Appliance for heat treatment and method for operating the appliance

An appliance for heat treatment or inductive heating or cooling of shrink chucks for shaft-shaped tools or a shrinkage appliance or a cooling appliance or a shrinkage appliance with a cooling appliance, the appliance comprising:

• a receiving device or a receiving opening for receiving the shrink chuck;
• a heat treatment unit or an induction coil arrangement or a cooling unit surrounding said receiving device relative to a central axis;
• a measuring unit for contactless temperature measurement of the shrink chuck;
• said measuring unit having a plurality of sensors disposed around said receiving device, said plurality of sensors including at least one first sensor being a temperature sensor for contactless detection of a shell temperature of the shrink chuck disposed in said receiving device, and at least one second sensor being a sensor of a type different than said first sensor for detection of another property of the shrink chuck disposed in said receiving device;
• and
• a substantially ring-shaped structural unit, said sensors being disposed in said substantially ring-shaped structural unit at least one of substantially circularly about a central axis of said substantially ring-shaped structural unit at different axial heights or at an identical axial height relative to said central axis of said substantially ring-shaped structural unit.