Chapter 03A - Instr Characteristic

Chapter 03A - Instr Characteristic - CHAPTER III...

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CHAPTER III INSTRUMENTATION CHARACTERISTICS
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INSTRUMENTATION CHARACTERISTICS ± Shows the performance of instruments to be used. ivided into two categories: static and ± Divided into two categories: static and dynamic characteristics. ± Static characteristics refer to the comparison between steady output and ideal output when the input is constant. a ic cha acte istics efe to the ± Dynamic characteristics refer to the comparison between instrument output and ideal output when the input changes. Dr. Abdirahman CHAPTER 3 Page 2of 30
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STATIC CHARACTERISTICS 1. ACCURACY ± Accuracy is the ability of an instrument to show the exact reading. ± Always related to the extent of the wrong reading/non accuracy. ± Normally shown in percentage of error which of the full scale reading percentage. Dr. Abdirahman CHAPTER 3 Page 3of 30
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xample : STATIC CHARACTERISTICS Example : A pressure gauge with a range between 0-1 ar with an accuracy of % fs (full- cale) bar with an accuracy of ± 5% fs (full scale) has a maximum error of: 5 x 1 bar = ± 0.05 bar 100 Notes: It is essential to choose an equipment which has a suitable operating range. Dr. Abdirahman CHAPTER 3 Page 4of 30
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STATIC CHARACTERISTICS Example : A pressure gauge with a range between 0 -10 bar is found to have an error of ± 0.15 bar when calibrated by the manufacturer. l lt Calculate : a. The error percentage of the gauge. b. The error percentage when the reading obtained is 2.0 bar. Dr. Abdirahman CHAPTER 3 Page 5of 30
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STATIC CHARACTERISTICS Answer : a. Error Percentage = ± 0.15 bar x 100 = ± 1.5% 10.0 bar b. Error Percentage = ± 0.15 bar x 100 = ± 7.5 % 0±bar 2.0 bar he gauge is not suitable for use for low ±
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Chapter 03A - Instr Characteristic - CHAPTER III...

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