Hanna Instruments HI 84430 User Manual

Instruction Manual

HI 84430

TOTAL ACIDITY

MINITITRATOR & pH METER

for Water Analysis

www.hannainst.com

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.

This instrument is in compliance with

directives.

TABLE OF CONTENTS

PRELIMINARY EXAMINATION................................................................................................. 4

GENERAL DESCRIPTION ........................................................................................................ 4

SPECIFICATIONS ................................................................................................................... 6

PRINCIPLE OF OPERATION .................................................................................................... 8

FUNCTIONAL AND PHYSICAL DESCRIPTION............................................................................. 9

TITRATOR STARTUP ........................................................................................................... 11

SETUP CONFIGURATION MENU .......................................................................................... 12

ELECTRODE PREPARATION .................................................................................................. 18

ELECTRODE CALIBRATION PROCEDURE................................................................................. 19

pH BUFFER TEMPERATURE DEPENDENCE ............................................................................ 23

PUMP TUBE INSTALLATION................................................................................................. 24

PURGE .............................................................................................................................. 24

PUMP CALIBRATION PROCEDURE ........................................................................................ 26

TITRATION PROCEDURE ..................................................................................................... 29

pH MEASUREMENT ............................................................................................................ 34

TEMPERATURE CALIBRATION PROCEDURE (for technical personnel only) ............................... 38

PC INTERFACE ................................................................................................................... 40

TROUBLESHOOTING GUIDE ................................................................................................ 44

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.

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 84430 minititrator is supplied complete with:

• HI 1131B pH electrode

• HI 7071 Filling solution (30 mL)

• HI 7662-M Temperature probe

• HI 84430-50 Titrant low range (100 mL)

• HI 84430-51 Titrant high range (100 mL)

• HI 84430-55M Pump calibration solution (230 mL)

• HI 84430-58 Additional reagent (30 mL)

• HI 7061 Cleaning solution

• HI 7001M pH 1.68 buffer solution (230 mL)

• HI 7004M pH 4.01 buffer solution (230 mL)

• HI 70083M pH 8.30 buffer solution (230 mL)

• Two 100 mL beakers

• Two tube sets with dispensing tip

• Stir bars (medium 2 pcs.)

• 12 Vdc power adapter

• 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.

GENERAL DESCRIPTION

The HI 84430 is an easy to use microprocessor-based automatic minititrator and pH meter designed for the rapid and accurate analysis of Total Titratable Acidity in water. By eliminating subjective factors including color indicators, errors in mathematical calculations or erratic titrant additions from the measurement, the HI 84430 makes Total Titratable acidity analysis precisely. This will quickly become a valuable analysis tool of waters and waste waters.

The instrument benefits from Hanna’s many years of experience as manufacturer of quality analytical instruments. A clear and well-designed user interface makes the instrument intuitive and simple to use. A dedicated HELP key aids in set-up, calibration, status and troubleshooting.

By simply pressing the START key, the HI 84430 automatically starts pump operation and titrates the sample to the end point. The HI 84430 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 Titratable Acidity determination is instantaneously displayed in selected measurement units on the large dot matrix display. The instrument is ready for the next analysis immediately.

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 via USB connection

MEASUREMENT SIGNIFICANCE

Acidity is the quantitative capacity of the water sample to react with a strong base solution in order to obtain a pH end point value. Acids contribute to the corrosive capacity of the water, influence the chemical reaction rates and biological processes. The results of acidity measurement also reflect the quality of the waters (surface, drinking, waste waters) and are an essential monitoring device to define and control the pollution. Strong acids (such as mineral acids: HNO

, H2SO4, HCl) and weak acids (such as organic acids), carbon dioxide

content in water, or others acid components (some polyvalent cations such as aluminium, iron, manganesse, chromium, cadmium trivalent cations) can contribute to the acidity of water. According to the Standard Methods for the Examination of Waters and Wastewaters, Volume 20, three options exist to determine water acidity:

• pH measurement using the meter in pH mode.

• Strong acidity determination by titration of the water samples with alkaline reagent to a

3.7 pH end point (known as methyl orange acidity).

• Total acidity determination by titration of the water samples with alkaline reagent to a

8.3 pH end point (known as phenolphthalein acidity).

Potentiometric end point determination, using a pH electrode, is more objective than visual end point determination, using color changing indicators. The HI 84430 is a potentiometric titrator. The volume of dispensing titrant necessary to reach the end point is used to calculate the water acidity, expressed in mg/L as CaCO

(most usual unit) or meq/L as CaCO3.

