Precision II Operation and Maintenance Manual
3-84
C
996-0255 rev. b
The small opening in the top of the reservoir just behind the DI cartridge
is for filling the reservoir with DI water.
Refer to the front panel drawing and the "Resistivity" light. This is set at
500 KΩ.cm. The light will be yellow at startup. After a warm-up period of
10-20 minutes this light will turn off when the water resistivity is good. If
this light stays yellow after a reasonable warm-up period, then the DI
cartridge needs to be replaced.
Also on the front panel is the POWER ON light, temperature gauge, fill/
drain spout and a water level window.
There is a heater option which is used to decrease the warm-up time and
is rated at ≈600 watts. The heater is independent of the security inter-
locks.
3. Principle of Operation
DI water is pumped from the reservoir through the laser heads. The
water required for each round trip then flows out of the laser heads in
series and then returns to the unit where it is cooled down again with tap
water. The temperature regulator uses a proportional valve to keep the
DI water at ±1°C. The cooling group has three security interlocks; a flow/
pressure sensing switch, a DI temperature switch and a liquid level
switch. The water pressure switch is set for 1GPM. These interlocks are
connected with the other electronics subsystems in order to prevent
damage in the event of cooling system failure.
Unit requirements:
a) A grounded AC source at 208-240 V, 1 phase
b) A 3 gallon supply of DI water
c) A tap water flow of 3-4 gal/min. at 40-60 PSI for the
CG604C
d) A tap water temperature of <70°F (21°C).
4. Connections
a) 220 Vac - plug in power cord from I/O panel in bottom of
cabinet (see drawing p. 3-15)
b) F1 & F2 - fuses
c) to CU - receptacle for CU security cord
d) GND - grounding strap
e) DI water to laser - line from here takes chilled water to
laser bench
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