Instruction Manual HI 84431 TOTAL ALKALINITY MINITITRATOR & pH METER for Water Analysis w w w. h a n n a i n s t .
Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.
TABLE OF CONTENTS PRELIMINARY EXAMINATION................................................................................................. 4 GENERAL DESCRIPTION ........................................................................................................ 4 SPECIFICATIONS ................................................................................................................... 7 PRINCIPLE OF OPERATION ........................................................................................
PRELIMINARY EXAMINATION Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occurred during shipment, please notify your Dealer. Each HI 84431 minititrator is supplied complete with: • HI 1131B pH electrode • HI 7662-M Temperature probe • HI 84431-50 Titrant low range (100 mL) • HI 84431-51 Titrant high range (100 mL) • HI 84431-55 Pump calibration solution (100 mL) • HI 70004 pH 4.01 buffer solution (2 x 20 mL) • HI 700083 pH 8.
By simply pressing START key, the HI 84431 automatically starts pump operation and titrates the sample to the end point. The HI 84431 has a simple and accurate peristaltic pump to ensure the best accuracy and repeatability. By performing pump calibration with the Hanna standard provided, the instrument accuracy is assured. The instrument employs a powerful and effective built-in algorithm to analyze the pH response to determine the exact pH endpoint, then uses this to make the necessary calculations.
The results of a titration provide a means to classify the principle forms of alkalinity.
SPECIFICATIONS Titrator pH meter Temperature Electrode Temperature Probe Environment Power supply Dimensions Weight Range Titratable alkalinity (low range) mg/L : 15.0 - 500.0 mg/L as CaCO3 meq/L : 0.3 - 10.0 meq/L as CaCO3 Titratable alkalinity (high range) mg/L : 400 - 4000 mg/L as CaCO3 meq/L : 8 - 80 meq/L as CaCO3 Resolution Titratable alkalinity (low range): 0.1 mg/L 0.
REQUIRED REAGENTS Code HI 84431 - 50 HI 84431 - 51 HI 84431 - 55 Description Titrant (Low Range) Titrant (High Range) Pump Calibration Solution Quantity/Test 1 mL 1 mL 2 mL for low range 20 mL for high range PRINCIPLE OF OPERATION Water alkalinity determination is performed by titration with acid reagent to pH end point. Alkalinity is expressed as: • Strong alkalinity (phenolphtalein alkalinity) determination by titration at 8.
FUNCTIONAL AND PHYSICAL DESCRIPTION OVERHEAD VIEW 1. 2. 3. 4. Titrant bottle Graphic LCD Keypad Dedicated guide tube for Temperature Probe 5. Electrode holder 6. Dedicated guide tube for titrant tip 7. Peristaltic pump tube FRONT VIEW REAR VIEW 8. Temperature probe 9. pH Electrode 10. Beaker 11. BNC electrode connector 12. Temperature probe socket 13. Power switch 14. Power adapter connector 15.
KEYPAD FUNCTION AND INDICATORS - used to leave the current screen and to return either to the previous screen or to the main screen. When pressed while modifying a parameter within the SETUP menu, exits parameter without changing it.
GUIDE TO INDICATORS During the instrument’s operation information is displayed on the LCD. Displayed icons: Pump running. Unstable reading. Stirrer on. Parameter can be changed. 1 9 2 8 3 4 7 5 6 1. Current time and instrument mode information (pH meter or Titrator) 2. pH electrode condition information 3. Main reading information 4. Instrument status information 5. Functional key area 6. Indicates that the displayed value can be changed using ARROW keys 7. Temperature value (°C, °F) 8.
TITRATOR STARTUP This is a general outline of the steps required to make a titration. The following sections expand upon each section. • Place the instrument on a flat table. Do not place the instrument in direct sun light. • Connect the power adapter to the instrument. • Turn the instrument ON using the power switch from the rear panel of the instrument. • Set up the instrument. See the “Setup Configuration Menu” section for details. • Connect the pH sensor and temperature probe to the instrument.
