Multi Zone/split Tube Furnace

A multizone tube furnace is used when the requirement of the length of uniform hot zone is more than what can be obtained in a single hot zone tube furnace. It can also be used when the experiment requires multiple hot zones in a single hot zone tube. To achieve this, two or three hot zones of standard length are juxtaposed to have a lengthier hot zone and thus a  lengthier uniform temperature zone or two or more hot zones are placed some distance apart from one another. in such furnaces the heating zone can be continuous or there can be no “no heater zones” in between hot zones. 
In this kind of furnace a uniform hot zone of +/- 0.5° C can be obtained over length as high as few meters. 

A multizone furnace is also used when the user needs to maintain more than one different temperatures in more than one hot zones. The heating zones are separated by “no heater zones”.

In both cases, the heating zones can be controlled independently using independent control systems or a master zone can control other hot zones as slave zones..

Like a simple tube furnace, the hot zone can have controlled atmosphere or in vacuum.  As the name suggests, the multizone tube furnace houses a work tube made of either Alumina or Quartz depending on the temperature of operation. The work tube is equipped with gas tight stainless steel flanges on both ends for gas purging and vacuum applications.

The hot zones are heated using either metallic, Silicon Carbide or Molybdenum Disilicide heating elements. The hot zone is insulated by multiple layers of low thermal mass vacuum formed ceramic fibre boards of a grade commensurate with the maximum furnace operating temperature. The vacuum formed fibre boards together along with furnace duel body construction having forced air circulation between the outer and inner body ensures outer skin temperature below 60 C at the maximum furnace operating temperature. The furnaces are equipped using thyristor powered by automatic programmable PID controllers ensuring control accuracy of +/- 1° C. The outer bodies of the furnaces are duly powder coated for good appearance and longer life. In Single zone furnaces,  distribution of temperature follows a plateau curve inside hot zone. The distribution of temperature may improve with the use of radiation shields, increasing the length of the plateau in the curve. Temperature at end of hot zone is generally 15-20° C less than at centre of hot zone. 

The maximum operating temperature of these furnaces range from 600° C to 1600° C.

Multi Zone Tube furnaces can be customized as per user requirement.