How often to calibrate a Pressure Switch /Level Switch /Temperature Switch /Flow Switch?

Calibration Interval for switches

-Annual calibration is very typical for switches -If high accuracy and critical process,semi-annual or quarterly

Factors to consider for deciding calibration period

-Manufactures recommendation -Influence of environment -Criticality -Tolerance -History,Consistency with similar device

Refer - NCSL RP 1 standard for more information about calibration interval.