what is the difference between transmitter and converter ?

 what is the difference between transmitter and converter ?

Answer: Transmitter includes transducer(like strain gauge, capacitance sensor, etc) which converts one form of energy into a readable signal which might be 4-20mA, then transmitter itself will transmit that signal to controller, on the over hand, converter converts one form of signal into another form, for example 3-15psi into 4-20mA.