Produkty

Tubular flat heating elements

 

Tubular flat heating elements (flat heating rods) are recommended for use in a wide range of applications due to their shaping. For the option of one and two ended termination of rods or locating a thermocouple inside the rod, see  the choice of connections for individual rod profiles.

Produced profiles: 21 mm x 6.5 mm; 16 mm x 6.5 mm; 13 mm x 5.5 mm; 12.5 mm x 6.3 mm; 12 mm x 6.5 mm; 10.5 mm x 4.5 mm; 9 mm x 4 mm.

 

Specification of flat heating rods

Rod profile (mm) 9 x 4 10.5 x 4.5 12 x 6.5 12.5 x 6.3 13 x 5.5 16 x 6.5 21 x 6.5
Maximum recommended voltage 240 V 240 V 400 V 400 V 400 V 400 V 400 V
Maximum recommended current per spiral 10 A 12 A 16 A 16 A 16 A 12 A 16 A
Maximum length 3,000 mm 3,000 mm 6,000 mm 6,000 mm 6,000 mm 6,000 mm 6,000 mm
Tolerance of the length of the rod +/-2 mm +/-2 mm +/-2 mm +/-2 mm +/-2 mm +/-2 mm +/-2 mm
Tolerance of the width of the profile +/-0.2 mm +0.3/-0.2 mm +0/-0.3 mm +0/-0.3 mm +/-0.6 mm +0/-1 mm +0/-1 mm
Tolerance of the profile thickness +0.1/-0.3 mm +0/-0.4 mm +/-0.3 mm +/-0.3 mm +0.1/-0.3 mm +0.5/-0 mm +0.5/-0 mm

The value of the maximum recommended electric current does not apply to all types of outlets.

Input power tolerance:

  • +5%/-10% above 200 W of the nominal input power (measured at working temperature).
  • +10%/-10% up to 25 W – 200 W of the nominal input power (measured at working temperature).

The sheath material and the recommended watt density of the heating rods (W/cm2) is stated according to the working conditions for the element (see Heating gases, liquids, and solid substances).

Materials used for the sheath: AISI 304, AISI 321, AISI 316L, AISI 316Ti, INCOLOY 800, steel 11 353, copper, aluminium (all materials are immediately available or from a technological viewpoint, only applicable to profiles 12.5 mm x 6.3 mm and 12 mm x 6.5 mm).

For the application for heating gases, there is the option to pack profiles 12.5×6.3, 12×6.5 with a stainless strip to increase the area of the heat passage into the space and to increase the service life of the rod or the maximum recommended value of the watt density of the rod for specific working conditions (see Heating of gases).

For more information, or in the case of other parameters than those mentioned above, please contact us.

Standard methods for cementing tubular elements

Polyurethane sealant (up to 135 °C) – is used for elements with low working temperature, e.g. heating water.

Epoxy resin (up to 146 °C) – reports higher mechanical resistance compared with polyurethane sealants.

Silicone sealant (guaranteed up to 275 °C) – elements for air. Not suitable for applications requiring increased resistance to humidity.

High temperature epoxy resin  – air and liquids up to 250 °C.

Ceramic sealant (up to 1,500 °C) – application with high working temperatures. Not suitable for applications requiring increased resistance to humidity.

Construction restriction

06-b

Rod profile (mm) 9×4 10.5×4.5 12×6.5 12.5×6.3 13×5.5 16×6.5 21×6.5
Minimum radius of bending “on flat” Rpmin (mm) 10 10 10 10 10 13 18
Minimum radius of bending “to the high” Rpmin (mm) 15 15 15 15 20 25 75
X (mm) 13 20 25 25 25 40 50
Y (mm) 25 25 30 30 30 40 60

Connection versions

06-a-1 06-a-2 maximum_22x65

Standard methods of electrical connection – flat tubular elements

1) Outlet design: Nickel (brass) wires. Applicable for all profiles for flat heating rods.

connection-tubular-flat-elements-01

2) Outlet design: Outlets with insulation are connected outside the heating rod. Applicable for all profiles for flat heating rods.
Conductors with PVC insulation and copper core (maximally up to 70°C).
Conductors with silicon insulation and copper galvanized core (maximally up to 180°C).
Conductors with Teflon insulation and copper galvanized core (maximally up to 205°C).
Conductors with Teflon insulation and nickel core (maximally up to 260°C).
Conductors with glass-textile insulation and nickel core (maximally up to 350°C).
Conductors with mineral insulation and nickel core (maximally up to 450°C).
Option to use epoxy resin filling (temperature in the place of the filling, a maximum of 250°C) – resistant to humidity and contamination by oil, etc.

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3) Outlet designs: Nickel wire with ceramic insulation (maximally up to 450°C). Applicable for all profiles for flat heating rods.

connection-tubular-flat-elements-03

4) Outlet design: Nickel wire.
Option to use epoxy resin filling (temperature in the place of the filling, a maximum of 250°C) – resistant to humidity and contamination by oil, etc. Applicable for all flat heating rod profiles.

connection-tubular-flat-elements-04

5) Outlet design: Waterproof and resistant to damage by frequent bending of the cable supply.
Three-core cable with rubber insulation and copper core (maximally up to 60°C). Not applicable for flat heating rod profiles 16 mm x 6.5 mm and 22 mm x 6.5 mm.

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6) Outlet design: Connection of three-core cable:
Three-core cable with rubber insulation and copper core (maximally up to 60°C).
Three-core cable with PVC insulation and copper core (maximally up to 70°C).
Not applicable for flat heating rod profiles 16 mm x 6.5 mm and 22 mm x 6.5 mm.

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7) Outlet design: Three-core cable with silicon insulation and copper galvanized core (maximally up to 180°C). Not applicable for flat heating rod profiles 16 mm x 6.5 mm and 22 mm x 6.5 mm.

connection-tubular-flat-elements-07

8) Outlet design: Conductors with glass-textile insulation inserted into the heating rod and nickel core (maximally up to 350°C). Applicable only for flat heating rod profiles 12 mm x 6.5 mm and 12.5 mm x 6.3 mm.

connection-tubular-flat-elements-08

9) Outlet design: Rod with the profile 12 x 6.5 mm, 12.5 x 6.3 mm or 13 x 5.5 mm – Three-core cable with metal braid and glass-textile insulation and nickel core (maximally up to 350°C). Not applicable flat heating rod profiles 9 mm x 4 mm, 16 mm x 6.5 mm and 22 mm x 6.5 mm.

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