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

 


 

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.

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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