Mi-Plus Band Heater Specifications and Tolerances

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Performance Ratings

Maximum Temperature: 1400°F (760°C)

Nominal Watt Density:
Nozzle Bands — under 3" diameter: 30-100 W/in2 (4.7-15.5 W/cm²)
Barrel Bands — 3" and greater in diameter: 20-70 W/in² (3.1-10.9 W/cm²)

Maximum Watt Density: 150 W/in² (23 W/cm²)
Dependent on heater size, operating temperature and termination.

Electrical Ratings

Maximum Voltage: 480VAC per termination

Dual Voltage: Available depending on heater configuration

Maximum Amperage:

Lead Wire Termination: 12.5A
Screw Terminations:
8-32UNF—20A
10-32UNF—25A

Resistance Tolerance: +10%, –5%

Wattage Tolerance: +5%, –10%

Exposed electrical wiring on band heater installations is a violation of Electrical Safety Codes including O.S.H.A.

Physical Size Construction Limitations

Nominal Gap—Built-In Bracket:

less than 1-3/4" dia. – 1/4"
1-3/4" to 2" dia. – 5/16"
2" to 5" dia. – 3/8"
5" to 18" dia. – 1/2"
greater than 18" dia. – 3/4"
If a larger gap is required for probes or thermocouples, specify when ordering.

Maximum Inside Diameters:

One-Piece –*14" (355.6 mm)
One-Piece Expandable – *14" (355.6 mm)
Two-Piece – 25" (635.0 mm)
Over 25" (635.0 mm) will require multiple segments. Consult TEMPCO.

* Tempco recommends two-piece construction for heaters 10" ID and greater

Standard Widths: 1" to 8" (25.4 mm to 203.2 mm)

Width Tolerance: ±3/32" (2.4 mm)

Note: If non-standard widths or tighter tolerances are required, consult Tempco.

Additional Limitations

For heaters less than 4" in diameter, the maximum width is twice the diameter.
Heaters with standard brackets are available from 1" to 8" wide, while heaters with low profile brackets are available from 1" to 6" wide.
1" diameter heaters are only available in 1" and 1-1/2" widths.
For heaters from 10" diameter up to 25" diameter, Tempco recommends using 2-piece construction for superior clamping. Over 25" diameter, 3 or 4 segments are recommended.
Combinations of some minimum and maximum variations may not be available. Consult Tempco with your special requirements.
Post terminals are only available on heaters greater than 2-1/2" in diameter and 1-1/2" in width.

Diameter/Width Limitations

Width		One-Piece Construction		Expandable Construction		Two-Piece Construction
Width		Inside Diameter		Inside Diameter		Inside Diameter
in	mm	in	mm	in	mm	in	mm
1	25.4	1 to 10	25.4 to 254.0	n/a	n/a	3 to 25	76.2 to 635.0
1-1⁄2	38.1	1 to 14	25.4 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
2	50.8	1-1⁄2 to 14	38.1 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
2-1⁄2	63.5	1-1⁄2 to 14	38.1 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
3	76.2	1-1⁄2 to 14	38.1 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
3-1⁄2	88.9	1-3⁄4 to 14	44.5 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
4	101.6	2 to 14	50.8 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
4-1⁄2	114.3	2-1⁄4 to 14	57.2 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
5	127	2-1⁄2 to 14	63.5 to 355.6	2-1⁄2 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
5-1⁄2	139.7	2-3⁄4 to 14	69.9 to 355.6	3 to 14	63.5 to 355.6	3 to 25	76.2 to 635.0
6	152.4	3 to 14	76.2 to 355.6	3 to 14	76.2 to 355.6	3 to 25	76.2 to 635.0
6-1⁄2	165.1	3-1⁄4 to 14	82.6 to 355.6	3-1⁄4 to 14	82.6 to 355.6	3-1⁄4 to 25	82.6 to 635.0
7	177.8	3-1⁄2 to 14	88.9 to 355.6	3-1⁄2 to 14	88.9 to 355.6	3-1⁄2 to 25	88.9 to 635.0
7-1⁄2	190.5	3-3⁄4 to 14	95.3 to 355.6	3-3⁄4 to 14	95.3 to 355.6	3-3⁄4 to 25	95.3 to 635.0
8	203.2	4 to 14	101.6 to 355.6	4 to 14	101.6 to 355.6	4 to 25	101.6 to 635.0