Hanna Instruments HI 84429 Instruction Manual
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Hanna Instruments HI 84429 Instruction Manual

Hanna Instruments HI 84429 Instruction Manual

Titratable acidity minititrator & ph meter for dairy products
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Instruction Manual
HI 84429
TITRATABLE ACIDITY
MINITITRATOR & pH METER
for Dairy Products
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 84429

  • Page 1 Instruction Manual HI 84429 TITRATABLE ACIDITY MINITITRATOR & pH METER for Dairy Products w w w. h a n n a i n s t . c o m...

  • Page 2: Table Of Contents

    ELECTRODE CONDITIONING & MAINTENANCE ..............45 ACCESSORIES ........................46 WARRANTY ........................47 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 3: Preliminary Examination

    PRELIMINARY EXAMINATION Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occured during shipment, please notify your Dealer. Each HI 84429 minititrator is supplied complete with: • FC 260B pH electrode • HI 5315 Reference electrode •...
  • Page 4 Other features: • Log on demand up to 100 samples (50 for pH measurement; 50 for titration results) • GLP feature, to view last calibration data for pH electrode and pump • PC interface MEASUREMENT SIGNIFICANCE Both pH and titratable acidity are used to measure milk acidity. A decrease in pH or increase in titratable acidity indicates lactic fermentation has occurred, most likely due to bacterial activity.
  • Page 5 Taking into account the concentration of sodium hydroxide the result expressed into one unit value can be easily converted into any other unit value according with the chart: °SH °Th °D %l.a. NaOH conc. (N) 0.25 0.111 0.0111 2.25 0.0225 0.009 10/9 0.01...

  • Page 6: Specifications

    SPECIFICATIONS Titrator Range Titratable acidity (low range) °SH: 0.0 to 15.0 °SH °Th: 0 to 40 °Th °D: 0 to 35 °D %I.a.: 0.00 to 0.35 %I.a. Titratable acidity HR (high range) °SH: 10.0 to 75.0 °SH °Th: 20 to 200 °Th °D: 20 to 175 °D %I.a.: 0.0 to 2.0 %I.a.
  • Page 7 Resolution 0.1 °C Accuracy ±0.4 °C without probe error Electrode FC 260B pH electrode (included) HI 5315 reference electrode (included) Temperature Probe HI 7662-T (included) Environment 0 to 50 °C (32 to 122 °F); max 95% RH non-condensing Power supply 220 V/50Hz;...

  • Page 8: Principle Of Operation

    PRINCIPLE OF OPERATION The determination of titratable acidity in dairy products is made according to a neutralization reaction, that is the reaction between the acids found in dairy products and a base. This type of reaction forms the basis of titration methods of analyzing acids. Titratable acidity is measured on a sample by titrating the sample with sodium hydroxide to an endpoint of 8.30 pH.

  • Page 9: Functional Description

    FUNCTIONAL AND PHYSICAL DESCRIPTION FRONT PANEL FRONT PANEL FRONT PANEL FRONT PANEL FRONT PANEL 1. Titrant bottle 3. Keypad 5. Peristaltic pump tubes 2. Graphic LCD 4. Electrode holder REAR PANEL REAR PANEL REAR PANEL REAR PANEL REAR PANEL 6. pH Electrode 11.
  • 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, depending on the context, while pressed in SETUP the new value of the set parameter is not changed. - used to modify a parameter’s value, to scroll the information displayed while viewing a help or to move between the options from the instrument’s setup HELP...

  • Page 11: Titrator Startup

    5) functional key area 6) indicates that the displayed value can be changed using ARROW keys 7) temperature reading display 8) pH temperature compensation mode 9) stirrer and reading status area PERISTALTIC PUMP Peristaltic pumps are self priming. Liquid never contacts the pump components. The titrant tubing is pressed along the rotating rollers of the pump.

  • Page 12: 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 13 Calibration timeout Option: 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 14 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 15 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 16 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 17 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.

  • 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 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

    ELECTRODE CALIBRATION PROCEDURE It is recommended to calibrate the instrument frequently, especially if high accuracy is required. The pH range should be recalibrated: a) Whenever the pH electrode is replaced b) At least once a week c) After testing aggresive chemicals and after electrode is cleaned d) When extreme accuracy is required e) If the pH calibration expired warning is displayed during measurement.
  • Page 20 THREE POINT CALIBRATION • From the pH meter/titrator calibration menu screen select the Electrode calibration option. The electrode calibration screen will be displayed. • The 6.00 buffer will be selected by default. If necessary press the ARROW keys in order to select a different buffer value.
  • Page 21 • When the reading is stable and close to the selected buffer, the (unstable measurement) symbol will disappear and the CFM key will become active. • Press CFM to confirm the calibration. • The calibrated value will be shown on the display and the third expected buffer value will be automatically selected.
  • Page 22 • 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. If the slope is too low the symbol will be displayed. •...

  • Page 23: Ph Buffer Temperature Dependence

    Notes: • To clear a previous calibration and to return to the default value, press Clear at any time after entering calibration mode. The “Calibration cleared” message will be shown for a few seconds on the display. If Clear is invoked during the first calibration point the instrument returns to the measurement mode.

