What is SPAN in Instrumentation?

What is SPAN in Instrumentation?

SPAN is one of the most important concepts in measurement and calibration. It represents the difference between the maximum value and minimum value of an instrument’s measuring range.

Formula:

Span = Maximum Value − Minimum Value

For example, if a temperature transmitter range is 0°C to 100°C, then:

Span = 100 − 0 = 100°C

Understanding span helps engineers:

Select the right instrument

Perform accurate calibration

Configure proper scaling in PLC/DCS systems

Improve measurement reliability and process performance

Whether you’re a student, technician, or instrumentation engineer, mastering basic concepts like Span is essential for building a strong foundation in industrial automation.

What will be the Span of a pressure transmitter calibrated from 0 to 10 bar? Answer in the comments!