Pressure Sensor Hysteresis Error
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Hysteresis Error Definition
Pressure Sensors Torque Transducers & Torque Sensors Sensors for Motorsport Digiforce Services About Us Blog Resources hysteresis error example Free Engineering Unit Conversion Program Glossary of Transducer-Related Terms Instrument Calibration & Test Procedure Videos ATEX, Intrinsic Safety & Hazardous Area Information IP Ratings and Equivalent NEMA hysteresis pressure transducer Ratings Reference Articles on Sensors and Transducers Engineering Notes on Pressure Measurement Links to Other Useful Websites Distributors Contact Us Quick Enquiry Form Name: Email Address or Phone No: Your Enquiry: >>You Are Here: Home > Technical Resources > Technical Notes on Pressure Sensing What are hysteresis errors? The hysteresis error of a
Hysteresis Error In Transducer
pressure sensor is the maximum difference in output at any measurement value within the sensor's specified range when approaching the point first with increasing and then with decreasing pressure. The hysteresis error value is normally specified as a positive or negative percentage of the specified pressure range. If a sensor is only used over half of the specified range the hysteresis error is calculated from this value. By using the maximum working pressure, the accuracy is of course better than specified by the manufacturer (for example percentage of working pressure). Also, the hysteresis error is usually expressed as a combination of mechanical and temperature hysteresis. Mechanical hysteresis Mechanical hysteresis is the output deviation at a certain input pressure, when that input is approached first by increasing and then by decreasing pressure. Temperature hysteresis Temperature hysteresis is the output deviation at a certain input pressure, before and after a temperature cycle. The hysteresis error is not always specifie
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Linearity Error
Manufacturing Excellence History Of Dwyer Innovation Careers Hours of Business Email Us Website Feedback | Catalog Digital Catalog Catalog Request | Videos SlideShare YouTube LinkedIn Twitter Facebook http://www.appmeas.co.uk/technical-notes/what-are-hysteresis-errors.html Understanding Pressure Sensor Accuracy What is accuracy? The International Electrotechnical Commission's (IEC) definition of accuracy is the maximum positive and negative deviation from the specified characteristic curve observed in testing a device under specified conditions and by a specified procedure. Unfortunately when it comes to defining accuracy for a pressure sensor it's more complicated. Accuracy has https://www.dwyer-inst.com/articles/industry/powderbulk/understanding-pressure-sensor-accuracy/understanding-pressure-sensor-accuracy.cfm a large effect on the cost of a pressure sensor or even more important, the quality or efficiency of the process it is measuring. It is important to understand what factors determine accuracy and what questions to ask when selecting a sensor. Even though there isn't a defined standard for pressure sensor accuracy there is an IEC standard that defines factors that make-up accuracy. IEC 61298-2 states that accuracy must include Hysteresis, Non-Repeatability and Non-Linearity. Non-Repeatability and Hysteresis are well defined. Hysteresis is the maximum difference in sensor output at a pressure when that pressure is first approached with pressure increasing and then approached with pressure decreasing during a full span pressure cycle. Non-Repeatability is the maximum difference in output when the same pressure is applied, consecutively, under the same conditions and approaching from the same direction. Where manufactures start to differentiate is with Non-Linearity. IEC 61298-2 lists three methods of Non-Linearity, the two most popular methods used by sensor manufactures are the Best Fi
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