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Antarctica Test Results

Antarctica Test Results
The following test data was supplied by Lars Kalnajs from the Laboratory of Atmospheric and Space Physics - University of Colorado at Boulder, CO, USA. The findings relate to comparative testing of an Aeroqual Series 500 ozone monitor with a Thermo Electron TEI49C UV photometer conducted in Antarctica at sub-zero temperatures ~ -35° Celsius.

The Aeroqual Series 500 (S500) instrument was housed in a weather proof case (pelican case) with a secondary fan drawing air through a FEP Teflon inlet and over the S500 sensor head. This kept the instrument out of the weather and at a reasonably constant temperature of around -30°C. A larger battery bank and solar module was added for providing auxiliary power. The initial calibration of the S500 before shipping to Antarctica was within <5 ppb of the Thermo Electron TEI49C photometer at 25°C in the university laboratory. However, out on the ice (at temperatures ~ -35°C) a correction factor of 1/2.08 was applied to the raw data from the S500. This yielded very good agreement with the TEI49C and, very impressively, did not drift over 3 months of near continuous measurements. A plot of quick look data is shown below and compares the performance of the S500 (in red) with the TEI49C (in white(.

Data comparison of ozone monitors at O3 mixing ratios at ~ -35ºC

S500 (red) and TEI49C (white) plotted against time

Aeroqual does not claim the same accuracy for its ozone sensors as UV photometers at operating temperatures below -5°C. However, with an appropriate enclosure and correction factor determined against a reference instrument (if required), Aeroqual instruments perform well at sub zero temperatures, exhibiting low drift and tracking similar trends to scientific instruments with readings well within the specified accuracy level (± 8 ppb from 0 to 0.1 ppm and ± 10% from 0.1 to 0.5 ppm).

 
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Published on: 2014-03-02 19:23:02 (1390 reads)

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