Interferences:

• dissolved gases, lost or gained during sample storage or transport, can modify the acidity

of the samples;

• the presence in the samples of: precipitates, solids suspensions, oils;

• samples containing polyvalent cations (aluminum, iron, manganese, chromium) may

react slowly with the titrant causing a drifting end point;

To eliminate or diminish the interference effects, it is recommended:

• to treat the samples that contain polyvalent cations with hydrogen peroxide in order to

increase the hydrolyzing rate of metal ions present.

• to protect the samples against atmospheric action (store in an airtight vessel).

• to avoid vigorous shaking or mixing: stir gently.

SPECIFICATIONS

Titrator Range Titratable acidity (low range)

: 15.0 - 500.0 mg/L as CaCO

mg/L meq/L : 0.3 - 10.0 meq/L as CaCO Titratable acidity (high range)

: 400 - 4000 mg/L as CaCO

mg/L meq/L : 8 - 80 meq/L as CaCO

Resolution Titratable acidity (low range):

0.1 mg/L

0.1 meq/L Titratable acidity (high range): 1mg/L

1meq/L Accuracy 5% of reading Titration method Acid-base titration (total acidity / strong acidity) Principle End point titration : 8.3 pH / 3.7 pH Pump debit 0.5 mL/min Stirring speed 600 rpm Log data Up to 50 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;

3 available buffers (1.68; 4.01; 8.30) Temperature manual or automatic from

compensation: -20 to 120 °C (-4 to 248 °F) Log data Up to 50 samples

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 1131B (included)

Temperature Probe HI 7662-M (included) Environment 0 to 50 °C (32 to 122 °F); max 95% RH non-condensing Power supply 12 Vdc power adapter Dimensions 208 × 214 × 163 mm (8.2×8.4×6.4”) (with beaker) Weight 2200 g (77 oz.)

REQUIRED REAGENTS Code Description Quantity/Test

HI 84430 - 50 Titrant (Low Range) 1 mL HI 84430 - 51 Titrant (High Range) 1 mL HI 84430 - 55M Pump Calibration Solution 2 mL for low range

20 mL for high range

PRINCIPLE OF OPERATION

Water acidity determination is based on the neutralization of all acidic species contained in water samples by titration with base solutions (the titrant alkaline reagent):

+OH-  H2O In an ideal solution, the end point of an acid titration corresponds stoichiometrically to the complete neutralization of the acids present. Water acidity results from strong and weak acids, and from the hydrolysis of salts. Due to these more complex mixtures, end points for water acidity are arbitrarily fixed on practical considerations. Unpolluted surface waters contain carbon dioxide as the main acidic component and titration of these samples corresponds to stoichiometric neutralization of carbonic acid (titration to 8.3 pH at 25°C degrees). Strong acidity of the polluted waters is determined by titration to 3.7 pH. If the samples are suspected to contain hydrolizable salts or polyvalent cations (such as chromium, iron, manganese), it is necessary to pretreat the samples with a HI 84430-58 reagent (see Sample preparation /Titration). A potentiometric acid-base titration employs an indicator electrode (such as a pH sensor) to establish the end point of the titration. The HI 84430 minititrator is designed to determine the acidity of waters by potentiometric titration in a low range (15-500mg/mL as CaCO Both Strong and Total acidity can be determined by the HI 84430, however the actual sample pH may limit your choice. If the measured pH is lower than 3.7 both total and strong acidity can be determined. If the sample pH is greater than 3.7 only total acidity can be determined. The HI 84430 utilizes two different titrant solutions to cover the entire measurement range. The titrants used have different concentrations, appropriate for each work range. Low Range measurements use HI 84430-50 titrant. High Range measurements use HI 84430-51 titrant. If the range is changed, the titrant and the tube set must be changed and the peristaltic pump must be purged and recalibrated. The standard solution (HI 84430-55M) is used for pump calibration for both working ranges, but the pump calibration solution volume used is different.

Titratable Acidity in waters, as performed on the HI 84430 minititrator, utilizes a simple sample preparation, a high quality peristaltic dosing pump for titrant, potentiometric endpoint detector and instantaneaous computations. To maintain the high precision of the titrator, a simple pump calibration procedure is required. A range change requires different titrant and a pump recalibration. The pump calibration involves the analysis of a known volume of a known solution (standard provided) and compensates for changes in pump dosing that may occur due to many factors including tube stretching or aging. This procedure should be performed regularly.

) and in a high range (400-4000mg/mL as CaCO3).