SETUP CONFIGURATION MENU The titrator’s setup configuration menu may be accessed from the pH or titration screens by pressing the MENU key, then Setup. A list of setup parameters will be displayed with currently configured setting. While in the setup menu it is possible to modify the instrument’s operation parameters. The ARROW keys permit the user to scroll the setup parameters. Press HELP to view the contextual help. Press ESC to return to the main screen. Concentration unit Options: mg/L, meq/L.
Calibration timeout Options: Disabled or 1 to 7 days. This option is used to set the number of days before the pH calibration expired warning message is flagged. Press Modify to access the calibration timeout value modify parameter. Use the ARROW keys in order to increase/decrease the value. Press Accept to confirm or ESC to return to the setup menu without saving the new value. pH resolution Options: 0.1, 0.01. Press the displayed function key in order to change the pH resolution.
/ in order to Use the ARROW keys or increase/decrease the displayed constrast. Press Accept to confirm or ESC to return to the setup menu. Contrast Option: 0 to 20. This option is used to set the display’s contrast. Press Modify to change the display’s contrast. / in order to Use the ARROW keys or increase/decrease the value. Press Accept to confirm the value or ESC to return to the setup menu. Date / Time This option is used to set the instrument’s date and time. Press Modify to change the date/time.
Time format Option: AM/PM or 24 hours. Press the functional key to select the new value. Date format Press Modify to change the Date Format. Use the ARROW keys to select the desired format. Press Accept to confirm the value or ESC to return to the setup menu. Language Press the corresponding function key to change the language. If the new selected language cannot be loaded, the previously selected language will be reloaded.
Beep On Press the function key to select the new option. When enabled, a short beep is heard every time a key is pressed or when the calibration can be confirmed. A long beep alert sounds when the pressed key is not active or a wrong condition is detected while in calibration. Meter information Press Select to view the firmware version, language version, mV factory calibration date and time and temperature factory calibration date and time. Press ESC to return to the Setup mode.
ELECTRODE PREPARATION PREPARATION PROCEDURE Remove the electrode protective cap. DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is normal with electrodes and they will disappear when rinsed with distilled 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.
ELECTRODE CALIBRATION PROCEDURE It is recommended to calibrate the instrument frequently, especially if high accuracy is required. The pH electrode should be recalibrated: a) Whenever the pH electrode is replaced b) At least once a week c) After testing aggressive chemicals and after electrode is cleaned d) When high accuracy is required e) If the pH calibration expired warning is displayed during measurement.
• The (unstable measurement) symbol will be shown on the display until the reading becomes stable. • 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. • Press ESC to exit calibration. Notes: • To clear a previous calibration and to return to the default value, press Clear at any time after entering calibration mode.
• After the second calibration point has been confirmed, press ESC to exit without performing the third calibration point. Point 3 calibration • Remove the electrode holder with electrodes from the top of the beaker. • Place the third buffer solution in a beaker and place in beaker holder. Rinse the probes in a beaker with third buffer rinsing solution. • Place the electrode holder (with electrode) in the beaker with third buffer and secure top by locking.
• If the measured offset isn’t within the preset limits the meter will display the message “Buffer Contaminated” alternatively with ”Electrode Dirty/Broken”. • If the computed slope isn’t within the preset limits the meter will display the message will be displayed. If the “Wrong Slope”. If the slope is too high the symbol will be displayed. slope is too low the symbol • If the “Wrong Old Slope” error message is displayed, an inconsistency exists between the current and the previous (old) calibration.
pH BUFFER TEMPERATURE DEPENDENCE The temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes to a lesser degree than normal solutions. During calibration the instrument will automatically calibrate to the pH value corresponding to the measured or set temperature. During calibration the instrument will display the pH buffer value at 25 °C. TEMP pH BUFFERS °C °F 4. 01 8. 30 10. 01 0 32 4.01 8.48 10.32 5 41 4.00 8.44 10.24 10 50 4.00 8.41 10.
