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    美國2B Model-106H臭氧檢測儀原版手冊

    下載次數:269 瀏覽次數:403發布時間:2015-09-26 18:51
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    where l is the path length (0.1 cm) and . is the absorption cross section for 

    ozone at 254 nm (1.15 x 10-17 cm2 molecule-1 or 308 atm-1 cm-1), which is 

    known with an accuracy of approximately 1%. The 2B Technologies instrument 

    uses the same absorption cross section (extinction coefficient) as used in other 

    commercial instruments. 

    When there is no ozone in the cell, a difference in light intensity at the reference 

    and sample photodiodes can be expected, and it will cause a zero offset in the 

    readings. This light intensity difference is inherent in the instrument due to the 

    different properties of the two photodiodes, drift in the angle of the beamsplitter, 

    contamination in the cell and thermal drift in any of the optical components. 

    The zero drift has been determined to be less than or equal to 2% of full scale 

    per month, non-cumulative and can easily be corrected for by using the zero 

    function described below. The zero drift does not affect the slope calibration 

    factor in any way, and the instrument does not need to be recalibrated after 

    performing the zeroing function. 

    The pressure and temperature within the absorption cell are measured so that 

    the ozone concentration can be expressed as a mixing ratio in percent by 

    volume (vol%). The fraction of the sample that is ozone can then be calculated 

    and used to determine the ozone concentration in percent by weight in either 

    air (Wt.% air) or oxygen (Wt.% O2). The instrument displays and records the 

    cell temperature and pressure in addition to the ozone concentration. The cell 

    pressure is displayed and logged in units of mbar, torr or psia and the cell 

    temperature in units of either oC or K. 

    In principle, the measurement of ozone by UV absorption requires only a zero 

    calibration to account for the different light intensities at the reference and 

    sample photodiodes. However, non-linearity of the photodiode response and 

    electronics can result in a small measurement error. Therefore, each 

    instrument is compared with a reference ozone monitor calibrated to the 

    International Ozone Association (IOA) buffered KI method. These results are 

    used to calibrate the Ozone Monitor with respect to a slope (gain). The 

    correction for slope is recorded in the instrument Birth Certificate. The slope 

    parameter is entered into the microprocessor prior to shipment. The user may 

    change the slope parameter from the front panel if desired. It is recommended 

    that the instrument be recalibrated at least once every year and preferably 

    more frequently. The zero may drift due to temperature change or chemical 

    contamination of the absorption cell. As discussed below, an accurate zero 

    correction can be measured from time to time using zero gas. 

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