The Helios EDR is an electronic controller designed to monitor differential pressure with a built-in pressure sensor and fittings for DN5 mm pressure hoses (to be provided on site). It features adjustable pressure ranges of 0 – 1000 Pa, 0 – 500 Pa, 0 – 300 Pa, and 0 – 200 Pa, enabling precise, stepless control of single-phase and three-phase EC fans or frequency converters using a 0 – 10 V DC setpoint input. The controller can be powered directly from an EC fan or frequency converter providing 10 – 24 V DC at 6 mA (safety extra-low voltage), or alternatively through an external power supply unit (NG 24, sold separately).