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Tubular heaters

General Information

Tubular heaters are compressed, metal sheathed heating spirals made of NiCr high-resistivity material in accordance with DIN 17470. Magnesium oxide (MgO) is used for insulation. Due to the high compression of the tubular heater, it is possible, even at high temperatures, to achieve excellent electrical insulation values and a high thermal conductivity.

Their fields of applications are very diverse. Tubular heaters may be used to heat water, oil, acids, alkaline solutions and air as well as for contact heating of surfaces.

Operating Conditions and Safety Instructions

Depending on the field of application, the selection both of the sheath material and the specific surface load is decisive for the operational safety of the tubular heater. It is necessary to make sure that the relevant fire safety instructions are observed and the appropriate safety precautions have been taken. Both the heater and the material to be heated may not be subjected to any critical conditions (such as fire, explosion, formation of smoke and gas, etc.).

Only suitable heat-resistant cable sets may be used due to the high temperatures. It is also necessary to ensure that sufficient protection is provided against contact, dust and moisture.

Nonconforming installation and incorrect selection of control equipment may result in defects and accidents. Any other conditions of use or diverting from the intended use must be clarified with the manufacturer who must give his express approval. Otherwise the warranty is void and no liability will be assumed.

Installation Instructions

Tubular heaters are delivered annealed so they can be bent. It is necessary to inform us at the time of ordering if you plan on bending the tubular heaters. The tube material may not be damaged by blows of a hammer or notches. Once a heater has been bent, it may not be bent again at the same location.

Moreover, it is possible to braze the tubular heater into a wall of a vessel or a flange with the aid of silver solder. The spots to be brazed must be free of grease and oxidation in order to ensure a flawless bond and to prevent corrosion. Brazing temperature may not exceed 700°C. Make sure that the connections do not get hotter than 200°C during brazing or subsequent use. Otherwise the moisture-proof connections will be destroyed and withstand strength and insulation resistance adversely affected.

Electrical Installation

The heater may only be installed by an authorized electrician or qualified personnel who have had proper instruction.

Make sure that the indicated operating voltage matches the supply voltage. Heat-resistant cabling must be used for all connections (see Operating Conditions and Safety Instructions). Cables must be installed in such a way that they do not come in contact with sharp-edged metal parts or hot surfaces.

VDE Specifications

The product was manufactured according to the following standards to the extent in which they may be applicable:

   DIN-EN 60335-1

   VDE 0700 Part 1

Comment: The user must ensure that electrical connections are protected to prevent accidental contact.

The production of these tubular heaters is certified according to the
DIN-EN ISO 9001:2008 via TÜV Thuringia

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Gebr. Bach GmbH

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