Hanna Instruments HI931 User Manual
MANUALS
AUTOMATIC
POTENTIOMETRIC TITRATOR
HI931
TABLE OF CONTENTS
HI931 AUTOMATIC POTENTIOMETRIC TITRATOR
Congratulations on choosing your new Hanna titrator. It is a powerful and versatile instrument capable of accurate and fast
analysis of a wide range of samples. In this manual you’ll find:
QUICK START GUIDE
This guide will help you quickly setup, operate, and introduce you to your new titrator. It covers basic connections, user interface,
how to perform calibrations, and how to run a titration.
INSTRUCTION MANUAL
The manual provides a comprehensive description of the operating principles user interface, general options, methods, titration/
direct reading mode, pH, mV and ISE mode, maintenance, etc.
APPLICATIONS BROCHURE
This brochure contains complete instructions for commonly-used analyses. Additional methods and method packs are available;
contact your local Hanna office for more details.
TITRATION THEORY
This guide outlines the principles of operation of the titrator. It covers the chemistry of titrations, titration types, and result
calculations.
If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com or view our worldwide contact
list for a Hanna Instruments representative near you at www.hannainst.com.
QUICK START GUIDE
AUTOMATIC
POTENTIOMETRIC TITRATOR
HI931
Congratulations on choosing a Hanna Instruments product.
Please read this Quick Start Guide carefully before using the instrument. This guide will provide you with the necessary
information for the correct use of the instrument.
The purpose of this guide is to present a quick overview of setting up and using the instrument.
For detailed information illustrating the extensive capabilities of your titrator, please refer to the Instruction Manual.
Dear
Customer,
© 2018 Hanna Instruments
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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QUICK START GUIDE
INTRODUCTION .................................................................................................................................................................
SAFETY MEASURES ...........................................................................................................................................................
TITRATOR CONNECTIONS .................................................................................................................................................
USER INTERFACE ...............................................................................................................................................................
HOW TO SELECT YOUR LANGUAGE ..................................................................................................................................
HOW TO USE THE CONTEXTUAL HELP .............................................................................................................................
METHODS ..........................................................................................................................................................................
HOW TO CALIBRATE A pH ELECTRODE .............................................................................................................................
HOW TO PERFORM A TITRATION ......................................................................................................................................
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5
7
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6
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QUICK START GUIDE
INTRODUCTION
The HI931 automatic titrator is designed to perform a wide variety of potentiometric titrations with high accuracy, flexibility and
reproducibility, allowing the user to obtain both accurate results and high-speed analysis.
The titrator can perform fixed endpoint or equivalence point titrations and direct measurements by measuring the pH/mV and
temperature of the sample.
Reports and methods can be transferred to a PC via a USB interface, saved to a USB storage device or printed directly from the
titrator. An external keyboard can also be attached for added convenience.
How can I find certain information?
- The Quick Start Guide will help the user learn how to operate the titrator within a short period of time.
- The Instruction Manual provides a complete description of the operating principles (user interface, general options, methods,
titration, pH, mV and ISE mode, maintenance, etc.).
- The Titration Theory outlines the basic concepts of titration.
- The contextual Help screens contain detailed explanations of every screen.
SAFETY MEASURES
The following safety measures must be followed:
1. Never connect or disconnect the pump assembly or other peripheral with the titrator turned on.
2. Verify that the burette and the attached tubing are assembled correctly.
3. Always check that the titrant bottle and the titration beaker are placed on a flat, stable surface.
4. Always wipe up spills and splashes immediately.
5. Avoid the following environmental working conditions:
• Severe vibrations
• Direct sunlight
• Atmospheric relative humidity above 95% non-condensing
• Environment temperatures below 10°C and above 40°C
• Explosion hazards
6. Have the titrator serviced by qualified service personnel only.
5
QUICK START GUIDE
TITRATOR CONNECTIONS
FRONT VIEW
REAR VIEW
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QUICK START GUIDE
USER INTERFACE
Keypad
The titrator’s keypad has 27 keys grouped in five categories, as follows:
Display
The user interface contains several screens. In each screen, many information fields are present at the same time. The information is
displayed in an easy-to-read manner.
Virtual option keys describe the function performed when the corresponding option key is pressed.
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QUICK START GUIDE
HOW TO SELECT YOUR LANGUAGE
To change the language, press from the main screen. Highlight the Language option. Using the and keys, select
the language and press .
Restart the titrator in order to apply the new language setting.
HOW TO USE THE CONTEXTUAL HELP
Information about the titrator can be easily accessed by pressing . The contextual help can be accessed at any time and it
provides useful information about the current screen.
