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FURNACE CASE, STAND AND ENCLOSURE
The furnace case is split into two separate halves which are joined by a hinge and bolt on latches. This makes element and tube replacement simple. A heavy duty integrated stand is built in three sections for easy shipping. This stand is covered with removable sheet metal panels for attractive appearance and safety. There is a door for access to the loading fixture. This must be closed after the load is fixed onto the load hook in order for the loading sequence to proceed. High temperature silicone based primer is painted on all surfaces and finished with machine enamel.
FURNACE SYSTEM
The furnace is insulated with 4” of ceramic fiber backed up with 2” of mineral wool. No asbestos is used. Iron-Aluminum-Chrome alloy coiled elements are embedded in ceramic fiber molded sections which are evenly distributed around the retort.
FAN AND RECIRCULATION MUFFLE
Inside the retort is a radial fan and recirculation muffle that forces the atmosphere through the work load. This results in even distribution of the reactive gasses and good temperature uniformity. This provides consistent and repeatable work.
INTEGRAL QUENCH SYSTEM
An agitated and heated quench tank includes a propeller agitator, high K.W. electric immersion heater, and drain. Designed for polymer quench. The quench tank is supported on a lifting platform which is raised and lowered by means of a brakemotor / gear reducer drive system. The platform and tank is counterweighted, and connected to sprockets on the driven shafts. Control is either automatic or manual by means of push buttons on the control panel.
LOAD ELEVATOR
The load rests on a plug that is lifted in and out of the retort by means of a pneumatic cylinder which provides a very fast quench.
NITROGEN/METHANOL ATMOSPHERE SYSTEM
A complete nitrogen/methanol atmosphere control system is included. Methanol dissociates into 67% hydrogen and 33% carbon monoxide. Along with 40% added nitrogen this provides the base atmosphere (very similar to endothermic gas but more uniform and with a lower dew point) ideal for carburizing, carbonitriding or neutral hardening. Propane gas is added to increase carbon potential. Ammonia is added for carbonitriding. Nitrogen is also used as an emergency and auxiliary superpurge. Atmosphere is contained within a 330 alloy retort preventing outgassing from the insulation. The atmosphere outlet is on the bottom just above quench tank. This forces the gas toward the bottom of the retort to control dew point. A floor standing flow control panel contains all the flow train components. Most items such as valves, flowmeters, regulators and gauges are flush panel mounted. Methanol system includes a nitrogen pressurized stainless steel tank. A monitored electric ignitor maintains a positive ignition source at the gas exit. This atmosphere system is designed to meet or exceed the regulations of the National Fire Protection Agency for controlled atmosphere furnaces (NFPA 86C.)
AUTOMATED CONTROL SYSTEM
The entire system is controlled with a Honeywell UMC800 ;ogic control and PID controller. This includes the 3 furnace heating zones, quench tank heater and all process and safety logic. The entire operation is automated so that once you establish your operating parameters for a process it is very easy to operate with unskilled labor. Power controls are zero fired SCRS. Control voltage is 120. All fuses, contactors, and controls are located in a NEMA 12 panel with a fused disconnect switch. Thermocouples are inconel sheathed Type K. The control voltage is transformed to 120 volts. A Honeywell UDC 2300 digital FM approved high limit back up control with manual reset is included with back up contactors and separate thermocouple element. Single point power connection. Meets National Electrical Code.
TESTING AND INSTRUCTIONS
The furnace is completely tested in our factory. A complete instruction manual includes easy start up instructions, theory of operation, maintenance instructions, parts list, detailed trouble shooting guide, ladder logic diagram, panel layout, general dimension and assembly drawings. Start up service and training is included.
WARRANTY
The furnace is warranted for one year except for elements and thermocouples (warranted for 6 months.)
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