Write a full conclusion on the experiment “Pressure measurement and calibration, Boyle’s law “, using the results and discussion provided in the image below. The aim of the experiment is ”To obtain basic knowledge of the concept of pressure and the ways of measuring pressure, as well as to investigate the behaviour of different types of pressure sensors.”
Results:
Discussion:
Mass On Applied Applied Applied Needle Indicated Semiconductor Indicated Piston Mass (kg) Force (N) Pressure angle Bourdon output e (mV) semiconductor (kg) ( (degrees) pressure pressure Ps Pb (KN/m2) 0.504 o 4.94 20.58 27 19 12.2 16 0.504 0.5 9.85 41.04 55 37 19.6 32 0.504 1 14.75 61.46 79 59 26.9 49 0.504 1.5 19.66 81.92 104 77 33.9 64 0.504 24.56 102.33 131 99 41 80 0.504 2.5 29.47 122.79 154 114 47.5 94 0.504 3 34.37 143.21 184 137 55 110 0.504 3.5 39.28 163.67 210 157 63 128 0.504 4 44.18 184.08 234 173 69.2 141 0.504 4 44.18 184.08 239 187 70 143 0.504 3.5 39.28 163.67 212 158 62.8 127 0.504 34.37 143.21 186 137 55.3 110.5 0.504 2.5 29.47 122.79 160 119 47 93 0.504 2 24.56 102.33 133 99 41 81 0.504 1.5 19.66 81.92 107 80 34 66 0.504 Ay 14.75 61.46 81 60 26.9 49 0.504 0.5 9.85 41.04 54 40 18.9 33 0.504 4.94 20.58 27 50 12.6 17
In the graph above below, the Bourdon pressure sensor output which is represented by the
pressures. These deviations suggest that while the Bourdon sensor might be quite accurate for most pressure ranges, its accuracy might decrease slightly at higher pressures. The semiconductor sensor output represented by the red curve, also demonstrates a near- linear relationship with the applied pressure. The semiconductor sensor is observed to be quite consistent and linear across the entire pressure range.
To calculate the indicated pressure from arbitrary sensor readings, some things need to be measured. For the Bourdon gauge, the needle angle would be measured and then to the blue curve (Bourdon Pressure Sensor) would be referred to in order to determine the corresponding pressure. For the semiconductor sensor, the output voltage would need to be measured and then the red curve (Semiconductor Sensor) would be used to deduce the corresponding pressure.
In practice, a calibration curve similar the ones shown in the graph, would be used to
simple linear interpolation between known calibration points can be used to determine
then a polynomial fitting or other curve fitting techniques can be employed. In summary, both sensors demonstrate near-linear behaviour across the range of applied pressures, though minor deviations are observed for the Bourdon gauge at higher pressures.
Applied Pressure vs Indicated Pressures
Two things of which the reliability of the experiment depend on are the apparatus being primed and the calibration of both the pressure gauge and pressure sensor, as they are essential for accurate and reliable results. Some of the reasons why priming is important in
Boundon Pressure -Semiconductor Pressure 175
It calibrates the measurement device to zero pressure, and it ensures consistent starting conditions for reproducibility. Accurate measurements are crucial for the validity and credibility of experimental results. Pressure gauges and sensors can drift over time due to factors such as wear and tear, environmental conditions, or electronic interference. In
are essential steps in pressure measurement. Priming removes air and gas bubbles that
accurate and reliable. Hence by following these steps, it can be ensured that the pressure measurements are accurate and reliable, leading to trustworthy experimental outcomes.
50
Some of the things which might of lead to errors in the calibration during the test include, calibration set up was out of order or invalid, signal input was out of range, or the secure code provided was invalid. Other methods which can be used for the improvement of the calibration of pressure gauges are sensors include, calibrating just the electronics with a simulator, calibrating both the electronics and the sensor in a dry-well, calibrating both the electronics and the sensor in a dry-well with a reference thermometer and calibrating the pressure gauge with a dead weight tester.
25
20
40
60
30 100 120 Applied Pressure (kN/m2)
140
160
180
