THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
9th Edition
ISBN: 9781266657610
Author: CENGEL
Publisher: MCG CUSTOM
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Chapter 1.11, Problem 113RP
Pressure transducers are commonly used to measure pressure by generating analog signals usually in the range of 4 mA to 20 mA or 0 V-dc to 10 V-dc in response to applied pressure. The system whose schematic is shown in Fig. 1–113 can be used to calibrate pressure transducers. A rigid container is filled with pressurized air, and pressure is measured by the manometer attached. A valve is used to regulate the pressure in the container. Both the pressure and the electric signal are measured simultaneously for various settings, and the results are tabulated. For the given set of measurements, obtain the calibration curve in the form of P = aI + b, where a and b are constants, and calculate the pressure that corresponds to a signal of 10 mA.
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Pressure transducers are commonly used to measure pressure by generating analog signals usually in the range of 4 mA to 20 mA or 0 V-dc to 10 V-dc in response to applied pressure. The system whose schematic is shown can be used to calibrate pressure transducers. A rigid container is filled with pressurized air, and pressure is measured by the manometer attached. A valve is used to regulate the pressure in the container. Both the pressure and the electric signal are measured simultaneously for various settings, and the results are tabulated. For the given set of measurements, obtain the calibration curve in the form of P= a (I) + b, where a and b are constants, and calculate the pressure that corresponds to a signal of 10 mA.
Δh, mm
28
181.5
297.8
413.1
765.9
1027
1149
1362
1458
1536
I, mA
4.21
5.78
6.97
8.15
11.76
14.43
15.68
17.86
18.84
19.64
The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric
pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the
vessel is
1. Pressure transducers are commonly used to measure pressure by generating analogue signals usually in the range of 4 mA to 20 mA or 0 V-dc to 10 V-dc in response to applied pressure. The system whose schematic is shown in Fig. 1 can be used to calibrate pressure transducers. A rigid container is filled with pressurized air, and pressure is measured by the manometer attached. A valve is used to regulate the pressure in the container. Both the pressure and the electric signal are measured simultaneously for various settings, and the results are tabulated in Table 1. i. For the given set of measurements, obtain the calibration curve in the form of P = aI + b, where a and b are constantsii. Determine the values of the constants aand biii. calculate the pressure that corresponds to a signal of 10 mA and 20 mA.Table 1
∆h,mm
28.0
181.5
297.8
413.1
765.9
1027
1149
1362
1458
1536
I,mA
4.21
5.78
6.97
8.15
11.76
14.43
15.68
17.86
18.84
19.64
Chapter 1 Solutions
THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
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