Flow requirements for coolant
The correct coolant flow rate is necessary for cutting system operation. If the flow rate is too low or too
high, the system will stop automatically to prevent damage.
■
The maximum coolant flow rate is 11.36 liters per minute (3.0 US gallons per minute).
■
The minimum coolant flow rate is calculated based on coolant temperature. As coolant temperature
increases, the minimum flow rate also increases. It ranges from 2.50 liters per minute (0.7 US gallons
per minute) to 4.92 liters per minute (1.3 US gallons per minute).
The cutting system stops automatically if the flow rate reaches the maximum or minimum flow rate.
Automatic, low-flow shut-off protects the coolant pump from damage from low-flow or no-flow conditions.
Automatic, high-flow shut-off protects the torch and leads from damage from a blow-out event.
For information about how to diagnose and troubleshoot coolant flow issues, refer to:
■
Troubleshooting for low coolant flow on page 326
■
Troubleshooting for high coolant flow on page 328
Purity requirements for coolant water
Always use water that meets the specifications in the following table when using a custom coolant mix.
Water that is too pure can also cause problems. Deionized water can cause corrosion in the coolant
system. After deionization, add benzotriazole (128020).
Use water purified by any method, such as deionization, reverse osmosis, sand filters, or water softeners,
as long as the water purity meets the specifications in the following table. Speak with a water specialist for
advice in choosing a water filtration system.
Table 16 - Purity measurement methods for coolant water
Water purity level
Conductivity μS/
cm at 25°C (77°F)
Resistivity mΩ∙cm
at 25°C (77°F)
Dissolved solids
or hardness (ppm
of NaCl)
Grains per gallon
(gpg of CaCO
2
)
Pure water
(For reference only. Do not use.)
0.055 18.3 0 0
Maximum purity 0.5 2 0.206 0.010
Minimum purity 18 0.054 8.5 0.43
Maximum potable water (For
reference only. Do not use.)
1,000 0.001 495 25
Qualifications and Requirements
2
60
811530 Instruction Manual XPR460
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