Instruction Manual
HI 84502
TITRABLE TOTAL ACIDITY
MINITITRATOR
for wine analysis
www.hannainst.com
1
Dear Customer,
Thank you for choosing a Hanna 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.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION................................................................................................. 3
GENERAL DESCRIPTION ........................................................................................................ 4
SPECIFICATIONS ................................................................................................................... 6
PRINCIPLE OF OPERATION .................................................................................................... 7
FUNCTIONAL DESCRIPTION................................................................................................... 8
TITRATOR STARTUP ........................................................................................................... 10
SETUP MENU .................................................................................................................... 11
GUIDE TO DISPLAY CODES ................................................................................................... 15
ELECTRODE PREPARATION .................................................................................................. 18
ELECTRODE CALIBRATION PROCEDURE ................................................................................. 19
pH BUFFER TEMPERATURE DEPENDENCE............................................................................ 23
DOSING PUMP INSTALLATION ............................................................................................. 24
DOSING PUMP PRIME PROCEDURE ..................................................................................... 24
PUMP CALIBRATION PROCEDURE ........................................................................................ 26
TITRATION PROCEDURE ..................................................................................................... 28
pH MEASUREMENT ............................................................................................................ 33
PC INTERFACE AND DATA TRANSFER ................................................................................... 37
TROUBLESHOOTING GUIDE ................................................................................................ 38
ELECTRODE CONDITIONING AND MAINTENANCE .................................................................. 40
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.
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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 84502 minititrator is supplied complete with:
• HI 84502-70 Reagent kit for Titrable Acidity in wine
• HI 1048B pH electrode
• HI 7662-T Temperature probe
• HI 7082 Electrode Fill Solution (30 mL)
• 2000 µL automatic pipette with two plastic tips
• Two 100 mL beakers
• Tube set (aspiration tube with titrant bottle cap and dispensing tube with tip)
• Dosing Pump Valve
• 5 mL Syringe
• 1 mL Plastic Pipette
• Stir bar
• Power Adapter
• Two sachets of cleaning solution for wine deposits
• Two sachets of cleaning solution for wine stains
• Instruction manual
Note:Save all packing material until you are sure that the instrument works correctly.
Any defective item must be returned in its original packing.
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GENERAL DESCRIPTION
The HI 84502 is a low-cost, easy to use, microprocessor-based automatic titrator that benefits from
Hanna’s years of experience as manufacturer of analytical instruments.
The instrument incorporates a simple and reliable dosing pump which ensures high dosing
reproducibility. Pump calibrations, performed with the provided Hanna reagents, assure the accuracy
of the instrument.
The instrument comes with a preprogrammed method for Total Titratable Acidity measurements in
wine.
The HI 84502 performs the analysis and all the necessary calculations, with a simple and effective
user interface.
By simply pressing the Start key in Titrator mode, the instrument will automatically titrate the
sample to the end point. The current pH and temperature are continuously displayed during titration
process. The result is immediately displayed in g/L, then the instrument 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
• Graphic mode to display the titration data
• 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 mV/pH measurements; 200 for
titration results)
• GLP feature, to view calibration data for pH electrode and pump
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SIGNIFICANCE OF USE
Acids occur naturally during the growing of grapes and as part of the fermentation process. Wines
show lower levels of acid when there are hot growing seasons or when the grapes come from hotter
regions. In the proper proportion, acids are a desirable trait and give the wine character.
The three predominant acids in wine are tartaric, malic and citric, all of which are intrinsic to the
grape. Tartaric acid is the principal acid in grapes and is a component that promotes a crisp flavor and
graceful aging in wine. A moderate amount of a wine’s acid comes from malic acid, which contributes
to fruitiness, and a small amount comes from citric acid. Wine also contains trace amounts of other
acids. The least desirable acid in wine is acetic acid, which, when present in more than a nominal
amount, gives wine a sour or vinegary aspect.
