ES224315A3 - A system of thermal regulation by variation of an ohmic resistance (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Thermal regulation system by variation of an ohmic resistance, which is essentially characterized by the fact that, as a basic element, a Wheatstone bridge consists of five resistors, one of them adjustable that acts as a potentiometer, while the other fixed, one is intended to be installed in the heating device or device whose temperature has to be regulated, with the appropriate control indicated on the potentiometer with a scale of values for the adjustment and the bridge assembly being connected to an amplifier circuit in which two or more valves, to the grid of the first of which the Wheatstone bridge is joined, interspersed in the circuit of the plate of the last of such valves a combined relay with a contactor to connect the heating element to be controlled, being completed the general circuit referred to with a power transformer, a rectifier and the resistors and capacitors necessary, all this in such a way that in the "0" position of the potentiometer the balance of the bridge and the lack of tension in the valve grid are achieved, while with the actuation of that variable resistance the indicated bridge is unbalanced, it is born a voltage that polarizes the aforementioned grid and that, duly amplified by the group, puts into action the relay that moves the contactor of the heating element. (Machine-translation by Google Translate, not legally binding)