Amptek COOL-X Manuale operativo - Pagina 8

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AMPTEK INC.

COOL-X Operating Manual

APPENDIX A

Operation of the COOL-X away from its Controller

The Amptek COOL-X, x-ray generator is designed to be used as an integrated unit together with

its Controller in normal room temperature applications 20

C ±5

C. Operating the unit outside

these temperature conditions may result in faulty operation or damage to the COOL-X emitter.

In normal operation, the COOL-X cycles through heating and cooling phases. Heat-sinking of

the emitter head (TO-8 package) to provide the proper cooling profile is accomplished by having

good thermal contact with the COOL-X Controller housing. Normal air convection is usually

adequate to dissipate the heat from the housing, but performance can be improved by attaching

the housing to a metal plate with 4 screws.

Operation of the COOL-X emitter (TO-8) away from its Controller must be done very carefully,

taking into account the following considerations:

1) Heat-sinking:

The TO-8 emitter head must be mounted on a heat-sink which is kept at room temperature. The

hole pattern for the TO-8 for attaching it to the heat-sink is provided below. The Control

electronics should also be mounted on a metal plate and kept at approximately the same

temperature as the TO-8. This is important because the temperature sensor in the Control circuit

refers to a matched temperature sensor inside the TO-8 emitter head in order to maintain the

proper temperature differentials and temperature limits throughout the heating and cooling

phases of the cycle.

2) Grounding:

The temperature sensor inside the TO-8 emitter head has a normal output voltage in the range of

0.560 to 0.410 volts corresponding to temperatures of 35 to 125°C. The temperature sensor

shares a common ground with the crystal heater which normally draws about 400 mA of current

during the heating phase. It is important to maintain a low impedance Ground return between

the TO-8 (Pin 11) emitter housing and the Controller circuit board ground (4 corner screws) to

prevent overheating or damage to the emitter. A 60 millivolt difference between the two grounds

will result in a 40°C error in the temperature sensor. This may likely result in damage to the

emitter AND VOID WARRANTY.

TO-8 EMITTER MECHANICAL DIMENSIONS

All dimensions are in inches except as noted.

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