Hanna Instruments HI 96831 User manual

HI96831
Ethylene Glycol Refractometer
INSTRUCTION MANUAL

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 informa‑
tion 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,

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Preliminary Examination ........................................................
General Description................................................................
Specifications........................................................................
Principle of Operation............................................................
Measurement Units...............................................................
Functional Description............................................................
Display Elements...................................................................
Measurement Guidelines........................................................
Calibration Procedure.............................................................
Measurement Procedure.........................................................
To Change Measurement Unit.................................................
To Change Temperature Unit .................................................
Making a Standard Solution..................................................
Battery Replacement.............................................................
Error messages............................................................................
Accessories............................................................................
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TABLE OF CONTENTS
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Remove the instrument from the packing materials and examine
carefully to ensure no damage has occurred during shipping. If any
damage has occurred, please contact your local Hanna Instruments
Office.
Each HI96831 instrument is supplied with:
• 9 V battery
• Instruction manual
• Plastic pipette
• Quality Certificate
Note: Save all packing material until you are sure that the
instrument functions correctly. A defective instrument must be
returned in its original packing.
PRELIMINARY EXAMINATION

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The HI96831 Digital Refractometer is a rugged portable, water
resistant device that utilizes the measurement of refractive index to
determine the % volume and freezing point of ethylene glycol based
coolants or antifreeze.
The HI96831 device benefits from Hanna Instruments’ years of experi‑
ence as a manufacturer of analytical instruments. The digital
refractometer eliminates the uncertainty associated with mechanical
refractometers and is easily portable for use in the field to optimize
your cooling system.
The HI96831 refractometer is an optical device that is simple and
quick to use. Samples are measured after a simple user calibration
with distilled or deionized water. Within seconds, the refractive
index and temperature are measured and converted into one of two
measurement units; % Volume or Freezing Point. The instrument
utilizes internationally recognized references for unit conversion and
temperature compensation for ethylene glycol solutions (e.g. CRC
Handbook of Chemistry and Physics, 87th Edition).
The temperature (in °C or °F) is also displayed on the large dual level
display along with helpful message codes.
Key features include:
• IP65 waterproof protection
• Automatic Temperature Compensation (ATC)
• Battery operation with Low Power indicator (BEPS)
• Automatically turns off after 3 minutes of non‑use
GENERAL DESCRIPTION

Range
% Volume : 0.0 to 100.0 % V/V
Freezing point: 0.0 to ‑50.0 ºC
(32.0 to ‑58.0 ºF)
ºC (ºF): 0.0 to 80.0 ºC (32.0 to
176.0 ºF)
Resolution
% Volume: 0.1 % V/V
Freezing Point: 0.1 ºC (0.1 ºF)
ºC ( ºF): 0.1 ºC (0.1 ºF)
Accuracy
%Volume: ±0.2% V/V
Freezing Point: ±0.5 ºC (±1.0 ºF)
ºC ( ºF): ±0.3 ºC (±0.5 ºF)
Temperature
Compensation
Automatic between 10.0 and 40.0 ºC
( 32.0 ‑ 104.0 ºF)
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 IP65
Battery Type / Life 9V/ 5000 readings
Auto‑Off After 3 minutes of non‑use
Dimensions 192 x 102 x 69 mm (7.6 x 4.1 x 2.7 ")
Weight 350 g (12.3 oz.)
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SPECIFICATIONS

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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
travelsthroughasubstanceofdifferentrefractiveindex.Thisiscalledrefraction.
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 (θcritical) = n2/ n1
Wheren2istherefractiveindexofthelower‑densitymedium;n1istherefractive
index of the higher‑density medium.
In the HI96831 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 measu‑
rement and convert the refractive index to: % Volume or Freezing Point.
PRINCIPLE OF OPERATION

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Freezing point is displayed as a temperature from 0.0 to ‑ 50.0 °C cor‑
respondingto0‑58%byvolume.Thedisplayblinksthefreezingpointwhenthe
concentrationofEthyleneglycolisgreaterthan78%concentrationbyvolume.
When the display shows “LO”, the freezing point is at a minimum (below
‑50 °C).
MEASUREMENT UNITS

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1. Liquid Crystal Display (LCD)
2. Secondary Display
3. Primary Display
4. READ Key (User Measurement)
5. ZERO Key (User Calibration)
6. RANGE Key (User Measurement Unit)
7. ON/OFF
8. Stainless Steel Sample Well and Prism
TOP VIEW
9. Battery Cover
10. Battery Compartment
BOTTOM
FUNCTIONAL DESCRIPTION

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• 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 ethylene glycol 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
with a 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.
MEASUREMENT GUIDELINES
1. Battery (blinks when low battery condition detected)
2. Primary Display (displays measurement and error messages)
3. Measurement in Progress Tag
4. SETUP: Factory Calibration Tag
5. CAL: Calibration Tag
6. Measurement Unit
7. Automatic Temperature Compensation
(blinks when temperature exceeds 0.0‑40.0 °C / 32.0‑104.0 °F range)
8. Temperature Units
9. Secondary Display (displays temperature measurements; when
blinking, temperature has exceeded operation range: 0.0‑80.0 °C /
32.0‑176.0 °F)
DISPLAY ELEMENTS