Cooling
Circuit/Mechanical Descriptions
There are two separate and unrelated cooling functions: for the X-ray tube, and for the CCD camera.
X-ray Tube Cooling
The X-ray Tube used on the 9800 C-Arm has a rotating anode and two filaments. In operation, the filaments and rotating anode
generate heat as X-Rays are produced. The Anode heat capacity is 300,000 Heat Units (H.U.) and heat dissipation is 60,000
H.U./minute. X-ray Tube Housing storage capacity is 1,600,000 H.U. and heat dissipation is 15,000 H.U./minute. If the heat
generated exceeds the heat dissipation because of constant use, some means of monitoring and removing the excess heat must
be employed. The X-Ray tube is enclosed in a case that is filled with oil. The oil provides rapid removal and dissipation of the
tube-generated heat.
A thermistor is used to monitor X-ray Tube temperature. A Thermal Switch is used as additional protection in case the thermistor
or associated circuitry fails. Both components are shown in the following illustration.
The thermal switch protects the tube from excessive heat and pressure. The contacts are normally closed, but they open if the
temperature exceeds 181° ± 5° F. The switch is located on the side of the X-ray Tube.
2
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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