The new Bell & Gossett Technological 502 variable-speed pump controller uses newly developed technology to be more efficient and save more energy in hvacr and pressure-booster applications. Some of the features include: Plain English diagnostic display with soft-touch keypad switches; four analog inputs for a combination of zone sensors, flow sensors, and suction sensors; and program safeguards against damaging hydraulic conditions, such as pump-flow surges, hunting, and system over-pressurizations. www.bellgossett.com