Total acidity, also called titratable acidity, is the sum of the fixed and volatile acids. In the United
States the total acidity is usually expressed in terms of tartaric acid, even though the other acids are
measured.
Total Acidity directly affects the color and flavor of wine and, depending on the style of the wine, is
sought in a perfect balance with the sweet and bitter sensations of other components. Too much
acidity makes wine tart and sharp; too little makes wines flat, flabby and uninteresting. Proper
acidity in wine is what makes it refreshing and an ideal accompaniment to food.
The proper acid level of a wine varies, with sweeter wines generally requiring somewhat higher
levels to retain the proper balance. For dry table wine the acceptable range is usually 6.0 to
7.5 g/L; for sweet wine it’s 7.0 to 8.5 g/L.
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SPECIFICATIONS
Titrator Range Low Range: 0.1 to 5.0 g/L of tartaric acid
High Range: 4.0 to 25.0 g/L of tartaric acid
Resolution 0.1 g/L
Accuracy 3 % of reading or ± 0.1 g/L @ 25 °C whichever is greater
Sample volume 10 mL (Low Range) / 2 mL (High Range)
Titration method Acid-base titration
Principle End point titration: 7.00 pH or 8.20 pH
Pump speed 10 mL/min
Stirring speed 600 rpm
Log data Up to 200 samples
pH meter pH meter -2.0 to 16.0 pH / -2.00 to 16.00 pH
pH Resolution 0.1 pH / 0.01 pH
pH Accuracy ± 0.01 pH
pH Calibration 1, 2 or 3 calibration points;
4 available buffers (4.01, 7.01, 8.20, 10.01)
Temperature Manual or automatic
Compensation
mV meter mV meter -2000.0 to 2000.0 mV
mV Resolution 0.1 mV
mV Accuracy ± 1.0 mV
Log data Up to 200 samples (pH or mV)
Temperature Range -20.0 to 120.0 °C (-4.0 to 248.0 °F)
Resolution 0.1 °C
Accuracy ±0.4 °C without probe error
Electrode HI 1048B
Temperature Probe HI 7662-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.)
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REQUIRED REAGENTS
Code Description
HI 84502-50 Titrant
HI 84502-55 Calibration Standard
PRINCIPLE OF OPERATION
The determination of total acids in wine is made according to a neutralization reaction, that is the
reaction between the acids found in wine and a base.
Titratable acidity is measured on a degassed sample at the end-point of 8.20. The results are
expressed as g/L tartaric acid.
For precise results it is very important to know the sample volume, titrant volume and concentration.
The dosing pump reproducibility is independent of the titrant tubing, therefore it doesn’t need
frequent calibrations. The calibration of the pump is necessary in order to have high accuracy for the
titrations.
The calibration procedure is based on the analysis of a known solution. By doing this, the instrument
makes a differential analysis between the standard and the wine sample. The minititrator will
calculate the concentration of the titrant based on the amount needed to reach the end point.
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FUNCTIONAL DESCRIPTION
OVERHEAD VIEW
1) Titrant bottle
2) Liquid Crystal Display (LCD)
3) Keypad
4) Electrode holder
5) Dispensing tube
REAR VIEW
6) Temperature probe
7) pH Electrode
8) Beaker
9) Dosing pump
10) Power switch
11) Power adapter
12) USB connector (PC interface)
13) USB connector (Storage interface)
14) Temperature connector
15) BNC electrode connector
16) Reference connector
17) Titrant bottle
18) Syringe
19) Aspiration tube
20) Dosing Pump Valve
FRONT VIEW
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KEYPAD FUNCTION
ESC - used to leave the current screen and to return either to the previous screen or to the
main screen. In Setup menu, exits a parameter without changing the value.
/ - used to modify the parameter values, to scroll the information displayed while
viewing a help screen or to move between the options from the instrument’s Setup menu
CAL - used to access the Electrode and Pump calibration options
HELP - used to access/exit the instrument’s contextual help
LOG - used to save the current mV/pH reading in pH meter mode and the titration result
MENU - used to enter Setup, Recall or GLP selection menu, while instrument is in pH or
Titration mode
STIR - used to start/stop the stirrer
Note: The stirrer starts automatically during pump calibration and titration, it cannot
be stopped by pressing STIR key.
