These heaters are used in electroplating industries and are operatd vertically. Sheathing type of heaters have quartz silica tube sheathing, closed from bottom, rubber caps with terminal wires are mounted on the top, heating element wire-wound coil is wound around a porcelein tube, turns of the coil are separated by insulating beads, so that the element cannot sink heater terminals are fixed very firmily with the outer wires. Standard sizes and capacities include lenght of 12, 18, 30 and 36, capacity of 240 v, 1000 w to 4000 w; and terminal wire length of 1.5 mtres.
