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118157-001 Rev C
Cooler/Chiller Connections:
The X-ray tube requires cooling to prevent damage. Single ended or unipolar tubes require a water
circulation system in order to cool the tube while a double ended or bipolar x-ray tube requires a chiller
and oil cooling. Depending on the power rating for the X-ray tube, the manufacturer will recommend a
specific flow rate and the cooling medium for the tube. A typical cooler will have a water fill cap, water
drain plug, water inlet and outlet flow connections, power input connections and interlock connections.
A typical cooler is illustrated below.
In some environments it may be necessary to mix glycol with the water in order to prevent freezing
should the ambient temperature drop. Allow sufficient space for the unit when installing for air
circulation. The manufacturer normally recommends the minimum distance required and the mixture
for glycol to water for specific temperature ranges. The water outlet connection is water that flows to
the x-ray tube anode while the water inlet connection returns from the X-ray tube anode. Although the
cooler may provide temperature indicators and over temperature switches, it is important for the
correct water flow configuration from the tube to the cooler. Failure to do so may result in overheating
and tube damage. Below is a typical symbol for inlet and outlet water connections.
Various hose connections may be used for the water connections. Some are quick disconnecting while
others either use threads or hose clamps. Consult Spellman High Voltage when ordering the cooler for
more information regarding connectors. If the I/O Box is purchased with the sub-system, a circuit
breaker will be provided for the cooler. If the I/O Box is not a part of the sub-system, then the user will
be responsible for the correct breaker installation. Typically a cooler will require a 7.5 Amp. double pole
breaker. Consult Spellman High Voltage for sizing the breaker.
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