Fluid-heating apparatus, circuit for heating a fluid, and...

Details Fluid-heating apparatus, circuit for heating a fluid, and... Fluid-heating apparatus, circuit for heating a fluid, and...

2007-04-24

2007-04-24

Campbell, Thor S. (Department: 3742)

Electric resistance heating devices

Heating devices

Tank or container type liquid heater

C219S497000, C219S482000

Reexamination Certificate

active

11296053

ABSTRACT:
A fluid-heating apparatus for heating a fluid and method of operating the same. The fluid-heating apparatus includes a heating element for heating a fluid surrounding the heating element and a control circuit connected to the heating element and connectable to a power source. The control circuit is configured to determine whether a potential dry-fire condition exists for the heating element. The method includes applying a first electric signal to the heating element, detecting a first value of an electrical characteristic during the application of the first electric signal, applying a second electric signal to the heating element, applying a third electric signal to the heating element, detecting a second value of the electrical characteristic during the application of the third electric signal; and determining whether a potential dry-fire condition exists based on the first and second values.

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