Chapter 3: System Details
© 2018 Cutting Edge Optronics, Inc.
14
Patara I and II Laser User Manual
Table 3-2. Cooling System Requirements
Chiller and Cooling System Requirements
Capable of recommended flow rate at 60 psi
1
Optishield Plus mixed with distilled water
per manufacturer’s
instructions
Filter connected between chiller and inlet on laser
3
Chiller Heat Capacity > Laser Power Consumption
Flow sensor (installed internally on Patara lasers)
4
Replace coolant and filter monthly
1
The actual operating pressure should be lower than 60 psi. It is acceptable if the chiller
can achieve the required minimum flow rate through the laser with a lower water
pressure (typically around 55 psi).
2
Clean coolant keeps coolant lines from clogging. Untreated tap water may cause
damage. Suitable coolants include: Optishield Plus from Opti Temp Inc., Traverse City,
Mich., (231) 946-2931.
3
The filter should be capable of removing particles 5 µm or larger. The filter and coolant
should be replaced each month or more frequently if the pH drops below 9 or the filter or
coolant show any discoloration.
4
When not using NG drive electronics, verify that flow sensor interrupts current to
diodes less than 500 ms after a low flow condition occurs.
Table 3-3. Avoid with Chillers
Avoid with Chillers
Deionized water
1
Iron or aluminum parts in plumbing loop
Operation below air condensation temperature
2
1
The Patara laser has exposed bare copper inside the coolant loop. For this reason,
Northrop Grumman does not recommend using untreated deionized (DI) water. If DI
water is used as the coolant, it is important to maintain the water resistivity between 300
and 700 K ohms and to keep the water slightly basic (i.e., keep the water above 8.0 pH).
2
The Patara laser is environmentally sealed, but not hermetically sealed. Atmospheric
conditions near the exterior of the laser will mimic conditions inside laser head.
