Tubular elements
Introduction
Technical description
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Tubular elements


Products > Tubular elements > Technical description

Technical description :

A resistance wire is drowned into packed magnesia (MgO) and then heavily compressed using cold lamination. The highly resistant sheath protects the heating element from mechanical and chemical agressions. Connecting terminals are welded to resistance wire at both ends of element. An insulating ceramic bead protects the electrical circuit and improves electrical properties of heating element according to standards. 

BENDING :

Bending options available are infinite. We advise you to contact our R&D department when defining product specifications in order to choose the most economical technical solution.

 

SHEATH MATERIALS:
  Ø of sheath  
  6.5 8 10 13  
Aisi 309 X X X X Heat-resistant stainless steel. Very good resistance to corrosion in air up to 900°C (1652°F)
Aisi 316L X X X X Austenitic stainless steel. Very good resistance to intergranular corrosion in water.
Aisi 321 X X X X Basic austenitic stainless steel. Sheath temperature should not exceed 650°C (1202°F).
Incoloy® 800 X X X X Heat-resistant alloy resistant to temperatures up to 900°C (1652°C). Good resistance to corrosion in liquids except when in contact with chloride ions.
Incoloy® 825   X     Resistant to temperatures up to 900°C (1652°C). Good resistance to corrosion in reducing acids, sea and swimming pool waters.
Copper   X     Good resistance in water. Can be nickel-plated for better resistance to scaling.
 

 

CONNECTIONS :

Life span of heating element also depends on adequate connections. Temperature, ambient atmosphere, material splashes, movements and handlings have to be taken into account when defining specifications of heating element. Temperature on connections should not exceed 80°C (176°F). Our R&D department can help you to choose connection type required.

ND : Non available


Connection type Material E size depending on tube diameter  
6,4 6,5 8 8,5 10 13 14
Height of steatite bead « H » ± 0.2mm Steel 3,9/5   4,8 6 5,7/6 8 6
 Ø 2.5mm terminal pin 19 12   19 19    
Ø 3,5mm terminal pin     13   14 16 (NC>400)
 Ø 4,5mm terminal pin           16 (NC>400)
M4 threaded terminal Steel       19 19    
Screw lug plate w/clamp Stainless Steel   24 25   26 28  
Straight 6.35 lug plate Nickel -plated steel 23 21 22 23 23 25 23
90° bent 6.35 lug plate 15 10 11 15 15/12 14  
Double straight 6.35 lug 23 21 22 23 23 25  
Double 90° bent 6.35 lug 23 14 15 23 16/23 18  
HO7 RNF 1.5mm2 cable (11A max.) with shrink Copper core   20 21   22 25  
1.5mm2 11A hypalon neoprene              
Hypalon moulded (-55°C +120°C)   ND 21   ND ND  
E.P.D.M. rubber (max. temp. 60° on connections) 55     75     80
1.5mm2 11A glass fibre insulated cable Copper core   20 21   22 25  
2,5mm˛ 15A glass fibre insulated cable   20 21   22 25  
1mm˛ 6A glass fibre insulated cable Nickel core   20 21   22 25  
2,5mm˛ 7,5A glass fibre insulated cable   20 21   22 25  
2,5mm˛ 11A glass fibre insulated cable   20 21   22 25  
2,5mm˛ 15A glass fibre insulated cable   20 21   22 25  
4mm˛ 20A glass fibre insulated cable   20 21   22 25  
M4 end screw terminal Nickel -plated steel   ND 20   21 25  
M4 threaded terminal 24 24 23 19 24 ND  
M5 threaded terminal   ND 26   27 ND  
 M6 threaded terminal   ND 27   28 30 25
Ø5 pin terminal   ND 30   31 ND  
Ø6 pin terminal   ND 24   25 ND  
Flattened terminal with M6 bolt   ND 30   31 33  
Flattened terminal with M5 clamp   ND 30   31 33  

 

ELECTRICAL VALUES:

All power ratings and voltages are available provided specific watt densities are compatible with graph shown below and provided ohmic value per meter of length of heating element is within limits shown in below table or is validated by our technical department.

 

 
Ø Minimum Resistance
(W/m heating)
Maximum Resistances
(W/m heating)
6,5 3,5 1000
8 2 800
10 2 800
13 2,5 450

 

 

PROTECTION AGAINST ELECTRICAL SHOCK AND HUMIDITY
 

Our heating elements can be fitted with aluminium or polycarbonate enclosures and thermoplastic or rubber moulded terminal covers.