GUIDE TO INDICATORS
During the instrument’s operation information is displayed on the LCD.
Displayed icons:
Unstable reading.Stirrer on. Pump running.
Parameter can be modified.Stirrer is not working properly.
1) Current time and instrument mode information (pH meter or Titrator)
2) pH electrode condition
3) Instrument status
4) Virtual option keys
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5) Stirrer and reading status
6) Main reading information
7) pH temperature compensation mode (Manual or Automatic)
8) Temperature reading
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 ensure the highest possible accuracy. Before a set of titrations, it is necessary to prime the
dosing system.
Note: Once titrations have been completed, the dosing system should be cleaned with deionized
water using the prime feature.
TITRATOR STARTUP
This is a general outline of the steps required to perform a titration. The following topics are
expanded upon in each section that follows.
• 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 Menu” section for details.
• Connect the pH electrode to the instrument.
• Connect the 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.
• Prime the syringe. To assure high accuracy, verify there are no air bubbles in the syringe or
tubing.
• Calibrate the pump.
• Prepare the sample.
Note: Different volumes of wine are required based on the concentration. See “Titration
Procedure” for details.
• Run a titration and log sample results.
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SETUP MENU
The titrator’s setup menu may be accessed from the main screen (meter or titrator) 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.
Range Setup
Use Low measurement range for 0.1 - 5.0 g/L.
Use High measurement range for 4.0 - 25.0 g/L.
To ensure a high accuracy, it is recommended to
recalibrate the pump after the valve, titrant or
electrode has been changed.
Calibration Timeout
Disabled or 1 to 7 days.
This option is used to 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 end point
pH Resolution
7.00 or 8.20.
Press the displayed virtual option key to change the
option.
0.1 or 0.01.
Press the displayed virtual option key to change the
option.
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Temperature Unit
Time
Date
°C, °F or K.
Press the virtual option key to change the option.
Press the Modify key to change the time and time
format.
Press Format to switch between 12 hour (am/pm)
and 24 hour mode.
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.
Press the Modify key to change the date and date
format.
Key Beep
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.
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.
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Error Beep
Decimal Separator
LCD Contrast
Select Enable to activate or Disable to deactivate
the Error Beep function.
If enabled, a beep will be heard when an error
condition occurs.
This option allows the user to select the symbol
used for a decimal separator.
This option is used to set the display’s contrast.
Press Modify to change the display’s contrast.
The default value is 8.
Use 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.
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Language
Tutorial
Meter Information
Press the corresponding virtual option key to change
the language.
If the selected language cannot be loaded, the
previously selected language will be reloaded.
If no language can be loaded at startup the instrument
will work in “safe mode”. In “safe mode” all
messages are displayed in English. Tutorial and
help information are not available.
Enable or Disable the Tutorial. This helpful tool
offers additional information during calibration and
titration.
Press Select to view the firmware version, language
version, mV factory calibration date and time,
temperature factory calibration date and time,
method version.
Restore Factory Settings
Press ESC to return to the setup menu.
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.
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GUIDE TO DISPLAY CODES
This screen appears when the instrument is turned
on during the initialization process.
Titration screen display.
Titration 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.
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PUMP CALIBRATION MESSAGES
Pump calibration is initiated by pressing the Start
key.
This screen appears while pump calibration is in
progress. Press ESC or Stop key to return to the
Pump Calibration screen.
This error message appears during pump calibration
when the end point can not be reached and the
maximum 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 again.
This error message appears when the pump is not
working properly. Check the tubing, valve and syringe.
Press Restart to try again.
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pH CALIBRATION MESSAGES
TITRATION MESSAGES
pH calibration mode.
When the reading has stabilized press Confirm to
accept 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.
