This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. They're often used to detect when a door or drawer is open, which is why they have mounting tabs and screws.
This differential pressure transmitter is specially designed for HVAC and fresh air systems, providing accurate and stable air pressure measurement for ducts, filters and ventilation equipment to ensure efficient airflow monitoring and system control. As a reliable HVAC pressure sensor, it supports low pressure differential measurement and is widely used in building automation and ventilation applications.