Oakton 35632-Series Operating Instructions Manual
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Contents
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676614. Appendix 1: Meter TheoryDissolved oxygen levels in natural and waste waters depend on the physical,chemical, and biochemical activities in the water body.This meter uses a galvanic probe. It consists of a cell that contains electrolyte andthat is enclosed by a selective membrane, and two metallic electrodes. The mem-brane is practically impermeable to water and ionic dissolved matter, but is perme-able to oxygen and a few other gases.The cathode consumes the oxygen passed through the membrane, and produces anelectric current in the probe. This current is proportional to the partial pressure ofoxygen in the sample.Since the cathode consumes the oxygen in the sample, it is essential that the fluidmust flow past the sensor to maintain accurate readings.The solubility of oxygen in water varies with barometric pressure and temperature,and decreases as salinity increases. For the most accurate DO readings, you needto compensate for these factors. This meter automatically compensates for tempera-ture readings. It also allows you to enter a salinity correction factor and the baromet-ric pressure to correct for this variability.15. Appendix 2: Pressure vs. Altitude tableBarometric pressure affects DO readings, therefore this meter lets you enter the cor-rect barometric pressure at your altitude. If you do not have equipment that lets youmeasure the exact barometric pressure at your altitude, you can estimate it using thechart below.If you change the barometric pressure setting from its factory setting (760 mm Hg),the % saturation calibration value in air will automatically adjust to a value otherthan 100% (see “corrected % saturation value” column below). The adjusted value iscorrect for the new barometric pressure setting.See page 39 or 47 for information on how to adjust the barometric pressure.Pressure vs AltitudeAltitude (ft) Pressure (mm Hg) Corrected % saturation value0 (Sea level) 760 100500 746 98.11000 732 96.31500 720 94.72000 707 93.02500 694 91.33000 681 89.63500 668 87.84000 656 86.24500 644 84.65000 632 83.05500 621 81.66000 609 80.0 |
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