Ceramic Band Heater Specifications and Tolerances
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 | |
|---|---|---|---|
| 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 | |||
|---|---|---|---|---|---|---|
| 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
