Instruction Manual HI 96831 Ethylene Glycol Refractometer w w w. h a n n a i n s t .
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 tech@hannainst.com. TABLE OF CONTENTS PRELIMINARY EXAMINATION ............................................................................................. 2 GENERAL DESCRIPTION ...................................................
GENERAL DESCRIPTION The HI 96831 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 HI 96831 device benefits from Hanna’s years of experience as a manufacturer of analytical instruments.
PRINCIPLE OF OPERATION Ethylene Glycol 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.
MEASUREMENT UNITS Freezing point is displayed as a temperature from 0.0 to -50.0 °C corresponding to 0-58 % by volume. The display blinks the freezing point when the concentration of Ethylene glycol is greater than 78 % concentration by volume. When the display shows “LO”, the freezing point is at a minimum (below -50 °C). FUNCTIONAL DESCRIPTION TOP VIEW 1. 2. 3. 4. 5. 6. 7. 8.
BOTTOM 9. Battery Cover 10.Battery Compartment DISPLAY ELEMENTS 1. 2. 3. 4. 5. 6. 7. 8. 9.
MEASUREMENT 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 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.
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 the instrument is turned off the calibration will not be lost.
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. TO CHANGE MEASUREMENT UNIT Press the RANGE key to select the measurement units. The instrument toggles between the two measurement scales each time the key is pressed and the primary display indicates “Vol” % Volume or “FrPt” for Freezing Point.
MAKING A STANDARD SOLUTION To make a Ethylene Glycol Solution, follow the procedure below: • To make an X % ethylene glycol solution volumetrically add X mL of high purity ethylene glycol (CAS #: 107-21-1; MW 62.068) to a 100 mL Grade A volumetric flask. • Use distilled or deionized water to bring the flask close to the total volume, mix, allow the solution to return to room temperature.
ERROR MESSAGES Error Code LCD Descript ion “Err“ G e n e ra l f a i l u re . C y c l e p owe r t o instrument. If error p ersists, conta ct Ha nna . “LO“ Prima ry d isp la y Sa m p l e exceed s m i n i m u m mea surement ra ng e. “HI “ Prima ry d isp la y Sa m p l e exceed s m a xi m u m mea surement ra ng e. “LO“ Prima ry d isp la y “CAL“ seg ment ON W ron g sol u ti on u sed to zero i n stru m e n t. U se d e i on i ze d or d istilled wa ter. Press ZERO.
Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Local Sales and Customer Service office Hanna Instruments United States Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Tel. (800) 426 6287 Fax (401) 765 7575 www.hannainst.com/usa Technical Support for customers Telephone (800) 426 6287 Fax (401) 765 7575 E-mail tech@hannainst.
