GHE24

GHE Series Molybdenum Disilicide Element Bottom Loading Elevator Furnaces - 3100°F (1700°C)

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LOCKED BY SERIES
Type Bottom Loading
Power Source Electric
Loading Elevator
Uniformity AMS Class 4 (± 20ºF / 10ºC)
Atmosphere Air
Lining Ceramic Fiber

Applications

LOCKED BY SERIES

Description

The GHE SERIES Ultra High Temperature Bottom Loading Elevator Furnaces feature lightweight ultra high temperature ceramic fiber insulation system for fast heat up and low BTU input requirements. The load is placed on an elevator that moves up into the bottom of the fixed furnace. Elements on all four sides provide superior uniformity. The GHE series achieves 3100°F (1700°C) under continuous operation. The insulation system, which is the most fragile and difficult aspect of this type of furnace, is uncompromised in quality and detail. It is guaranteed for one full year, unlike much of the competition where you can expect insulation failure fairly quickly.


Processes


Markets

Specifications

Dimension
W
H
D
Inside
28
26
28
Working
24
24
24
External
45
114
51
Hearth
24
-
24
Work Cubic Feet 8
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 40
Max Temp (°F) 3100
Element Size 16
* All power values in KW unless otherwise specified.
Weight
Ship Weight 3000
Max Load 200
* All weights in Lbs unless otherwise specified.


Additional Features

ELECTRIC ELEVATOR
The bottom rises and lowers into the furnace by means of an electric gear motor.
ALUMINA HEARTH SUPPORTED FROM COLD FACE
The hearth is a series of flat alumina plates supported by a series of insulating alumina posts which transfer the weight of the hearth all the way to the bottom of the cold face of the bottom insulation.
PID DIGITAL CONTROL , HIGH LIMIT CONTROL AND SCR POWER CONTROL
The standard control used is a Honeywell UDC 2500 digital PID 3 mode tuning control. All fuses, transformers, contactors, and controls are located in a NEMA 1 panel. A matched transformer and phase angle fired SCR controls power to the elements. This insures even, precise control and long element life. The thermocouples are Type B. The control voltage is 120 volts. A NEMA 13 lighted On/Off switch and NEMA 13 door power cut off switch are included. A Honeywell UDC 1200 digital high limit back up control with manual reset, back up contactors and separate thermocouple is standard. Customer must connect fused power supply to single point on panel.
TEMPERATURE UNIFORMITY OF +/-10C ( +/-20F)
Uniformity of +/- 10C (+/-20F) is normal above 1200C (2200F) within 2/3 of the working dimensions. The fact that the elements are on all four sides makes the uniformity particularly good.
TESTING AND INSTRUCTIONS
The furnace is tested to insure circuit integrity. 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 which are warranted for six months. See warranty sheet Q12W.
FAST HEAT UP:
Heats up to 2100 Deg F in less than one hour at 240 volts, less than 2-1/2 hours at 208 volts.
MULTILAYERED, EFFICIENT, HIGH ALUMINA CERAMIC FIBER INSULATION
The furnace is insulated with multi-layered high alumina and alumina-silicate ceramic fiber board. The hot face is prefired ceramic fiber board made by Zircar, Rath or other highly reputable insulation manufacturer. Two back up layers of fiber insulation are also used. Triple heat locks are designed into the system for extra protection at high temperatures. A vestibule protects the molybdenum disilicide elements, and prevents excessive heat loss when the bottom is opened. No asbestos is used.
DEEP PLUG BOTTOM CONSTRUCTION
The bottom features a deep plug type seal with triple heat locks. A vestibule around the bottom opening reduces heat loss and helps protect the elements.
MOLYBDENUM DISILICIDE ELEMENTS
The elements are molybdenum disilicide 3300C grade U-shaped elements. These will withstand (3275F) 1800C in air. All electrical connections are at the top, and the elements are suspended from the roof. The electrical resistivity of these elements remains constant over time with little aging. This allows replacement of one element without changing all elements, a distinct advantage over silicon carbide elements. Low watt density is designed into the elements for maximum element life. All aluminum element connection hardware is used to prevent galvanic corrosion. Elements are on all four sides.
DOUBLE WALL CASE CONSTRUCTION
The insulation module has its own rigid refractory board or stainless steel panel. This insulation module is inserted into a ventilated steel casing leaving an air space between the exterior case and the insulation module. This allows for cooling of the insulation, important in long insulation life, and helps maintain a cool external case temperature. The case is primed with 800F silicone paint and finished in machine enamel.

Additional Options

CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
JIC CONTROL OPTION
This includes a NEMA 12 control cabinet, all oil tight switches and a panel mounted fused disconnect switch. Zone switches if included are percentage timers.

Downloads

Brochure For GHE