Hanna Instruments HI 84431 Instruction Manual
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Hanna Instruments HI 84431 Instruction Manual

Hanna Instruments HI 84431 Instruction Manual

Total alkalinity minititrator & ph meter for water analysis
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Instruction Manual
HI 84431
TOTAL ALKALINITY
MINITITRATOR & pH METER
for Water Analysis
w w w. h a n n a i n s t . c o m
1

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Summary of Contents for Hanna Instruments HI 84431

  • Page 1 Instruction Manual HI 84431 TOTAL ALKALINITY MINITITRATOR & pH METER for Water Analysis w w w. h a n n a i n s t . c o m...
  • Page 2 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.

  • Page 3: Table Of Contents

    ELECTRODE CONDITIONING & MAINTENANCE ..............41 ACCESSORIES ........................42 WARRANTY ........................43 All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.

  • Page 4: Preliminary Examination

    Any defective item must be returned in its original packing. GENERAL DESCRIPTION The HI 84431 is an easy to use microprocessor-based automatic minititrator and pH meter designed for the rapid and accurate analysis of Total Titratable alkalinity in water. By eliminating subjective factors including color indicators, errors in mathematical calculations or erratic titrant additions from the measurement, the HI 84431 makes Total Titratable alkalinity analysis precisely.
  • Page 5 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.
  • Page 6 Potentiometric end point detection using a pH electrode is more objective than using visual end point determinations with color changing indicators. The HI 84431 minititrator is a potentiometric titrator. The instrument also can be used as a pH meter. The volume of titrant dispensed necessary...

  • Page 7: Specifications

    SPECIFICATIONS Titrator Range Titratable alkalinity (low range) mg/L : 15.0 - 500.0 mg/L as CaCO meq/L : 0.3 - 10.0 meq/L as CaCO Titratable alkalinity (high range) mg/L : 400 - 4000 mg/L as CaCO meq/L : 8 - 80 meq/L as CaCO Resolution Titratable alkalinity (low range): 0.1 mg/L...

  • Page 8: Principle Of Operation

    HI 84431-55 is used for pump calibration; the volume used will vary for the selected range. Titratable Alkalinity in waters, as performed on the HI 84431 minititrator, utilizes a simple sample preparation, a high quality peristaltic dosing pump for titrant, potentiometric endpoint detector and instantaneaous computations.

  • Page 9: Functional And Physical Description

    FUNCTIONAL AND PHYSICAL DESCRIPTION OVERHEAD VIEW OVERHEAD VIEW OVERHEAD VIEW OVERHEAD VIEW OVERHEAD VIEW 1. Titrant bottle 2. Graphic LCD 3. Keypad 4. Dedicated guide tube for Temperature Probe 5. Electrode holder 6. Dedicated guide tube for titrant tip 7. Peristaltic pump tube FRONT VIEW FRONT VIEW FRONT VIEW...
  • Page 10 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. - used to modify the parameters’ values, to scroll the information displayed while viewing a help or to move between the options from the instrument’s SETUP HELP - used to access/leave the instrument’s contextual help...
  • Page 11 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. Current time and instrument mode information (pH meter or Titrator) 2. pH electrode condition information 3.

  • Page 12: Titrator Startup

    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. •...

  • Page 13: Setup Configuration Menu

    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.
  • Page 14 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.
  • Page 15 Use the ARROW keys or in order to 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. Use the ARROW keys or in order to increase/decrease the value.
  • Page 16 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.
  • Page 17 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.

  • Page 18: Electrode Preparation

    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.

  • Page 19: Electrode Calibration Procedure

    4.01, 8.30 and 10.01 pH. For a single point calibration any of the three buffers may be used, but using 8.30 pH is recommended. Note: The HI 84431 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.
  • Page 20 • 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. •...
  • Page 21 • 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.
  • Page 22 • 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 “Wrong Slope”. If the slope is too high the symbol will be displayed.

  • Page 23: Ph Buffer Temperature Dependence

    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.

  • Page 24: Pump Tube Installation

    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. •...
  • Page 25 - 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. •...

  • Page 26: Pump Calibration Procedure

    • Verify if the titrant correspondes to selected titration range. For Low Range (Strong LR, Total LR) use the HI 84431-50. For High Range (Strong HR, Total HR) use the HI 84431-51.
  • Page 27 • 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.
  • Page 28 • 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. •...

  • Page 29: Titration Procedure

    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.
  • Page 30 • 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. •...
  • Page 31 • 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.
  • Page 32 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.
  • Page 33 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.

  • Page 34: Ph Measurement

    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.
  • Page 35 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.
  • Page 36 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.
  • Page 37 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.

  • Page 38: Temperature Calibration Procedure (For Technical Personnel Only)

    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.
  • Page 39 • 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.

  • Page 40: Troubleshooting Guide

    TROUBLESHOOTING GUIDE i s s y t r r t c . t f r o f l l i l l i o i t y t r o r t l l i o i t e r f l l i o i t o r t...

  • Page 41: Electrode Conditioning & Maintenance

    r t i E " " x ELECTRODE CONDITIONING AND MAINTENANCE STORAGE PROCEDURE To assure a quick response time, the glass bulb should be kept moist and not allowed to dry out. Replace the solution in the protective cap with a few drops of HI 70300 or HI 80300 Storage Solution.

  • Page 42: Accessories

    ACCESSORIES REAGENTS HI 84431-50 Titrant solution for low range (100mL) HI 84431-51 Titrant solution for high range (100mL) HI 84431-55 Pump calibration solution (100mL) HI 84431-70 Reagents kit for low and high range (about 150 titrations) HI 84431-71 Reagents kit for low range (about 150 titrations)

  • Page 43: Warranty

    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.
  • Page 44 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...

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