What are the advantages of using pneumatic controls?
What will be an ideal response?
They are simple to install and understand. A person with a mechanical background can soon adapt to them.
They are safe and explosion-proof where combustible materials may be used.
They are easily adapted to provide either on-off or modulating control functions.
They are very versatile, and many control sequences may be accomplished with them.
They are very reliable.
Installation cost may be lower than the cost of running long electrical lines and conduit.
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Fill in the blank(s) with the appropriate word(s).