Proteus is a powerful simulation software, but its default component library includes generic parts (resistors, capacitors, microcontrollers, LEDs). It does include application-specific sensors like the YF-S201 out-of-the-box.
The YF-S201 is a popular, low-cost sensor used to measure the volume and rate of liquids passing through a pipe. It consists of a plastic valve body, a water rotor, and a Hall-effect magnetic sensor. How it Works yf-s201 proteus library
Here is a simple yet functional sketch. It uses external interrupt 0 (on pin 2) to count pulses. Proteus is a powerful simulation software, but its