A lot of industrial sensors like pressure sensors, thermocouples,flow meters, distance sensors come with these analog outputs. There are products with will takes these 0-5V,0-10V,0-24V or 4-20mA signal and convert into digital values which can be interpreted by the electron and can be converted in real world values.
- 0-5V,0-10V You can try this board
16bit 0-10V ADC - 4-20mA you can use this one
4-20mA current receiver - 0-24V ADC
0-24V ADC
Thanks