By Andrew G. Clarke (auth.), Dr Andrew G. Clarke (eds.)
Developed from a quick direction taught at Leeds collage, this publication covers equipment of tracking emissions of air toxins from desk bound resources. It surveys the concepts and issues out their benefits and disadvantages.
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Another section of this standard discusses performance characteristics for automated methods of measuring S02. Older standards covering auto- Monitoring requirements 17 mated methods of analysis are so dated as to be of little relevance. Methods for the preparation of calibration gases, which are discussed in Chapter 13, are detailed in the various sections of BS 4559. All these are listed in Appendix A. It is likely that in the future the UK will, wherever possible, adopt international (ISO) or European (CEN) standard methods rather than going it alone in the production of a large number of new national standards.
It has a single hole at the end of a tip facing into the flow and a series of holes around the tube at right angles to the flow. The pressure difference is given by Llp =;/zp(VOuct)2 where p is the gas density and relationship rearranges to VOue! VOue! is the duct gas velocity. The = Y2Llp/p The velocity is related to the square root of the pressure difference which is measured either by an inclined-tube manometer or an electronic micromanometer. \ \ I~ ~~ \ - "--- ~ ~ ~ c 0 u Q) Ba o ""'~ Q. 0 Sampling Velocity/Free Stream Velocity Fig.
4. If the velocity into the nozzle is too low (undersampling) there is a divergent gas flow. Some of the larger particles will not follow the streamlines as they pass round the outside of the nozzle but will carryon into the sampling system. The measured concentration is then too high. 2 Recommended number of sampling points according to different standards Circular flue Rectangular flue Diameter (m) No. of diameters No. of sampling points Hydraulic diameter (m) Area (m2) No. 61 X X 2) 2) 9 (3 X 3) 9 (3 X 3) 12 (4 X 3) * Diameters t in brackets do not appear in the standards but are derived from the areas.
Industrial Air Pollution Monitoring by Andrew G. Clarke (auth.), Dr Andrew G. Clarke (eds.)