The C2121/PM3E from Cress is designed for applications requiring a hardening furnace, a quench tank, and a separate furnace for tempering or drawing within minimum floor space. The two chambers enable immediate tempering or drawing after quench without waiting for the hardening furnace to cool to the lower temperature required.
The case is constructed of galvanized sheet metal and mounted in an angle steel frame. Space is provided for air circulation between chambers. Alloy wire heating elements are coiled and mounted on the side walls in porcelain plates that are said to be easy to change. The lower chamber is equipped with a stainless steel, centrifugal-type fan to circulate the air and provide close temperature gradients. The fan is operated by a 1/4-hp motor. The quench tank is stored beneath the lower chamber and can be rolled out for use. The upper chamber door raises vertically, and the lower chamber door swings to the side. A removable side panel on the control cabinet provides easy access to controls and wiring.
Both chambers are equipped with individual electronic controls, thermocouples and solid state relays. Auto-tuning microprocessor-based controls are accurate to ±1/4 percent. Each chamber is equipped with door safety switches that remove power from that chamber’s heating elements and fan blower. The door seal is standard for inert protective atmosphere on 2,250˚F chambers.