Hypertherm MAX200 Machine Torch Plasma Arc Cutting System - Manual (Page 34)

3-6 MAX200 Instruction Manual
14
SETUP
Torch Coolant Requirements
The power supply is shipped without any coolant in the tank. A standard mixture of propylene glycol (30%),
deionized water (69.9%) and 0.1% benzotriazole is recommended. This mixture resists freezing to +10° F (-12° C)
and contains a corrosion inhibitor (benzotriazole) to protect copper surfaces in the coolant loop. This mixture is
available in one-gallon containers by ordering 028872. 100% propylene glycol is available by ordering 028873.
For operating temperatures colder than the temperature stated above, the percentage of propylene glycol must be
increased. Refer to graph below. Failure to do so could result in a cracked torch head, hoses, or other damage to
the torch coolant system due to the coolant freezing.
Observe the warning and cautions below. Refer to the Material Safety Data Sheets in Appendix B for data
on safety, handling, and storage of propylene glycol and benzotriazole.
WARNING
Propylene glycol and benzotriazole are irritating to skin and eyes, and harmful or fatal if
swallowed. Upon contact, flush skin or eyes with water. If swallowed, drink water and call a
physician immediately. Do not induce vomiting.
Caution: Always use propylene glycol in the coolant mixture. Do not use anti-freeze in place
of propylene glycol. Anti-freeze contains corrosion inhibitors that will damage the
torch coolant system.
Always use purified water in the coolant mixture in order to prevent corrosion in the
torch coolant system. The hardness of purified water should be between .206 and
8.5 ppm. If using a conductivity meter to measure water purity, the recommended
level is between .5 and 18 µSiemens/cm at 77° F (25° C).
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
0 10 20 30 40 50 60
32 °F (0 °C)
10 °F (-12 °C)
(mixture resists
freezing to this
temperature)
Propylene Glycol (%)
T
emperature °
F