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34 I-PentaMAX System Manual 
Version 3.A 
 
Water Cooling 
Supplemental water cooling can be implemented via the camera’s back panel two 
cooling ports, either of which can be used for inflow or outflow. Connect to the ports 
using ¼
″ inner diameter Tygon tubing secured with a suitable clamp (barb-sleeve clamps 
(2518-0301) are provided). Although pressures as high as 80 psi can be applied, 
satisfactory cooling will ordinarily be attained with a lower pressure and moderate flow 
rate.
 Supplemental cooling will allow temperature lock to be achieved more rapidly than 
would be required to attain lock at the same temperature with air cooling alone. In 
addition, it will be possible to achieve temperature lock at lower temperatures, typically 
three or four degrees lower than would be possible with air cooling alone.  
It is essential that the cooling water not be chilled. The circulation of chilled water can 
cause condensation inside the camera that could cause the electronics to malfunction. 
Ordinary tap water can be too cold and should not be used! The water should be no 
colder than the laboratory ambient temperature. Closed circulation systems (such as the 
CC-100) that depend on ambient air cooling of the circulating water will generally give 
good results.  
Error Conditions 
The red ERROR indicator on the front panel of the Temperature/Power Supply will 
light when a temperature-control error condition is detected. At the same time, the 
temperature control loop will shut down independent of the setting of the Temperature 
Control On/Off switch. 
When this happens, the temperature will begin rising towards 
ambient, even though the yellow STATUS indicator remains lighted and even if the 
error condition is corrected
. It is always necessary to cycle the power before normal 
temperature control operation can be re-established. Ordinarily you would turn off the 
power, identify and correct the error condition, and then turn the power back on and 
operate as usual. Refer to Chapter 10, Troubleshooting, for possible causes and 
corrective actions. 
Note: The inside of the camera must reach a certain temperature before control can be 
re-established. You may have to wait for this to occur before regaining temperature 
control. 
Pressurization 
Before an I-PentaMAX leaves the factory, its front enclosure is evacuated and then 
backfilled with clean dry air at a pressure of nominally 1 psi. For proper operation it is 
essential that the integrity of the front enclosure be maintained. Do not remove the 
window from in front of the intensifier or loosen the pressure valve. If this enclosure 
should be opened to the air, the array and intensifier will be exposed to atmospheric 
moisture, which could condense on the array as it cools and possibly cause irreversible 
damage. If accidentally opened to the atmosphere, do not operate the camera. Contact 
Princeton Instruments Customer Support for further instructions. 
Operating an I-PentaMAX that is no longer backfilled with dry air or dry nitrogen may 
result in condensation on the array that could cause irreversible damage. Such damage 
would not be covered by the Warranty.  
CAUTION
 
WARNING!