Product Temperature; Overrun; Overrun Measurement - H.C Duke & Son 959R Operator’s Manual With Illustrated Parts List

DUKE Model 959R Soft Serve Freezer
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Product Temperature

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The product temperature should be mea-
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sured by a calibrated thermometer . If you
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suspect that the thermometer is out of
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calibration, test it by filling a cup with ice
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and water and inserting the thermometer
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 into it. After a few minutes, the thermometer
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 should read exactly 32°F (0°C).
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The freezer should maintain a product
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temperature variation of only 1.5°F (1°C) on
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a product temperature of 18°F (-8°C).
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10.4

Overrun

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As mix is being frozen in the freezing
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cylinder, air is incorporated into the mix to
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increase its volume, as well as enhance the
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taste and appeal of the finished product. The
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increase in volume is called overrun. Forty
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five percent overrun means a volume in-
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 crease of 45% — 10 gallons of liquid mix
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has become 14.5 gallons of finished product.
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Overrun Measurement

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To correctly measure the overrun, perform
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the following steps:
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1. Place an empty pint container on a
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2. Remove container from scale and fill the
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3. Now fill the container with frozen prod-
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4. Strike off the excess product so it is
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5. Use the following formula to figure
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"Weight of liquid mix minus weight of frozen
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product/divided by the frozen weight. Multiply
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by 100."
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30
scale* and adjust your scale to zero.
container with liquid mix, even with the
top of the cont a iner, and record the
weight.
uct, being sure to leave no voids or air
spaces in the cont a iner.
even with the top of the container and
weigh.
overrun percentage:
Controlled overrun is important in maintain-
ing consistency in product quality . Too
much overrun (air) results in a light, fluffy
product lacking the cold refreshing appeal of
a quality product. T oo little overrun results in
a grainy, heavy product.
Example:
Weight of 1 pint of liquid mix
Weight of 1 pint
frozen product
Difference
6.0 oz. divided by 12 oz.
.5 x 100 = 50% overrun
* A scale (P/N HC158049) that is gradu-
ated in overrun percentage can be
purchased from H. C. Duke & Son.
On the next page is an overrun
chart that shows the net weight of
one measure pint of frozen "Dairy
Queen" product in grams and
ounces, and their corresponding
percentage of overrun.
= 18 oz.
= 12 oz.
= 6 oz.
= .5
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