GLF248

GLF Series Silicon Carbide Element Electric Floor Standing Box Furnaces 2500°F (1370°C)

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LOCKED BY SERIES
Type Medium Box
Power Source Electric
Loading Front
Uniformity AMS Class 5 (± 25ºF / 14ºC)
Atmosphere Air
Lining Brick w/ Fiber Roof

Applications

LOCKED BY SERIES

Description

The GLF SERIES Electric Silicon Carbide Element Floor Standing Furnaces feature continuous 2500°F (1370°C) operation. This is ideally suited for applications where temperatures between 2000°F (1095°C) and 2500°F need to be reached under normal operating conditions and/or where very long high heat cycles will be run. The silicon carbide elements also have important advantages with certain atmospheres and operating conditions.


Processes


Markets

Specifications

Dimension
W
H
D
Inside
27
36
51
Working
24
24
48
External
79
7
74
Hearth
24
-
48
Work Cubic Feet 12
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 80
High Power 86
Max Temp (°F) 2500
* All power values in KW unless otherwise specified.
Weight
Ship Weight 5500
Max Load 600
* All weights in Lbs unless otherwise specified.


Additional Features

TIGHT PLUG DOOR WITH A DOOR VESTIBULE
The double pivoting of door allows parallelogram opening of the plug door which keeps the hot face from the operator and allows tight sealing of the door. The door features a 1” deep plug with heat locks. A vestibule around the perimeter of the door reduces heat loss when the door is opened. This also aids temperature uniformity while protecting the elements from physical damage.
1-1/2” THICK SILICON CARBIDE HEARTH
The hearth is a 1-1/2” thick silicon carbide hearth plate for strength and excellent heat transfer. Height from floor to hearth is 32”.
DIGITAL PID CONTROL AND HIGH LIMIT SYSTEM
The standard control is a Honeywell UDC 2500 digital PID 3 mode tuning control. All fuses, contactors, and controls are located in a NEMA 1 panel. The thermocouples are Type R. The control voltage is transformed to 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.
SCR POWER CONTROL AND TAP TRANSFORMER
The power control has a 6 position tap transformer with taps that are changed inside the control panel and a phase angle fired SCR. The SCR adjusts for most voltage changes automatically as needed, eliminating the need to manually change taps during operation.
TEMPERATURE UNIFORMITY OF +/-25F (+/-15C)
Uniformity of +/-25F (+/-15C) is normal above 1600F (870C) within 2/3 of the working dimensions.
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.
MULTILAYERED INSULATION; FIBER ROOF
There is 4-1/2” of 2800F (1535C) insulating firebrick backed up with 4” of ceramic fiber. The roof is made from 2600F (1425C) ceramic fiber modules. Completely shaped firebrick sections install easily for replacement. As an option, the entire insulation except for the door vestibule can be 2600F fiber modules for fast heat up and cool down. No asbestos is used.
SILICON CARBIDE HEATING ELEMENTS
Silicon carbide heating elements are mounted over and under the hearth for even heating. All element connections are on the sides. The elements are designed to run at line voltage. They permit the 2500F (1370C) maximum temperature under continuous operating conditions. Watt density is between 27 and 39 watts per square inch. Elements are rated for 3000F (1650C).
FLOOR STANDING CASE CONSTRUCTION
The case is reinforced 10 gauge and 3/16” sheet steel with an integrated floor stand and lifting rings. The entire case is primed with 800F silicone paint and finished in machine enamel.

Additional Options

CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
COUNTERBALANCED VERTICAL DOORS
Manual hand crank, pneumatic or electric operation. For dual chamber furnaces available only for the top chamber.
HIGH DENSITY SILICON CARBIDE ELEMENTS
These will provide greater element life than the standard silicon carbide elements, especially in atmosphere applications.
HIGH K.W.
See specifications for amount.
INERT ATMOSPHERE CONTROL FOR FURNACES WITH SILICON CARBIDE ELEMENTS
The GF and GLF furnaces can be fitted for use with inert or combustible atmospheres. Inlet of the atmosphere is through the element connection chamber to maintain cool element connections. This system includes special all aluminum element hardware inside the sealed boxes. The door features a special tadpole gasket. A completely piped flowmeter and regulator with ball valve, pressure gauge and pressure relief valve is included. Complete safety systems for use with combustible atmospheres are available. Temperature is limited to 2500F (1370C) with nitrogen, to 2200F (1200C) with any hydrogen over 4% but can take the full rated temperature with argon.
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.
MOTOR DRIVEN VENTURI SYSTEM
A motor driven venturi vent system is available. This system exhausts air out of the furnace and pulls in fresh air. Air inlets are located per customer specifications. (NOTE: venturis work by blowing air past a tube that is inserted into the furnace. This creates a vacuum without blowing cold air into the furnace. It has the advantage of having a controlled exhaust and minimizing heat shock in the furnace.) A 1 H.P. motor, complete with motor starter, drives the system. Capacity is 300, 600 or 1250 CFM, depending on the size of unit ordered. A stack should be installed to exhaust the hot air. Normally, a hand operated stainless steel damper is provided with the venturi system to control the amount of air being exhausted from the furnace.

Downloads

Photo Sheet For GLF
Brochure For GLF