Guardian™ 1000 Digital Airflow Monitor senses and alerts the operator to low airflow conditions. Each monitor includes a face plate with circuit board, electrical power pack, airflow hose and flow hose adapter. LCD displays actual airflow in fpm or m/sec from 0 to 999 fpm (0 to 5.0 m/s). Audible/visual alarm alerts the user to sustained low velocity condition. Calibration instructions displayed on LCD. LED lights diplay red for alarm, yellow for caution, green for normal. Each monitor also includes a temperature-compensated sensor, external alarm, RS-232 port, night setback and alarm mute functions.