US Patent 7521639 Safety switch

A safety switch for sensing the level of water in a condensate pan has a molded plastic body with an attachment section and a float probe. The attachment section includes a collar that fits over and connects to the side edge of the condensate pan. The float probe comprises a hollow elongated housing with a grille opening to allow entry of water. A float, position within the hollow elongated housing, moves in response to entry of water into the elongated housing. The float includes a magnet that activates a reed switch mounted in a watertight compartment extending along one wall of the elongated housing. The float probe may be fixedly or adjustably attached to the molded body of the safety switch. For adjustable attachment, the float probe is snugly fit into the opening of a yoke so that the float probe can be raised or lowered or inclined with respect to the yoke.