Abstract: A processor controlled supervisory apparatus for a liquid level controller of a feedwater heater obtains DCA characteristics and breakpoints thereof in a programmed manner. A plurality of DCA characteristics are obtained for a plurality of load conditions, and the breakpoints and other operating parameters are stored in a database correlating operation parameters with load conditions. Equations describing the relationship between the parameters and the load conditions are determined by the programmed processor and additional data points determined therefrom to provide load-responsive control for liquid level setpoint. A retrofitting apparatus retrofits the inventive supervisory control apparatus onto existing liquid level controllers.

Abstract: A sampler for sampling granular material moving through a pipe includes a housing which is mounted on the pipe, and a probe having an open front end and a hollow rearwardly divergent interior movably mounted within the housing. A pair of pneumatic cylinders selectively move the probe between a retracted position within the housing and an extended position within the pipe. A pneumatic vibrator is mounted on the probe for selectively vibrating the probe providing for penetration of the granular material within the pipe and for moving samples of the material through the probe. Various resilient and abrasion resistant materials seal the probe to the housing, and a plurality of rollers are mounted within the housing for stabilizing and guiding the moving probe. A gate is movably mounted on a pneumatic cylinder for closing the open front end of the probe when the probe is in the retracted position.