Hanna Instruments HI 96821 User Manual

Instruction Manual

HI 96821

Refractometer for

Sodium Chloride 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 this 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

MEASUREMENT GUIDELINES .............................................................................................. 6

CALIBRATION PROCEDURE ................................................................................................ 7

MEASUREMENT PROCEDURE ............................................................................................. 8

TO CHANGE MEASUREMENT UNIT .....................................................................................9

TO CHANGE TEMPERATURE UNIT...................................................................................... 9

MAKING A STANDARD SODIUM CHLORIDE SOLUTION ..................................................10

BATTERY REPLACEMENT .................................................................................................10

WARRANTY ........................................................................................................................ 10

ERROR MESSAGES ............................................................................................................11

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 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.

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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GENERAL DESCRIPTION

The HI 96821 Digital Refractometer is a rugged portable, water resistant device that benefits from
Hanna’s years of experience as a manufacturer of analytical instruments.
The HI 96821 is an optical instrument that employs the measurement of the refractive index to
determine sodium chloride concentration in aqueous solutions used in food preparation. It is not
intended for sea water salinity measurements. The measurement of refractive index is simple and
quick and provides the user an accepted method for NaCl analysis. Samples are measured after a
simple user calibration with deionized or distilled water. Within seconds the instrument measures
the refractive index of the solution. The digital refractometer eliminates the uncertainty associated
with mechanical refractometers and is easily portable for measurements where you need them.
The instrument utilizes internationally recognized references for unit conversion and temperature
compensation. It can display the measurement of NaCl concentration 4 different ways: g/100 g,
g/100 mL, Specific Gravity, and °Baumé.
Temperature (in °C or °F) is displayed simultaneously with the measurement (on 3 of the ranges)
on the large dual level display along with icons for Low Power and other helpful message codes.
Key features include:

• Waterproof models offers IP65 waterproof protection

• Automatic Temperature Compensation (ATC)

• Battery operation with Low Power indicator (BEPS)

• Automatically turns off after 3 minutes of non-use

SPECIFICATIONS

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.01.0)F°1.0(C°1.0

Temperature Compensation: Automatic between 10 and 40 °C (50 - 104 °F)
Measurement Time: Approximately 1.5 seconds
Minimum Sample Volume: 100 μL (cover prism totally)
Light Source: Yellow LED
Sample Cell: Stainless Steel 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: 420 g

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PRINCIPLE OF OPERATION

Aqueous NaCl determinations are 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:

sin (θ

) = n2 / n

critical

1

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

In the HI 96821 refractometer, 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.
Specialized algorithms then apply temperature compensation to the measurement and convert the
refractive index to: g/100 g (% by mass), g/100 mL, Specific Gravity (S.G. 20/20), or °Baumé.

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FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

TOP VIEW

1. Liquid Crystal Display (LCD)

2. READ Key (User Measurement)

3. ZERO Key (User Calibration)

4. RANGE Key (User Measurement Unit)

5. ON/OFF

6. Stainless Steel Sample Well and Prism

7. Secondary Display

8. Primary Display

BOTTOM

9. Battery Cover

10.Battery Compartment

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DISPLAY ELEMENTSDISPLAY ELEMENTS

DISPLAY ELEMENTS

DISPLAY ELEMENTSDISPLAY ELEMENTS

1. Battery (blinks when low battery condition detected)

2. Measurement in Progress Tag

3. SETUP: Factory Calibration Tag

4. CAL: Calibration Tag

5. Automatic Temperature Compensation
(blinks when temperature exceeds 10-40°C / 50-104°F range)

6 Primary Display (displays measurement and error messages)

7. Temperature Units

8. Secondary Display (displays temperature measurements; when blinking,
temperature has exceeded operation range: 0-80°C / 32-176°F)

9. Range indicator

MEASUREMENT GUIDELINESMEASUREMENT GUIDELINES

MEASUREMENT GUIDELINES

MEASUREMENT GUIDELINESMEASUREMENT GUIDELINES

• Handle instrument carefully. Do not drop.

• Do not immerse instrument under water.

• Do not spray water to any part of instrument except the “sample well” located over the prism.

• The instrument is intended to measure sodium chloride solutions. Do not expose instrument or
prism to solvents that will damage it. This includes most organic solvents and extremely hot
or cold solutions.

• Particulate matter in a sample may scratch the prism. Absorb sample on soft tissue and rinse
sample well with deionized or distilled water between samples.

• Use plastic pipettes to transfer all solutions. Do not use metallic tools such as needles, spoons
or tweezers as these will scratch the prism.

• Cover sample well with hand if measuring in direct sun.

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CALIBRATION PROCEDURECALIBRATION PROCEDURE

CALIBRATION PROCEDURE

CALIBRATION PROCEDURECALIBRATION PROCEDURE

Calibration should be performed daily, before measurements are made, when the battery has
been replaced, or between a long series of measurements.

1. Press the ON/OFF key, then release. Two instrument test screens will be displayed briefly;

all LCD segments followed by the percentage of remaining battery life. It will briefly display
an indication of the measurement units set. When the LCD displays dashes, the instrument is
ready.

2. Using a plastic pipette, fill the sample well with distilled or deionized water. Make sure the
prism is completely covered.

Note: If the ZERO sample is subject to intense light such as sunlight or another strong source,

cover the sample well with your hand or other shade during the calibration.

3. Press the ZERO key. If no error messages appear, your unit is calibrated.
(For a description of ERROR MESSAGES see page 11).

Note: The 0.0 screen will remain until a sample is measured or the instrument is turned off.

