Profile: The Mellen Company specializes in supplying high temperature furnaces. Our furnaces are box furnaces, tube furnaces, split furnaces, crucible furnaces, lab furnaces, fiber draw furnaces, graphite furnaces and pusher furnaces. We also provide power supplies, rack mounted power supplies, heating elements, thermocouples, end caps, sight glasses, floor stands, counterweights and over temperature alarms. Our thermocouples are temperature sensors that are composed of two dissimilar metals fused together that which produces a change in the voltage when heated.