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: 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 10″ dia. – 1/2″
- 10″ to 16″ dia. – 5/8″
- greater than 16″ 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 |
| 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 |
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