This screen is displayed when the instrument is in
titration mode. Press Start to begin a titration, Meter
to enter pH meter mode or Prime to enter into the
prime function.
The titration result, expressed as concentration of
tartaric acid in g/L (ppt), is displayed automatically
at the end of the titration. Press Restart to start another
titration or ESC to return to the main screen.
This error message appears when the input reading
(pH or temperature) exceeds the input limits. If the
pH or temperature values are blinking they are out
of range.
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ELECTRODE PREPARATION
PREPARATION PROCEDURE
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.
Press Restart to try again.
This error message appears when the pump is not
working properly. Check the tubing, valve and syringe.
Press Restart to try again.
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/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 HI 70300 Storage Solution for at least one hour.
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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, but daily is advised
c) After testing aggressive chemicals and after the electrode is cleaned
d) When high accuracy is required
e) If the pH calibration expired warning is displayed during measurement
Every time you calibrate the instrument use fresh buffers and clean the electrode (see page 40).
PROCEDURE
A single one, two or three-point calibration can be performed, using four predefined buffers
4.01, 7.01, 8.20 and 10.01 pH. For a single point calibration any of the four buffers may be
used. If the 7.00 pH end point is set the 7.01 pH calibration point is recommended, or else
use 8.20 pH.
Note: The HI 84502 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 cap and rinse the electrode with some of the buffer solution to be used
for the first calibration point.
• Put the first beaker with calibration buffer in the beaker holder.
• Place the electrode holder on the top of the beaker and secure it by turning clockwise and
press STIR.
• Immerse the pH and the temperature probe approximately 2 cm (0.8”) into the buffer,
paying attention not to touch the stir bar.
To enter Electrode Calibration follow the next steps:
• Press CAL key then Electrode.
• The electrode calibration screen will be displayed.
• Press Clear to delete the previous calibration.
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Point 1 calibration
• The default buffer selected will be 7.01 if end point was set to 7.00 pH or else 8.20 pH will
be selected. If necessary, press the ARROW keys in order to select a different buffer value.
• 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 or ESC to exit calibration.
• After the first calibration point has been confirmed, press ESC to exit without performing the
second calibration point.
Point 2 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) on the top of the beaker and secure it by turning
clockwise and press STIR.
• If necessary, press the ARROW keys in order to select a different buffer value.
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• 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.
• The calibrated value will be shown on the display and the third expected buffer value will be
automatically selected.
• 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 beaker with calibration buffer in the beaker holder. Rinse the electrodes in a
beaker containing the third buffer rinsing solution.
• Place the electrode holder (with electrodes) on the top of the beaker and secure it by turning
clockwise and press STIR.
• If necessary press the ARROW keys in order to select a different buffer value.
• 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. The instrument stores the calibration value and
returns to calibration menu, where the date and time for the pH calibration will be updated.
Notes:
• A buffer confirmed during the calibration process is removed from the list of available buffers.
• If the value measured by the instrument is not close to the selected buffer, a “Wrong Buffer”
error message will be shown on the display.
Check if the correct buffer has been used or regenerate the pH electrodes by following the
Cleaning Procedure (see page 40). If necessary change the buffer or the electrode.
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• If the measured offset isn’t within the preset limits (±45 mV), 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. If the slope is
too low the symbol will be displayed.
• If the “Wrong Old Slope” error message is displayed, an inconsistency exists between the
current and the previous (old) calibration. Clear the previous calibration by pressing Clear and
proceed with calibration from the 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.
22
Note: • To clear a previous calibration and to return to the default value, press Clear at any
PMET SREFFUBHp
C° F° 10.4 10.7 02.8 10.01
0 23 10.4 31.7 83.8 23.01
5 14 00.4 01.7 43.8 42.01
01 05 00.4 70.7 13.8 81.01
51 95 00.4 40.7 72.8 21.01
02 86 00.4 30.7 32.8 60.01
52 77 10.4 10.7 02.8 10.01
03 68 20.4 00.7 71.8 69.9
53 59 30.4 99.6 41.8 29.9
04 401 40.4 89.6 11.8 88.9
54 311 50.4 89.6 80.8 58.9
time after entering calibration mode. If Clear is invoked during the first calibration
point the instrument returns to the measurement mode.
