Electronic Systems Design, Inc. announces its Model 250C RO system controller for water purification systems. The controller maintains water tank level, has a lockout input for pre-treatment regeneration, low pressure shutdown, etc. and controls inlet and flush valves rated at 24 VAC, 5W. Pump output is an isolated power relay rated at 240 VAC, two HP (20 Amp). The controller also incorporates several flush cycles to help increase membrane life. Primary power is 120/240 VAC, 50/60 Hz; the NEMA 4 enclosure is six by six by four inches (152.4 x 152.4 x 101.6 mm). Made in the USA and designed to comply with UL-508 and IEC Standard 1000-4-4 Part 4 for electromagnetic interference.www.esdi.netmastern@esdi.net