Sweden trading corporation providesoffers bobbin type heaters, also known as open refractory heaters. These heaters are widely used as immersion heaters or as air heaters by selecting appropriate sheath materials for heating various types of chemicals, oils and water or air and gases. When low watt density is required, these heatersy are specially recommended when low watt density is required and where it is difficult to drain out the entire liquid from tank for replacement of heaters. These heaters are also available with variety of sheath materials like: titanium, stainless steel [304, 316, 316l, 321 and 321l], lead covered tube, zinc plated mild steel and quartz glass tube for heating liquids, available with perforated or finned tubes for air heating, as per requirement. Some of the constructional feaures of the heaters include: they are available in various diameters and lengths as per customer specifications. However the standard diameters are from 8 mm od to 75 mm od. These heaters are designedy can be designed for vertical as well as horizontal installation with required heating and non heating zones and suitable to operate any voltage as per the requirement [from 60 v to 440 v]. These heaters are also available with variety of sheath materials like: titanium, stainless steel [304, 316, 316l, 321 and 321l], lead covered tube, zinc plated mild steel and quartz glass tube for heating liquids, available with perforated or finned tubes for air heating, as per requirement.