  • Page 24: Pump Tube Replacement

    PUMP TUBE INSTALLATION To mount the new peristaltic pump tube follow next steps: Caution: Purge line with water to remove NaOH from tube. • Position one peristaltic pump fixing ring on its location. • Stretch the tube over the peristaltic pump cylinders. •...
  • Page 25 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.

  • Page 26: Pump Calibration Procedure

    After the 5 minutes purging interval has elapsed the “Completed” message is displayed. Another purge period can be initiated by pressing Restart. PUMP CALIBRATION PROCEDURE The calibration of the pump must be performed each time the pump tube, the reagent bottle or the pH electrode is changed.
  • Page 27 • 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. •...
  • 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 independent of the selected range and concentration unit. •...

  • Page 29: Titration Procedure

    TITRATION PROCEDURE Verify: The instrument has been calibrated (pH and pump) before performing a titration. An electrode calibration in 8.30 pH buffer is recommended. • Refer to Setup Configuration Menu (see page 24) to set up instrument for your measurement. •...
  • Page 30 • From the titrator main screen press Titration. To enter titrator main screen from pH meter mode press Titrator and then Continue. • Press Start to begin the titration process. • 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.
  • Page 31 • If the concentration is out of limits (15 SH for Low Range, 10 or 75 SH for High Range - see pg. 6 for range limits) the exceeded range limit will be displayed blinking and the message “Out of range” will be shown. Another titration can be initiated by pressing Restart. Note: If the end-point is not reached or it is not recognized or the input reading is out of 3.00 to 8.30 pH range, an error message will be displayed.
  • Page 32 The instrument will display a list of all the titration records stored in the titration log. Use the ARROW keys to scroll the stored records list. If the saved concentration was out of range the “!” symbol is displayed in front of the reading. Press Delete to enter record deleting mode.
  • Page 33 If the titrator log is empty the message “No Records!” will be displayed. 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.

  • Page 34: Ph Measurement

    If GLP pump is pressed, one of the next screens is displayed. 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 84429 may be used as a pH meter for direct measurements.
  • Page 35 Press LOG to memorize the current reading. A message indicating the free log space will be displayed for a few seconds. Up to 50 log samples can be saved into the instrument’s memory. When the pH log space is under 12% a message will be permanently shown on the display, indicating the remaining free log space.
  • Page 36 VIEW/DELETE pH MEMORIZED SAMPLES 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 focused record. Press Delete to enter record deleting mode.
  • Page 37 If Delete All was pressed the instrument will ask for confirmation. Press CFM 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 refers to the pH calibration date.

  • 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 bellow.
  • Page 39 the buffer value. • 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: Pc Interface

    Notes: Other cables than HI 920010 may use a diffrent configuration. In this case, communication between instrument and PC may not be possible. If you are not using Hanna Instruments HI 92000 software, please see the following instructions. SENDING COMMANDS FROM PC It is also possible to remotely control the instrument with any terminal program.
  • Page 41 -Meter status (2 chars) represents a 8 bit hexadecimal encoding. -0x10: temperature probe connection -0x01: new GLP data available -0x02: new setup parameter -Reading status (1 char): R-in range, O - over range, U - under range. -pH reading with sign and decimal point (7 chars) -Temperature, with sign and 2 decimals point, always in °C (7 chars).
  • Page 42 -Checksum (2 chars) Requests the setup parameters setting. The answer string contains: -Instrument ID (4 chars) -Calibration alarm time out (2 chars) -Concentration unit (1 char): 0=°SH, 1=°Th, 2= °D, 3=% l.a. -Sample type (1 char): 0=High Range, 1=Range -SETUP information (2 chars): 8 bit hexadecimal encoding -0x01-beep ON (else OFF) -0x04-degree Celsius (else degrees Fahrenheit) -Backlight value (1 char)

  • Page 43: Fuse Replacement

    -02-titrator -Overrage for the measured value: R-in range, O-over range, U-under range. -Measured value (7 chars): for the pH meter log this is the measured pH value; for the titrator log this is the concentration value -Temperature reading, with two decimals point (7 chars) (only for pH meter log) -Calibration offset (7 chars) (only for pH meter log) -Calibration slope (7 chars) (only for pH meter log) -Concentration unit (1 char) (only for titrator log): 0=°SH, 1=°Th, 2=°D, 3=%l.a.

  • Page 44: Troubleshooting Guide

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

  • Page 45: Electrode Conditioning & Maintenance

    r t i ° T ° ° ) t i E " " x i s r ELECTRODE CONDITIONING AND MAINTENANCE STORAGE PROCEDURE To assure a quick response time, the glass bulb 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 46: Accessories

    REFERENCE ELECTRODE CLEANING • Drain the old filling solution, rinse with an adequate HI 7072 solution, drain, then refill with HI 7072 solution. • Do not use an electrode if crystalized salts are visible inside the electrode. Drain electrode, dissasamble and rinse internal body with deionised water.

  • Page 47: Warranty

    If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service Department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection.
  • Page 48 SALES AND TECHNICAL SERVICE CONTACTS SALES AND TECHNICAL SERVICE CONTACTS SALES AND TECHNICAL SERVICE CONTACTS SALES AND TECHNICAL SERVICE CONTACTS SALES AND TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769.0666 • Fax (03) 9769.0699 China: Tel. (10) 88570068 • Fax (10) 88570060 Egypt: Tel.

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