It explains the zero point error, span error, and non-linearity, which are the most important factors related to the accuracy of pressure sensors.
What does the accuracy of a pressure sensor mean, and how does the inaccuracy that leads to errors in the desired measurement results arise? This video explains the most important factors related to the accuracy of pressure sensors: zero point error, span error, and non-linearity. Non-linearity refers to the maximum error in the characteristic curve of the ideal straight line. There are various methods to determine the ideal straight line. The two most common are the terminal method and the best fit straight line (often referred to as BFSL in data sheets). When comparing the two methods, the terminal method typically yields deviations that are twice those of the best fit straight line. Therefore, even when comparing the non-linearity of electronic pressure gauges from different manufacturers, compatibility exists only when non-linearity is measured using the same method. The interaction of zero point error, span error, non-linearity, and other errors such as hysteresis and reproducibility is referred to as "accuracy." The term "accuracy" exists only in the user's documentation and is not clearly defined in any standard.
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Many sensor data sheets contain this term, but there is no common understanding of what "accuracy" means. In reality, there is various data related to "precision" rather than "accuracy." All of these together represent the "precision" of the instrument. The factors related to the precision of pressure sensors are standardized. Since how to specify precision in data sheets is a matter for each manufacturer, it is not possible to compare solely based on manufacturer information. For example, measurement errors include systematic and random elements, so the numerical value of precision is determined statistically. It is necessary to distinguish between measurement errors displayed as "maximum" and "standard," and in the case of maximum error, it is expected that there are no instruments with errors greater than the specified error. Most of the products actually delivered should have errors significantly smaller than the maximum error. If there is a description of "typ.," it is expected that not all instruments conform to this precision data, and "Typ." means typical. In extreme cases, the measurement error of individual instruments can be several times the specified "standard" error.
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It has a proven track record of use primarily in general industrial applications across various industries such as petrochemicals, semiconductors, automotive, pharmaceuticals, food, and machinery equipment.
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"WIKA" is a global manufacturer of measurement instruments headquartered in Germany. For over 70 years, it has maintained a top-class market share in measurement instruments as a specialized manufacturer in the global market. It is the number one manufacturer in Europe for measurement instruments, including pressure gauges and thermometers, widely used in the manufacturing industry, such as plant equipment, and is among the top manufacturers in the world. Currently, it operates in over 40 countries worldwide and boasts a total workforce of 9,000 employees, making it a global company. The Japanese branch has seen a steady increase in performance and has a track record of transactions with major companies across a wide range of industries, including large heavy industry manufacturers. The brand power and product strength are so high that it is often said, "Measurement instruments are WIKA." With bases in over 40 countries, as Japanese companies become more active in expanding overseas, the demand has also increased, and the company's strength lies in its ability to handle everything, including follow-up after product installation. Because it offers a wide range of products not found in other competitors, it can provide comprehensive solutions to meet customer needs.