Ceramic BAND HEATER SPECIFICATIONS AND TOLERANCES

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Performance Ratings

Maximum Temperature: 1400°F (760°C)

Nominal Watt Density: 20-45 W/in² (3-7 W/cm² )

Maximum Watt Density: 45 W/in² (7 W/cm² )

Electrical Ratings

Maximum Voltage: 480 VAC per termination

Dual Voltage: Available depending on heater configuration

Maximum Amperage:

Lead Wire Termination: 12.5A
Screw Terminations: 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

Sheath Material: Stainless Steel

Insulation Material: Ceramic Fiber Blanket
Standard Insulation Thickness: 1/4" (6.4 cm)
Double Insulation Thickness: 1/2" (12.7 cm)

Overall Thickness:

Insulation Type	Dia. less than 4"	Dia. 4" or greater
Insulation Type	Standard	Standard	Optional
Standard	.5" (12.7 cm)	.625" (15.9 cm)	1/2" (12.7 mm)
Double	.688" (17.5 cm)	.75" (19.1 cm)	11/16" (17.5 mm)
Ribcage (Uninsulated)	.344" (8.7 cm)	.5" (12.7 cm)	11/32" (8.7 mm)

Minimum Width: 1" (2.54 cm)
Standard Width Increments: 1/8" (3.2 cm)
Consult Tempco for non-standard widths.
Maximum Width:

One-Piece & Two-Piece:
- Dependent upon the ratio of diameter to width
- Maximum Width to Diameter Ratio is 3:1
- Maximum Width for 5" or greater ID is 15"
Reverse Band: 4" (101.6 mm)

Width Tolerance:

1" (25.4 cm) to 3-1/2" (88.9 cm)	±1/16" (±1.6 cm)
4" (101.8 cm) to 6-1/2" (165.1 cm)	±1/8" (±3.2 cm)
Over 6-1/2" (165.1 cm)	±1/4" (6.4 cm)

Minimum Diameter:
One-Piece: 2" (50.8 mm)
Two-Piece: 4" (101.6 mm)
Reverse Band: 5-1/2" (139.7 mm)

Maximum Diameter:
One-Piece – 21" (533.4 mm)
Two-Piece & Reverse Band – 44" (1,117.6 mm)

Nominal Gap: 3/8" (9.5 cm) — If a larger gap is required for probes or thermocouples, specify when ordering.

If tighter tolerances are required consult Tempco.

Construction / Clamping	Min. ID		Min. Width		Max. ID
Construction / Clamping	in	mm	in	mm	in	mm
One-Piece	2	50.8	1	25.4	21	533.4
Two-Piece	4	101.6	1	25.4	44	1117.6
Reverse Band	5.5	139.7	1	25.4	44	1117.6
Standard Insulation	2	50.8	1	25.4	n/a
Double Insulation	2	50.8	1	38.1	n/a
Rib Cage (RCC)	3	76.2	1	114.3	n/a
Built-In Bracket	2	50.8	1	25.4	n/a
Built-In Bracket Spring Loaded	2	50.8	1	25.4	n/a
Latch and Trunnion	4	101.6	1	25.4	n/a
Bent-Up Flange	2	50.8	1	25.4	n/a
Shell Overlap	3	76.2	1	38.1	20	508.0

Note: Refer to individual Construction and Termination Descriptions (pages 1-66 through 1-74 in our catalog) for further information.
Actual heater minimums and maximums will depend upon the combination of construction/clamp, termination styles and electrical ratings.

Type R – Uninsulated Ceramic Band Heater Specifications and Tolerances

Performance Ratings

Maximum Watt Density: 50 W/in² (8 W/cm²)
Maximum Temperature: 900°F (482°C)

Mechanical Ratings

Standard Width Increments: 1/8" 3.2 cm
Maximum Width: depends on ratio of diameter to width
Minimum Width: 1" (25.4 mm)
Standard Gap: 3/8" ±1/8" (9.5 ±3.2 mm)

Electrical Ratings

Resistance tolerance: +10%, –5%
Wattage tolerance: +5%, –10%
Maximum Voltage: 480 single or 3-phase (when applicable)
Maximum Amperage:
Screw Terminals: 25 Amps per circuit
Lead Wire: 10 Amps per circuit