Answer / er. anish raj

Level Switch performs only switching mechanism. ie. when its electronic circuitry senses the present level is the desired one then its relay coil will operate & the NO contact will turn into NC and vice versa.
Whereas the Level Transmitter will visualize the signal, perform signal conditioning ( amplification) and then transmit the current signal to the controller in the form of 4-20 mA.

Thanks. 

Answer / manan2347

Lavel switch is Digital input where it gives only two single either ON (1) or OFF (0).

where level transmitter gives analog output means value of the output will vary with respect to time.
generally its between 4 to 20mA.

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