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the following quote from: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/airflow-sensors/amplified/awm700/documents/sps-siot-awm700-series-airflow-sensors-install-pk80150-2-en-ciid-50056.pdf"Installation Instructions for the AWM700 Series Airflow SensorsISSUE 2PK 80150Sensing and ControlGENERAL INFORMATIONAWM700 Series airflow sensors operate on the theory of heattransfer due to mass gas flow across the surface of thesensing element. The sensing element consists of a resistorbridge heater circuit and dual temperature-sensing resistorbridges. This configuration senses mass flow rates and flowdirection. "says what it is.