About an automatic analyzer for atmospheric fluoride by the method of fluoride ion slective electrode, an analysis of static and dynamic characteristics and a few errors about measurement system (electrode, amplifier and recorder) was shown in comparison with one hour and three hours of sampling time. On the basis of these analysis, the instrumental error of two apparatus measured in an air polluted region was considered. As a result, it was appeared in a part of these data that the instrumental error can't explain only by the drift of the characteristics of measurement system. This suggests that sampling system (Teflon tube, filter and alkali coated spiral tube) sometimes lead to error.
For measurement of atmospheric fluoride under the level of 1 ppb, counterplans of improvement in accuracy which can be done easily are to set a compensation device for variation of temperature and to exchange the recorder which is linear about concentration for that which is linear about electrode potential.
Further, decrease of flow rate from setting value by drop of pressure in flow meter which lead to error about any measured value must be correct by change of span balue of recorder or others.
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