A differential pressure sensor for air flow is a device that measures the difference in pressure between two points in a system. This type of sensor is used to measure the flow rate of air in a variety of applications, such as HVAC systems, air compressors, and air handling units. The differential pressure sensor works by measuring the difference in pressure between two points in the system. This difference in pressure is then used to calculate the flow rate of air. The sensor is typically mounted in the ductwork of the system, and is connected to two pressure ports. The differential pressure sensor is an important tool for monitoring air flow in a variety of systems, as it allows for accurate and reliable measurements of air flow. It is also an important tool for diagnosing and troubleshooting air flow issues, as it can provide valuable insight into the performance of the system.