Pressure sensor accuracy | 3 common errors | WIKA
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What does accuracy actually mean
What does accuracy actually mean with pressure sensors and how do inaccuracies, as in deviations from the desired measuring result, come about? In the video we explain the most important factors relevant for accuracy for pressure sensors: the zero point error, the span error and the non-linearity. The latter describes the greatest possible deviation of the characteristic curve from a reference straight line. There are different methods to determine the reference straight line. The two most common are the terminal method and the best-fit straight line method (often called BFSL in data sheets). If one compares both methods with each other, the terminal method usually provides a deviation that is twice as large as the best-fit straight line method. A comparison of the non-linearity of electronic pressure measuring instruments from different manufacturers is, therefore, only representative provided the non-linearity is determined using the same method.
#PressureSensorAccuracy #PressureSensor #WIKAgroup
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬▬▬
00:00 - Intro
00:06 - What is the Accuracy of Pressure Sensors?
00:17 - When is an error in a pressure sensor indicated?
00:40 - What are the three most common sources of errors in pressure sensor accuracy?
00:46 - What is a zero-point error in pressure sensors?
01:04 - What is a span error in pressure sensors?
01:35 - What is a non-linerarity error in pressure sensors?
01:58 - How do the 3 errors affect the measuring process in the pressure sensor?
02:44 - Where can I find the accuracy-relevant information of WIKA pressure sensors?
The interplay of zero point error, span error, non-linearity and other errors − such as hysteresis and non-repeatability − is colloquially referred to as “accuracy”. The term “accuracy” only exists in the user's dictionary. It is not defined in any standard. Nevertheless, it can be found in many of the data sheets for sensors. Unfortunately, there is no common understanding of what accuracy means. There isn't actually “accuracy”, but rather a variety of data relevant to accuracy. All of them together describe the “accuracy” of an instrument. The factors relevant to the accuracy for pressure sensors are uniformly defined across standards. Nevertheless, the manufacturer's information cannot really be compared with each other, since which accuracy specifications and how they are specified in the data sheet is a matter for each manufacturer. An example of this: Accuracy figures are determined statistically, since measuring errors contain both a systematic and a random element. It is necessary to distinguish between the measuring errors specified as “maximum” and “typical”. For a maximum error, it is expected that no single instrument has a greater error than that specified. In fact, the majority of the delivered products should actually have a considerably smaller error. If an error is given with the description “typ.”, which stands for typical, it is to be expected that not every single instrument complies with this accuracy data. In the extreme case, this may mean that an individual instrument has a measuring error several times the specified “typical” error.
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📰 Read our trade article “Do You Know the Accuracy of your Pressure Sensor?”: https://bit.ly/3w0Me6n
🌐 On our website you will find a large selection of pressure sensors: http://bit.ly/2V0g2Lp
📖 In the WIKA blog you will find interesting articles on the theme of pressure sensors: http://bit.ly/2UVP7QJ
🛒 Order pressure sensors directly from our online shop: http://bit.ly/2tfZ7Ze
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Follow us on our social media channels:
📺 YouTube: wikagroup
✅ LinkedIn: LinkedIn: wikagroup
#PressureSensorAccuracy #PressureSensor #WIKAgroup
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬▬▬
00:00 - Intro
00:06 - What is the Accuracy of Pressure Sensors?
00:17 - When is an error in a pressure sensor indicated?
00:40 - What are the three most common sources of errors in pressure sensor accuracy?
00:46 - What is a zero-point error in pressure sensors?
01:04 - What is a span error in pressure sensors?
01:35 - What is a non-linerarity error in pressure sensors?
01:58 - How do the 3 errors affect the measuring process in the pressure sensor?
02:44 - Where can I find the accuracy-relevant information of WIKA pressure sensors?
The interplay of zero point error, span error, non-linearity and other errors − such as hysteresis and non-repeatability − is colloquially referred to as “accuracy”. The term “accuracy” only exists in the user's dictionary. It is not defined in any standard. Nevertheless, it can be found in many of the data sheets for sensors. Unfortunately, there is no common understanding of what accuracy means. There isn't actually “accuracy”, but rather a variety of data relevant to accuracy. All of them together describe the “accuracy” of an instrument. The factors relevant to the accuracy for pressure sensors are uniformly defined across standards. Nevertheless, the manufacturer's information cannot really be compared with each other, since which accuracy specifications and how they are specified in the data sheet is a matter for each manufacturer. An example of this: Accuracy figures are determined statistically, since measuring errors contain both a systematic and a random element. It is necessary to distinguish between the measuring errors specified as “maximum” and “typical”. For a maximum error, it is expected that no single instrument has a greater error than that specified. In fact, the majority of the delivered products should actually have a considerably smaller error. If an error is given with the description “typ.”, which stands for typical, it is to be expected that not every single instrument complies with this accuracy data. In the extreme case, this may mean that an individual instrument has a measuring error several times the specified “typical” error.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
📰 Read our trade article “Do You Know the Accuracy of your Pressure Sensor?”: https://bit.ly/3w0Me6n
🌐 On our website you will find a large selection of pressure sensors: http://bit.ly/2V0g2Lp
📖 In the WIKA blog you will find interesting articles on the theme of pressure sensors: http://bit.ly/2UVP7QJ
🛒 Order pressure sensors directly from our online shop: http://bit.ly/2tfZ7Ze
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Follow us on our social media channels:
📺 YouTube: wikagroup
✅ LinkedIn: LinkedIn: wikagroup
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