Instruction Manual HI 96832 Propylene 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 96832 Digital Refractometer is a rugged portable, water resistant device that utilizes the measurement of refractive index to determine the % volume and freezing point of propylene glycol based solutions. Propylene glycol is used in many applications including: • pharmaceutical solvent • humectant food additive • emulsification agent • moisturizer in cosmetics, toothpaste, tabacco products, etc.
Battery Type / Life: Auto-Off: Dimensions: Mass: 1 X 9V / 5000 readings After 3 minutes of non-use 19.2(W) x 10.2(D) x 6.7(H) cm 420 g PRINCIPLE OF OPERATION Propylene 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.
MEASUREMENT UNITS Freezing point is displayed as a temperature from 0.0 to -51.0 °C corresponding to 0-60 % by volume. When the display shows “LO”, the freezing point is at a minimum (below -51 °C). FUNCTIONAL DESCRIPTION TOP VIEW 1. 2. 3. 4. 5. 6. 7. 8.
BOTTOM VIEW 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 propylene 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 Propylene Glycol Solution, follow the procedure below: • To make an X % propylene glycol solution volumetrically add X mL of high purity propylene glycol (CAS #: 57-55-2; MW 76.09) 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 Technical Support for Customers Tel. (800) 426 6287 Fax (401) 765 7575 E-mail tech@hannainst.com www.hannainst.
