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s . 's <br />VW Piezometer Calibration Certificate <br />Serial #: 99526 (V W P - 0 6 ) 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 -8.085075E-5 -1.001321E-1 9.507766E+2 <br />psi -1.172641 E-5 -1.452294E-2 1.378985E+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 9.520375E+2 -1.011142E-1 -6.273275E-2 -8.081809E-5 5.889167E-5 -9.773318E-4 <br />psi 1.380765E+2 -1.466486E-2 -9.098296E-3 -1.172126E-5 8.541214E-6 -1.417450E-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 14.0 °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 2865.6 -0.01 -0.1 0.02 <br />5.00 34.5 2803.5 5.02 34.6 -0.04 <br />10.00 68.9 2740.7 10.01 69.0 -0.03 <br />15.00 103.4 2676.9 14.99 103.4 0.01 <br />20.00 137.9 2611.8 19.98 137.8 0.05 <br />25.00 172.4 2544.8 25.00 172.4 0.00 <br />30.00 206.8 2476.8 29.99 206.8 0.02 <br />35.00 241.3 2406.9 35.01 241.4 -0.02 <br />40.00 275.8 2335.6 40.01 275.9 -0.02 <br />45.00 310.3 2262.7 45.00 310.3 0.00 <br />50.00 344.7 2187.9 49.99 344.7 0.02