Tempco Custom Heater Manufacturing

Mi-Plus Band Heater Specifications and Tolerances

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: 10A
  • Screw Terminations:
  • 8-32UNF—20A
  • 10-32UNF—25A

Resistance Tolerance: +10%, –5%

Wattage Tolerance: +5%, –10%

Caution: 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
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
11⁄2  38.1 1  to  14  25.4  to  355.6 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
2  50.8 11⁄2  to  14  38.1  to  355.6 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
21⁄2  63.5 11⁄2  to  14  38.1  to  355.6 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
3  76.2 11⁄2  to  14  38.1  to  355.6 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
31⁄2  88.9 13⁄4  to  14  44.5  to  355.6 21⁄2  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 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
41⁄2 114.3 21⁄4  to  14  57.2  to  355.6 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
5 127 21⁄2  to  14  63.5  to  355.6 21⁄2  to  14  63.5  to  355.6 3  to  25  76.2  to  635.0
51⁄2 139.7 23⁄4  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
61⁄2 165.1 31⁄4  to  14  82.6  to  355.6 31⁄4  to  14  82.6  to  355.6 31⁄4  to  25  82.6  to  635.0
7 177.8 31⁄2  to  14  88.9  to  355.6 31⁄2  to  14  88.9  to  355.6 31⁄2  to  25  88.9  to  635.0
71⁄2 190.5 33⁄4  to  14  95.3  to  355.6 33⁄4  to  14  95.3  to  355.6 33⁄4  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

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607 North Central Avenue
Wood Dale, IL 60191-1452 USA
Phone: 630.350.2252   Toll Free: 888.268.6396
Fax: 630.350.0232   Email: info@tempco.com

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