Measuring small air pressure gradients by a flow sensor.

In the branches of engineering that deal with relatively large volumes of gases, it is often desirable to monitor small variations in pressure that may develop within such volumes. For example, it is important to balance the airflow in a HVAC system, detect the degree of clogging of an air filter, and monitor human movement in an enclosed space for security and "smart home" applications. [ABSTRACT FROM PUBLISHER]