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Sigma Thermal - Water/Salt Bath Heater
The bath solution is heated by a fire tube style burner submerged at the bottom of the heater vessel. Water-glycol mixtures are very common solutions for most low-temperature heating applications, and can typically be used up to 250F.
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The principals of operation of a salt bath heater are similar to that of a water bath heater. A fire tube burner is submerged at the bottom of the heater vessel with a process coil submerged at the top. In lieu of water or water-glycol a molten salt is used. Molten salts can be used at much higher operating temperatures; as high as 1,000F. The higher operating temperature capability does come with challenges. The freezing point of these salts can be close to 300F.