Abstract: A water sensor buoy for use in a water environment includes an elongate tubular case with a case body with a case interior and a case exterior surface. A water sensor is in the case interior adjacent a sensor case end and exposed to the water environment. The water sensor senses an attribute of the water environment. A float is removably attached to the case exterior surface and positionable along the case body to offset the water sensor from the float. A data processing and control unit is in electronic communication with the water sensor to generate a data signal upon receipt of sensor data. An antennae supported by the tubular case in the case interior. A data transmission unit is in electronic communication with the data processing and control unit to wirelessly transmit a data signal generated by the data processing and control unit using the antennae.

Abstract: A water sensor buoy for use in a water environment. The buoy including a buoy hull, a data processing and control unit, a data transmission unit, a power source, a water sensor, a wiper wheel with a wiper to slidably engage the exterior sensor surface upon rotation of the wiper wheel for removal of particulates disposed upon the exterior sensor surface, a water pump and a water jet outlet to direct a water stream at the exterior sensor surface for removal of particulates disposed upon the exterior sensor surface.

Abstract: An improved luminescent optode is disclosed that is capable of conducting a self-test to determine the quality of the optode's measurement of the concentration of a quenching molecule in a fluid, along with a method for conducting the self-test.