Cabin pressure control systems are designed for safety and passenger comfort. Pressurized cabins enable pilots, crew and passengers to avoid unpleasant or even deadly illnesses when flying at high altitude (altitude sickness, ear barotraumas, decompression sickness, hypoxia, …). While the air outside the cabin thins out the higher a plane climbs, compressed air inside the cabin maintains more surface-level air pressure and oxygen-rich air.
A cabin pressure control system is usually an electro-pneumatic system normally operated by a digital-electronic controller. Valves control the cabin pressure, regulating the discharge of the air from the cabin to the outside. Door sealing is also usually controlled by a pressure regulated air supply and pressure switches.
The cabin switch senses the difference between the cabin and the ambient pressure. In order to sense the differential pressure two ports are provided, one open in the cabin and the other connected to the airplane static source.
MEMSCAP has developed high stability and high accuracy pressure switches specifically for this application. Our product baseline relies on MEMSCAP SP82 sensor technology and our transducers calibration methods.