Milwaukee MR32ATC User manual

MR32ATC - Brix Refractometer
Specifications
Scale Range Resolution
Brix scale: 0 - 32
Dimensions 7.6 x 1.5 x 1.5" (194 x 38 x 38mm)
Weight Approx. 8.0 oz. (227g)
Shadow-line Æ
Operation
This instrument measures the refractive index of the sample and displays the result in Brix scale.
1. Zero Adjustment
Put distilled water on the prism; enough to cover the entire prism. Close the cover plate and rotate
the adjusting screw so that the light/dark boundary line (known as the shadow-line) evens up with
the zero line. After the zero adjustment, clean the prism with soft cloth.
2. Sample Preparation and Reading
To take a reading, place a few drops of a sample liquid on the measurement prism. Ensure that
enough solution is added to the prism in order to cover the entire prism. Close the prism so that
the liquid spreads across the entire surface of the prism without air bubbles or dry spots (see
diagrams below). Allow the sample to remain on the prism for approximately 30 seconds. While
holding the instrument under a light source (do not use florescent light) look through the
eyepiece. The brix concentration is determined by the intersection of the boundary of the light
and dark fields (known as the shadow-line) on the printed scale. If the scale appears out of focus,
the eyepiece may be adjusted by rotating the knurled portion. The instrument also features an eye
guard to prevent stray light from entering the eyepiece and causing reflections. It may be
necessary to adjust the position of the light source to maximize the contrast of the shadow-line.
Under normal conditions, optimal contrast is obtained by holding the instrument underneath and
perpendicular to a light source. (florescent light is not recommended) - Once a reading has been
taken, wipe dry with a clean cloth (do not wash or rinse) and place the instrument in the supplied
plastic case. Store the instrument in a safe, dry environment.

Temperature is the single most important factor influencing refractometer readings and is one of
the largest sources of measurement error. However, this device incorporates automatic
temperature compensation (ATC) and the concern for temperature fluctuations in sample
liquids is alleviated. When ambient temperature varies from 68°F (20°C), readings are
automatically adjusted to compensate for temperature variance between 50°F to 86°F (10°C to
30°C).
Liquid on lens display
Refractometer Brix Scale
FRUITS Poor Average Good Excellent VEGETABLE Poor Average Good Excellent
Apple 6 10 14 18 Asparagus 4 6 8 10
Avocado 4 8 16 22 Beet 6 8 12 14
Banana 8 10 12 16 Bell Pepper 4 6 8 12
Blueberry 8 10 12 18 Broccoli 6 8 10 12
Cantalope 8 12 14 16 Cabbage 6 10 12 14
Casaba 6 8 14 16 Carrot 4 8 14 18
Cherry 6 8 14 16 Cauliflower 4 6 8 10
Coconut 4 12 14 16 Celery 4 6 10 12
Grape 8 12 18 22 Corn, Stalk 4 10 16 22
Grapefruit 6 10 14 16 Corn, Young 6 10 18 24
Honeydew 8 10 14 16 Cow Peas 4 8 12 14
Kumquat 4 6 10 12 Endive 4 6 10 12
Lemon 4 6 10 14 Escarole 4 6 10 12
Lime 4 6 10 12 English Peas 8 10 12 14
Mango 4 6 10 16 Field Peas 4 6 10 12
Orange 8 10 16 20 Green Peas 4 8 10 12
Papaya 8 12 18 24 Hot Peppers 4 6 8 10
Peach 8 10 16 20 Kohlrabi 6 8 10 12
Pear 8 10 14 16 Lettuce 4 6 8 10
Pineapple 12 14 20 22 Onion 4 8 10 12
Raisins 65 75 78 85 Parsley 4 6 8 10
Raspberry 6 8 12 14 Peanut 4 6 8 10
Strawberry 8 12 16 18 Potato, Irish 3 5 7 10
Tomato 4 6 10 14 Potato, Red 3 5 7 10