What are Hysteresis Errors?

The hysteresis error of a pressure sensor is the maximum difference in output at any measurement value within the sensor’s specified range when approaching the point first with increasing and then with decreasing pressure.

Graph showing sensor hysteresis errors

The hysteresis error value is normally specified as a positive or negative percentage of the specified pressure range. If a sensor is only used over half of the specified range the hysteresis error is calculated from this value.

By using the maximum working pressure, the accuracy is of course better than specified by the manufacturer (for example percentage of working pressure). Also, the hysteresis error is usually expressed as a combination of mechanical and temperature hysteresis.

Mechanical hysteresis

Mechanical hysteresis is the output deviation at a certain input pressure, when that input
is approached first by increasing and then by decreasing pressure.

Temperature hysteresis

Temperature hysteresis is the output deviation at a certain input pressure, before and after a temperature cycle.

Hysteresis errors are not always specified separately but combined in a total figure for linearity, hysteresis and repeatability.

Read more: Index to all of our Technical Notes on Pressure

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