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Compressor Cooling

Dry Ice Cooling

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Cooler Temperature Performance Guide

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Dry Ice Cooling
Liquid Nitrogen Cooling
COMPRESSOR COOLING Products for Research Compressor Cooled Photomultiplier, Vidicon, and Image Intensifier Tube Chambers offer temperature controllable operation from ambient to -50°C. without the use of supplemental cooling materials and are often used in remote locations which do have 115V or 220V, 50/60 hz available.

The standard unit is designed to operate only at its minimum temperature of -50°C. All units are also available with Digital PID Temperature Control to cover the setpoint range from ambient to -50°C.

As with all Products for Research Photomultiplier Housings, these Compressor Cooled Photomultiplier Housings are supplied complete and ready for use and can be operated in any plane.

These Products for Research housings are of necessity large in cross section to provide adequate thermal insulation. However, the specially designed front mounting surfaces provide rigid, flex free operation even while the unit is being moved through significant arcs.

The standard flexible coolant line is 5 ft. (1.5m) in length and comes equipped with a specially designed coupling device which permits the compressor to be separated from the chamber for ease of transportation and installation. For astronomical or other applications requiring remote compressor location, a total of up to 25 ft. (7.6 m) of coolant line is available on special order. The flexible coolant line isolates the housing from any compressor vibration and the noise level of the compressor is about 1.5 sones. (1 sone is approximately equal to the sound of a modern household refrigerator in a quiet kitchen).


 

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Compressor Cooling
Liquid Nitrogen Cooling
DRY ICE COOLING Products for Research Dry Ice (solid CO2) Cooled Photomultiplier Housings are principally designed for applications where coolant lines could be a hinderance and for detectors which would perform better at these lower temperatures.

The maximum cold holding period after initial cool down is achieved using high density crushed Dry Ice as the coolant. Low density Dry Ice, such as can be obtained from a CO2 type fire extinguisher, will require more frequent recharging. In addition, due to the high content of water ice in low density Dry Ice which acts as a thermal insulator, the operating temperature will be somewhat warmer than with high density Dry Ice.

The unique design of the Dry Ice holding compartment in these Products for Research Cooled PMT Housings permits operation in any plane without loss of coolant or temperature stability.

Because the coolant is consumed during operation, all Products for Research Dry Ice Chambers are provided with a dial thermometer which serves as an indicator when the chamber is in need of recharging with dry ice. Resistive temperature sensors are also available.

Products for Research Dry Ice Cooled PMT Housings are of necessity large in cross section to provide adequate thermal insulation, and heavy when fully charged with Dry Ice. However, the specially designed front mounting surfaces provide rigid, flex free operation even while the unit is being moved through significant arcs.

These Products for Research Cooled Photomultiplier Housings are widely used in laboratories and astronomical observatories, as well as in airborne applications.


 

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Compressor Cooling
Dry Ice Cooling
LIQUID NITROGEN COOLING Based on Frost Free Cold Zone technology developed at Products for Research, highly efficient cooling using controlled LN2 flow provides variable temperature PMT coolers useable over the setpoint range from ambient to -100°C.

Using the Products for Research Digital PID Temperature Control, the temperature is maintained within 0.1°C over the entire range, and is ideal for detectors whose performance continually improves with cooling, as well as any detector that benefits from cooling. Large heat loads can also be conveniently handled by these Products for Research Photomultiplier Housings and other LN2 cooling devices.

These Photomultiplier Housings are provided complete with the necessary transfer system which includes all the necessary valves, 5 ft. (1.5 m) of insulated coolant line and, in the case of unpressurized dewar systems, the necessary probe to extract the LN2.

These Products for Research PMT Housings are of necessity large in cross section to provide adequate thermal insulation. However, the specially designed front mounting surface provides rigid, flex free operation.

Because the coolant is consumed during operation, all Products for Research LN2 chamber power supplies are provided with an alarm which serves as an indicator that the LN2 supply must be replenished. The alarm also provides overtemperature, undertemperature and sensor failure warning signals.

All Products for Research LN2 chambers can be used with either self pressurizing or non-self pressurizing dewars. However, due to special valving requirements in each case, the type of dewar to be used must be specified at the time of order. If not specified, the standard valving supplied is for non-self pressurizing dewars.


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Cooler Temperature Performance Guide with links to POWER Index
Typical Cathode Temperature
at 20 °C Ambient Air or Liquid
Cooler Series
0 °C T.E. Convection
-20 °C T.E. Air
-25 °C T.E. Liquid
-30 °C T.E.Air Econo Multi-Stage
-35 °C T.E. Liquid Econo Multi-Stage
  

 
Typical Cathode Temperature
at 20 °C Ambient Air or Liquid
Cooler Series
-35 °C T.E.Air Multi-Stage
-40 °C T.E. Liquid Multi-Stage
-50 °C T.E. Liquid Enhanced Multi-Stage
-50 °C Compressor
-75 °C Dry-ice
ambient to -100 °C LN2

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