What is the difference between range and span in instrumentation?

Range refers to the lower and upper limits of measurement (e.g., 0-100 psi), while span is the algebraic difference between upper and lower range values (span = 100 psi in this case). For elevated zero (50-150 psi), range is 50-150 psi and span is 100 psi. For suppressed zero (-20 to 80 degrees C), range is -20 to 80 degrees C and span is 100 degrees C. Understanding these terms is essential for calibration and instrument selection.