Electronic Systems Design”s Model 250C reverse osmosis system controller is a low-cost, reliable device designed for manufacturers of industrial and commercial water purification systems. The controller maintains water tank level, has a lockout input for pre-treatment regeneration, low pressure shutdown, etc. It controls inlet and flush valves rated at 24VAC, 5W. The pump output is an isolated power relay rated at 240VAC, 2HP (20Amp). The controller also incorporates several flush cycles to help increase membrane life. The primary power is 120/240VAC, 50/60 Hz, and the NEMA 4 enclosure is 6” x 6” x 4”.