Valve positioner provides boost to effluent qualityProblem: An Illinois wastewater treatment plant needed to improve valve position on each of its three drainage doors, then send the information to an Emerson Process Delta V plant control system for monitoring. Because each door had different opening characteristics, plant personnel had to be able to modify the analog output signal for each unit. To complicate matters, the valve actuator housings were small and located in challenging environments.Solution: The plant purchased field-programmable Kinax 2W2 Angular Position Transmitters from Absolute Process Instruments. Each transmitter is 1.95 inches in diameter and 1.1 inches deep, small
