Preheating furnace for dental technology materials - has blower operated by relay in parallel with blower motor

摘要

The preheating furnace is used in dental technology materials. The furnace has chimney and associated blower and temp. actuated switch. Temp. distribution within the furnace is uniform after the required temp. has been reached. The preheating and drying process is carried out in controlled manner over a holding period. The switching system switches the blower off at a given point of time at which a specified temp. is reached. The blower remains switched off over a period in which the material is held in the furnace. The furnace temp. is regulated during holding time to a specified value, by a relay connected in parallel in the blower motor. The relay can be switched manually only by switch in series with the relay.