Expert’s answer :How does pneumatic communication work?
I’m sure those who regularly worked with pneumatic devices don’t miss them at all. I never used them in my career, but my technical school had them for our training.
These devices need air pressure to make them work. They generate a standard output from 3 to 15 pounds per square inch. Once upon a time, everything worked on this standard, much like analog’s 4-20 mA. Plus, using three as the zero percent would tell you if the device had a leak or other problem, showing the pressure as less than three.
Thanks to advances in electronics, we no longer rely on this method, although you’ll hear of control loops with pneumatics still in their processes. And a quick online search will show you companies still selling pneumatic transmitters. Usually, you’ll find them as control valve positioners, boosters, and things like that.
If you want to learn more about pneumatic systems, you can read our article on flapper nozzle systems. That will give you the basics of pneumatic devices, because all of them use this working principle.
And these articles will tell you more about the devices too:
Valve positioners translate signals from the control system to send the right pressure to an actuator. For the rest, click here.
Q&A: “Where do you apply volume boosters?”. Reading the answer, click here.
Every thing you need to know inside in the article. For the rest, click here.