YIWU JINBAO HEATING PRODUCTS FACTORY

The Hotrod

The above list is the standard range of Hotrod heaters. The elements are ceramic filled incoloy tubes contained within an outer sheath of either stainless steel, titanium or vitrosol glass. Specials can be made to any lenght in increment of 25mm with hot and cold zones to suit any application by using ceramic type element. Where possible it is advisable to install heaters in multiples of 3 in order to keep the phases balanced.

It is desirable to locate the temperature probe a a reasonable  distance from the heaters in order to obtain accurate control. Solution level must never be allowed to fall below the cold zone of the heater. In the case of stainless steel units the heat will be transfered up the sheath resulting in the melting of the PVC cap and the sheath falling out. In the case of Vitrosol heater subsequent thermal shock could cuase the sheath to crack. It is important therefore to maintain the correct solution levels at all times. This can be controlled automatically by the use of a level control unit used in conjunction with a solenoid operated valve to maintain the solution level, or as a safety device to isolate the heaters in the event of a rapid loss of solution.

VITROSOL
Vitrosol heaters are made from translucent fused silica wich has an extremely low co-efficient of expansion and is inert to most acids. This makes it the ideal choice for the heating of acid solutions.

Note: Vitrosol is a form of glass and must not be used in hydrofluerie acid or strong alkaline solutions. It also needs protection from mechanical dammage. This can best be effected by means of a polypropylene guard, or PVC in the case of chrome or nitric solutions.

TITANIUM
Titanium heaters can be used in a wide range of acid and alkaline solutions, but chemical attack does occur in some instances at varying rates, depending on the Temperature and concentration of the solutions. In electroplating proccesses such as nickel plating it is advisable to connect the Titanium sheath anodically to prevent corrosion.

STAINLESS STEEL 316
Stainless steel heaters are ideal for use in phosphating solutions and in solutions with an alkaline or neutral PH value. Certain acidic chemical processes recommended the use of stainless steel tanks but this not necessarily mean the use of stainless steel heaters. In these instances it is advisable to use Vitrosol heaters due to the chemical attack on stainless steel at the elevated surface Temperatures of the heater tube. In brass plating processes, liquid ammonia must be used, not ammonium chloride, as the chloride will attack the stainless steel sheath.

* In phosphating solutions it is advisable to use a multiple of low kilowatt heaters rather than one high kilowatt heater. This will lower the watts density and avoid rapid build-up of phosphate sludge on the heater tube wich forms an insulating crust and causes the element to overheat.