Hi as I am using the simple value as mentioned below to read the current loop sensor readings, What happens if zero is flowed, and the output should be 4mA? However; the receiver “reads” 3.90 mA will there be any problem in sensor should I buy new one ??? or should I able to tune it?? your suggestions would be helpful to me
Far away from what we are discussing here, and I think the first thing in such cases is the sensor’s datasheet. I wouldn’t worry that much though as it is most probably easy to calibrate/recalculate, but… As above…
Not Blynk related 
Try Googling your question.