make a wide range of heat switch designs for a variety of uses,
including bespoke designs to meet individual customer requirements.
There are two broad categories of heat switch:
These have an external absorber activated by a heater element,
typically used for systems that are cycled under user control.
have an internal absorber and automatically turn off when they cool.
They are typically used for the rapid cool-down and subsequent thermal
isolation of items of equipment.
Both kinds of heat switch can
be filled with either 3He or 4He gas, depending on the temperature
range over which operation is required.