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Chapter 03A - Instr Characteristic

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

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CHAPTER III INSTRUMENTATION CHARACTERISTICS
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INSTRUMENTATION CHARACTERISTICS Sh h f f i Shows the performance of instruments to be used. 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. D 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 2 of 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 3 of 30
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Example : STATIC CHARACTERISTICS A pressure gauge with a range between 0-1 bar with an accuracy of ± 5% fs (full-scale) 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 4 of 30
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STATIC CHARACTERISTICS Example : A pressure gauge with a range between 0 b i f d h f - 10 bar is found to have an error of ± 0.15 bar when calibrated by the manufacturer. C l l t 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 5 of 30
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STATIC CHARACTERISTICS Answer : a. Error Percentage = ± 0.15 bar x 100 = ± 1.5% 10 0 b 10.0 bar b. Error Percentage = ± 0.15 bar x 100 = ± 7.5 % 2 0 bar 2.0 bar The gauge is not suitable for use for low range reading.
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