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Uncertainty in Measurement: Accuracy and Precision

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.

Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. Highly accurate measurements...

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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests

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Published on: August 30, 2019

Pressure transmitter accuracy.

H M Hashemian¹, Jin Jiang

¹Analysis and Measurement Services Corporation, AMS Technology Center, 9111 Cross Park Drive, Knoxville, TN 37923, USA. hash@ams-corp.com

ISA Transactions

|June 2, 2009

Summary

This study details pressure transmitter calibration drift causes and methods. On-line calibration techniques are highlighted to maintain transmitter accuracy and prevent common issues like temperature fluctuations and sensing line problems.

Area of Science:

Instrumentation and Control Engineering
Metrology

Background:

Pressure transmitters are crucial for industrial process monitoring.
Calibration drift can significantly impact measurement accuracy and process reliability.

Purpose of the Study:

To identify key causes of calibration drift in pressure transmitters.
To outline essential calibration procedures for ensuring transmitter accuracy.
To introduce on-line calibration as a solution to maintain accuracy.

Main Methods:

Bench calibration using constant pressure sources (e.g., deadweight testers).
Analysis of factors causing drift post-installation: temperature, pressure, humidity, vibration, aging, and maintenance.
Investigation of sensing line issues: water boil-off, gas dissolution, voids, blockages, freezing, and leakage.

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Implementation of on-line calibration monitoring techniques.

Main Results:

Identified multiple environmental and operational factors causing pressure transmitter calibration drift.
Detailed standard calibration procedures including zero and span adjustments.
Demonstrated how sensing line anomalies degrade transmitter performance.
Highlighted the efficacy of on-line calibration in mitigating accuracy issues.

Conclusions:

Regular calibration and awareness of drift causes are vital for pressure transmitter accuracy.
Sensing line integrity is critical for reliable pressure measurement.
On-line calibration offers a proactive approach to maintaining transmitter performance in operational environments.