oldmouldy thank you for your very quick response, but it's seems this circuit doesn't work for what I'm looking for, which is a adjustable current source (from 4mA to 20mA).
This adjustable current source is to replace the current source on the circuit attached.
The goal of the circuit is to simulate a sensor which output range is from 4mA to 20mA, and convert that output current to an interval from 0V to 5V.
This is working fine with a current source but I can't use one, so I need to replace it with a similar circuit, that's why I was trying to use a LM7085 but I came to the conclusion it won't work as it is supposed to, with such low values of current.
Any suggestions of an equivalent circuit I can use to replace the current source?