Bird Technologies 8890-400 Series - Manuale (Pagina 17)

Dielectric
Coolant and
Seal
The dielectric coolant, a low volatility, high flash point syn-
thetic oil, is used for its desirable thermal characteristics
and dielectric properties. A synthetic rubber O-Ring around
the outside of the resistor housing mount furnishes a seal
for the radiator opening. A beveled flange retains the O-
Ring which is pressed against the radiator face by the action
of drawing up on the radial V-band clamp around the
flange.
Cooling When input power is applied, the resistor generates heat
which is absorbed by the surrounding dielectric coolant. By
convection, the heated oil flows through holes in the coaxial
shell to the walls of the radiator tank. The radiator is care-
fully designed of heat-sink sections on a unique vertical
rhombic form and is fabricated into a single unit construc-
tion. This provides a very high efficiency in transferring
heat from the dielectric coolant into the surrounding air.
7
Theory of Operation