Ahmed Azab’s Post

Name: Accuracy of pressure sensors | Keep an eye on those 3 errors!
Uploaded: 2024-05-10T10:02:02.089Z
Duration: 3 min 17 s
Channel: Ahmed Azab

Ahmed Azab

Vice President Global Projects Business at WIKA Group

7mo

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 🔹 the non-linearity. 🌐 On our website you will find a large selection of pressure sensors: http://spkl.io/60404NvTO #WIKAgroup #WIKAsmartinsensing #PressureSensor #PressureMeasurement #MeasurementTechnology

Transcript

[Accuracy of pressure sensors] What is actually meant by accuracy with pressure sensors and how do inaccuracies, as in deviations from the desired measuring result, come about? In a pressure sensor, the error is indicated when the value of the output signal does not correspond to the value of the measured pressure. And because that's not so easy to see or explain, let's take an abstract example: A simple children's height chart in 10 steps, here represented by colored blocks. Based on this benchmark the three most important accuracy relevant factors for pressure sensors will now be explained The zero-point error describes the deviation of the start of the measuring range from its set value. It arises when the chart has been set too high... or too low. As a result, the whole scale shifts and all the measuring results will deviate from the actual value by exactly this value. The span error occurs between the zero point and the full-scale value. It arises when the distance between the individual divisions is constant, but constantly wrong. An example: The graduation marks were labelled with 10 cm on the rule. However, the separation actually corresponds to 11 cm. At the beginning of the scale, this error is of minor importance, but it adds up and from a certain size it is noticeably significant. The non-linearity describes how crooked or ��non-linear�� the measured characteristic curve is. On the chart, the intervals are then sometimes too short, sometimes too long, or just right. The deviations are therefore uneven or non-linear, which makes the measuring result sometimes too high and sometimes too low. And how do the three errors just described affect the measuring process in the pressure sensor? The sensor characteristic curve describes at how much pressure which output signal is issued. The zero-point error shifts the sensor characteristic curve in parallel. The span error affects the slope of the straight line. And non-linearity turns the line into a curve. In practice, of course, all three measuring errors described may occur simultaneously. For individual measuring points, this can strengthen the errors or they could cancel each other out. The interplay of these and other errors - such as hysteresis and non-repeatability - is colloquially referred to as accuracy. For each WIKA pressure sensor you will find a list of the individual accuracy-relevant information in the data sheet. Thus, you can easily choose the right pressure sensor, in accordance with the accuracy required for your measuring task. If you still have questions, we are happy to assist you in selecting the right measuring instrument for your accuracy requirement.

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