Oval tube heaters

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Oval tube heaters are mainly used for efficiently heating tools and workpieces. In most cases the oval tube heaters are fixed to the tool by a clamping mechanism to keep the workpiece to temperature. Frequently, these heating elements are used to keep a plant section free from frost and/or the adjacent fluid (weir, rail or valve heating and the bottom heating of a tank as well).

Ex

Also available in explosion-proof design

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Dimension
Materials
Structure of the heating elements
Electrical connections
Control equipment

Oval tube heaters are available in the dimensions 16 x 6 und 12 x 5.5 mm.

Electrical oval tube heaters are produced of different materials. In most cases, these are corrosion-resistant stainless steel such as

  • 1.4307
  • 1.4541
  • 1.4571

but also corrosion-resistant alloys such as

  • 1.4876

Oval tube heaters consist of a tube with a flat oval cross section where the heating coil is in its middle and converts electrical energy in thermal energy. This heating coil is fixed by a highly heat-resistant ceramic material (magnesium oxide) and is electrically insulated against the heating element sheath at the same time. The compacting process makes sure that the heater coil is held in position and can well dissipate its thermal energy to the outside.

A moisture-proof sealing compound protects the electrical connection of the tubular heater from influences from the environment.

A variety of designs is available for oval tube heaters. We are prepared to agree with you on the variant suitable for your application, considering factors such as temperature, mechanical load and environmental influences.

I. Electrical connections

  • Glass-silk-insulated nickel wire for temperature of up to 250°C
  • Teflon-insulated nickel wire for temperatures of up to 220°C and moisture-proof design
  • Feeder protection of a glass-silk hollow tube, metal mesh or corrugated metal hose, gas-tight available as well.

II. Mechanical designs

  • Fastening strip
  • Fastening flange
  • Screw-in thread, metric or Imperial

Wherever heating is required, control is also necessary in almost all cases. We are of course prepared to deliver the corresponding controller for your heating cartridges. There are different variants of control which can be selected according to the desired quality.

I. Controllers

  • Electronic ON-OFF control or PID control. (-> ON-OFF control switches off the heater if the temperature is exceeded, and switches it on again when the temperature falls below its lowest value. Thus, the temperature will always oscillate around the setpoint. The algorithm of the PID controller will optimally compensate the control fluctuations.)
  • Load switching by contactors or wear-free semiconductors (thyristors). (-> contactors are wearing parts and must be replaced after approx. 100,000 make/break operations; thyristors switch quickly and without any wear but generate more heat losses than contactors.)
  • Electromechanical control.
  • Thermostats installed on the tool are price-efficient controllers whose accuracy is sufficient for many applications.

II. Sensors

  • Thermal protectors and limiters as capillary thermostats (as a safety design as well).
  • Temperature sensors for tool or heating cartridge temperatures
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