METHODS
The HI931 titrator can store up to 100 methods (standard and user).
Standard Methods
Each titrator is supplied with a package of standard methods. Standard method packs are developed at Hanna Instruments to meet
analysis requirements of specific industries (e.g., water treatment, wine, dairy, etc.).
User-Defined Methods
User defined methods allow the user to create and save their own methods. Each new method is based on an existing method which
is altered to suit a specific application.
HOW TO CALIBRATE A pH ELECTRODE
To enter pH calibration mode, press , then , then .
PREPARATION
Pour small quantities pH 4.01, pH 7.01 and pH 10.01 buffer solutions into clean beakers. If possible, use plastic beakers to
minimize any EMC interferences.
For accurate calibration and to minimize cross-contamination, use two beakers for each buffer solution: one for rinsing the electrode
and one for calibration.
CALIBRATION PROCEDURE
• If the instrument has been previously calibrated and calibration was not cleared, the old calibration can be cleared by pressing .
Note: It is very important to clear calibration history when a new electrode is used. Most errors and warning messages that appear
during calibration depend on calibration history.
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QUICK START GUIDE
• Use the or to select pH 4.01 buffer solution.
• Use the second beaker of pH 4.01 buffer solution to rinse the pH electrode, temperature probe and propeller stirrer.
• Immerse the pH electrode, temperature probe and propeller stirrer in the pH 4.01 buffer solution. The pH electrode’s bulb must
be completely immersed in the buffer solution and the reference junction needs to be 5-6 mm below the surface. Add additional
buffer if necessary.
• Press to turn on the propeller stirrer.
• Once the reading has stabilized, press to update the calibration.
• Repeat this procedure for pH 7.01 and 10.01 buffer solutions.
• Press to accept and exit pH calibration mode.
HOW TO PERFORM A TITRATION
Required Solutions
• Titrant - 500 mL of 0.1 M (mol/L) Sodium Hydroxide (NaOH) in a titrant bottle.
• Sample - 0.1 mol/L Hydrochloric Acid (HCl).
• Distilled or deionized water.
Note: Analytical grade reagents and water should be used for accurate results.
Priming the Burette
• Insert the aspiration tube in the titrant bottle and the dispensing tube in a waste beaker.
• From the main screen press .
•Highlight the Prime Burette option and then press .
•Enter the number of burette rinses. At least 3 rinses are recommended.
•Press to start.
•The message “Executing...” will be displayed.
Note: Make sure you have continuous liquid flow inside the burette. For accurate results, the aspiration tube, the dispensing tube
and the syringe must be free of air bubbles.
Method Selection
For this analysis, we will use the HI1009 Neutralization w/ NaOH.
To select this method:
• Press . Use the and keys to highlight HI1009 Neutralization w/ NaOH.
• Press .
Setting Method Parameters
To display the method parameters, press .
The View/Modify Method screen will be displayed.
Only certain parameters can be changed.
For this titration, the NaOH titrant concentration and the size of the HCl sample need to be entered.
To accomplish this:
• Highlight Titrant Conc. option, then press .
The Titrant Concentration screen will be displayed.
• Enter the correct value, then press .
• Highlight Analyte Size option, then press .
• Enter the volume of the sample (e.g.: 5 mL), then press .
• Press , highlight Save Method option and then press .
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QUICK START GUIDE
Setup Titration Report
Users can select the information that is stored for each titration.
To setup the titration report, follow the procedure below:
• From the main screen, press . The Data Parameters screen will be displayed.
• Highlight Setup Titration Report and press .
• Mark the fields to be included in the titration report with the “*” symbol. Use the and keys to highlight a field and
/ to toggle the field.
• Press to save the customized report .
Preparing the Sample
• Add 50 to 65 mL of distilled/deionized water to the titration beaker.
• Use a pipette or burette to add 5.0 mL of the sample (0.1M Hydrochloric Acid (HCl)) into the same beaker.
• Slide the stirrer assembly up.
• Place the beaker under the stirrer assembly.
• Lower the stirrer assembly until the electrodes are submersed and the stirrer is close to the bottom of the beaker.
• Adjust the level of the sample solution with distilled/deionized water so that the pH electrode bulb is completely immersed in
the sample solution and the reference junction of the electrode is 5-6 mm below the surface.
Performing a Titration
• From the main screen, press . You will be prompted to enter the analyte size. Enter 5 mL and press . The titrator will
start the analysis.
• At the end of the titration, the message “Titration Completed” will appear on the display with the final concentration of the
analyte in the sample and the equivalence endpoint volume.
