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DUKE Soft Serve Freezer Model 927CMT
10.3 Product Temperature
The product temperature should be
measured by a calibrated thermometer.
If you suspect that the thermometer is
out of calibration, test it by filling a cup
with ice and water and inserting the
thermometer into it. After a few minutes,
the thermometer should read exactly
32°F (0°C). The freezer should maintain
a product temperature variation of only
1½°F (1°C) on a product temperature
between 17° and 19°F (-8° and -7°C).
10. 4 Overrun
As mix is being frozen in the freezing
cylinder, air is incorporated into the mix
to increase its volume as well as the
taste and appeal of the finished product.
The increase in volume is called
over-
run
. Forty five percent overrun means a
volume increase of 45%—10 gallons of
liquid mix has become 14.5 gallons of
finished product.
Controlled overrun is important in
maintaining consistency in product
quality. Too much overrun (air) results in
a light, fluffy product lacking the cold,
refreshing appeal of a quality product.
Too little overrun results in a grainy,
heavy product.
To correctly measure the overrun:
1.
Take a pint container and adjust
your scale to zero with the container
on the scale.
2.
Fill the container with liquid product
even with the top of the container
and record the weight.
3.
Then fill the container with frozen
product, leaving no voids or air
spaces in the container. Strike off
the excess product so it is even with
the top of the container and weigh it.
4.
Use the following formula to figure
overrun percentage:
Weight of liquid mix minus weight of
frozen product. Divide the difference by
the frozen weight.
Example:
Weight of one pint of mix =
18 oz.
Weight of one pint frozen product = 12 oz.
Difference
6 oz.
6.0 oz. divided by 12 oz. = .5
.5 x 100 = 50% overrun
H. C. Duke and Son, Inc. can provide a
scale (part #158049) that is graduated in
overrun percentage.
Section 10.7 is an overrun chart which
shows the net weight of one measure pint
of frozen Dairy Queen
®
product in grams,
ounces, and their corresponding percent-
age of overrun.
