3177885 Thelco Oven 3-1
Thermo Electron Corporation
Section 3
General Information
This instruction manual encompasses the following models and their
specific electrical characteristics.
•
Models 6540/6541, 6545/6546, 6542/6543, 6547/6548, 6544, and
6549 employ gravity convection as a method of heat transfer. Gravity
convection is defined as the natural tendency for heated air to rise due
to it's change in density and mass.
Air is drawn into the chamber through openings in the bottom of the
oven then heated as it passes over the electric heating coils and up
through the diffuser panel located on the bottom of the inner chamber.
A limited amount of the heated air is exhausted out of the chamber
through the openings in the vent cap located on the top of the oven
and the remaining air recirculates within the chamber.
Gravity convection ovens are ideal where forced air circulation cannot
be tolerated and for situations demanding gentle curing or long term
sample storage under closely controlled conditions. Gravity convection
ovens are ideal for drying powders, soil samples, paper goods,
semiconductors and cosmetics.
•
Models 6540/6541, 6542/6543, and 6544 use an analog solid state
temperature control with analog solid state safety thermostat.
•
Models 6545/6546, 6547/6548 and 6549 use a microprocessor control
with digital set point, digital display and digital safety thermostat.
•
Models 6550/6551, 6552/6553, 6554, 6555/6556, 6557/6558 and
6559 ovens use mechanical convection as a method of heat transfer.
Mechanical convection can be defined as a positive and planned
directional air flow or forced air circulation within the chamber. Air is
drawn into the chamber through a vent tube located in the bottom of
the oven and is heated as it passes over the electric heating coils. The
air is blown through the duct network and forced into the chambers
through calculated, carefully designed openings in the side diffuser
walls.
A limited amount of the heated air is exhausted out the top of the
chamber through the vent shutter cap and the remaining air
recirculates within the chamber.
