Two types of heaters are available
(1) Tubular type (2) Rod type.
(1) Tubular type heaters consist of 9 Nos. tube elements fixed on
a terminal box, it has one supported bar in the middle which is longer
than rube elements, sheathing of heater is m.s. or s.s. helical coil
of resistance wire duly embedded in refractory material inserted into
the sheathing.
(2) Rod type heater-resistance wire wound coil supported by porcelain
blocks is inserted into the perforated tube. Terminals are in the
flange at one end of tube, another end is provided with supporting
bar.
This type of heaters have facility of quick replacement of
element thus production does not suffer.
|