PUMP TUBE INSTALLATION To mount the new peristaltic pump tube follow next steps: • Position one peristaltic pump fixing ring on its location. • Stretch the tube over the peristaltic pump rolls. • Fix the second pump fixing ring on its location. • Determine which titrant is required for the expected alkalinity range selected (see table in Alkalinity Type). • Attach the tube to the reagent bottle.
- a pump calibration hasn’t been performed or more than 3 days have passed since the last pump calibration. • Press CAL to access the titration calibration menu where electrode and pump calibration may be accessed. • Press HELP to view the contextual help. • Press Continue or ESC to skip the message and enter Titrator main screen. • Press Purge to begin a purge cycle. The purging stops automatically after 5 minutes. To stop purging at any time and return to the main screen press ESC or Stop.
After the 5 minutes purging interval has elapsed the “Completed” message is displayed. Another purge period can be initiated by pressing Restart or press ESC to return to main titrator screen. PUMP CALIBRATION PROCEDURE SETUP alkalinity type and purge unit with titrant before performing the pump calibration. • Select the corresponding range according to the table below. U NI T Low Range (50 m L sam ple) High Range (50 m L sam ple) m g/L 10.0 to 500.0 400 to 4000 m eq/L 0.2 to 10.
• Insert the dosing tip in the appropriate guide tube holder place and insert it in the solution. Note: The chemical reagents may be hazardous if improperly handled. Read the Material Safety Data Sheets (MSDS) before performing the test. • From the titrator main screen press CAL. The instrument displays the date and time of the last electrode calibration, and the date and time of the last pump calibration, or calibration expired messages. • Press Pump. The next screen will be displayed. • Press Start.
• After the pump calibration is complete a confirmation message is displayed for a few seconds, then the instrument will return to the titrator calibration menu and will display the new time and date for the last pump calibration. Notes:• The calibration of the pump is dependent on alkalinity range selected during SETUP. • If an erroneous situation is encountered during the calibration, an error message is displayed and the calibration can be restarted by pressing Restart.
TITRATION PROCEDURE Verify: The instrument has been calibrated (pH and pump) before performing a lot of titrations. An electrode calibration in at least one point (8.30 pH buffer) is recommended. • Refer to Setup Configuration Menu (see the “Setup” section) to set up instrument for your measurement. • Sample preparation: For all measurement samples fill a beaker up to the 50 mL mark with sample. Place the stir bar into the beaker and then place the beaker in the appropriate place on the instrument top.
• After the titration is started on the upper right side of the display two animations will be shown in order to indicate that the pump and the stirrer are running. On the lower right side of the display is shown the period of time since the titration has been started. • After the titration is complete, the concentration value is displayed in the selected unit. • Press Unit to change the display unit. • Press LOG to record the concentration value into the instrument’s memory.
• Prepare a fresh sample and place on titrator. Place the temperature probe and the electrode in appropriate guides. • Immerse the titrant tip and use care not to dislodge titrant from dispensing tip. Note: If the end-point is not reached or it is not recognized or the input reading is out of range, an error message will be displayed. The titration can be restarted after a new sample is prepared by pressing Restart. TIPS FOR AN ACCURATE MEASUREMENT • Calibrate the instrument in 8.
Press Delete to enter delete record screen. Press Delete All to enter delete all records screen. Press More to view additional information of the measurement. Press Unit to convert the result between meq/L and mg/L. Press ESC to return to the previous screen. Use the ARROW keys when is displayed to scroll between the log records. If Delete was pressed the instrument will ask for confirmation. Use the ARROW keys to focus on the record to be deleted.
TITRATOR GLP INFORMATION Press MENU while in Titration mode and then GLP. From this screen it is possible to select between viewing the electrode GLP or the pump GLP. Press GLP elec. to view the electrode’s last calibration parameters and date. Press GLP pump to view the pump’s last calibration time and date. If GLP elec. is pressed one of the next screens will be displayed. GLP contains a set of information regarding electrode calibration.
The pump GLP displays the Time and Date of the last pump calibration. If a calibration hasn’t been performed the message “Not Calibrated” will be displayed. pH MEASUREMENT The HI 84431 may 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. At power up the instrument enters pH meter mode. From titrator mode press ESC until pH units are displayed.
