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NICKEL-CHROME ELEMENTS
The elements are coiled nickel-chrome 80-20 alloy. These will resist wax burn out applications and oil from machined parts. A low watt density (9 watts per square radiating inch) is used for long element life.
CERAMIC ELEMENT HOLDERS
The elements are supported in ceramic element plates located on the sides of the furnace. 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. Element replacement is easy.
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. 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 B86 bench furnace will heat up to 2000F (1093C) in less than 2 hours. The furnace will cool down from 2000F to 1100F in 3 hours and to 500F (260C) in another 7 hours. Venting options will speed cooling.
GOOD FURNACE UNIFORMITY
The temperature uniformity +/-50F (+/-27C) when measured 2” in from all corners. Uniformity is +/-20F (+/-11C) within 12” space front to back (5” from front and 1” from back.)
HEAVY DUTY BENCH MOUNTED CASE
The furnace case is constructed of 14 and 16 gauge steel. The entire case is primed with 800F silicone paint and finished in machine enamel.
CERAMIC HEARTH INCLUDED
The standard hearth is a 3/4” thick ceramic plate elevated on ceramic standoffs 1/2” above the bottom firebrick. This air space aids uniformity. The hearth is 8” wide by 16” deep.
SINGLE PIVOTED HORIZONTAL DOOR
The furnace door is a single pivoted horizontally opening door with a heavy duty hinge mounted on the left. A De-Sta-Co latch closes the door tightly. 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.
DIGITAL PID CONTROL SYSTEM
The standard control is a Honeywell UDC 2300 digital PID 3 mode tuning control. All contactors and controls are located in a side mounted NEMA 1 panel. Power control is with mechanical power contactors. The thermocouple is Type K. Thermocouple break protection is included. Limit switches shut off furnace power if the door is opened or the power panel back is removed. Customer must connect fused power supply to panel. In addition, there is a separate 120 volt power supply with supplied plug for the controls.
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper operation. 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 wiring 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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