{"product_id":"accusense-305-bb1-n-b3-airflow-switch","title":"Accusense 305-BB1-N-B3 Airflow Switch","description":"\u003cdiv\u003e\u003cp\u003eaccusense 305-BB1-N-B3 Airflow Switch (Cambridge AccuSense 305-BB1-N-B3) is a bi-directional, base-mount sensor in the AccuSense Series 300\/305 that continuously monitors airflow to detect directional losses or reversals and to trigger a fault signal when airflow becomes insufficient. The switch uses solid-state electronics with an open-collector NPN output that sinks current to the return VDC and requires a pull-up; it operates on a 5 V supply (305-series) and draws about 100–140 mA with a total power dissipation around 0.2–0.8 W. Environmental specs include an operating temperature range of 5–60 °C, non-condensing humidity from 10–95% RH, and a storage range of -10 to 80 °C; startup and fault-response characteristics are 3 seconds (above 15 °C) \/ 30 seconds (below 15 °C) for startup and 3 seconds \/ 30 seconds for fault signaling. Typical applications cover cleanrooms, semiconductor fabrication facilities, electronics enclosures, and HVAC ducts where reliable detection of airflow direction or loss is critical.\u003c\/p\u003e\u003c\/div\u003e","brand":"accusense","offers":[{"title":"New","offer_id":51656969093422,"sku":null,"price":290.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_a6ca3d68-696f-424f-a62e-118eeddcc42a.jpg?v=1769464775","url":"https:\/\/plgautomation.com\/products\/accusense-305-bb1-n-b3-airflow-switch","provider":"PLG Automation ","version":"1.0","type":"link"}