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LOW MASS INSULATION
The furnace is insulated with 6 inches of low “K” factor ceramic fiber and mineral wool insulation. Two inches of this insulation consists of a removable molded element/insulation module that lines the interior of the furnace. It is not brittle and so maintenance is minimal. The insulation has a very low thermal mass and hence heats up very quickly. Heat up to 1800F (980C) will take approximately 45 minutes. No asbestos is used.
CERAMIC FIBER MOLDED ELEMENTS
Elements are embedded in ceramic fiber and are made of iron-aluminum-chrome alloy. The elements are preoxidized (which is what protects this alloy from the high temperatures.) Element sections are replaced easily. The elements are evenly spaced along the entire surface of the interior and hence will provide the maximum in temperature uniformity by uniformly radiating along the entire surface of the tube. The insulation is fitted with vestibules at both ends. These protect the elements and help hold the tube in place. They hold heat in around tube. The vestibules split open with the furnace case.
BENCH MOUNTED CASE CONSTRUCTION
The furnace case is constructed of welded 10 and 14 gauge steel. There is a detached control panel that contains all controls, control components and power supply. The case is primed with 800F silicone paint and finished in machine enamel. The hinged case splits open in the center from one side and latches closed on the other side.
DIGITAL PID CONTROL SYSTEM
The standard control is a Honeywell UDC 2300 digital PID 3 mode control. Mercury contactors are standard. SCR power controls are optional. Thermocouples are Type K. The control voltage is transformed to 120 volts. Control and power circuits are branch fused. A NEMA 13 lighted On/Off switch is included. All fuses, transformers, contactors, and controls are located in a bench mounted NEMA 1 panel. Customer must connect fused power supply to single point on panel.
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper watt ratings. The controls are fully calibrated and the control system completely tested. A complete instruction manual includes start up instructions, theory of operation, maintenance instructions, parts list , and a detailed trouble shooting guide. A ladder logic diagram and panel layout are prepared on CAD for easy readability.
WARRANTY
The furnace is warranted for one year except for elements and thermocouples (warranted for 6 months.)
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