Understanding the Displayed Information
During a titration the following screen is displayed:
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QUICK START GUIDE
Viewing Graph During Titration
After a few doses are dispensed, will become active. Press to display the real-time titration graph.
The curves displayed are plots of the pH and the 1st derivative versus Titrant Volume (for details, see the Instruction Manual).
The two graphs are scaled to fit in the same screen window. Press to change the y-axis scale to either the pH values or the
1st derivative values.
Titration Termination
The titration is normally terminated when the first equivalence endpoint is detected according to the selected algorithm. To ensure the
correct detection and interpolation of the equivalence endpoint, the titrator will dispense a few additional doses after the endpoint
was reached.
The titration result can be displayed either in the main screen or in the Graph of Titration Data screen:
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QUICK START GUIDE
When the titration has ended, the titrator will display the equivalence endpoint volume and the final concentration of the analyte
together with the "Titration Completed" message.
To view the titration graph and/or results, press .
When the titration ends, an “x” will mark the endpoint on the pH versus titrant volume curve in the Graph of Titration Data
screen. The value of the endpoint volume is also displayed next to the endpoint.
Results
The results obtained from a titration are stored in a report file that can be viewed, transferred to a USB Storage Device or PC and
printed.
Viewing the last titration data
• From the main screen, press . The Data Parameters screen will be displayed.
• From the Data Parameters screen highlight the Review Last Analysis Report option and press . The Review Result
screen will be displayed.
• Use the and keys to display information related to the last titration performed.
See Titration Report on next page.
Printing the titration report
Connect a DOS / Windows-compatible parallel printer directly to the DB 25-pin connector located on the back of the titrator.
Note: When connecting the printer, please turn off the titrator and the printer.
Printing out the report:
• From the Review Report screen, press .
• During the information transfer to the printer, the message “Printing” will be displayed on the screen.
• Press to return to the Data Parameters screen.
• Press again to return to the main screen.
Saving data to USB Storage Device
This feature allows saving the results of titrations or pH / mV / ISE logging sessions on a USB storage device.
• From the main screen, press , the General Options screen will be displayed.
• Highlight the Save Files to USB Storage Device option using the and keys.
• Insert the USB storage device into the USB socket.
• Press , the List of Files on Titrator screen will be displayed.
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QUICK START GUIDE
HI931 - Titration Report
Method Name: Neutralization w/ NaOH
Time & Date: 15:01 Jun 13, 2018
Report ID: Ti_00011
Calibration Data
Buer Potential EciencyTemp.
Time and Date
4.010pH169.3mV98.8%24.0°CA
11:44 Jun 13, 2018
7.010pH-5.8mV98.7%23.9°CA
11:42 Jun 13, 2018
10.010pH-180.7mV98.7%24.0°CA
11:46Jun13,2018
GLP&MeterInformation
Sample Name:
CompanyName:
Operator Name:
ElectrodeName:
Field 1:
Field 2:
Field 3:
TitratorSoftwareVersion:v1.00
BaseBoardSoftwareVersion:v1.00
Pump1SoftwareVersion:v1.00
Stirrer1SoftwareVersion:v1.00
Titrator Serial Number: TT180525011
AnalogBoard1SerialNumber:AB180525005
Pump1SerialNumber:DP180525004
Stirrer 1 Serial Number: OS180524001
Analog1CalibrationDate:May25,2018
MethodParameters
Name: Neutralization w/ NaOH
MethodRevision:3.0
AnalysisType:StandardTitration
StirrerConguration:
Stirrer: Stirrer 1
StirringSpeed:1400RPM
• Use the and keys to select the report files.
• Press to transfer all available reports to the USB storage device, or highlight the name of the report file to be
transferred and press .
• Transferring a report file will automatically transfer the corresponding log file and titration graph (*.BMP file if applicable).
• Press to return to the General Options screen.
• Press again to return to the main screen.
Titration report
While scrolling with the and keys, the fields below can be seen on the titrator display or printed. The same
information is available on the saved report file (Ti_00007.rpt in this example).
