Electronic Systems Design, Inc. announces development of the ESDI Model 258 Reverse Osmosis System Controller. It maintains water tank level, has an input for pre-treatment lockout and a low-pressure input for pump shutdown. Inlet and flush relays have isolated contacts, rated at 240 VAC, three amps max. The pump output relay and double-pole power switch are both rated at one hp/120 VAC and two hp/240 VAC. The controller incorporates several selectable flush cycles to help increase membrane life, can operate from either 115 VAC or 230 VAC, 50/60 Hz, and the unit enclosure is NEMA 4X indoor rated. These products are designed to comply with UL-508, IEC Standard 1000-4-4, Part 4 for electromagnetic interference and come with a two-year warranty.www.esdi.net(818) 365-0864
