Hanna Instruments HI84531 User manual

INSTRUCTION MANUAL
HI84531
Total Alkalinity
Mini Titrator & pH Meter
for Water Analysis

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.
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
[email protected] or view our worldwide contact list at www.hannainst.com.
Dear
Customer,

3
TABLE OF CONTENTS
TABLE OF CONTENTS
1. Preliminary Examination ..................................................................................................... 4
2. Specifications..................................................................................................................... 5
3. General Description & Intended Use ..................................................................................... 7
4. Principle of Operation ......................................................................................................... 9
5. Functional Description....................................................................................................... 10
6. Titrator Startup................................................................................................................. 13
7. Setup Menu ..................................................................................................................... 14
8. Guide to Display Codes...................................................................................................... 19
8.1. Pump Calibration Messages ..................................................................................... 20
8.2. pH Calibration Messages ......................................................................................... 21
8.3. Titration Messages .................................................................................................. 22
9. Electrode Preparation........................................................................................................ 23
10. Electrode Calibration Procedure........................................................................................ 24
11. pH Buffer Temperature Dependence.................................................................................. 28
12. Dosing Pump Installation ................................................................................................ 29
13. Dosing Pump Prime Procedure ......................................................................................... 30
14. Pump Calibration Procedure............................................................................................. 32
15. Titration Procedure.......................................................................................................... 36
15.1. Tips for an Accurate Measurement .......................................................................... 39
15.2. View/Delete Titrator Recorded Data......................................................................... 39
15.3. Titrator GLP Information......................................................................................... 41
16. pH Measurement............................................................................................................ 42
16.1. View/Delete Recorded pH Data............................................................................... 43
16.2. pH Meter GLP Information ..................................................................................... 44
17. PC Interface & Data Transfer............................................................................................ 45
18. Electrode Conditioning & Maintenance.............................................................................. 46
19. Troubleshooting Guide..................................................................................................... 47
20. Accessories..................................................................................................................... 49
Certification........................................................................................................................... 50
Recommendations for Users.................................................................................................... 50
Warranty .............................................................................................................................. 50

4
PrELImINAry ExAmINATION
1. PRELIMINARY EXAMINATION
Remove the instrument and accessories from the packaging and examine it carefully. For further
assistance, please contact your local Hanna Instruments Office or email us at [email protected].
The HI84531 mini titrator is supplied with:
• HI1131B pH electrode
• HI7662-T Temperature probe
• HI84531-70 Reagent kit for titrable alkalinity in water
• HI7082 Electrode fill solution
• 100 mL beaker (2 pcs.)
• Dosing pump valve
• 5 mL syringe
• 2000 µL automatic pipette with two plastic tips
• 20 mL beaker (2 pcs.)
• Tube set (aspiration tube with titrant bottle cap and dispensing tube with tip)
• Stir bar
• Power adapter
• Instrument quality certificate
• Instruction manual
Note: Save all packing material until you are sure that the instrument works correctly. Any
damaged or defective item must be returned in its original packing material with the supplied
accessories.

5
SPECIFICATIONS
2. SPECIFICATIONS
Titrator
Range
Low Range (LR): 30.0 - 400.0 mg/L CaCO3
0.6 - 8.0 meq/L CaCO3
High Range (HR): 300 - 4000 mg/L CaCO3
6.0 - 80.0 meq/L CaCO3
Resolution LR: 0.1 mg/L / 0.1 meq/L
HR: 1 mg/L / 0.1 meq/L
Accuracy LR: ±1 mg/L or 3% of reading @ 25 °C whichever is greater
HR: ±10 mg/L or 3% of reading @ 25 °C whichever is greater
Sample volume 50 mL
Titration method Acid-base titration
Principle Endpoint titration pH 4.50 or pH 8.30
Pump speed 10 mL/min
Stirring speed 600 rpm
Log data Up to 200 samples
pH Meter
Range -2.0 to 16.0 pH / -2.00 to 16.00 pH
Resolution 0.1 pH / 0.01 pH
Accuracy ± 0.01 pH
Calibration 1, 2 or 3 calibration points;
4 available buffers (4.01, 7.01, 8.30, 10.01)
Temperature
compensation Manual or automatic
mV Meter
Range -2000.0 to 2000.0 mV
Resolution 0.1 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

