P233A-10-AKC | Differential Pressure Switch, 1.4 Mbar to 10 Mbar Range, < 0.5 Mbar Differential, SPDT Contacts, includes FTG015N602R (2x) + 2 m tube 4/7 mm | Johnson Controls

This switch senses a change in the (differential) pressure as the airflow changes. The (differential) pressure is applied to the two sides of a diaphragm in the control. The spring-loaded diaphragm moves and actuates the switch. The series P233A/F can also be used to detect small positive gauge pressure or to detect a vacuum.