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VW Piezometer Calibration Certificate <br />Serial #: 99524 (V W P- 08) Part #: 52611020 <br />Range : 50 psi Cable Part #: 50613524 <br />Cable Length: 400 ft Calibrated by: KB <br />Date of Calibration: 5/11/2009 Note: <br />ABC Calibration Factors <br />A B C <br />kPa -9.364356E-5 -9.181031 E-2 9.973011 E+2 <br />psi -1.358185E-5 -1.331596E-2 1.446463E+2 <br />Pressure in kPa/psi = (A x Hz2) + (B x Hz) + C, where Hz is frequency in Hertz. <br />TI Calibration Factors <br />CO C1 C2 C3 C4 C5 <br />kPa 9.949864E+2 -9.089575E-2 8.860420E-3 -9.406752E-5 7.957092E-5 -1.377945E-3 <br />psi 1.443055E+2 -1.318285E-2 1.285050E-3 -1.364286E-5 1.154038E-5 -1.998470E-4 <br />Pressure in kPa/psi = CO + (Cl x Hz) + (C2 x T) + (C3 x Hz2) + (C4 x Hz x T) + (C5 x T2) <br />Where Hz is the frequency reading in Hertz and T is the Thermistor reading in degrees C. <br />TI factors are calculated from temperatures at 5.0, 15.0 and 25.0 degrees C. <br />Applied pressure and temperature are NIST traceable. <br />Summary of Test Results at 15°C <br />Thermistor reading is 14.4 °C. <br />Applied Pressure is referenced to 1 atm. Calculated Pressure uses ABC Calibration factors. <br />Applied Equivalent Frequency Calculated Error <br />(psi) (kPa) (Hz) (psi) (kPa) (%FS) <br />0.00 0.0 2809.7 0.01 0.1 -0.02 <br />5.00 34.5 2753.5 5.01 34.5 -0.01 <br />10.00 68.9 2696.5 9.98 68.8 0.03 <br />15.00 103.4 2638.2 14.99 103.4 0.03 <br />20.00 137.9 2578.8 19.98 137.8 0.03 <br />25.00 172.4 2518.1 25.00 172.4 0.01 <br />30.00 206.8 2456.0 30.02 207.0 -0.03 <br />35.00 241.3 2392.9 35.01 241.4 -0.03 <br />40.00 275.8 2328.4 40.01 275.9 -0.02 <br />45.00 310.3 2262.4 45.00 310.3 0.00 <br />50.00 344.7 2194.9 49.99 344.7 0.03