Hanna Instruments HI96801 User Manual

Instruction Manual

HI 96801

Refractometer for Sucrose

Measurements

www.hannainst.com

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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 [e-mail].

This instrument is in compliance with

directives.

TABLE OF CONTENTS

PRELIMINARY EXAMINATION ............................................................................................. 2

GENERAL DESCRIPTION ..................................................................................................... 3

SPECIFICATIONS .................................................................................................................. 3

PRINCIPLE OF OPERATION ................................................................................................4

FUNCTIONAL DESCRIPTION................................................................................................ 5

DISPLAY ELEMENTS ............................................................................................................ 6

WARNINGS ...........................................................................................................................6

ERROR MESSAGES .............................................................................................................. 7

CALIBRATION PROCEDURE ................................................................................................8

MEASUREMENT PROCEDURE .............................................................................................9

MAKING A STANDARD BRIX SOLUTION ..........................................................................10

CHANGING TEMPERATURE UNITS ................................................................................... 10

BATTERY REPLACEMENT .................................................................................................11

WARRANTY ........................................................................................................................11

GENERAL DESCRIPTION

The HI 96801 Digital Sucrose Refractometer is a rugged portable, water resistant device that
benefits from Hanna’s years of experience as a manufacturer of analytical instruments.

The HI 96801 is an optical instrument that employs the measurement of refractive index to
determine the % Brix of sugar in aqueous solutions. The method is both simple and quick. Samples
are measured after a simple user calibration with deionized or distilled water. Within seconds the
instrument measures the refractive index of the sample and converts it to % Brix concentration units.
The HI 96801 digital refractometer eliminates the uncertainity associated with mechanical
refractometers and is easily portable for measurements in the field.

The measurement technique and temperature compensation employ methodology recommended in
the ICUMSA Methods Book (Internationally recognized body for Sugar Analysis).

Temperature (in °C or °F) is displayed simultaneously with the measurement on the large dual level
display along with icons for Low Power and other helpful message codes.

Key features include:

• Dual-level LCD

• Automatic Temperature Compensation (ATC)

• Easy setup and storage

• Battery operation with Low Power indicator (BEPS)

• Automatically turns off after 3 minutes of non-use.

PRELIMINARY EXAMINATION

Remove the instrument from the packing materials and examine carefully to ensure no
damage has occurred during shipping. If any damage has occurred, notify your Dealer
or closest Hanna Customer Service Center.

Each HI 96801 instrument is supplied with:

• 9 V battery

• Instruction manual

Note:Save all packing material until you are sure that the instrument functions

correctly. A defective instrument must be returned in its original packing.

MODEL IDENTIFICATION
HI 96801

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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SPECIFICATIONS

Range: 0 to 85% Brix / 0 to 80°C (32 to 176°F)
Resolution: ± 0.1% Brix / ±0.1°C (±0.1°F)
Accuracy: ± 0.2% Brix / ± 0.3°C (±0.5°F)
Temperature Compensation: Automatic between 10 and 40°C (50 - 104°F)
Measurement Time: Approximately 1.5 seconds
Minimum Sample Volume: 100μL (cover prism totally)
Light Source: Yellow LED
Sample Cell: SS ring and flint glass prism
Case Material: ABS
Enclosure Rating: IP 65
Battery Type / Life: 1 X 9V / 5000 readings
Auto-Off: After 3 minutes of non-use
Dimensions: 19.2(W) x 10.2(D) x 6.7 (H)cm
Mass: 420g

The Brix determination is made by measuring the refractive index of a solution. Refractive Index is
an optical characteristic of a substance and the number of dissolved particles in it. Refractive Index
is defined as the ratio of the speed of light in empty space to the speed of light in the substance. A
result of this property is that light will “bend”, or change direction, when it travels through a
substance of different refractive index. This is called refraction.
When passing from a material with a higher to lower refractive index, there is a critical angle at
which an incoming beam of light can no longer refract, but will instead be reflected off the interface.
The critical angle can be used to easily calculate the refractive index according to the equation:

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTIONPRINCIPLE OF OPERATION

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

TOP VIEW

sin (θ

Where n2 is the refractive index of the lower-density medium; n1 is the refractive index of the
higher-density medium.

In the HI 96801, light from an LED passes through a prism in contact with the sample. An image
sensor determines the critical angle at which the light is no longer refracted through the sample.
The HI 96801 automatically applies temperature compensation to the measurement and converts
the refractive index of the sample to sucrose concentration in units of percent (by weight) Brix.

) = n2 / n

critical

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1. Liquid Crystal Display (LCD)

2. Read Key (User Measurement)

3. Zero Key (User Calibration)

4. On/Off

5. Primary Display

6. Secondary Display

7. Stainless Steel Sample Well and Prism

BOTTOM

8. Battery Cover

9. Battery Compartment

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