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QUICK START GUIDE
PumpConguration:
Titrantpump:Pump1
DosingType:Dynamic
MinVol:0.050mL
MaxVol:0.500mL
deltaE:20.000mV
EndPointMode:pH1EQpoint,1stDer
RecognitionOptions
Threshold:50mV/mL
Range:NO
FilteredDerivatives:NO
Pre-TitrationVolume:0.000mL
Pre-TitrationStirTime:0sec
MeasurementMode:SignalStability
deltaE:1.0mV
deltat:2sec
Minwait:2sec
Maxwait:15sec
ElectrodeType:pH
Blank Option: No Blank
Calculations:SampleCalc.byVolume
DilutionOption:Disabled
TitrantName:0.1NHaOH
TitrantConc.:0.1000N(eq/L)
AnalyteSize:10.0000mL
AnalyteEntry:Fixed
MaximumTitrantVolume:20.000mL
PotentialRange:-2000.0to2000.0mV
Volume/FlowRate:25mL/50.0mL/min
SignalAveraging:1Reading
SignicantFigures:XXXXX
N(eq/L)-->meq/L
Veq1000meq
-*--*-------
Leq
-------------
mL L
--*------
1000mL
V=volumedispensedinliters.
0.100eq/L->titrantconc.
10.000mL->samplevolume
NrVolume[mL]mVpHGraphicTemp.[°C]Time
00.000274.42.2190.024.9A00:00:00
10.050274.42.2201.025.0A00:00:07
20.100274.42.2200.025.0A00:00:10
30.200274.32.222-0.825.0A00:00:12
40.400274.02.227-1.625.0A00:00:15
50.800273.22.241-2.025.0A00:00:18
61.300271.52.271-3.425.0A00:00:24
71.800269.52.304-3.925.1A00:00:30
82.300267.22.344-4.725.1A00:00:37
92.800264.42.393-5.725.1A00:00:43
103.300260.82.455-7.225.1A00:00:50
113.800256.12.535-9.325.1A00:00:58
124.300250.32.635-11.725.1A00:01:05
134.800241.92.779-16.825.1A00:01:14
145.300228.33.011-27.225.1A00:01:23
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QUICK START GUIDE
155.800193.03.614-70.525.1A00:01:31
166.07721.06.556-620.025.1A00:01:48
176.128-38.27.568-1183.225.1A00:02:03
186.177-123.69.031-1708.025.1A00:02:19
196.227-157.79.616-682.825.1A00:02:28
206.278-174.59.903-335.825.1A00:02:35
216.339-187.810.130-215.925.1A00:02:42
TitrationResults
Method Name: Neutralization w/ NaOH
Time & Date: 15:01 Jun 13, 2018
AnalyteSize:10.0000mL
EndPointVolume:6.144mL
pHEquivalencePoint:8.063
Result:61.444meq/L
Initial&FinalpH:2.219to10.130
TitrationDuration:2:42[mm:ss]
Titration went to Completion
AnalystSignature:____________________
QS931 10/18
INSTRUCTION MANUAL
AUTOMATIC
POTENTIOMETRIC TITRATOR
HI931
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 the 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 for a Hanna Instruments representative near you at www.hannainst.com.
Dear
Customer,
© 2018 Hanna Instruments
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.
TABLE OF CONTENTS
CHAPTER 1. INTRODUCTION
CHAPTER 2. SETUP
CHAPTER 3. USER INTERFACE
CHAPTER 4. GENERAL OPTIONS
CHAPTER 5. TITRATION METHODS
CHAPTER 6. TITRATION MODE
CHAPTER 7. pH MODE
CHAPTER 8. mV MODE
CHAPTER 9. ISE MODE
CHAPTER 10. AUXILIARY FUNCTIONS
CHAPTER 11. MAINTENANCE, PERIPHERALS
APPENDIX 1. TECHNICAL SPECIFICATIONS
APPENDIX 2. ACCESSORIES
CERTIFICATION
RECOMMENDATIONS FOR USERS
WARRANTY
1-1
INTRODUCTION
1. INTRODUCTION
HI931 is an automatic potentiometric titrator with high accuracy, great flexibility and repeatability.
The titrator is designed to perform a variety of potentiometric titrations, allowing the user to obtain both good results and high-speed
analysis.
The main attributes of the HI931 titrator are:
• Small footprint, requires minimal bench space
• Casing made with strong, chemically resistant plastic
• Flexible electrode holder supports up to 3 electrodes, 4 dispensing tubes, 1 temperature sensor and removable stirrer
• Electrode holder positions electrodes in the center of beaker, allowing for smaller sample sizes
• Integrated Peristaltic Pump available for reagent addition
• Support for 100 titration methods
• User-customizable reports
• Integrated research grade pH/mV/ISE meter
• Clearly displayed warning and error messages
This manual provides information regarding installation and functionality of the titrator and refined operation suggestions.
Before using the titrator, it is recommended you become familiar with its various features and functionality.
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2-1
SETUP
CHAPTER 2. SETUP
2.1. UNPACKING ...............................................................................................................................................................
2.2. SAFETY MEASURES ....................................................................................................................................................
