XLE3360

XLE Series Precision Electric Box Furnaces 2350°F (1287°C)

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LOCKED BY SERIES
Type Medium Box
Power Source Electric
Loading Front
Uniformity AMS Class 4 (± 20ºF / 10ºC)
Atmosphere Air
Lining Brick w/ Fiber Roof

Applications

LOCKED BY SERIES

Description

The high uniformity of the XLE Series makes it a staple in the heat treating industry. It's the perfect box furnace solution for your hardening, solution heat treating, stress relieving, annealing, aging, precipitation hardening, and tempering needs.

In the ceramics field, the XLE Series is a reliable, precision-controlled workhorse, promising repeatable results in ceramic bisque firing, thin film processing, glazing, and decorating.

Other industries rave about its excellence in everything from brazing, calcining, and drying, to the melting of glass and metals, glass annealing and bending, enameling, and sintering.

Although we have many "standard" configurations, XLE Series furnaces are available in a number of custom sizes and options to suit specific needs, including:

  • Vertical Doors
  • Fans
  • Cooling Venturis
  • Vents
  • Special Hearths
  • Racks
  • Baskets / Loading Devices
  • Quenching Systems
  • Controlled Atmospheres
  • Retorts
  • Viewing Ports
  • Element Alloys
  • Thermocouples
  • Alarms
  • Program Controls
  • Recorders

Processes


Markets

Specifications

Dimension
W
H
D
Inside
31
33
61
Working
28
28
56
External
69
74
84
Hearth
28
-
56
Door Height Open 129
Work Cubic Feet 25.41
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 60
High Temp 2350
High Power 78
Element # 24
* All power values in KW unless otherwise specified.
Weight
Ship Weight 3800
Max Load 850
* All weights in Lbs unless otherwise specified.


