The idea behind many industrial switches is simple; they are a form of industrial automation that operates in response to a change in conditions. For pressure switches, pressure drives the change, but you can activate other similar switches through anything from voltage levels to temperatures. What matters most is that the switch operates on its own when certain conditions create a need for this.Springs and Membranes
The key to a pressure switches is the interaction between springs and membranes. The way it works is that the switch has a membrane with a spring on one side and pressure volume on the other. Once the pressure reaches a preset level it overcomes the spring, allowing the switch to close. Pressure switches are available for a number of different purposes but they all rely on the same basic principle.Air Compressor Pressure Switches
Anyone who has used an air compressor has breathed a sigh of relief when the pump shuts off. Air compressor pressure switches are what let you walk away from the compressor secure in the knowledge that it will shut off by itself when the tank is full. It's both a convenience and a safety feature. An air compressor with a pump that won't shut off is just another word for a bomb.Other Pressure Switches
Air compressors aren't the only uses for pressure switches. Pump pressure switches work with your water pump, keeping the tank full for your daily usage. Cars have pressure switches too; after all, how would the sensor for your oil or water pressure gauge work without a pressure switch? It wouldn't.Changing Pressure Switches
No matter what kind of pressure switch you use, the chances are very likely that you may need to change one at one time or another. In all cases, you need to be sure to disconnect the power and release the pressure before working on the switch.