In the early 1980s Elmwood Sensors, part of Hawker Siddeley's Instruments and Controls Division, was totally reliant on a single 15‐year‐old product range of electro‐mechanical thermostats using a bimetallic strip. Dissatisfied with this insecure situation and uncertain about the long‐term sales life for electromechanical sensors, the company decided that it should start looking for advanced technology substitutes.
Hollingum, J. (1991), "NEW CERAMIC DEVELOPMENTS AT ELMWOOD: SEARCHING FOR A SUCCESSOR FOR THEIR TRADITIONAL BIMETALLIC THERMOSTATS, ELMWOOD SENSORS INVESTIGATED ELECTRO‐CERAMICS AND FOUND THEMSELVES IN POSSESSION OF A NUMBER OF EXCITING SPIN‐OFF DEVELOPMENTS", Sensor Review, Vol. 11 No. 4, pp. 11-13. https://doi.org/10.1108/eb007857
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