0-20mA or 4-20 mA loops are super common in industrial automation for analog sensors (pressure, temperature, etc) as they're very resistant to electrical noise

0-20mA or 4-20 mA loops are super common in industrial automation for analog sensors (pressure, temperature, etc) as they're very resistant to electrical noise unlike those using voltage. The nice part is they can be easily converted back to voltage at the point of terminus using a resistor.