how many devices in the same loop can be installed for industrino420maker?
I guess you mean on the I2C link for instance. Well, in fact, as many as the 4-20 mA.ker can provide power to (have a look at the power consumption of each of your sensors and the available power on the 3.3V of your 4-20 mA.ker in the specs), if they have different adresses. Then you will have to figure out how you pass the information to your CPU through the 4-20 mA link. We have developped a way to send 7 values full-scale that way, if you are interrested.
Hope this helps,
Please try to give a substantial answer. If you wanted to comment on the question or answer, just use the commenting tool. Please remember that you can always revise your answers - no need to answer the same question twice. Also, please don't forget to vote - it really helps to select the best questions and answers!