TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 9: Monitoring Barometric Pressure3. Do one of the following:• If this MP TROLL 9500 has a barometric pressure sensor andvented cable, select “Use vented cable.” Go to step 5.• If the device is on non-vented cable now and will take measurementsusing non-vented cable, select “Use non-ventedcable or backshell.” Continue to step 4.• If the TROLL is on vented cable now but will take measurementson non-vented cable, select “Use non-vented cableor backshell” and also check the last box so a reading can betaken from the barometric pressure sensor while it is available.4. Supply a barometric pressure value for the software to use in theabsence of vented cable. Choose one of these options:• Supply a fixed pressure value in your choice of units (selectunits by clicking the arrow on the list box). This value will beused each time barometric pressure is required elsewhere in thesoftware—for example, when calibrating dissolved oxygen.• Enter your elevation and let the software calculate barometricpressure based on the values in the table on this page. Pleasenote that this fixed value will not be recalculated if the elevationchanges.5. Click OK to store this information.Conversionsbars ∗ 29.530 = inches of mercurypsi ∗ 2.036 = inches of mercuryatmosphere ∗ 101325 = Pascalspsi ∗ 6.894757 ∗ 10 3 = Pascalsbars ∗ 14.50337 = psi345Pressure vs. Elevation(based on U.S. Standard Atmosphere)ElevationPressureft m in. Hg mm Hg PSI Bars-1,000 -304.8 31.02 787.9 15.25 1.051- 500 -152.4 30.47 773.8 14.94 1.0300 0 29.92 760.0 14.70 1.013500 152.4 29.38 746.4 14.43 0.9951,000 304.8 28.86 732.9 14.18 0.9771,500 457.2 28.33 719.7 13.90 0.9582,000 609.6 27.82 706.6 13.67 0.9422,500 762 27.31 693.8 13.41 0.9243,000 914.4 26.81 681.1 13.19 0.9093,500 1066.8 26.32 668.6 12.92 0.8914,000 1219.2 25.84 656.3 12.70 0.8754,500 1371.6 25.36 644.2 12.45 0.8585,000 1524 24.89 632.3 12.23 0.8435,500 1676.4 24.43 620.6 12.00 0.8276,000 1828.9 23.98 609.0 11.77 0.8116,500 1981.2 23.53 597.6 11.56 0.7967,000 2133.6 23.09 586.4 11.34 0.7817,500 2286 22.65 575.3 11.12 0.7668,000 2438 22.22 564.4 10.90 0.7518,500 2590.8 21.80 553.7 10.70 0.7379,000 2743.2 21.38 543.2 10.50 0.7239,500 2895.6 20.98 532.8 10.30 0.71010,000 3048 20.58 522.6 10.10 0.69610,500 3200.4 20.18 512.5 9.91 0.69211,000 3352.8 19.79 502.6 9.73 0.67011,500 3505.2 19.40 492.8 9.53 0.65712,000 3657.6 19.03 483.3 9.35 0.64412,500 3810 18.65 473.8 9.15 0.63113,000 3962.4 18.29 464.5 8.97 0.61813,500 4114.8 17.93 455.4 8.81 0.60714,000 4267.2 17.57 446.4 8.63 0.59514,500 4419.6 17.22 437.5 8.46 0.58315,000 4572 16.88 428.8 8.28 0.57115,500 4724.4 16.54 420.2 8.13 0.56016,000 4876.8 16.21 411.8 7.96 0.54916,500 5029.2 15.89 403.5 7.81 0.538TROLL 9500 Operator’s Manual 570095110 rev. 007 01/09