• The Clear key is displayed only if a previous calibration exists.
pH BUFFER TEMPERATURE DEPENDENCE
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 ºC.
23
DOSING PUMP INSTALLATION
To install the dosing pump follow the procedure below:
• Extend the plunger on the 5 mL syringe to its maximum volume.
• Place the syringe in the dedicated spot on the top of the meter (1).
• Arrange the bottom of the syringe into the holder on the pump (2). Once the syringe is in place
lower the barrel until it sits flush on the holder.
• Put the o-ring and syringe-fixing nut over the syringe (3) and turn clockwise to secure it in place (4).
• Place the valve on the top of the syringe (5). Ensure it fits securely.
• Insert the aspiration tube into the left side of the valve (6) and replace the titrant bottle cap with
the attached cap (7).
• Insert the dispensing tube into the top of the valve (8).
DOSING PUMP PRIME PROCEDURE
Prime cycle should be performed:
• if you notice there is no titrant in the tip
• whenever the dosing system tubes are replaced
• whenever a new bottle of titrant is used
• before starting a pump calibration
• before starting a series of titrations
The prime cycle is used to fill the syringe before starting a set of titrations.
Two rinse cycles of the 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.
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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 and keys and press Start.
• The number of syringe rinses can be set between 1 and 5 (at least three rinses are recommended
to ensure that the air bubbles are completely removed).
• To pause the prime process press the Pause key; to continue press the Continue key. To stop the
prime process press the Stop key.
Note: This error message appears when the pump is not working properly. Check the tubing, valve
and syringe. Press Restart to try again.
25
PUMP CALIBRATION PROCEDURE
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The calibration of the pump must be performed every time the syringe, pump tube, the titrant
bottle or the pH electrode is changed. It is recommended to perform the pump calibration before
each set of titration or after the titrator is left idle for several hours.
• Press MENU, select Setup and select the corresponding range according to the table below:
• Verify the electrode has been calibrated in 8.20 pH buffer or in 7.01 pH buffer.
Sample preparation: Use a clean tip and 2000 uL automatic pipette to precisely add the
appropriate amount of HI 84502-55 Calibration Standard to a clean beaker as indicated below:
Low Range - 4 mL
High Range - 4 mL
Note: Failure to use a clean pipette will result in erroneous
readings.
• Fill the beaker up to the 50 mL mark with the distilled or
deionized water.
• Press CAL key. The instrument displays the date and time of
the last electrode calibration, and the last pump calibration.
• Press Pump key.
Note: DO NOT PLACE THE TIP INTO THE CALIBRATION
BEAKER, PLACE THE TIP OVER A WASTE BEAKER.
A SMALL AMOUNT OF TITRANT IS DISPENSED
WHEN THE PUMP RESETS.
• Press Start, wait for the syringe to refill.
• Place the stir bar in the beaker and put the beaker in the
minititrator top.
• Place the probe holder on the top of the beaker and secure it
by turning clockwise.
• Rinse the pH electrode with deionized water and immerse
into the sample until the PTFE 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.
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• 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 calibration and Stop to abort it.
• At the end of the calibration, ”Calibration Completed“
appears on display. To repeat the calibration press Restart or
ESC to return to the main screen.
Note: • If temperature probe is not connected, Manual Temperature Compensation is used
and MTC appears on the right side of the screen. If Automatic Temperature
Compensation is in use the ATC appears on the right side of the screen.
• If an erroneous situation is encountered
during the calibration, 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, temperature probe and dosing
tip 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
again.
• This error message appears when the pump
is not working properly. Check the tubing,
valve and syringe. Press Restart to try
again.
27
TITRATION PROCEDURE
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• For best accuracy, before taking any measurement, ensure that the pump is calibrated on the
selected range following the “Pump Calibration Procedure” (see page 26).
