Calibration MITIGATING HYSTERESIS


While hysteresis cannot be completely eliminated, it can be managed and minimised. Here are some best practices to help you do this:


Regular calibration: Calibrate regularly, with up and down cycles, to identify hysteresis.


Instrument selection: Choose high-quality pressure instruments with low hysteresis characteristics for critical applications.


Consistent procedures: Follow consistent calibration procedures to ensure the repeatability and reliability of results.


Instrument cleanliness: Ensure that instruments are clean and free from contaminants that could affect their performance.


Environmental control: Whenever possible, maintain stable environmental conditions during calibration to reduce external influences. Of course, this is not always possible when calibrating instruments in field conditions.


HYSTERESIS IN PRESSURE SWITCHES With any switches, including pressure switches, there is a hysteresis-like feature called “deadband”. This means that the switch has been designed so that there is some difference between the opening and closing points with increasing and decreasing pressure. This may seem a lot like hysteresis, or even be called hysteresis, but it is not actual hysteresis. This deadband is needed and important in switches, otherwise the switch could start oscillating between open and closed when the pressure is at a certain value. Because switches are used to control specific operations, this is undesirable. Anyhow, you can learn more on pressure switches in this blog post: Pressure Switch Calibration.


CONCLUSION


Hysteresis is a critical factor to consider in pressure calibration, especially in the world of process instruments, where precision is paramount. By understanding what hysteresis is, identifying its causes, and implementing best practices to manage it, you can ensure more accurate and reliable pressure measurements.


Beamex www.beamex.com


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Instrumentation Monthly September 2024 31


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