Stainless steel heaters are ideal for use in phosphating solutions and in solutions with an alkaline or neutral PHvalue. Certain acidic chemical processes recommend the use of stainless steel tanks but this does 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.

  7Kw *3Kw 5Kw 4Kw 3Kw *1,5Kw 3Kw *1,5Kw 2Kw 1,5Kw 1Kw
Lmm 1500 1500 1000 1000 1000 1000 750 750 600 500 300
Cmm 350 350 250 250 250 250 250 250 200 200 100
Hmm 1150 1150 750 750 750 750 500 500 400 300 200
Dmm 40 40 40 40 40 40 40 40 40 40 40

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 length in increments of 25 mm with hot and cold zones to suit any application by using a 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 at 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 transferred up the sheath resulting in the melting of the PVC cap and the sheath falling out. In the case of the Vitrosol heater subsequent thermal shock could cause the sheath to crack. It is important therefore to maintain the correct solution level 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.

*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 a rapid build-up of phosphate sludge on the heater tube which forms an insulating.

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