What is intuition, after all?
Intuition is a simple thing which is very difficult to explain, specially to sensors, but I'll try to do my best. See the next photo:
There are two glasses on it, one is inside the big bottle. Why is it harder to spot? Well, as the big bottle is filled with water, the glass inside of it blends with the surroundings more than the glass on the right. We can observe the big bottle just as well as we can see the glass over the table, but the uniformity inside of it makes it more difficult to distinguish what's actually inside.
The universe is just a big, uniform place and it's impossible to tell where one object ends and the next one starts because, in fact, the whole concept of having separate objects is artificial. In order to understand the universe as a separate set of objects we need to introduce the concept of contrast. We don't really observe objects, we observe the boundaries between them. Through evolution we developed a set of arbitrary contrasting scales to allow us to perceive those abstract objects and that's what we call our senses. Smell, flavor, tone, color... those are nothing but inventions of our mind, an internal and abstract representation of the external world.
Natural senses are limited to the perception of their specialized field. Vision, for example, requires light and is useless in its absence. Just imagine what happens with those things in the universe that none of our senses can perceive, like radio waves. They exist, despite that we can sense them or not. If we use a radio to turn such signals into sound, we are still not perceiving radio signals, just making such information friendly to our senses. We can only be aware of the existence of such things by our most powerful sense, intuition, which is the natural evolution of all others.
Why is intuition more powerful than our other senses? Well, it's because intuition creates contrast for us from any source. It can be from external perceptions through our other senses to abstract ideas and concepts. A good example is to realize that, to our natural senses, the world is flat. Only through intuition we can realize how the world really is, because intuition can take an idea and make an internal representation of such concept. It is extremely important to understand that everything in our mind is just a representation of what is outside, so there is no difference between what we perceive and what we imagine.
Intuition also allows a person to exercise the most important property of humans: the sense of time. Since we can create our internal representations without having to wait for real stimulus from perception, we can simulate situations in the future or re-create those of the past.
So don't be fooled by socionics. There are no sensors and intuitives, only "low intuitives" and "high intuitives".