Sensors are like sensing cells on the skin of human fingers, and transmitters are like nerves. Sensing cells can sense pressure, but the output signal is sent to the brain, which doesn't understand it. It is impossible to put a finger on the brain. So the induced signal changes its signal format through the nerve, such as amplification, and then it is transmitted to the brain at high speed, and the brain will understand what is going on.
The pressure sensor only senses the pressure through things like piezoresistors, and the output signal is very weak. After the transmitter amplifies the signal, for example, standard 0. -10V, which can be directly used in controllers such as PLC. Now some sensors and transmitters are integrated.
Jiangsu Feiyun Instruments will answer your questions.