No difference only magnitude
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second onetransmits,first onereceives.
They are the same thing. A smart transmitter can be Hart, Fieldbus and in the case of Foxboro instruments FoxCom.
hydraulic is liquid based, pneumatic is air.
the frequency difference between the transmitter and the receiver without any noise or distortion
Pneumatic elevators work on air pressure (similar to a bank's drive through suction tubes) and hydraulic elevators work on oil/water pressure.