Converting data into ppt using Water/Salinity level Sensor module

Other Hardware Sensors
1

Here is the code

void setup(){

Serial.begin(9600);

}

void loop(){

Serial.print("Water level Sensor Value:");
Serial.println(analogRead(A5));
delay(100);

}

I've got a problem and i have no idea on how to convert the datas shown on the serial monitor of the arduino into ppt.
Application: Monitoring the salinity level of the water.

Thank You and Godbless :slight_smile:

attached here with the photo of of the sensor

sensorrr.jpg