tip into the titrant tube sleeve It is critical that the tip be immersed approximately 0 25 cm...

Page 34: ...bration an error message is displayed and the calibration can be restarted by pressing Restart Prepare a new standard rinse electrode temperature probe and dosing tip and try again If the calibration doesn t complete and the max titrant volume of titrant is reached an error message will be displayed The calibration can be restarted by pressing Restart Prepare a new standard rinse electrode tempera...

Page 35: ...35 Pump Calibration Procedure This error message appears when the pump is not working properly Check the tubing valve and syringe Press Restart to try again ...

Page 36: ... air bubbles in the tubing Press Prime then Stop once the volume has been delivered Low Range 50 mL sample High Range 50 mL sample 30 0 to 400 0 mg L as CaCO3 300 to 4000 mg L as CaCO3 0 6 to 8 0 meq L as CaCO3 6 0 to 80 0 meq L as CaCO3 Sample preparation Use a clean pipette to add precisely measured amount of sample to a clean beaker as indicated below Low Range 50 ml 30 0 400 0 mg L as CaCO3 Hi...

Page 37: ...ure that the tip of the electrode is not hitting the stir bar Insert the dosing tip into the titrant tube sleeve It is critical that the tip be immersed approximately 0 25 cm 0 1 into the solution being titrated Press Continue to begin the titration and Stop to abort it The instrument will continuously update the concentration on the display The value will be displayed blinking When the reading is...

Page 38: ...tration value into the instrument s memory A message will be displayed for a few seconds indicating the amount of the free log space Up to 200 log samples can be recorded in the instrument s memory Press Restart to begin a new titration or ESC to return to the titration menu If the concentration exceeds the range limits the exceeded range limit will be displayed blinking Another titration can be s...

Page 39: ... measure and transfer the necessary volume of sample into the titration beaker Calibrate the pump prior to each series of titrations Calibrate the pump if the meter is left idle for several hours Analyze the sample immediately after the sample is obtained For better performance soak the electrode in HI70300 storage solution for at least one hour before use 15 2 VIEW DELETE TITRATOR RECORDED DATA P...

Page 40: ...ce is connected the Export key is displayed It saves the titration curve data as a text file on the storage device using the displayed file name Use the ARROW keys when is displayed to scroll between the log records Press ESC to return to the previous screen Press Plot to visualize the titration curve or ESC to return to the previous screen On the titration curve the endpoint volume and pH are dis...

Page 41: ... record will renumber the list of records If the titrator log is empty the message No Records Available will be displayed 15 3 TITRATOR GLP INFORMATION Press MENU then GLP From this screen it is possible to select Electrode or the Pump GLP Press Pump to view the pump s last calibration time date and slope If a calibration hasn t been performed the message Not Calibrated will be displayed ...

Page 42: ...n Press MENU to access the instrument s menu Press HELP to view the contextual help every time you need additional information Press STIR to start stop the stirrer Press Titrator to enter titration mode Press CAL to access the calibration menu Press LOG to save the current reading A message indicating the free log space will be displayed for a few seconds In order to take pH measurements follow th...

Page 43: ...s desired the temperature probe must be disconnected from the instrument The default temperature of 25 C 77 F or the last temperature reading will be displayed preceded by the symbol and the MTC message The temperature can be adjusted with the ARROW keys from 20 0 to 120 0 C 16 1 VIEW DELETE RECORDED pH DATA Press MENU key while in pH meter screen then Recall to access the meter logs When an exter...

Page 44: ...available will be displayed 16 2 pH METER GLP INFORMATION The pH meter GLP screens displays the pH calibration data To view this information press MENU key while in pH meter mode then GLP Press Electrode to view information regarding electrode calibration The following items are included in electrode GLP the time and date of the last calibration offset slope electrode condition calibration timeout...

Page 45: ...ther analysis on a PC The logged data can also be transferred from the instrument to the PC using a USB cable Connect the USB cable and the following screen will be displayed Press Meter to generate the text file with Meter log data Press Titrator to generate the text file with Titrator log data Press Plot to generate the text files with Titration Plots The generated files are now visible and can ...

Page 46: ...cables The cable used for connection to the instrument must be intact andtheremustbenobrokeninsulationonthecableorcracksontheelectrodestemorbulb Connectors must be perfectly clean and dry If any scratches or cracks are present replace the electrode Rinse off any salt deposits with distilled deionized water pH Cleaning Procedure SoakinHannaInstrumentsHI7061orHI8061Generalcleaningsolutionforapproxim...

Page 47: ... cable connection to meter and verify protective cap is off Check the quality of the sample Clean the electrodes Refill with fresh fill solution The meter does not accept the pH buffer solution for calibration Broken pH electrode Follow the electrode cleaning procedure If the error persists replace the electrode or contact the vendor The pump calibration can t be performed Broken pump tubing Wrong...

Page 48: ...uck Check the keyboard or contact the vendor Error xx message is displayed Internal error Power off the meter and then power it on again If the error persists contact the vendor Stirrer error message is displayed at the end of pump calibration or titration Stirrer not functioning properly If the error persists contact the vendor Non spinning stirrer icon blinking in pH calibration and meter mode S...

Page 49: ... HI70300L Storage solution 500 mL HI80300M Storage solution 230 mL HI80300L Storage solution 500 mL ELECTRODE CLEANING SOLUTION HI7061M Electrode cleaning solution 230 mL HI7061L Electrode cleaning solution 500 mL HI8061M Electrode cleaning solution 230 mL HI8061L Electrode cleaning solution 500 mL OTHER ACCESSORIES HI70501 Tube set with cap for titrant bottle tip and valve HI7100051 8 115 Vac to ...

Page 50: ...d the instrument s safety do not use or store the instrument in hazardous environments WARRANTY HI84531 is warranted for two years against defects in workmanship and materials when used for its intended purpose and maintained according to instructions Electrodes and probes are warranted for a period of six months This warranty is limited to repair or replacement free of charge Damage due to accide...

Page 51: ...Hanna Instruments reserves the right to modify the design construction or appearance of its products without advance notice ...

Page 52: ...World Headquarters Hanna Instruments Inc Highland Industrial Park 584 Park East Drive Woonsocket RI 02895 USA www hannainst com MAN84531 Printed in ROMANIA ...

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