2
3.
GENERAL INFORMATION
3.01
This instruction manual encompasses
the following models and their specific electrical
characteristics.
3.02
Models 14EG, 25EG and 45EG 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.
3.02.1
Air is drawn into the chamber through
openings in the bottom of the oven and then
heated as it passes over the electric heating
coils and up through the openings in the diffuser
panel located on the bottom of the inner chamber.
A limited amount of heated air is exhausted out
of the top of the chamber through the vent shutter
cap and the remaining air recirculates within the
chamber.
3.02.2
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.
3.03
Models 25EM and 45EM 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.
3.03.1
Air is drawn into the chamber through
vent tubes located in the bottom of the oven and
is heated as it passes over the electric heating
coils. The air is blown through openings in the
bottom of the inner chamber. A limited amount
of heated air is exhausted out the top of the
chamber through the vent shutter cap and the
remaining air recirculates within the chamber.
3.03.2
Mechanical convection ovens provide
the most efficient means of heat transfer as well
as the most reproducible test conditions for
repeat operations. Mechanical convection
allows for rapid heat up time for high density
loads, shortened recovery periods after door
openings and improved uniformity for extremely
heat sensitive samples.
3.04
All models use a hydraulic thermostat for
temperature safety limit control.
