User Manual

PRINCIPLES OF OPERATION:
The Frigimat
®
Cub - Dry Ice Maker utilizes the Joule-Thomson effect to produce solid CO
2
from liquid CO
2
. The CO
2
enters the cavity through an
orifice and vaporizes at essentially atmospheric pressure. The chamber is cooled by the vaporizing CO
2
. The result is a progressive chilling of both the
incoming CO
2
and the dry ice maker until a temperature is reached at which the incoming CO
2
is directly converted to hard-packed carbon dioxide
snow. As more CO
2
is frozen, the snow is compressed inside the chamber to produce the solid dry ice cake.
VARIATIONS OF LIQUID CONTENT IN CO
2
:
When CO
2
cylinders are filled with gas, the cylinder pressure is maintained at between 700 and 850 psi. Under this pressure, approximately 30
percent of the cylinder volume is filled with gas while the remainder contains liquid.
The Frigimat
®
Cub - Dry Ice Maker will produce dry ice only from liquid CO
2
. The amount of dry ice which can be made is a function of the amount
of liquid present in the cylinder. This in turn, is a function of the temperature of the cylinder.
A cooler cylinder contains more liquid and thus can produce more dry ice. As the following chart indicates at 60°F (15.6°C) approximately 77%
by weight of the CO
2
is liquid. At 70°F (21°C) liquid content has decreased to 70%, while at 80°F (26.7°C) it is only 58%. If the temperature of
the cylinder is above 88°F (31°C), the critical temperature, only gas is present and dry ice cannot be made.
D I D Y O U K N O W ?
661 Route 23 South, Wayne, NJ 07470-6814 USA • TEL: 1-800-4BEL-ART • FAX: [phone] • www.belart.com