Pneumatic logic controllers, also referred to as air logic controllers, are pneumatic systems used in the control of industrial processes to execute specific actions. These actions can be performed by AND units, OR units, booster units and timers.Pneumatic logic controllers perform similar functions to relays, pneumatic timers switches and counters, but utilise compressed air as the controlling mediums instead of electrical currents. They resemble mini 3-way and 4-way air valves, and perform specific actions such as on, off or pause in pneumatic actuators.At RS Components, our range of pneumatic air controllers includes products from leading brands, such as Crouzet, Festo, Norgren, Parker and SMC, with a variety of connection types and logic types available.What are pneumatic logic controllers used for?Pneumatic logic controllers are useful in environments exposed to dust or moisture, because they operate using compressed air and not electrical currents. A pneumatic system will not fail or be damaged by contact with moisture. Using pneumatic logic controllers rather than controllers that require electricity also reduces the risk of fire or explosions when dealing with highly combustive materials as the control media, compressed air, cannot ignite.Types of pneumatic logic controllersPneumatic logic controllers are categorised by the type of connection they use; pin connections, bus connections, sockets or plugs. When choosing a pneumatic logic controller, there are several factors to consider to ensure the chosen product is suitable; specifically, the operating temperature and pressure ranges of your application should be taken into consideration when purchasing a pneumatic logic controller.