A temperature control fluid circulating system for automatically heating and cooling a thermal blanket, said system comprising a fluid containing tank connected in fluid communicating relation with the thermal blanket, a pump means connected to both said fluid reservoir means and the thermal blanket and structured to create fluid flow therebetween;
- a temperature transfer means including at least one thermal module coupled directly to said reservoir means in temperature transfer relation relative thereto to selectively heat or cool fluid within said reservoir means, a temperature control means electrically connected to said temperature transfer means in controlled relation thereto, said temperature control means including a temperature sensing means operatively coupled to said fluid reservoir means to continuously monitor the temperature of the fluid contained therein and generate an output signal corresponding to the fluid temperature therein, an adjustable temperature selector including logic means to generate a signal corresponding to the selected temperature and control logic coupled to said temperature sensing means and said adjustable temperature selector and said thermal module to selectively heat or cool fluid within said fluid reservoir means;
- said control logic includes a first signal generator coupled to said temperature sensor and said adjustable temperature selector to receive signals simultaneously therefrom, said first signal generator including a logic means to selectively generate a cooling signal when the temperature of the fluid within said fluid reservoir means exceeds the selected temperature by a predetermined temperature and a heating signal when the temperature of the fluid within said fluid reservoir means is less than the selected temperature by a predetermined temperature;
- a second signal generator coupled to said temperature sensor and adjustable temperature selector to receive signals simultaneously therefrom, said second signal generator including logic means to selectively generate a cooling signal when the temperature of the fluid within said reservoir means exceeds the selected temperature by a second predetermined temperature and a heating signal when the temperature of the fluid within said fluid reservoir means is less than the selected temperature by a second predetermined temperature, said signals from first and second signal generators being fed directly to a state controller, said state controller includes logic means to generate a heating signal when said heating signals from said first and second signal generators are received, and a cooling signal when said cooling signals from first and second signal generators are received, said heating and cooling signals from said state controller are selectively fed directly to said thermal module to control the heating or cooling thereof;
- a power supply means defining at least in part an electrical power control circuit and being disposed in current regulating interconnection to said pump means, said temperature transfer means and said temperature control means.