Abstract: A method and systems for disengagement of a chain and sprocket actuation system is provided. In one version, an actuation system mechanically couples a motor with a rotatable feature. The rotatable feature may be a threaded stem that alternately raises and lowers a gate as the feature is rotated in a respective direction. A removable key comprised within the actuation key. When the key is removed from engagement with the motor, that rotatable feature is decoupled from the motor. A manual fixture, such as a wheel, may be used to rotate the rotatable feature by hand. The rotatable feature may thus be driven by the motor, or alternately decoupled from the motor and driven by hand.

Abstract: The down hole and above ground data loggers according to the present invention can be used with any sensors or probes. The switching associated with different sensors is accomplished on a circuit board in the data logger using an external device. The data loggers can send data to the external device via hard wire or radio frequency. Sending the data via radio frequency eliminates the need for a user to go out to the field. Thus, the user can obtain real time and historical data without having to go out to the field. In one embodiment, a down hole data logger is disclosed that is capable of being installed or deployed in small openings. In another embodiment, an above ground data logger is disclosed. In both embodiments, the data loggers can record analog sensor data or discrete data. The data loggers of the present invention are easy to use, reliable, accurate, cost efficient, and feature rich.