The Art of Practical and Precise Strain Based ... - Webprofile.info
The Art of Practical and Precise Strain Based ... - Webprofile.info
The Art of Practical and Precise Strain Based ... - Webprofile.info
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<strong>Strain</strong>-<strong>Based</strong> Measurement Introduction:tical to the electrically-referenced absolute method except that the zerooutput <strong>of</strong> the sensor is not artificially elevated. <strong>The</strong> same lead exit pressureconsiderations apply in the case <strong>of</strong> the psis device as apply in thepsia-electrically-referenced sensor. Reference Figure 1-43.FIGURE 1-43. <strong>The</strong> Sealed-Gage Reference:OutputAppliedPressureSeal (usually epoxy)Lead wiresAtmospheric Pressure Sealed Inside0mV-14.7 mV@ 1mV/Psis14.7 PsiaPressurePSIG (Gage Pressure):<strong>The</strong> internal cavity <strong>of</strong> the psig-referenced device is deliberately ventedto atmosphere. Bending <strong>of</strong> the sensor diaphragm will be in proportionto the difference in pressure between the measur<strong>and</strong> <strong>and</strong> the nominalatmospheric pressure present at the reference port. Reference Figure 1-42.FIGURE 1-44. <strong>The</strong> Gage Pressure Reference:Output@ 1 mV/PsigApplied PressureAtmospheric Pressure0 mV-14.7 mVPressureAtmospheric(Approximately 14.7 Psia)CHAPTER 1-76 <strong>The</strong> <strong>Art</strong> <strong>of</strong> <strong>Practical</strong> <strong>and</strong> <strong>Precise</strong> <strong>Strain</strong> <strong>Based</strong> Measurement 2nd Edition © 1999