PR120H
User’s manual
Version: 1
Page: 6 of 14
Date: 2023.01.19
Safety Labels
The symbols used on the machine were developed by the International Organization for Standardization (ISO)
and are defined below. These symbols may include yellow warnings triangles, blue mandatory action circles,
or red prohibited action circles.
Danger of Suffocation
Dry ice pellets are CO
2
in solid form. At ordinary atmospheric pressure, CO
2
can only exist in this solid form at
temperatures of -79°C (-110°F) or lower. Therefore, during dry ice production, the CO
2
will immediately be heated and
thus transform from solid form into gas form.
Please note:
Since the specific gravity of CO
2
is higher than that of ordinary atmospheric air, the air with its contents of oxygen will be
replaced by CO
2
if the dry ice production is taking place in small or insufficiently ventilated rooms.
Therefore, please note the following:
1. Low CO
2
concentrations (3-5%) may cause headaches and rapid breathing.
2. CO
2
concentrations of (7-10%) may cause headaches and nausea and may result in unconsciousness.
3. Higher CO
2
concentrations will result in unconsciousness and suffocation.
High CO
2
concentrations may result in unconsciousness due to the displacement of oxygen. Therefore, always provide
sufficient ventilation of the working area, and avoid producing dry ice in small rooms.
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