2.3. INSTALLATION ...........................................................................................................................................................
2.3.1. TITRATOR FRONT VIEW ..............................................................................................................................................
2.3.2. TITRATOR REAR VIEW ................................................................................................................................................
2.3.3. TITRATOR REAR VIEW WITH PERISTALTIC PUMP ...........................................................................................................
2.3.4. TITRATOR RIGHT-SIDE VIEW .......................................................................................................................................
2.3.5. TITRATOR ASSEMBLY .................................................................................................................................................
2.3.5.1. ASSEMBLING STIRRER AND ELECTRODES HOLDER ...............................................................................................
2.3.5.2. ATTACHING STIRRER AND ELECTRODES ...............................................................................................................
2.3.5.3. CONNECTING THE PUMP ....................................................................................................................................
2.3.5.4. ATTACHING BURETTE BLANK SUPPORT ...............................................................................................................
2.3.5.5. ATTACHING THE BURETTE ..................................................................................................................................
2.3.5.6. CONNECTING PERISTALTIC PUMP TUBING ...........................................................................................................
2.3.5.7. ELECTRICAL CONNECTIONS .................................................................................................................................
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2-4
2-5
2-6
2-6
2-8
2-9
2-11
2-4
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2-5
2-6
2-7
2-8
2-10
2-2
2-3
SETUP
2.1. UNPACKING
Remove the titrator and accessories from the packaging and examine it carefully to make sure that no damage has occurred during
shipping. Notify your nearest Hanna Service Center if damage is observed.
Each HI931 potentiometric titrator is supplied with:
ITEM QUANTITY
Titrator .............................................................................................................................................................................. 1 pc
Pump Assembly .................................................................................................................................................................. 1 pc
Burette Assembly ................................................................................................................................................................ 1 pc
• Burette (with 25-mL syringe)
• Aspiration Tube with Fitting and Protection Tube
• Dispensing Tube with Normal Dispensing Tip, Fitting, Protection Tube and Tube Guide
• Tube Locks
• Tool for Burette Cap Removal
• Light Spectrum Protection Screen
Electrodes Holder and Stirrer ............................................................................................................................................... 1 pc
• Stirrer Holder
• Overhead Stirrer
• Propellers (3 pcs)
• Support Rod
Burette Blank Support ......................................................................................................................................................... 1 pc
Pump and Burette Locking Screws with Plastic Head ............................................................................................................. 2 pcs
Temperature Sensor ............................................................................................................................................................ 1 pc
Shorting Cap ...................................................................................................................................................................... 1 pc
Power Adapter .................................................................................................................................................................... 1 pc
USB Cable ......................................................................................................................................................................... 1 pc
Instruction Manual.............................................................................................................................................................. 1 pc
USB Memory Stick .............................................................................................................................................................. 1 pc
HI900 PC Application (Installation Kit on USB Stick) ............................................................................................................. 1 pc
Quality Certificate ............................................................................................................................................................... 1 pc
See APPENDIX 2, titrator components section for pictures.
If any of the items are missing or damaged, please contact your sales representative.
Note: Save all packing materials until you are sure that the instrument functions correctly. Any damaged or defective items must
be returned in their original packing materials together with the supplied accessories.
2-4
SETUP
2.2. SAFETY MEASURES
The following safety measures must be followed:
1. Never connect or disconnect the pump assembly with the titrator turned on.
2. Verify that the burette and the attached tubing are assembled correctly (see Maintenance, Peripherals, Burette Maintenance
for more details).
3. Always check that the titrant bottle and the titration beaker are on a flat surface.
4. Always wipe up spills and splashes immediately.
5. Avoid the following environmental working conditions:
• Severe vibrations
• Direct sunlight
• Atmospheric relative humidity above 95% non-condensing
• Environment temperatures below 10°C and above 40°C
• Explosion hazards
6. Have the titrator serviced only by qualified service personnel.
2.3. INSTALLATION
2.3.1. TITRATOR FRONT VIEW
2-5
SETUP
2.3.2. TITRATOR REAR VIEW
2.3.3. TITRATOR REAR VIEW WITH PERISTALTIC PUMP
2-6
SETUP
2.3.4. TITRATOR RIGHT-SIDE VIEW
2.3.5. TITRATOR ASSEMBLY
Note: Assembly operations must be completed before connecting the Titrator to the power supply!
2.3.5.1. ASSEMBLING STIRRER AND ELECTRODES HOLDER
To assemble the electrode holder and support rod:
• Remove protective cap from titrator case
• Insert the support rod into the titrator case and turn it clock-wise to secure it in place
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