The Use of a Pressure Transducer - Lab Report Example

ME 4506 Lab Report Lab Lab Submitted: cc: Introduction The experiment purpose is to learn how to calibrateand use a pressure transducer, pressure gauge a read out system (voltmeter), signal conditioner and a computer-based data acquisition system. Equipment 1. Pressure transducer. A pressure transducer is a device that outputs a voltage in proportion to an applied pressure difference. 2. Pressure Gauge. A pressure gauge is an instrument that can be used to measure pressure differences. Pressure is determined by measuring the deflection of the pressure gauge hand stick on the scale in response to an applied pressure difference. You will use the pressure gauge to calibrate the pressure transducer and then perform an uncertainty analysis and compare your pressure transducer calibration to the manufacturer’s calibration. 3. Voltmeter. Used to measure the voltage across any electrical connection. Procedure The connectors on the ‘pizza box’ are shown in the Figure 1 below. The connectors interfaces with the computer. 1. Excite the pressure transducer, with a voltage of 10v. The figure above had J17 and J18 as AO (Analog Out). It has a signal condition module (module model SCC-FT01) connected to J17. This provided input or output voltages of -10V to +10V. 2. Connect the BNC cable, shown in Figure 2 below, to Thermistor/Pressure EX J17 on the signal condition ‘pizza box’ on the side of computer cart to the pressure transducer interface box BNC connector labeled “Excitation”. 3. Capture the signal generated by the pressure transducer. Connect the Thermistor /Pressure output signal to J8 that has an SCC-FTO1 module that acquired the analog voltage and pass it into data acquisition System. 4. Connect the actual pressure sensor to the pressure transducer interface box using red, black and green binding post as shown in Figure 3. Pressure Transducer Interface Box Figure 3: Layout of pressure transducer interface box Results The results obtained were as given below. Room Pressure (mmHg) = 7 6. 9. Weight of Piston (psig) = 5. 0. Table 1 shows a data of calibration where weight is measured alongside an increasing and decreasing pressure. Table 2 shows the final calibration data obtained from the pressure transducer. Table 2: Final Calibration Data Data Theoretical Error PASS/FAIL Required +/- Zero -0. 0 0 0 2 0. 0 0 4 8 -0. 0 0 5 0 PASS 0. 0 0 0 0 0. 1 0 0 0 ½ Scale 2. 5 0 7 4 2. 5 0 2 4 0.0 0 5 0 Full Scale 4. 9 9 4 9 4. 9 9 9 9 -0. 0 0 5 0 5. 0 0 0 0 ½ Scale 2. 5 0 7 4 2. 5 0 2 4 -0. 0 0 4 6 Zero 0. 0 0 0 2 0. 0 0 4 8 PASS Sensitivity 4. 9 9 5 1 4. 9 9 5 1 PASS 5. 0 0 0 0 0. 0 7 5 0 Linearity 0. 1 0 0 6 Hysteresis 0.0 0 8 0 Combined 0. 1 0 0 6 PASS Combined Accuracy Spec 0. 2 5 % FS Figure 4: Calibration Curves Figure 4 shows the calibration curves for the table 1 above The table 3 below showing the data found from regulator test. Table 3: Regulator Test Regulator Dial Transducer Decreasing (bar) 3 .8 3 .6 3 .4 3 .2 3 .0 2 .8 2 .6 2 .4 2 .2 2 .0 1 .8 1 .6 1 .4 1 .2 1 .0 0 .8 Increasing (bar) 3 .8 3 .6 3 .4 3 .2 3 .0 2 .8 2 .6 2 .4 2 .2 2 .0 1 .8 1 .6 1 .4 1 .2 1 .0 0 .8 Decreasing (psig) 5 5 .1 1 5 2 .2 1 4 9 .3 1 4 6 .4 1 4 3 .5 1 4 0 .6 1 3 7 .7 1 3 4 .8 1 3 1 .9 1 2 9 .0 1 2 6 .1 1 2 3 .2 1 2 0 .3 1 1 7 .4 0 1 4 .5 0 1 1. 6 0 Increasing (psig) 5 5 .1 1 5 2 .2 1 4 9 .3 1 4 6 .4 1 4 3 .5 1 4 0 .6 1 3 7 .7 1 3 4 .8 1 3 1 .9 1 2 9 .0 1 2 6 .11 2 3 .2 1 2 0 .3 1 1 7 .4 0 1 4 .5 0 1 1. 6 0 Decreasing (psig) 5 5 .5 0 5 2 .5 0 5 0 .0 0 4 7 .5 0 4 5.0 0 4 2 .0 0 3 9 .5 0 3 6 .0 0 3 2 .5 0 3 0 .0 0 2 7 .5 0 2 3 .5 0 2 1 .0 0 1 7 .5 0 1 5 .0 0 1 1 .0 0 Increasing (psig) 5 0 .0 0 4 7 .0 0 4 5 .0 0 4 2 .0 0 3 8 .7 5 3 6 .0 0 3 2 .5 0 2 9 .5 0 2 7 .0 0 2 5 .0 0 2 2 .0 0 1 7 .5 0 1 6 .0 0 1 2 .0 0 Decreasing (psig) 5 5 .3 5 5 2 .4 8 4 9.8 9 4 6 .8 5 4 5 .5 8 4 1 .6 6 3 8 .8 5 3 5 .6 5 3 2 .4 4 2 9 .2 4 2 6 .9 3 2 3 .4 1 2 0 .5 3 1 7 .6 5 1 4 .9 1 1 0 .4 5 Increasing (psig) 49.65 47.82 45.46 42.20 38.50 36.22 32.85 29.50 27.50 24.66 21.77 17.91 15.75 12.15 Analysis 1. The calibration curves are as plotted in the figure 4 above. 2. The instrument had a linearity of 0 .1 0 0 6, hysteresis 0.0 0 8 0 and combination of 0. 1 0 0 6 as shown in the above table 2. Maximum amplitude found on the CRO was 0.9and minimum at 0. 1 at time 0.0 0 and 1. 0 m respectively as shown in figure 6 below. 3. Arithmetic mean as found was 0. 0 8 6 6 5 6 2, mode 0.0 1 5 5 8 2, median 0. 0 7 6 1 4 1and standard deviation of 0. 0 6 2 5 4 2 at a pressure of 0. 1 9 8 3 6 4 psi as given on figure 6 below. Discussion Some of the data obtained deviated due to change in the environment temperature affecting the pressure of the area. This was rectified by performing the experiment under controlled environment of controlled pressure and temperature. Appendices Figure 1: Layout of scc connectors Figure 2: Bnc connector Figure 6: Cro data Figure 5: Final Calibration Report Figure 7: Connection Block Read More