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The Hearson
Tobacco Oven
The Hearson Tobacco
Oven has been designed to meet the stringent requirements
of the industry for moisture testing. The oven provides a
continuous flow of pre-heated air which passes over tared
sample pans for drying purposes.
The unit comprises a cylindrical
drying chamber in which is placed a stand carrying 12 circular
copper trays; each tray is designed to take sis stainless
steel sample pans (TKE186). The top of the drying chamber
is enclosed by a hinged insulated lid. In the centre of the
chamber is an air distribution tube through which pre-heated
air passes over the pans to facilitate the drying process.
The drying chamber is
enclosed in a second, larger chamber providing a combined
water reservoir and steam boiler in which is housed a copper
coil. An immersion heater maintains the water at boiling point.
Surplus steam is discharged from the top of this chamber to
an air cooled condenser, with the condensate returning by
gravity to the reservoir, thus sustaining the water level.
An electrical blower at
the base of the oven passes air through the heated copper
coil; it then enters the drying chamber through the air distribution
tube. After passing over the sample pans, the air escapes
to atmosphere via the vent provided in the centre of the lid.
The oven is controlled
using fused on/off switches for both the heater and air blower.
An ammeter is fitted above each switch to indicate the combined
load. Air flow through the drying chamber is regulated by
a valve and measured by a rotameter calibrated over the range
2 to 20 litres/min.
View the Specification
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