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Whats the difference between IEC 60770 and BFSL accuracy?

Difference between IEC 60770 and BFSL Accuracy #

Accuracy in pressure measurement is crucial for various applications. This knowledge hub page aims to clarify the disparities between IEC 60770 and BFSL accuracy standards, which are crucial in comprehending pressure sensor performance. When discussing accuracy, IEC 60770 delineates it as the amalgamation of zero and span offset errors, commonly termed terminal errors. However, in practical scenarios, accuracy is often synonymous with NL&H as a BFSL (Best Fit Straight Line), with the latter being paramount in most cases. This emphasis stems from customers nullifying offsets such as ‘Zero’, ‘Tare’, or ‘Null’, thereby accentuating linearity and hysteresis as the predominant errors to consider. By understanding these distinctions, users can make informed decisions when selecting sensors and transmitters tailored to their specific pressure measurement needs. Understanding the differences between standards like IEC 60770 and terms like BFSL (Best Fit Straight Line) accuracy is essential for selecting appropriate sensors and transmitters.

IEC 60770 #

IEC 60770 is a widely recognized standard for pressure sensor performance. It defines various parameters affecting accuracy:

  • Linearity: The ability of a sensor’s output to follow a straight line when plotted against input pressure.
  • Hysteresis: The maximum difference in output readings for the same pressure when approached from increasing and decreasing pressure directions.
  • NL&H (Non-Linearity and Hysteresis) Combines linearity and hysteresis to quantify the overall deviation from ideal performance.
  • Terminal Errors: Errors occurring at the extreme ends of the sensor’s measurement range.

BFSL Accuracy #

BFSL, or Best Fit Straight Line, measures the maximum deviation of the sensor’s output curve from a straight line drawn through the sensor’s zero and full-scale outputs.

While both IEC 60770 and BFSL accuracy provide insights into a sensor’s performance, they differ in terms of:

  • Their calculation methods.
  • The specific performance parameters they focus on.
  • Their suitability for different applications and industries.

In summary, understanding the nuances of these accuracy measures is essential for selecting the most appropriate pressure sensors and transmitters for specific applications.