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HIGH TEMPERATURE UNIFORMITY
The furnace is uniform to within +/-20F (+/-10C) at 1800F (975C) within 2/3 of furnace. Optional recirculating systems are available for tighter uniformity of up to +/-10F.
TWO ZONE CONTROL FOR CLOSE GRADIENTS
The elements are divided into top and bottom zones. The control output is routed through two input switches which allow adjustment of the total time on to each zone. There are thermocouples mounted in the top and bottom with a selector switch to read the temperature differential.
EVEN ELEMENT PLACEMENT
Elements are evenly spaced around the top, bottom and sides. On the XL 112, XL 124 and XL 126 there are 12 elements evenly divided on each of these surfaces. The XL 894 has 5 elements on the top and bottom and 3 on each side.
CERAMIC ELEMENT HOLDERS
The elements are supported in proprietary ceramic element holders. These provide perfect support for the coiled element as well as excellent radiating characteristics. The smooth surface prevents premature failure of the element as it expands and contracts.
EFFICIENT MULTILAYERED INSULATION
The furnace is insulated with 2-1/2” of low K factor refractory firebrick as the primary insulation. This is backed up by 2” of very low K factor mineral wool board on all surfaces except the bottom which has 2” of hard calcium silicate back up for solid hearth support. Top is 4-1/2” firebrick for strength. This yields an excellent combination of strength, insulating quality and fast heat up and cool down time. All refractory is coated with a special facing that prolongs firebrick life and helps prevent spalling and dusting. The refractory sections are available completely shaped for easy replacement without cementing. All sections fit together with engineered heat locks which improve the insulating integrity of the furnace. No asbestos is used.
FAST HEAT UP AND COOL DOWN TIMES
An empty XLB furnace will heat up to 2000F (1093C) in approximately one hour. The higher K.W. option will trim this. Cool down to 500F (260C) is approximately 10 hours. The venturi option speeds cooling.
HEAVY DUTY BENCH MOUNTED CASE
The furnace case is constructed of 10, 14 and 16 gauge steel with stiffeners. The entire case is primed with 800F silicone paint and finished in machine enamel. Lifting rings are provided.
CERAMIC HEARTH INCLUDED
The standard hearth is a 3/4” thick ceramic plate elevated on ceramic standoffs 1-1/2” above the bottom elements. This air space aids uniformity.
SPRING LOADED VERTICAL PLUG DOOR
The furnace door is a spring loaded swing up vertical door. The spring holds the door tightly closed, counterbalances it while opening, and holds it up while open. The hot face of the door is kept from the operator. There is a 1/2” refractory plug which protrudes into the furnace chamber and provides an effective heat lock. There is a 2” refractory to refractory seal around the perimeter of the door. Pneumatically operated vertical doors are optional.
DIGITAL PID CONTROL SYSTEM
The standard control is a Honeywell UDC 2300 digital PID 3 mode tuning control with two displays. All fuses, transformers, contactors, and controls are located in a NEMA 1 panel. Quiet, long life mercury power contactors are standard; SCR power controls are optional. The thermocouples are Type K. Thermocouple break protection is included. Limit switches shut off furnace power if the door is opened or the element cover plate is removed. Control voltage is 120 volts. The control circuit and each power branch circuit are fully fused. A NEMA 13 lighted On/Off switch is included. Customer must connect fused power supply to single point on panel.
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper watt ratings. A complete instruction manual includes easy 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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