FUNCTIONAL AND PHYSICAL DESCRIPTION

OVERHEAD VIEWOVERHEAD VIEW

OVERHEAD VIEW

OVERHEAD VIEWOVERHEAD 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

REAR VIEWREAR VIEW

REAR VIEW

REAR VIEWREAR VIEW

8. Temperature probe

9. pH Electrode

10. Beaker

11. BNC electrode connector

12. Temperature probe socket

13. USB connector

14. Power switch

15. Power adapter connector

16. Peristaltic pump

FRONT VIEWFRONT VIEW

FRONT VIEW

FRONT VIEWFRONT VIEW

KEYPAD FUNCTION AND INDICATORS

ESC - 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 MENU - used to enter SETUP, Recall or GLP selection menu, while instrument is in pH or

Titration main screen STIR - used to start/stop the stirrer. Note: The stirer starts automatically during pump calibration and titration and cannot be stopped by pressing STIR key.

GUIDE TO INDICATORS

During the instrument’s operation a set of information is displayed on the LCD. Displayed icons:

Unstable reading. Stirrer on.

Pump running.

Parameter can be changed.

5. Functional key area

6. Indicates that the displayed value can be changed using ARROW keys

7. Temperature value (

°C, °F)

8. pH temperature compensation mode (Manual or Automatic)

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. The rollers compress the tubing, driving the titrant to the dispensing tip.

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. Pay attention to the Acidity Type.

• Connect the pH electrode and the temperature probe to the instrument.

• Calibrate the pH electrode. At least a single point calibration is necessary for titration.

• Place the peristaltic pump tube on the pump (inlet tube is connected with the reagent bottle, outlet tube is connected with the dosing tip). See the “Pump Tube Replacement” section for the procedure.

• Remove the reagent bottle cap and replace the bottle cap with the tubes. Place the reagent bottle in the appropriate place on the titrator top.

• Purge the titrant.

• Calibrate the pump.

• Prepare the sample.

• Run a titration and log sample results.

1. Current time and instrument mode information (pH meter or Titrator)

2. pH electrode condition information

3. Main reading information

4. Instrument status information

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SETUP CONFIGURATION MENU

Calibration timeout

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.

Press the corresponding function key to change the option.

Acidity type

Options: Total LR (total acidity low range)

Total HR (total acidity high range) Strong LR (strong acidity low range) Strong HR (strong acidity high range)

Press the corresponding function key to change

the option. From your knowledge of expected concentrations, use the table below to determine which settings are appropriate:

epyTytidicARLlatoTRLgnortSRHlatoTRHgnortS

OCaCL/gmegnartnemerusaeM

OCaCL/qem

)M55-03448IH(noitulosnoitarbilacpmuP Lm2Lm2Lm02Lm02

deriuqertnartiT 05-03448IH05-03448IH15

)Lm(eziselpmaS 05050505

elpmasfoHpmuminiM 3.8<7.3<3.8<7.3<

noitartitfotniopdnE Hp3.8Hp7.3Hp3.8Hp7.

005-51005-510004-0040004-004

00.01-3.00.01-3.08-808-8

-03448IH15-03448IH

pH resolution

Temperature unit

Backlight

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.

Options: 0.1, 0.01. Press the displayed function key in order to change

the pH resolution.

Options:

C, °F.

Press the function key in order to change the temperature unit.

Options: 0 to 8. Press Modify to access the backlight level.

Use Total LR or Strong LR for waters acidity in the 15 - 500 mg/L range. Use Total HR or Strong HR for waters acidity in the 400 - 4000 mg/L range. Use the appropriate titrant for each range. Also, the pump must be recalibrated when the measurement range is changed.

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Use the ARROW keys or increase/decrease the displayed constrast.

Press Accept to confirm or ESC to return to the setup menu.

/ in order to

Time format

Option: AM/PM or 24 hours.

Press the functional key to select the new value.

Contrast

Date / Time

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 increase/decrease the value.

Press Accept to confirm the value or ESC to return to the setup menu.

This option is used to set the instrument’s date and time.

Press Modify to change the date/time.

Press / to highlight the value to be modified (year, month, day, hour, minute or second). Use the ARROW keys to change the value.

Press Accept to confirm the new value or ESC to return to the setup.

/ in order to

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.

If no language can be loaded at startup the instrument will work in the “safe mode”. In “safe mode” all the messages are displayed in English and tutorial and help information are not available.

Tutorial

This option is used to enable/disable tutorial mode. If enabled this option will provide the user short

guides on the screen. Press the function key to select this option.

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