4. Gently absorb the ZERO water standard with a soft tissue. Use care not
to scratch the prism surface. Dry the surface completely. The instrument
is ready for sample measurement.

Note: If instrument is turned off the calibration will not be lost.

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MEASUREMENT PROCEDUREMEASUREMENT PROCEDURE

MEASUREMENT PROCEDURE

MEASUREMENT PROCEDUREMEASUREMENT PROCEDURE

Verify the instrument has been calibrated before taking measurements.

1. Wipe off prism surface located at the bottom of the sample well. Make sure the prism and
sample well are completely dry.

2. Using a plastic pipette, drip sample onto the prism surface. Fill the well completely.

Note: If the temperature of the sample differs significantly from the temperature of the

instrument, wait approximately 1 minute to allow thermal equilibration.

3. Press the READ key. The results are displayed in unit of interest.

Note: The last measurement value will be displayed until the next sample is measured or the

instrument is turned off. Temperature will be continuously updated.

Note: The ”ATC” tag blinks and automatic temperature compensation is disabled if the

temperature exceeds the 10-40 °C / 50-104 °F range.

Note: Temperature is not displayed in °Baumé mode.

4. Remove sample from the sample well by absorbing with a soft tissue.

5. Using a plastic pipette, rinse prism and sample well with distilled or deionized water. Wipe
dry. The instrument is ready for the next sample.

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TO CHANGE MEASUREMENT UNITTO CHANGE MEASUREMENT UNIT

TO CHANGE MEASUREMENT UNIT

TO CHANGE MEASUREMENT UNITTO CHANGE MEASUREMENT UNIT

Press the RANGE key to select measurement units. The instrument toggles between the four
measurement scales each time the key is pressed and the primary display indicates “G-G” for
g/100 g, “G-L” for g/100 mL, “S.G.”
instrument displays the screen with 4 dashes, the instrument is ready for measurement. A
number on the display indicates the selected unit: “1” denotes g/100 g, “2” denotes g/100 mL,
“3” denotes Specific Gravity and “4” in the secondary display denotes °Baumé (as indicated on
the instrument cover).

Note: Temperature is not displayed in °Baumé mode.

TO CHANGE TEMPERATURE UNITTO CHANGE TEMPERATURE UNIT

TO CHANGE TEMPERATURE UNIT

TO CHANGE TEMPERATURE UNITTO CHANGE TEMPERATURE UNIT

To change the temperature measurement unit from Celsius to Fahrenheit (or vice versa), follow this
procedure.

1. Press and hold the ON/OFF key continuously for approximately 8 seconds. The LCD will

display the “all segment” screen followed by a screen with the model number on the primary
display and the version number on the secondary display. Continue pressing the ON/OFF
key.

for Specific Gravity and “bAU” for °Baumé. When the

8 seconds

2. While continuing to hold the ON/OFF key, press the ZERO key. The temperature unit will

change from °C to °F or vice versa.

°C or °F

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MAKING A STANDARD SODIUM CHLORIDE SOLUTIONMAKING A STANDARD SODIUM CHLORIDE SOLUTION

MAKING A STANDARD SODIUM CHLORIDE SOLUTION

MAKING A STANDARD SODIUM CHLORIDE SOLUTIONMAKING A STANDARD SODIUM CHLORIDE SOLUTION

To make a Standard NaCl Solution (g/100 g), follow the procedure below:

• Place container (such as a

• Tare the balance.

• To make an X NaCl solution weigh out X grams of high purity dried Sodium Chloride (CAS #:

7647-14-5: MW 58.44) directly into the container.

• Add distilled or deionized water to the container so the total weight of the solution is 100 g.

Example with g/100 g NaCl:

g/100 g NaCl g NaCl g Water g Total

10 10.000 90.000 100.000

BATTERY REPLACEMENTBATTERY REPLACEMENT

BATTERY REPLACEMENT

BATTERY REPLACEMENTBATTERY REPLACEMENT

To replace the instrument’s battery, follow these steps:

• Make sure the instrument is off.

• Turn instrument upside down and remove the battery cover by turning it counterclockwise.

• Extract the battery from its location.

• Replace with a new 9V battery making sure to observe polarity.

• Insert the back battery cover and fasten it by turning clockwise to engage.

glass vial or dropper bottle that has a cover) on an analytical balance.

WARRANTYWARRANTY

WARRANTY

WARRANTYWARRANTY

The HI 96821 is warranted for two years against defects in workmanship and materials when
used for its intended purpose and maintained according to the instructions.
This warranty is limited to repair or replacement free of charge.
Damage due to accident, misuse, tampering or lack of prescribed maintenance is not covered.
If service is required, contact your dealer. If under warranty, report the model number, date of
purchase, serial number and the nature of the failure. 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 Customer Service Department and then send it with shipment
costs prepaid. When shipping any instrument, make sure it is properly packaged for complete
protection.
To validate your warranty, fill out and return the enclosed warranty card within 14 days from the
date of purchase.

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ERROR MESSAGESERROR MESSAGES

ERROR MESSAGES

ERROR MESSAGESERROR MESSAGES

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Hanna Instruments Inc.

Highland Industrial Park
584 Park East Drive
Woonsocket RI 028985 USA

Local Sales and Customer Service office

Hanna Instruments United States Inc.

Highland Industrial Park

584 Park East Drive

Woonsocket RI 028985 USA

Tel. [phone]

Fax [phone]

www.hannainst.com/usa

Technical Support for customers

Telephone [phone]

Fax [phone]

E-mail [e-mail]

Printed in Romania, EU MAN96821 04/09

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