Note: Verify that the instrument has been calibrated (pH and pump) before performing any
titrations.
• Refer to “Setup Menu” (see page 11) to set up the instrument for your measurement.
• Select the corresponding range according to the table below:
Sample preparation: Use a clean tip and 2000 uL automatic pipette to precisely add the
appropriate amount of wine sample to a clean beaker as indicated below:
Low Range - 10 ml
High Range - 2 ml
Note: Failure to use a clean pipette will result in erroneous readings.
• Fill the beaker up to the 50 mL mark with distilled or deionized
water.
• Press Titrator.
Note: DO NOT PLACE THE TIP INTO THE SAMPLE
BEAKER. PLACE THE TIP OVER A WASTE BEAKER.
A SMALL AMOUNT OF TITRANT IS DISPENSED
WHEN THE PUMP RESETS.
• Press Start to begin a titration.
• Place the stir bar in the beaker and put the beaker in the
minititrator top.
• Place the probe holder on the top of the beaker and secure it
by turning clockwise.
• Rinse the pH electrode with deionized water and immerse
into the sample until the PTFE reference junction is completely
submerged. Be sure that the tip of the electrode is not hitting
the stir bar.
28
• 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 under range “----” symbol appears blinking.
• The titration curve can be visualized during a titration by pressing Plot ON. Press Plot OFF to
exit this mode.
• At the end of the titration the concentration is displayed in g/L as tartaric acid. The titration curve
can be viewed by pressing Plot ON. Press Plot OFF to exit this mode.
• Press LOG to record the concentration value into the instrument’s memory. A message will
be displayed for a few seconds indicating the amount of free log space. Up to 200 log
samples can be recorded in the instrument’s memory.
29
• Press Restart to begin a new titration or ESC to return to the titration menu.
• If the concentration exceeds the range limits
(> 5.0 g/L for Low Range, > 25.0 g/L for
High Range) the exceeded range limit will be
displayed blinking. Another titration can be
started by pressing Restart.
• “Wrong input” error message appears when
the input reading (pH, temperature) exceeds the
specified limits. The pH or temperature value
and the concentration will blink indicating an
error.
• This screen appears when the stirrer is not
working properly. Check the stir bar and beaker
content. Press Restart to try again.
• This error message appears when the pump is not
working properly. Check the tubing, valve and
syringe. Press Restart to try again.
TIPS FOR AN ACCURATE MEASUREMENT
The instructions listed below should be followed carefully to ensure measurements are conducted
with the highest possible accuracy and precision.
• IT IS CRITICAL THAT THE TIP BE IMMERSED IN THE SOLUTION BEING TITRATED
(APPROXIMATELY 0.25 CM).
• Use a clean, volumetric pipette to measure and transfer the necessary volume of wine 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 wine sample immediately after it is obtained.
• Clean the electrode with HI 700635 or HI 700636 cleaning solutions specially designed for
the wine industry.
30
VIEW/DELETE TITRATOR RECORDED DATA
Press MENU then Recall to access the Titrator logs.
When an external USB storage device is connected, the Export key is displayed. It saves the
meter and titrator logs in two text format files on the storage device.
Press Meter or Titrator to view the respective logs.
The instrument will display a list of all the records stored in the log.
Use the ARROW keys to scroll the stored records list.
If the saved concentration was out of range, the “<” or “>” symbols are displayed in front of
the reading.
Press Delete to delete the selected log from the memory.
Press Del.All to delete all records.
Press Info to see detailed information about the highlighted record.
The selected record data and the titration curve data file name are displayed.
When a USB storage device 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.
31
Press Plot
to visualize the titration curve or ESC to return to the previous screen. On the titration
curve, the end point volume and pH are displayed. The titration data (Total Titrant Volume on the
x-axis and pH on the y-axis) can be scanned through with the dotted line by using the ARROW keys.
To zoom on the titration curve press Zoom.
