This company offers the USDT 2001, a universal differential controller. A microprocessor-based temperature controller, it regulates, monitors and displays supply and return temperatures in heating systems. A green LED comes on when the supply temperature exceeds the return temperature by a programmable temperature difference.
Thermo Technologies, 5560 Sterrett Place, Suite 115, Columbia, MD 21044; (410) 997-0778; fax (410) 997-0779.