Additional Features

EXCELLENT UNIFORMITY
The furnace is uniform to within +/-20F (+/-10C) above 1400F (760C) within the Uniform Working Dimension (see specification chart). Optional fan systems are available for tighter uniformity of up to +/-5F.Tighter uniformity is also achieved by reducing the working dimensions and with multi-zoning.
DOUBLE PIVOTED PLUG DOOR
The standard door is a double pivoted horizontal plug door. The double pivoting allows the door to open like a parallelogram which keeps the hot face from the operator. There are two heavy duty clamps for tight sealing. Because of the completely horizontal motion of the door as it is sealing there is no wear on the seal face. The door has a 3/4” refractory plug which protrudes into the furnace chamber and provides a highly effective heat lock. There is a 3-1/2” refractory to refractory seal around the perimeter of the door. Counterbalanced vertical doors with hand crank, pneumatic or electric actuator are options. Vertical doors lift away from the furnace seal before lifting up. They also include a heat locking plug.
CERAMIC ELEMENT TERMINALS
Unique L&L designed all ceramic element terminal blocks allow the element ends to be clamped without twisting the whole end around a terminal bolt, making it easy to remove an element. The connection wires can be easily removed without disturbing the element termination (which allows you to easily isolate an element for a resistance check.) The terminal block features superb electrical isolation characteristics.
A WIDE VARIETY OF HEARTHS
The standard hearth is one or more 3/4” thick ceramic plates elevated on ceramic blocks 1-1/2” above the bottom elements. This air space improves uniformity. Silicon carbide plates, alloy plates, roller hearths, baskets, racks, loaders, castable piers, air cooling tables and many other loading options are available.
SIDE MOUNTED CONTROL PANEL WITH HINGED DOOR HOLDS ALL COMPONENTS
All temperature controls, relays, contactors, power controls, switches, transformers and fuses are located in a side mounted NEMA 1 control panel with a gasketed hinged door. J.I.C. wire coding is used throughout. An oil tight NEMA 13 lighted on/off push -button switch turns the furnace on. Controls are mounted at eye level for easy visibility. A NEMA 12 panel with fused disconnect switch is optional. A cooling fan is included with SCR power controls.
DIGITAL PID CONTROL SYSTEM
The standard control is a Honeywell UDC 2500 digital PID 3 mode tuning control with two displays. All fuses, transformers, contactors, and controls are located in a NEMA 1 panel. (NEMA 12 panels with fused disconnects are optional). Quiet, long life solid state 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.
DIGITAL HONEYWELL UDC 2500 PID TEMPERATURE CONTROL
A Honeywell UDC 2500 microprocessor based digital single set point control is standard. Two full vacuum fluorescent displays include English language programming information for easy set up. This is one of the easiest digital controls to operate. Accuracy is .25% of scale. All PID tuning constants (proportioning band, reset, rate) plus maximum temperature, scale range, thermocouple type and many other parameters are programmable. Ramp/Soak programming is optional. Many other controls are optionally available.
DIGITAL HIGH LIMIT CONTROL
A Honeywell UDC 1200 digital high limit control, complete with back up contactors and separate thermocouple, shuts off furnace if temperature or power control fail. The digital control allows a maximum temperature to be programmed into the control.
SOLID STATE CONTACTORS FEATURE FAST CYCLE TIME FOR ACCURATE CONTROL
Other benefits are long contactor life and quiet operation. No mercury. SCR power controls are optional.
TWO ZONE CONTROL FOR CLOSE GRADIENTS
The elements are divided into top and bottom zones. The control output is routed through two input switches to allow adjustment of the total time on to each zone. There are thermocouples mounted top and bottom with a selector switch to read the differential. Special designs with up to six zones or more can be used to promote even greater temperature uniformity.
TYPE K THERMOCOUPLES WITH SHIELDED EXTENSION WIRE
Type K open thermocouples are standard. All thermocouple lead wire is shielded from electrical noise and grounded to a common ground. Lead wires are carefully run to avoid interference from power wiring. Inconel sheathed Type K are a commonly supplied option. Type R and Type S platinum thermocouples are also optional.
MANY SAFETY FEATURES
Thermocouple break protection is included. Limit switches shut off power to furnace if the door is opened or the power panel back is removed. Control voltage is transformed to 120 volts. The control and branch power circuits are fully fused.
BUILT IN RELIABILITY
The furnace is warranted for one year except for the elements and thermocouples (six months.) The control system is burnt in and calibrated at actual operating temperatures in a test furnace and a recording of this test is provided. As a result of having made a large number of these furnaces, the engineering thought and detail devoted to this series is extensive. L&L has paid great attention to small details, interchangeable parts, serviceability, reliability, adjustments, documentation and instructions . The design has continuously evolved over 40 years.
EXTENSIVE INSTRUCTIONS AND DOCUMENTATION
Along with the informative J.I.C. wiring diagram, which includes a sequence of operations and a ladder diagram (for easy troubleshooting), there is an extensively detailed instruction book with a general dimension and assembly drawing, start up, installation, operation, maintenance and troubleshooting information.
WORLDWIDE SERVICE
Although these furnaces are designed for easy in-house start up and maintenance, worldwide factory service and start up assistance is available
WARRANTY
The furnace is warranted for one year except for elements and thermocouples which are warranted for six months. See warranty sheet Q12W.
TEMPERATURES TO 2350F
With optional nickel-chrome elements the maximum temperature is 2100F(1134C.) Some options such as fans and other alloy components may also limit the temperature.
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.
PRESHAPED BRICK SECTIONS SAVE ON HEAT LOSS AND MAINTENANCE COSTS
The refractory is cemented in sections on a very flat table. These sections are then precision cut and routed. All sections fit together with engineered heat locks which improve the insulating integrity of the furnace even after many years of service. Brick sections can easily be installed by in-house maintenance personnel saving on expensive specialized bricklayer labor.
EFFICIENT MULTILAYERED INSULATION
The furnace is insulated with 4-1/2" of low K factor refractory firebrick 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 times. The roof of all models which are 24" wide or above is made from 2600F ceramic fiber modules to prevent roof failure.
LOW WATT DENSITY ELEMENTS FOR LONG LIFE
The standard elements are coiled from high grade iron-aluminum-chrome alloy (Kanthal A-1 or the equivalent). Kanthal APM (advanced powder metallurgy and dispersion strengthened alloy), Nickel-chrome (80-20) and other alloys are available for special atmospheres and applications. A watt density normally below 10 watts per square inch maximizes element life. (Watt density is the ratio of watts to square inches of radiating surface area.)
EVEN ELEMENT PLACEMENT
Each element is separately and evenly spaced on the bottom, sides, door and back. This is the finest method of distributing radiant heat energy at high temperatures.
CERAMIC ELEMENT HOLDERS
The elements are supported in proprietary high temperature ceramic element holders. These provide perfect support for the coiled element and excellent radiating characteristics. The smooth surface of the holder prevents premature failure of the element as it expands and contracts. These holders, coupled with a unique all ceramic element terminal, make element replacement easy. Being recessed into the wall of the furnace these elements are not as susceptible to mechanical damage as some other types of element support systems.
HEAVY DUTY CASE WITH INTEGRATED STAND
The furnace case is constructed of 10 gauge steel with external bracing angles welded to the entire case and base assembly. Leveling bolts, anchoring holes and lifting rings are included. The main seams are continuously welded for an attractive appearance. The entire case is primed inside and out with a high temperature (800F) silicone based paint. The final coat is a heat resistant blue enamel. Custom colors are available. Sealed cases for controlled atmosphere use are optional.

