HIGH TEMPERATURE 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.
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
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.
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.
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.
FAST HEAT UP AND COOL DOWN TIMES
An empty XLB furnace will heat up to 2000F (1093C) in approximately one hour.
The higher K.W. option will trim this. Cool down to 500F (260C) is approximately 10 hours.
The venturi option speeds cooling.
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.
CERAMIC HEARTH INCLUDED
The standard hearth is a 3/4 thick ceramic plate elevated on ceramic standoffs
1-1/2 above the bottom elements. This air space aids uniformity.
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.
DIGITAL PID CONTROL SYSTEM
The standard control is a Honeywell UDC 2000 digital PID 3 mode tuning
control with two displays. All fuses, transformers, contactors, and controls are located
in a NEMA 1 panel. Quiet, long life mercury 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.
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper watt ratings. 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.
The furnace is warranted for one year except for elements and thermocouples
(warranted for 6 months.)
- OVERTEMPERATURE SYSTEM: Honeywell UDC 2000 digital high limit
back up control with manual reset, back up contactors and separate thermocouple.
- JIC CONTROL OPTION: This includes a NEMA 12 control cabinet, all
oil tight switches and a panel mounted fused disconnect switch. Zone switches are
- HIGH K.W.: See Specifications for amount.
- INERT ATMOSPHERE CONTROL
- SCR POWER CONTROL: For greater precision. It is also possible to
put the element circuits on separate SCRs and bias the control output digitally for
precision zone control.
- HIGH TEMPERATURE FAN: Increases uniformity to +/-10F. Limited to
- SPECIAL HEARTHS: Silicon Carbide or alloy hearth increases
maximum load capacity by 1-1/2 times.
- ANGLE IRON FLOOR STAND: Hearth level is approximately 40
from floor with this stand.
OTHER BENCH FURNACES IN SIMILAR TEMPERATURE RANGE:
- (B86) 2000F Small - 8"W x 8"H x 16"D - Bench Furnace
- (HB Series) 2200F Bench Furnace - 3 Sizes up to 12"W x 8"H x 36"D -