Furnace

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F - Mech Eng,Light,Heat,Weapons

27

D

F27D 7/06 (2006.01) F27D 99/00 (2010.01) B23K 1/008 (2006.01) B23K 1/012 (2006.01) F27B 9/04 (2006.01) G05B 11/42 (2006.01) H05K 3/34 (2006.01) F27D 19/00 (2006.01)

Patent

CA 2191291

A furnace, for instance a reflow soldering oven, in which oxygen concentration is either directly or inferentially sensed within central processing and either one or both of the inlet and outlet sections of the furnace. Signals generated by these sensors are processed in a PID controller to generate a control signal to control the flow rate of inerting gas into the central processing section, thereby to at least inhibit ingress of air into the central processing section. The PID controller is programmed such that its integral error term is set equal to a time average of the oxygen concentrations of the central processing section less an oxygen concentration set point desired for the central processing section. The proportional and differential error terms are set equal to a time average of the concentrations of the central processing section and one or both of the inlet and outlet sections of the furnace less the oxygen concentration set point.

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