Air heater

for gasfor liquids

Product overview
Ceramic bobbin heaters are steatite-based heating elements designed for direct air heating or for installation inside radiation tubes for indirect heating. They are assembled from ceramic segments to reach the required length; each segment includes recesses that house exposed heating coils, protecting the coil from chassis contact and ensuring reliable electrical insulation.

Design and electrical insulation
The open heating coil is positioned within ceramic recesses so it does not contact the metal chassis. This construction maintains good electrical insulation and allows flexible assembly of segments to meet length and shape requirements for free installation or in-tube mounting.

Indirect heating and mounting
These heaters are commonly used for indirect heating of liquids, air and gases when placed inside removable radiation tubes. Tubes are installed into the medium so the heater can be serviced or replaced without emptying or opening the tank. Tubes can be supplied with flanges or threads and can be fitted with built-in sensors, thermostats or limiters and custom connection boxes.

Applications and designs
Typical applications include hot air ovens, industrial baths and tanks, oil heaters, air heaters and boilers. Ceramic bobbin heaters are available in cylindrical and rectangular constructions and can be adapted to process-specific requirements.

Related products

• Over the side heaters
• Hydraulic oil heater
• Immersion heaters (oil)
• Immersion heaters (water)
• Tubular heaters

Technical specifications

• Surface load up to 3.5 W/cm²
• Maximum operating temperature up to 700°C
• Supply customizable; internal Δ- or Y-connection available
• Common diameters ø26 mm, ø36 mm, ø46 mm and ø58 mm
• Diameter tolerance ±1.5 mm
• Connection options: M-thread, pin or cable