Abstract: A microwave oven moisture analyzer is provided with an analysis chamber using a V-shaped structure wherein the wings extend from a vertical back wall forwardly and outwardly to the side walls of the oven. The upper edges of the wings also rise as the wings extend, to where at their ends they engage the ceiling of the oven. A roof rests on the wings and slopes downwardly rearwardly. The back wall is shorter than the adjacent wing portions and hence an opening exists from the analysis chamber into the rest of the oven. Air flowing down over the roof creates a venturi effect at the opening to remove air from the analysis chamber. A four point arrangement supports a fiber-glass pad bearing a sample in spaced relation to the floor and the sides of the chamber and below the opening so that moisture evaporated does not have a place to condense before it is removed from the chamber.

Abstract: A high speed microwave high temperature oven system mounts an enclosed furnace in its cavity and extends a temperature probe therein. A controller regulates the furnace temperature by periodically interrupting over a range, the operation of the magnetron as the furnace or actual temperature approaches the setpoint. It interrupts the operation of the magnetron for longer periods of time as the actual temperature nears the setpoint. If the actual temperature exceeds the setpoint, the operation of the magnetron is interrupted for even longer periods of time. The controller at a selected furnace temperature also activates an exhaust function to remove hot air, smoke and fumes from and draw clean air into the furnace. As the actual temperature lowers towards the setpoint, the controller shortens the period of magnetron operation interruption. When the furnace temperature cools to a safe temperature, the controller shuts off the exhaust function.