The FSW800B Series air-flow monitor provides a simple but reliable alternative to indicate positive or negative air flow of fans. When properly installed and connected in series with an optical (i.e. LED) or audible signaling device, a bi-directional switch will activate an electrical contact if the air flow of the fan falls below 8.2 ft/s, thus either turning the signaling device on or off.
SPECIFICATIONS Contact Type: Reed/magnet contact NC (Normally Closed): Contact open with air flow NO (Normally Open): Contact closed with air flow Switching Threshold of Air Flow Speed: >8.2 ft/s (2.5 m/s) Hysteresis: 3.3 ft/s (1 m/s)—fixed Contact Resistance Includes Wire: 370 mΩ Service Life: >100,000 cycles Max. Switching Capacity: 10 W (resistive load) Max. Switching Voltage: NC (AC/DC 240 V); NO (DC 60 V) Max. Switching Current: NC (DC 500 mA); NO (DC 170 mA) Connection: 2 x single strand AWG 26, length 500 mm (20'), tip of stranded wire stripped/tinned 5 mm (0.20') Mounting: Attachment clamp and/or clip, or integrated in protective grill Housing: Plastic, black Dimensions: 34 x 17.5 x 7.5 mm (1.3 x 0.7 x 0.3') Mounting Position: Air-flow monitor opening perpendicular to air flow Operating Temperature: -20 to 50°C (-4 to 122°F) Storage Temperature: -20 to 80°C (-4 to 176°F) Protection Type: NEMA 1 (IP 20)