If Delete or Del.All is pressed the instrument will ask for confirmation.
Press Yes to delete the record or No to return to the previous screen.
Deleting a single record will renumber the list of records.
If the titrator log is empty, the message “No records available!” will be displayed.
TITRATOR GLP INFORMATION
Press MENU then GLP.
From this screen it is possible to select the Electrode or the Pump GLP.
32
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.
pH MEASUREMENT
The HI 84502 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 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.
33
In order to take pH measurements, follow the next steps:
• Submerge the pH electrode 2 cm (0.8’’) and the temperature probe into the sample to be
tested and stir gently. Make sure the PTFE junction is completely submersed. 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.
During pH measurements with stirrer on, the stirrer icon will be displayed. In case of a stirrer
malfunction, the stirrer will stop and the stirrer icon will start blinking.
If measurements are taken successively in different samples, it is recommended to rinse the
electrodes thoroughly with deionized or distilled water and then with some of the next sample
to prevent cross-contamination.
The pH measurement is affected by temperature. In order to have accurate pH measurements,
the temperature effect must be compensated for. To use the Automatic Temperature Compensation
(ATC) feature, connect and submerge the HI 7662-T temperature probe into the sample as close
as possible to the electrode and wait for a few seconds. The “ATC” message will be shown on
the display. Automatic Temperature Compensation will provide pH corrected values for the
measured temperature. If Manual Temperature Compensation (MTC) is 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).
34
VIEW/DELETE RECORDED pH DATA
To view or delete previously logged pH records, press MENU then Recall to access the pH logs.
When an external USB storage device is connected, the Export key is displayed. It saves the
meter and titrator logs in two text format files on the storage device.
Press Meter or Titrator to view the respective logs.
The instrument will display a list of all the records stored in the log.
If the saved mV/pH measurements are out of range, the “<” or “>” symbols are displayed in
front of the reading.
Use the ARROW keys to scroll the list of records.
Press Delete to delete the selected log from the memory.
Press Del.All to delete all the records.
Press Info to see detailed information about the highlighted record.
Use ARROW keys when is displayed to scroll between the records.
Press ESC to return to the previous screen.
If Delete or Del.All is pressed the instrument will ask for confirmation.
Press Yes to delete the record or No to return to the previous screen without deleting.
35
Deleting a single record will renumber the list of records.
If the pH log is empty, the message “No records available!” will be displayed.
pH METER GLP INFORMATION
The pH meter GLP screens displays the last pH calibration data.
To view this information, press MENU key then GLP.
Press Electrode to view information regarding electrode calibration.
GLP contains a set of 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 and the calibration buffers. The buffers displayed in video inverse
mode are from the previous calibration.
If a calibration hasn’t been performed, the message “Not Calibrated” will be displayed.
36
PC INTERFACE AND DATA TRANSFER
Data stored on the meter with the LOG function during pH/mV measurement and titrations can
be transferred from the meter to a USB stick using the Export function from the log recall menu.
Two text files are transferred on the USB stick. These files can be used for further 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 be used for further analysis.
If the instrument has no logged Meter or Titrator records, the PC connected screen is displayed.
37
TROUBLESHOOTING GUIDE
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38
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39
ELECTRODE CONDITIONING AND MAINTENANCE
PREPARATION PROCEDURE
Remove the protective cap of the pH electrode (HI 1048B).
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal with electrodes. They will
disappear when rinsed with distilled/deionized water.
During transport, tiny bubbles of air may form inside the glass bulb, affecting proper functioning
of the electrode. These bubbles can be removed by “shaking down” the electrode as you would
do with a glass thermometer.
If the bulb and/or junction is dry, soak the electrode in HI 70300
one hour.
If the fill solution (electrolyte) is more than 2½ cm (1”) below the fill hole, add HI 7082 3.5M
KCl Electrolyte Solution.
For faster response, unscrew the fill hole screw during measurements.
