I am not quite sure, whether I understood your last posts correctly.

In case of pressure sensor, there is a certain diaphragm or membran sitting inside, which undergoes a bending stress, when a certain pressure is applied. In a first order approximation membran's elongation follows Hook's law: Elongation is proportional to pressure force.
Hook's law means, that ALL energy, which was applied to an elastic system is stored in elastic energy (elongation) and NO energy was transformed into irreversible heat. But reality looks different, of course. There is allways a certain amount of applied energy transformed into irreversible heat. So, when pressure force, which caused bending stress is removed again, membran's elongation does not return to 'zero'.
This phenomenon is called 'elastic hysteresis'. Unfortunately, elastic hysteresis is not predictable at all, because it highly depends on 'history' of bending stress and many other factors.

Let's give some examples about linearity error and hysteresis error of some pressure sensors:

KP100A, KP101A from Philips:...Linearity <0.5%, Hysteresis <0.1%
KPZ20G, KPZ21G from Philips:...Linearity <0.5%, Hysteresis <0.2%
KPY10 from Siemens:..................Linearity <0,5%, Hysteresis <0.5%

Very good (and expensive!) pressure sensors often specify a combined linearity and hysteresis error of less than 0.1%.

Does anyone want to use a 'professional' 24bit-ADC converter?

Bye,
Kai