BLUE M
Model ESP400 Industrial Oven
Page 17
A high volume horizontal airflow system is employed with the conditioning system to provide maximum
temperature uniformity. The heating and generation of airflow occurs in the conditioning plenum located
below the workspace. The plenum is isolated from the workspace so that no direct heat radiation can occur.
Air circulation is generated by a centrifugal type blower wheel, which is driven by an externally mounted
motor. A unique airflow management system allows air circulation to be varied between a One-Pass type
system and a Full Recirculated type system. This is achieved by opening / closing the air intake and exhaust
dampers. Both systems are described later in the section. Dampers should be opened to remove unwanted
process vapors, shorten drying times, or to cool down the oven after the heating cycle.
Basic Airflow Description:
Process air is heated as it is drawn in by the blower wheel and forced through open air electric wire
elements. The elements are configured in a cylindrical stack and are supported by ceramic discs. Heated air
is discharged up into the right side duct wall. It then enters the workspace through perforations over the
entire height and depth of the chamber. Air flows horizontally across the workspace to condition the product,
and exits through perforations in the left side duct wall. Processed air returns to the conditioning plenum for
reconditioning. It may be exhausted and mixed with fresh ambient air in varying degrees, depending on the
settings of the intake and exhaust dampers.
Type J Thermocouples are used for temperature sensing by both the main and limit controllers. These are
mounted in the airflow at the top of the workspace.
6.0
IR CIRCULATION SYSTEM
AIR CIRCULATION
Air Circulation
Conditioning Plenum
Thermocouples
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