Storage Solution for at least
40
STORAGE PROCEDURE
To minimize clogging and assure a quick response time, the glass bulb and the junction of the
electrode should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of HI 70300 Storage Solution or, in
its absence, with HI 7082 Fill Solution. Follow the Preparation Procedure before taking
measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to the instrument must be
intact and there must be no points of broken insulation on the cable or cracks on the electrode
stem or bulb. Connectors must be perfectly clean and dry. If any scratches or cracks are present,
replace the electrode. Rinse off any salt deposits with water.
PROBE MAINTENANCE
Refill the reference chamber with fresh electrolyte (HI 7082). Allow the electrode to stand
upright for 1 hour. Follow the Storage Procedure above.
pH CLEANING PROCEDURE
•
Wine deposits
•
Wine stains
Soak in Hanna HI 70635 cleaning solution for 15 minutes
Soak in Hanna HI 70636 cleaning solution for 15 minutes
IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thoroughly
with distilled water, refill the reference chamber with fresh electrolyte and soak the electrode in
HI 70300 Storage Solution for at least 1 hour before taking measurements.
41
ACCESSORIES
REAGENTS
HI 84502-50 Titrant Solution (230 mL)
HI 84502-55 Calibration Standard (120 mL)
pH CALIBRATION SOLUTIONS
HI 7004M Buffer solution pH 4.01 (230 mL)
HI 7007M Buffer solution pH 7.01 (230 mL)
HI 70082M Buffer solution pH 8.20 (230 mL)
HI 7010M Buffer solution pH 10.01 (230 mL)
ELECTRODES
HI 1048B pH electrode
HI 7662-T Temperature probe
ELECTRODE FILL SOLUTION
HI 7082 Electrode fill solution (4 x 30 mL)
ELECTRODE STORAGE SOLUTION
HI 70300L Electrode storage solution (500 mL)
ELECTRODE CLEANING SOLUTION
HI 70635L Cleaning solution for wine deposits (500 mL)
HI 70636L Cleaning solution for wine stains (500 mL)
OTHER ACCESSORIES
HI 70500 Tube set with cap for titrant bottle, tip and valve
HI 71005/8 115 Vac to 12 Vdc, 800 mA
HI 71006/8 230 Vac to 12 Vdc, 800 mA
HI 731319 Stir bar (10 pcs., 25 x 7 mm)
HI 731342 Automatic pipette 2000 µL
HI 731352 Tips for 2000 µL automatic pipette (4 pcs.)
HI 740036P 100 mL Beaker (10 pcs.)
HI 740236 5 mL Syringe for minititrator
HI 920013 PC Connection Cable
42
WARRANTY
HI 84502 is guaranteed for two years against defects in workmanship and materials when used
for it’s intended purpose and maintained according to instructions. Electrodes and probes are
guaranteed for six months. This warranty is limited to repair or replacement free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered.
If service is required, contact your dealerfrom whom you purchased the instrument. If under
warranty, report the model number, date of purchase, serial number and the nature of the
problem. 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 Technical Service department and then send it with shipping costs
prepaid. When shipping any instrument, make sure it is properly packed for complete protection.
To validate your warranty, fill out and return the enclosed warranty card within 14 days from the
date of purchase.
RECOMMENDATION FOR USERS
Before using this product, make sure that it is entirely suitable for your specific application and for the
environment in which it is used.
Operation of this instrument may cause unacceptable interferences to other electronic equipment, this
requiring the operator to take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may degrade the instrument’s EMC
performance.
To avoid damages or burns, do not put the instrument in microwave ovens. For your’s and the instrument’s
safety, do not use or store the instrument in hazardous environments.
Hanna Instruments reserves the right to modify the design, construction or appearance of its products
without advance notice.
43
Hanna Instruments Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket, RI 02895 USA
Technical Support for Customers
Tel. (800) 426 6287
Fax (401) 765 7575
E-mail tech@hannainst.com
www.hannainst.com
Local Sales and Customer Service Office
Printed in EUROPE
ROMANIA
MAN84502 10/12
44
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