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Tubular Heater Specifications and Tolerances

Tubular heater specifications and Tolerances

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Electrical Limitations and Minimum/Maximum Sheath Lengths

Element Diameter		Maximum Voltage	Maximum Amperage	Resistance in Ohms per Heated Inch		Sheath Length
Element Diameter				Resistance in Ohms per Heated Inch		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

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
Element Diameter		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.

Bend Radius Drawing

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).

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