Raw signals from sensors are often weak or non-linear.
Smart instruments contain internal microprocessors. They do not merely send a raw process variable; they also perform self-diagnostics, compensate for environmental temperature drifts, and transmit calibration data directly to the central control room. Fieldbus Protocols Instrumentacion Y Control Industrial Bolton 11.pdf
The book typically covers topics such as: Raw signals from sensors are often weak or non-linear
If you're looking for specific information or solutions related to "Instrumentacion Y Control Industrial Bolton 11.pdf", I recommend checking: they also perform self-diagnostics
: The smallest detectable change in the measured quantity.