Ceramaspeed Limited

Neil Swann

Peter Ravenscroft Wilkins

Frederick James Davis

Isobel Pearce

Apparatus and a method are provided for detecting an abnormal rise in temperature associated with a combination of a cooking utensil () and a cooking zone () of a cooking surface () overlying an electric heater (). The apparatus has a first temperature-responsive device () is provided within the heater and adapted to monitor temperature of the cooking surface (). A second temperature-responsive device () is provided within the heater and adapted to monitor temperature of the cooking utensil () through the cooking surface () to provide an electrical output as a function of temperature of the cooking utensil. Means () is provided for calculating first and second derivatives (DD) with time of the temperature sensed by the second temperature-responsive device () over an operating temperature range of the heater. Means () is provided to determine stabilization of the first derivative (D) within stabilizing threshold limit values. Means () is provided to thereafter compare the first and second derivatives (DD) with first and second predetermined threshold values and to detect an abnormal rise in temperature when the first and second predetermined threshold values are exceeded.

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Bromsgrove, United Kingdom

Neil Swann