Tubular heater specifications and Tolerances
Electrical Limitations and Minimum/Maximum Sheath Lengths
| Element Diameter | Maximum Voltage | Maximum Amperage | Resistance in Ohms per Heated Inch | Sheath Length | |||||
|---|---|---|---|---|---|---|---|---|---|
| min. | max. | ||||||||
| in | mm | min | max | in | mm | in | mm | ||
| 0.26 | 6.6 | 250 | 15 | 0.1 | 17 | 11 | 279 | 200 | 5080 |
| 0.315 | 8.0 | 480 | 30 | 0.06 | 21 | 11 | 279 | 200 | 5080 |
| 0.375 | 9.5 | 600 | 30 | 0.04 | 21 | 11 | 279 | 200 | 5080 |
| 0.43 | 10.9 | 600 | 40 | 0.04 | 21 | 11 | 279 | 255 | 6807 |
| 0.475 | 12.1 | 600 | 40 | 0.04 | 21 | 11 | 279 | 255 | 6807 |
| 0.625 | 15.9 | 600 | 40 | 0.04 | 17 | 11 | 279 | 255 | 6477 |
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Sheath and Heated Length Tolerance (applicable for all diameters)
| Length | Sheath Length Tolerance (±) | Heated Length Tolerance (±) | Minimum Unheated Length Each End | ||||
|---|---|---|---|---|---|---|---|
| in | mm | in | mm | in | mm | in | mm |
| 11-20 | 279-508 | 3/32 | 2.4 | 1/4 | 6 | 1 | 25 |
| 20-50 | 508-1270 | 1/8 | 3.2 | 1/2 | 13 | 1–1/4 | 32 |
| 50-80 | 1270-2032 | 5/32 | 4 | 7/8 | 22 | 1–1/2 | 38 |
| 80-110 | 2032-2794 | 3/16 | 4.8 | 1–1/8 | 29 | 1–5/8 | 42 |
| 110-140 | 2794-3556 | 7/32 | 5.6 | 1–3/8 | 35 | 1–3/4 | 44 |
| 140-170 | 3556-4318 | 1/4 | 6.4 | 1–5/8 | 41 | 2 | 51 |
| 170-200 | 4318-5080 | 3/8 | 9.5 | 1–7/8 | 48 | 2–1/4 | 57 |
| 200-up | 5080-up | 1/2 | 12.7 | 2–3/8 | 60 | 2–1/2 | 64 |
Tubular Element Minimum Bending Radius
| Element Diameter | Factory Bend | Field Bend | |||||
|---|---|---|---|---|---|---|---|
| Minimum R | Minimum R | Minimum S | |||||
| in | mm | in | mm | in | mm | in | mm |
| 0.260 | 6.6 | 3/8 | 9.5 | 3/4 | 19.1 | 1/2 | 12.7 |
| 0.315 | 8.0 | 1/2 | 12.7 | 1 | 25.4 | 1/2 | 12.7 |
| 0.375 | 9.5 | 9/16 | 14.3 | 2 | 50.8 | 5/8 | 15.9 |
| 0.43 | 10.9 | 3/4 | 19.1 | 2–1/2 | 63.5 | 3/4 | 19.1 |
| 0.475 | 12 | 7/8 | 22.2 | 2–1/2 | 63.5 | 1 | 25.4 |
Note: Smaller inside bending radius’s not listed can be factory accomplished. It requires special forming techniques to prevent damage to the tubular heater. Consult Tempco with your requirements.
Avoid bends within a minimum of 1/2″ of the terminal pin and resistance wire junctions unless the bending radius is a minimum 3″(75 mm).
