Instrument Calibration

Instrument Maintenance and Calibration System

S Bharadwaj ReddySeptember 16, 2019October 5, 2019

A comprehensive maintenance program is critical to attaining long-term reliable performance of instrumentation systems and field Instrument with calibration systems. Periodic device calibration, preventive maintenance, and testing allow potential problems...

PLC Analog Input Card Resolution Effects on Accuracy

S Bharadwaj ReddyDecember 16, 2018March 21, 2019

An instruments accuracy is limited by its precision. An instruments precision is determined by making minute variations in the measured process variable (e.g., pressure, temperature) and then monitoring the instruments...

Calibration and Preventative Maintenance Procedures

S Bharadwaj ReddyJanuary 11, 2018October 4, 2019

Calibration and Preventative Maintenance Calibration: A comparison of two instruments or measuring devices one of which is a standard of known accuracy (traceable to national standards) to detect, correlate, report...

Calibration : Up-tests and Down-tests

S Bharadwaj ReddyNovember 7, 2017July 22, 2019

Calibration : Up-tests and Down-tests Instruments are calibrated to measure the process variables in a fixed range of scale. All instruments are assumed to be Linear if the physical quantity...

Instrument Calibration Multiple Choice Questions

S Bharadwaj ReddyNovember 1, 2017July 14, 2019

Instrument Calibration Multiple Choice Questions Question 1 Identify the type of instrument calibration error(s) shown in this graph: (A) Hysteresis error (B) Linearity error (C) Both zero and span errors...

Difference between Calibration and Ranging

S Bharadwaj ReddyMarch 5, 2017March 5, 2019

The concepts of calibration (trimming) and ranging are often difficult for new engineers of instrumentation to immediately grasp. A simple analogy useful for understanding these topics is that of setting...

Important Terms in Calibration

S Bharadwaj ReddyAugust 29, 2016October 10, 2018

The term “calibration” in the context of smart/intelligent transmitters is often misunderstood. The information provided here serves to explain the difference between sensor trim, range setting, and current trim. Plants...

Instrument Zero and Span Calibration

S Bharadwaj ReddyAugust 16, 2016May 2, 2018

Every instrument has at least one input and one output. For a pressure sensor, the input would be some fluid pressure and the output would (most likely) be an electronic...

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