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Category > Management Posted 04 May 2018 My Price 6.00

angle of inclination

Show that the instrument (systematic) uncertainty in an inclined tube manometer in Example 9.3 increases to 6.8 N/m2 as u goes to 90 degrees.

Example 9.3

An inclined manometer with the inclined tube set at 30 degrees is to be used at 20°C to measure an air pressure of nominal magnitude of 100 N/m2 relative to ambient. Manometer ‘‘unity’’ oil (S = 1) is to be used. The specific weight of the oil is 9770  0.5% N/m2 (95%) at 20°C, the angle of inclination can be set to within 1 degree using a bubble level, and the manometer resolution is 1 mm with a manometer zero error equal to its interpolation error. Estimate the uncertainty in indicated differential pressure at the design stage.

ASSUMPTIONS Temperature and capillary effects in the manometer and gravity error in the specific weights of the fluids are negligible. The degrees of freedom in the stated uncertainties are large.

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Maurice Tutor
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Status NEW Posted 04 May 2018 07:05 PM My Price 6.00

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