Hypertherm HD4070 Rev.8 - Manual (Page 45)

INSTALLATION
6
3-4 HD4070 Instruction Manual
Noise levels
Acceptable noise levels as defined by national or local codes may be exceeded by this plasma system. Always
wear proper ear protection when cutting or gouging. See also Noise Protection in the Safety section of this manual.
Water Purity
Conductivity Resistivity Dissolved Grains per
Water Purity µS/cm M
Ω
/cm Solids Gallon
at 77° F (25 °C) at 77° F (25 °C) (ppm of NaCl) (gpg of CaCO
2
)
Pure Water
(reference only)
0.055 18.3 0 0
Maximum Purity 0.5 2 0.206 0.010
Minimum Purity 18 0.054 8.5 0.43
Max. Potable Water
(reference only)
1000 0.001 495 25
Torch Lifter Requirement
The HD4070 system requires a high-quality, motorized torch lifter with sufficient travel to cover all cutting thickness
requirements. The lifter must provide 8 inches (203 mm) of vertical travel. The unit should have the capability of
maintaining a constant speed of up to 200 ipm (5080 mm/min) with positive braking. A unit which drifts through the
stop point is not acceptable.
Water Purity Requirements for Coolant Mixture
Maintaining a low level of calcium carbonate is critical for proper performance of the torch and components in the
cooling system. Water purity should meet the requirements defined in the table below, When mixing Hypertherm
coolant (P/N 028873 - 100% propylene glycol) with water to create the appropriate coolant mixture.
Note: If water purity exceeds maximum levels, mineral deposits may occur throughout the system.
If water purity is below minimum levels, soluble materials may leach into the coolant..