BETA-2 Digital Day/Night Fan Speed Controller

TrolMaster’s BETA-2 is a standalone digital day/night fan speed controller designed for variable-speed 120 V inline or exhaust fans. A remote air-temperature probe (16 ft cable) informs the controller to increase or decrease fan speed to manage heat, with adjustable output from 25–100%. Separate day and night setpoints are handled automatically by a built-in photocell. The unit uses a TRIAC output and includes a 6 A / 250 V fuse. A simple LED display and push-button interface allow setting temperature, fan speeds, cutoff temperature, and °F/°C. Stated accuracy is ±1 °F, and typical operating environment is 32–122 °F ambient, with control range 41–95 °F. Supplied with AC power cord (1.8 m) and temperature sensor for efficient ventilation control in enclosed grow spaces.