And if you are going to use the full range of this sensor (or even just half the range), I'd suggest calibrating it with a wider range of loads than 1.4A to 2.3A
These two loads of 500W and 300W are test loads. The sensor is considered to be linear. Therefore, the equation derived based on 500 and 300W will always give correct reading for any load 0A - 20A. If the test loads are changed to 2200W (10A) and 4000W (20A), one will arrive at the slightly better response equation; but, there are difficulties to manage such kinds of large test loads in the personal Lab; it is also not recommended from safety point of view.
@ tsakitsan
Please report your equation and its responses with real two loads. I will compare your equation with mine one. What is your domestic voltage -- 220V or 110V? Mine one is 220V (nominal).