Press LOG to memorize 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 pH bulb 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 readings are less than -2.00 or greater than 16.00 pH the closest full-scale value (-2.
VIEW OR DELETE PREVIOUSLY LOGGED RECORDS Press MENU key while in pH meter screen. Press Recall to access the pH recall. A list of records is stored in the pH log. Use the ARROW keys to scroll the list of records. Press More to see detailed information about the highlighted record. Press Delete to enter record deleting mode. Press Delete All to enter all records deleting mode. If More is pressed a complete set of data is displayed. Use ARROW keys when is displayed to scroll between the records.
If Delete All was pressed the instrument will ask for confirmation. Press Confirm to delete all records or ESC to return to the previous screen without deleting. If the pH log is empty the message “No Records!” will be displayed. pH METER GLP INFORMATION The pH meter GLP information references the last pH calibration data. To view this information press MENU key while in pH meter mode then GLP. A set of information regarding electrode calibration is displayed.
TEMPERATURE CALIBRATION PROCEDURE (for technical personnel only) All the instruments are factory calibrated for temperature. HANNA’s temperature probes are interchangeable and no temperature calibration is needed when they are replaced. If the temperature measurements are inaccurate, temperature recalibration should be performed. For an accurate recalibration, contact your dealer or the nearest HANNA Customer Service Center, or follow the instructions below.
• Immerse the temperature probe in the second vessel as near as possible to the reference thermometer. Allow a few seconds for the probe to stabilize. • Use the ARROW keys to set the calibration point value to that of the hot water, measured by the reference thermometer. • The (unstable measurement) symbol will be shown on the display until the reading becomes stable.
TROUBLESHOOTING GUIDE SYMPTO MS PRO BLEM SO LU TI O N Slow resp onse/excessive d rift. D irty p H electrod e. S oa k t h e e l e c t rod e t i p HI 7061 clea ning solu tion for 30 minu tes. Refill with fill solu tion. Rea d ing flu ctu a tes u p a nd d own (noise). Clog g ed /d irty ju nction. L ow electrolyte level (refilla b le p H electrod es only). Ca b le connection. Clea n the electrod es. Refill with fresh fill solu tion.
SYMPTO MS PRO BLEM SO LU TI O N After a titra tion in High Range th e in stru m en t d isp la ys 4000 m g /L or 800 m eq (a ccord in g with th e selected u n it) b lin kin g . Broken electrod es. In stru m en t n ot ca lib ra ted . Wron g sa m p le. Con cen tra tion ou t of ra n g e. Ch eck/clea n th e electrod es. Reca lib ra te th e in stru m en t (p u m p a n d p H). Use ca re d u rin g sa m p le p rep a ra tion . At sta rtu p th e m eter d isp la ys th e HANNA log o p erm a n en tly.
ACCESSORIES REAGENTS HI 84431-50 HI 84431-51 HI 84431-55 HI 84431-70 HI 84431-71 HI 84431-72 Titrant solution for low range (100mL) Titrant solution for high range (100mL) Pump calibration solution (100mL) Reagents kit for low and high range (about 150 titrations) Reagents kit for low range (about 150 titrations) Reagents kit for high range (about 150 titrations) pH CALIBRATION SOLUTIONS HI 7004M Buffer solution pH 4.01 (230mL) HI 70083M Buffer solution pH 8.30 (230mL) HI 7010M Buffer solution pH 10.
WARRANTY HI 84431 is warranteed for two years against defects in workmanship and materials when used for its intended purpose and maintained according to the instructions. This warranty is limited to repair or replacement free of charge. Damage due to accident, misuse, tampering or lack of prescribed maintenance is not covered. If service is required, contact your dealer. If under warranty, report the model number, date of purchase, serial number and the nature of the failure.
Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Local Sales and Customer Service office Hanna Instruments United States Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Tel. (800) 426 6287 Fax (401) 765 7575 www.hannainst.com/usa Technical Support for customers Telephone (800) 426 6287 Fax (401) 765 7575 E-mail tech@hannainst.
