Look into a 1-Channel 4-20mA Current Loop Receiver 16-Bit ADS1115 I2C Mini Module for the Arduino. "This 1 channel 4-20mA current loop receiver comes with on board power boost circuit and this 16V power supply can be used to power up the sensor. This 4-20mA current loop receiver board has a 2 pin connector which makes sensor connection real easy. This 4-20mA current loop receiver can be used with arduino, raspberry pi, particle photon, electron, usb, RS485, RS232 and any micro controller which has a i2c port. Readings data from this 4-20mA current loop receiver is simple, it communicates with the master controller over i2c and to read the 4-20mA output all you will need to do is send i2c commands and read the sensor values. This board has ADS1115." The above from there web site. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!