3.INSTALLATION B-70315EN/02
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3.2.2 Cooling Water
3.2.2.1 Specification of the cooling water
The quality of cooling water is specified in the table below. Use pure
water or tap water passed through an ion exchanger.
pH (25°C) 6.0 to 8.0
Conductivity (25°C) 200µS/cm or less
Chlorine ion Cl
-
20ppm or less
Sulfate ion SO
4
2-
50ppm or less
M alkalinity CaCO
3
50ppm or less
Standard
item
Total hardness CaCO
3
50ppm or less
Iron Fe 0.3ppm or less
Sulfur ion S
2-
Not to be detected
Ammonia ion NH
4
+
0.2ppm or less
Reference
item
Ionic silica SiO
2
30ppm or less
3.2.2.2 Pure Water Supply Unit
Install a pure water supply unit (ion exchange resin) at the water inlet
of the chiller. The pure water supply unit can prevent problems with
the oscillator from occurring due to corrosion or a clogged pipe.
Replace the water periodically after every 1,500 hours because the
quality of the circulating cooling water is lowered.
Product name:
Pure Water Supply Cartridge
Manufacturer:
ORGANO Corporation
Use:
Refer to the description indicated on the product.
3.2.2.3 Cooling water piping
The pressure of 0.5MPa or less hangs to the water piping connected
with the laser oscillator, and lay down the piping that can endure this
hydraulic pressure enough.
Moreover, install the stop valve to prevent the water leak by the
operation of an unexpected chiller in the vicinity of the doorway of
the water of the laser oscillator when the cooling water system is
opened by maintenance etc.