Further modification of a commercial NOx detector for high sensitivity
- 1 December 1984
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 55 (12) , 1995-1998
- https://doi.org/10.1063/1.1137694
Abstract
We describe modifications of a commercial NOx detector for very high sensitivity and ease of computer assisted data acquisition. These changes include a larger gold‐coated reaction chamber, increased ozone flow, a faster vacuum pump, analog outputs to define mode and range status, and enhanced cooling for the PMT. The detection limit, defined as a signal‐to‐noise ratio of 1:1 at the ±2 σ level is about 10 ppt with a 1/e response time of about 20 s or about 45 ppt for 1 s. Detection of other reactive nitrogen compounds is also discussed.Keywords
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