TBUSeries

High Uniformity Three Zone 2100°F (1150°C) Split Tube Furnaces


Type Tube
Power Source Electric
Loading Horizontal Tube
Uniformity AMS Class 2 (± 10ºF / 6ºC)
Atmosphere Air
Lining Ceramic Fiber

Applications

Description

The TBU SERIES Bench Mounted Electric Three Zone Tube Furnaces utilize three separate heating zones to achieve +/-5°F (+/-2.7°C) or better within the center zone over a wide temperature range. The two end zones compensate for end heat losses. They are ideally suited for laboratory and small production requirements where precision temperature gradients are necessary. They are limited to 2100°F (1150°C.) although special versions can reach 2200°F (1200°C).


Processes


Markets

Standard Model Sizes

Our most popular model sizes are listed below. Discuss a custom solution that fits your exact needs by contacting our sales team today.
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LOCKED BY MODEL
Model
#
Diameter
 
 
 
Outside Dimensions
W
H
D
Std Power
(kW)
Max Load
(Lbs)
Ship Weight
(Lbs)
TBU1224
 
12
 
32
42
82
36 800
TBU1236
 
12
 
32
42
94
40 900
TBU1248
 
12
 
32
42
106
46 1000
TBU212
 
2
 
20
30
34
4 300
TBU224
 
2
 
20
30
52
7 350
TBU26
 
2
 
20
30
28
4 250
TBU512
 
5
 
24
34
42
9 350
TBU524
 
5
 
24
34
54
11 400
TBU536
 
5
 
24
34
66
15 450
TBU612
 
6
 
26
36
42
11 400
TBU624
 
6
 
26
36
54
14 450
TBU636
 
6
 
26
36
66
18 500
TBU648
 
6
 
26
36
78
20 600
TBU812
 
8
 
28
38
56
17 550
TBU824
 
8
 
28
38
60
20 600
TBU836
 
8
 
28
38
80
25 700
TBU848
 
8
 
28
38
92
28 800

Additional Features

DIGITAL PID CONTROL SYSTEM
The standard control system uses three separate Honeywell UDC 2500 digital PID 3 mode controls. One zero fired SCR for each zone is used for precise power control. Thermocouples are Type K with inconel sheathing. Thermocouples are typically located inside the tube and the controls are tuned to prevent overshoot. A Honeywell UDC 1200 digital high limit back up control with manual reset, back up contactors and separate thermocouple is included. The control voltage is transformed to 120 volts. All fuses, transformers, contactors and controls are located in a detached bench mounted NEMA 1 panel. Control and power circuits are branch 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. 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.
LOW MASS INSULATION
The furnace is insulated with 6 inches of low “K” factor ceramic fiber and mineral wool insulation. Two inches of this insulation consists of a removable molded element/insulation module that lines the interior of the furnace. It is not brittle and so maintenance is minimal. The insulation has a very low thermal mass and hence heats up very quickly. Heat up to 1800F (980C) will take approximately 45 minutes. No asbestos is used.
CERAMIC FIBER MOLDED ELEMENTS
Elements are embedded in ceramic fiber and are made of coiled iron-aluminum-chrome alloy. There are three separately controlled zones of heating with separate elements, one on each end and one in the center. Special versions feature even more zones than the standard three for greater uniformity or for special applications. The elements are preoxidized (which is what protects this particular alloy from the high temperatures.) Elements are replaced easily. The elements are evenly spaced along the entire surface of the interior and hence will provide the maximum in temperature uniformity by uniformly radiating along the surface of the tube. The insulation is fitted with vestibules at both ends. These protect the elements and help hold the tube in place. They hold heat in around tubes that are inserted into the furnace. The vestibules split open with the furnace case.
BENCH MOUNTED CASE CONSTRUCTION
The furnace case is constructed of welded 10 and 14 gauge steel. There is a detached control panel that contains all controls, control components and power supply. The case is primed with 800F silicone paint and finished in machine enamel. The hinged case splits open in the center from one side and latches closed on the other side.

Additional Options

ANGLE IRON FLOOR STAND
Includes braced angle iron legs with leveling bolts.
ATMOSPHERE CONTROL
Inert atmosphere and combustible atmosphere systems are both available. See H2 (hydrogen) and MPH (forming gas - hydrogen/nitrogen mix) which explain the various safety systems for hydrogen and forming gas atmospheres.
CERAMIC TUBES
Open both ends or closed one end
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.
TUBES AND RETORTS
Alloy retorts made of 304, 330 or 601 alloys, typically with water cooled “O” ring seals as well as ceramic and quartz tubes are available.

Downloads

Brochure For TBU