Temperature controller for hybrid process tanks

Abstract

Abstract A temperature-regulating system to maintain the temperature of liquid containers in a hybrid process tank at a desired level, the vessel being constituted by an inner plastic vessel and an outer metallic jacket provided with heater elements. The jacket functions as a heat distributor to uniformly distribute the thermal energy applied to the interface of the vessel and the jacket, which energy is transferred by the plastic vessel to the liquid at a relatively slow rate. In order to raise the temperature of the liquid to the desired level and to maintain the liquid at this level without overheating and damaging the vessel, the system includes a first temperature-sensing resistor disposed at the interface of a heated plate and the plastic vessel, and a second temperature-sensing resistor immersed in the liquid, whereby the resistance of the first sensor reflects the quickly rising interface temperature and the resistance of the second sensor reflects the slowly rising liquid temperature. The two sensors are connected in series in one arm of a bridge that controls the application of power to the heater elements, the power being turned off when the bridge output determined by the ratio of the resistances of the sensors, attains a null.

Inventors

• 👤 G Krenke
• 👤 H Layton

Bibliographic Details