XLB112

XLB Series Bench Mounted High Precision 2350°F (1285°C) Electric Box Furnaces

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

Applications

LOCKED BY SERIES

Description

The XLB furnaces achieve high precision by featuring highly accurate digital PID controls, solid state contactors for fast cycle times, two zone control (top and bottom), and very even spacing of elements. They reach 2350°F (1285°C) with the standard iron-aluminum chrome elements or 2100°F (1150°C) with the optional nickel-chrome elements. The XLB is bench mounted. It features a spring loaded vertical lift plug door. The furnace shown has silicon carbide hearth, fan, and 100 mm strip chart recorder options.


Processes


Markets

Specifications

Dimension
W
H
D
Inside
13
12
12
External
50
38
28
Hearth
11
-
11
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 6
High Power 8
Max Temp (°F) 2350
Element # 12
* All power values in KW unless otherwise specified.
Weight
Ship Weight 290
Max Load 75
* All weights in Lbs unless otherwise specified.


Additional Features

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.
CERAMIC HEARTH INCLUDED
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 and alloy plates are available options.
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.
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.
HIGH 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.
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper watt ratings. The controls are fully calibrated and the control system completely tested. A complete instruction manual includes easy start up instructions, theory of operation, maintenance instructions, parts list, general dimension drawing, general assembly and subassembly drawings where required, 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.
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.
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.
ROD OVER/BEND HEATING ELEMENTS OR RADIANT TUBE GAS BURNERS
Heavy duty Kanthal APM (advanced powder metallurgy and ddispersion strengthened alloy) rod/overbend elements are standard. This alloy is highly resistant to carburizing. Elements are typically located on the sides, back and door for good uniformity. Gas fired radiant tubes with ignitors are also available.
KANTHAL APM HEAVY ROD OVERBEND ELEMENTS
Heavy duty low voltage Kanthal APM sintered iron-aluminum-chrome alloy rod/overbend elements are standard. This alloy is highly resistant to carburizing and will take the high temperatures as well. Elements are located on the sides and bottom. These are particularly suited for carbon rich atmospheres. With regular burnout in air they will provide excellent life. They rely on their protection from the atmosphere by forming a thin aluminum oxide coating on the surface of the element. Because they have a thick (6 mm) cross section, they are more resistant to breakage, cracking and embrittlement than thinner gauge wire coiled elements.
EVENLY DISTRIBUTED ALLOY ELEMENTS
Coiled alloy elements are evenly distributed along the sides, back and door creating an even wall of radiation. Alloy used depends on application and temperature.
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.
HEAVY DUTY BENCH MOUNTED CASE
The furnace case is constructed of 10 gauge steel. The entire case is primed with 800F silicone paint and finished in machine enamel. Lifting rings are provided.
FURNACE CASE, STAND AND ENCLOSURE
The furnace case is split into two separate halves which are joined by a hinge and bolt on latches. This makes element and tube replacement simple. A heavy duty integrated stand is built in three sections for easy shipping. This stand is covered with removable sheet metal panels for attractive appearance and safety. There is a door for access to the loading fixture. This must be closed after the load is fixed onto the load hook in order for the loading sequence to proceed. High temperature silicone based primer is painted on all surfaces and finished with machine enamel.
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.

Additional Options

ALLOY HEARTHS
Lower temperature furnaces are available with fabricated alloy hearths. These have welded sides (normally 1" high) and reinforced bottoms. 304, 330 and Inconel 601 series stainless steels are commonly used.
CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
HIGH K.W.
See specifications for amount.
HIGH TEMPERATURE FAN
Increases uniformity to +/-10F. Limited to 1875F operation.
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.
OVERTEMPERATURE SYSTEM
Honeywell UDC 1200 digital high limit back up control with manual reset, back up contactors and separate thermocouple.
SILICON CARBIDE HEARTHS - BENCH AND SMALL DUAL CHAMBER FURNACES
The optional hearths feature molded sides and are 1" thick.Silicon carbide features high strength at high temperatures, a non warping flat surface, and excellent heat transfer (which is important if there are elements under the hearth).
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.

Downloads

Brochure For XLB