6
SPECIFICATIONS
Other
Specifications
Electrode HI1131B
Temperature probe HI7662-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.)
Required Reagents
HI84531-50 Low Range Titrant
HI84531-51 High Range Titrant
HI84531-55 Calibration Standard

7
GENErAL DESCrIPTION & INTENDED USE
3. GENERAL DESCRIPTION & INTENDED USE
The HI84531 is an affordable, easy to use, microprocessor-based automatic mini titrator and
pH meter designed for the rapid and accurate analysis of Total Titratable Alkalinity in water. By
eliminating subjective factors including color indicators, errors in mathematical calculations or erratic
titrant additions from the measurement, this meter will quickly become a valuable analysis tool for
water and wastewater.
The meter benefits from Hanna Instruments’ many years of experience as a manufacturer of quality
analytical instrumentation. A clear and well-designed user interface makes the meter intuitive and
simple to use.
The meter 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.
By simply pressing the Start key in Titrator mode, the instrument will automatically titrate the sample
to the endpoint. The current pH and temperature are continuous displayed during titration process.
The concentration is instantaneously displayed in selected measurement units on the large dot matrix
display, 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
• 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 pH measurements; 200 for titration results)
• GLP feature, to view calibration data for pH electrode and pump
Significance of Use
Alkalinity is an important parameter for control and treatment of water (surface, drinking and
wastewater) it is indication of the waters buffering capacity or its ability to resist pH change.
Low alkalinity signifies that the water is susceptible to pH change, while high alkalinity indicates that
the water is able to resist a major change in pH.
Alkalinity is primarily a result of the carbonate (CO3
2¯), bicarbonate (HCO3¯) and hydroxide (OH¯)
concentration in water. However alkalinity concentrations include all contributions from borate,
phosphates, silicates, and other base species present.
Water samples are subject to interferences including:
• Dissolved gases that contribute to alkalinity are lost or gained during sampling, transport or
storage, these gasses can include carbon dioxide.
• Oily matter, suspend solids, precipitated and other waste matter can coat the glass electrode
causing a slow response time.

8
GENErAL DESCrIPTION & INTENDED USE
The HI84531 mini titrator uses a method based on Standard Methods for the Examination Water and
Wastewater. Standard Methods refers two types of alkalinity:
1. Strong Alkalinity or Phenolphthalein Alkalinity is typically determined by a titration to pH 8.3.
2. Total Alkalinity or Bromcresol Green Alkalinity is typically determined by a titration to pH 4.5.
The water sample is titrated until a fixed pH endpoint (4.5 or 8.3), the endpoint is determined by the
potentiometric input.

9
PrINCIPLE OF OPErATION
4. PRINCIPLE OF OPERATION
Water alkalinity determinations are based on the neutralization of all basic species contained in the
sample by titration with an acid:
OH¯ + H+H2O
In an ideal solution, the endpoint of an alkalinity titration corresponds stoichimetrically to the
complete neutralization of all the bases present. Due to the complex sample matrix, titrations are
typically performed to a fixed pH endpoint. Two types of alkalinity can be determined based on
the selected endpoint Total Alkalinity (pH 4.5) or Strong Alkalinity (pH 8.3). The endpoint can be
determined visually using a color indicator (i.e. phenolphthalein or bromocresol green), however
this endpoint can be become objective depending on the analysts. The HI84531 removes this issue
by titrating to a fixed pH endpoint (4.5 or 8.3) determined by the user. The concentration can vary
significantly with the selected pH endpoint. For precise analysis the sample size, volume of titrant
added and titrant concentration must be known.
The HI84531 Total Alkalinity Mini Titrator utilizes a simple sample preparation, a high quality dosing
pump for titrant additions, potentiometric endpoint determination and instantaneous computations.
To maintain the high accuracy of the mini titrator a simple pump calibration is required. The pump
calibration uses a known quantity of a known solution to compensate for changes in the dosing
system, this procedure should be performed regularly.

10
FUNCTIONAL DESCrIPTION
5. FUNCTIONAL DESCRIPTION
Front View
2
38
9
7
6
15
4
1. Dosing pump valve
2. Aspiration tube
3. Titrant bottle
4. Dispensing tube
5. Syringe
6. Temperature probe
7. pH electrode
8. Electrode holder
9. Beaker
Top View
1
4
65
2 3
1. Titrant bottle
2. Dispensing tube
3. Electrode holder
4. Liquid Crystal Display (LCD)
5. Functional keys
6. Keypad