Calibrated thermal sensing system utilizing resistance varying jumper configuration
The warming article contains a heating element and a sensing system. The sensing system has a first sensor element being a temperature dependent variable resistor and a second sensor element having at least two resistors in series and corresponding jumpers for one or more resistors in the second sensor element. The first sensor element is linear and flexible and the second sensor element is used to adjust the total sensor resistance to a fixed value at a particular temperature.
1. A warming article comprising a fabric, a heating element incorporated into the fabric and, a sensing system, wherein the sensing system comprises
a first sensor element being a temperature dependent variable resistor, wherein the temperature dependent variable resistor is linear and flexible and is incorporated into the fabric; and,
a second sensor element being a temperature independent variable resistor comprising a combination of at least two resistors in series and corresponding jumpers for each of the resistors in the second sensor element.
2. The warming article of claim 1 , wherein the first sensor element is electrically connected in series to the second sensor element.
3. The warming article of claim 1 , wherein the first sensor element is electrically connected in parallel to the second sensor element.
4. The warming article of claim 1 , further comprising a third sensor element being a variable resistor, wherein the first sensor element is electrically connected in parallel to the third sensor element and wherein the second sensor element is electrically connected in series to the combination of the first sensor element and the third sensor element.
5. The warming article of claim 1 , further comprising a third sensor element being a variable resistor, wherein the first sensor element is electrically connected in series to the second sensor element and wherein the third sensor element is electrically connected in parallel to the combination of the first sensor element and the second sensor element.
6. The warming article of claim 1 , wherein the first sensing element is an electrically conductive wire.
7. The warming article of claim 1 , wherein the second sensor element comprises at least three resistors in series and corresponding jumpers for each resistor.