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Resistance Level Detectors detects level changes by the change in resistance of a partially submerged electrical element. The sensor strip remains fixed in position, has no moving parts and provides a continuous indication of resistance. The wingdings these sensors are purely resistive, they cannot store or release electrical energy. Thus resistance sensors qualify as intrinsically safe devices and can be used with explosive liquids and dust. Resistance type level detectors use the electrical relationship between resistance and current flow to accurately measure level. The most common design uses a probe consisting of two conductive strips.