Design considerations
Specify the medium and the site, not just the power.
Industrial elements run for thousands of hours a year, often at full load – material, surface load and terminal protection decide whether the installation is maintenance-free.
Materials
AISI 304 and 321 for air, Incoloy 800 for saunas and high-temperature air, AISI 316L for process liquids. Chemically loaded baths need the sheath stated on the drawing, never assumed.
Watt density on the heated sheath
Water, oil, glycol, alkaline baths, still or moving air and metal contact each set their own ceiling. An element that is right for one medium can be wrong – sometimes dangerously – for the next.
Sealing and terminal protection
Terminal boxes face washdown, condensation, dust, vibration and ambient temperatures from freezer rooms to foundries. Ingress protection, terminal insulation and cable entry are specified, not assumed.
Equipment standards
Typical for the finished equipment: EN 60335-2-53 (sauna heaters), 2-30 (room heaters), 2-40 (heat pumps and air conditioners); EN 60519 / IEC 60519 for industrial electroheating; VDE for approved element families; RoHS, REACH; CE marking of the finished appliance.
Validation and documentation: every element passes the 100 % series test – resistance, dielectric strength and insulation resistance. Series parts are validated with leakage current, corrosion and salt spray, heating uniformity and a life test; small series ship with a drawing for approval, a material certificate and a test report.
How we test – quality and laboratory