Abstract: A proximity sensor module includes a housing; and a proximity sensor disposed in the housing, wherein the proximity sensor comprises a sensor plate configured to contact inside of the housing such that substantially no gap exists between the sensor plate and the housing. The housing may be a substantially explosion-proof housing. The housing may include two members coupled by a thread engagement, wherein a sensor plate of the proximity sensor is placed off-center with respect to an axis of rotation for the thread engagement.

Abstract: A proximity sensor module includes a housing; and a proximity sensor disposed in the housing, wherein the proximity sensor comprises a sensor plate configured to contact inside of the housing such that substantially no gap exists between the sensor plate and the housing. The housing may be a substantially explosion-proof housing. The housing may include two members coupled by a thread engagement, wherein a sensor plate of the proximity sensor is placed off-center with respect to an axis of rotation for the thread engagement.

Abstract: In one embodiment, a proximity sensor is disclosed. The proximity sensor is adapted for use in a housing, such as an explosion-proof housing, and includes a compressible sensor plate and an interface board. The sensor plate is compressed during assembly of the housing. The proximity sensor interacts with other electrical components within and external to the housing. Furthermore, the proximity sensor may include, or interact with, a display. Components, including the proximity sensor, may be configured for use in a hazardous environment and designed to draw minimal current.

Abstract: A system of leak detection in an impoundment including a first impoundment layer containing a brine solution, a second impoundment layer positioned beneath the first impoundment layer and having a brine-filled space therebetween, a first electrode positioned in the brine-filled space, an injection electrode positioned in the brine solution on the first impoundment layer, a plurality of sensor elements extending outwardly from the injection electrode for measuring electrical potentials at points distal the injection electrode, and a source of power electrically connected to the first electrode and to the injection electrode for passing a current between the electrodes. A probe assembly is connected to the injection electrode for supporting the injection electrode above the first impoundment layer. The sensor elements are arranged generally coplanar to the injection electrode. Each of the sensor elements are separated by an equal distance from an adjacent sensor element.