Additional Options

COUNTERBALANCED GUILLOTINE VERTICAL DOOR
The furnace door is mounted on a guillotine type vertical track. The door rides in the track, which pulls the door away from the furnace seal as soon as it begins to open vertically. The door is attached to the counterbalance by heavy roller chain. A hand crank, normally located on the right side of the furnace, effortlessly raises and lowers the door. An automatically engaged safety latch holds the door in the up position until manually released by the operator. A minimum of 3-1/2" refractory to refractory seal is provided.
AGITATED AND HEATED QUENCH TANKS
AGITATED HEATED QUENCH TANKS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
ELECTRIC MOTOR OPERATION FOR VERTICAL DOOR
The counterbalanced door can also be operated by an electric motor. This has the advantage of precise positioning at various points in the travel of the door. Also the door does not have to open all the way before closing. Includes a safety torque limiter to protect against jams. It is much slower than the pneumatic door operator.
FLOOR MOUNTED DOOR SWITCH
A floor mounted dual foot switch is provided. This controls the up and down motion of the door.
FLOOR MOUNTED PNEUMATIC DOOR CONTROL
A floor mounted valve is provided which is foot operated. This controls the up and down motion of the door.
HEAT SHIELD
A perforated heat shield is attached to the outside of the furnace back, sides and door. This maintains a low external case temperature below 120F (50C).
HIGH TEMPERATURE FANS
Fans are the best way to increase the gradient uniformity inside the furnace. The maximum continuous temperature of the standard L&L fan system is 1875F. This system will normally provide a gradient uniformity within the furnace chamber of +/-15F or better with appropriate loading of the furnace. A machined aluminum heat dissipator removes heat from the shaft before the heat reaches the bearings. Two self centering pillow block bearings hold the shaft and a belt drives it from the motor. An OSHA shield is provided. The fan automatically turns off when the door is opened. Some fans have 6 pitched blades and blow down. The blade section is cast and then welded to a machined alloy shaft. Others have either 4 or 6 flat blades and pull the air up, discharging it to the sides. See quote for specifics.
INERT GAS PANEL
The furnace case is tightly sealed for use with a protective inert atmosphere. Argon, nitrogen and gases enriched with up to 4% combustible gas (such as hydrogen or propane) can be used. No safety systems are required. A threaded alloy fitting introduces the gas into the furnace chamber. The element connection chamber is typically purged. The door seal is augmented with a woven ceramic fiber gasket. A properly sized flowmeter/regulator is included with the atmosphere system. A rule of thumb on atmosphere usage is to figure six to ten times the furnace volume times the number of hours the work will be in the furnace.
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.
LOADER
A heavy duty loader will pick up the hearth tray by pivoting slightly in the back by means of a hydraulic cylinder actuated by a hand pump located on the loader. The loader can have two swivel wheels and two fixed wheels. Optionally, the wheel can be mounted on either inverted "V" tracks or railroad tracks embedded in the floor. All distances are engineered for precise and trouble free operation. The loader is typically designed to pick up the maximum rated load of the furnace. The loaders can be fitted with motorized drives.
MISCELLANEOUS OPTIONS
MISC OPTIONS
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.
ON SITE START UP AND TRAINING
An L&L factory technician will review and check out customer’s installation, start up and burn in furnace, and train the operators.
PNEUMATIC OPERATION FOR VERTICAL DOOR
A pneumatic cylinder can be added to the vertical door. This raises and lowers the door instead of a hand crank. This is controlled by a hand or foot operated valve. This switch controls both the up and down motion of the door. An adjustable cushion is built into the cylinder to prevent damage to the furnace seal as the door closes. In addition, the speed of the door motion is adjustable. The cylinder is high quality and is repairable if necessary. Included in the system are the oiler, filter and air regulator. 40 to 60 PSI shop air is required.
PROGRAMMABLE MOTORIZED VENTURI
The venturi motor is controlled with a magnetic motor starter and push-button, with a relay programmed by the programmable temperature controller for turning the motor on and off in order to follow a programmed cooling curve. A separate pneumatically controlled inlet damper is normally also added. The inlet and out dampers then open or close with the programmed switch.
RECIRCULATION MUFFLE
This system will insure a gradient uniformity within the furnace chamber of up to +/-5F. It is used in conjunction with a furnace fan. A reinforced, welded stainless steel recirculation muffle rests inside the furnace chamber. (This can be lifted out without damaging the refractory.) The muffle typically includes baffles along the sides. On recirculation muffles with top mounted fans the bottom is typically constructed of heavy reinforced perforated or expanded alloy which becomes the hearth of the furnace. These baffles direct the moving air around the elements and through the work space to the fan. They also shield the work from radiant hot spots. Where the fan is mounted horizontally in the back, the bottom is solid and the air is recirculated around through the open front. On top loading furnaces, the fan is normally mounted on the bottom and the air is pulled through the open top. A stainless steel 304 recirculation muffle can be used to 1400F while the 330 alloy muffles can be used to 1875F.
SINGLE ZONE SCR POWER CONTROLLER
A zero fired SCR power control with two-leg control is used instead of contactors. This is constructed with transient voltage protection, sub-cycle fuse protection, extra large heat sinks, and positive zero firing. Gain and bias adjustments are included for tuning.
TWO TO EIGHT ZONE SCR POWER CONTROL WITH MANUAL BIASING
Digital biasing control is included to adjust relative output of SCRs to adjust temperature uniformity. There are up to 8 separate Zero Fired SCR power controls, one for each zone of heating. This allows you to fine tune the furnace for different temperature points. The SCRs are microprocessor based. The biasing switches have 99 increments.
VIEWPORTS
The cast iron peephole assembly includes a viewing glass. This is made by Tate-Jones. Other types are also available.

Downloads

Brochure For XLE
Photo Sheet For XLE
Capabilities Brochure
Photo Sheet For XLE With Air Quench