Community Research and Development Information Service - CORDIS

Abstract

The analysis of the polluting gases that are regulated by the European directives (SO(2), NO/NO(2) O(3)) is done by automatic analysers which are regularly calibrated in monitoring stations. The automatic calibration by means of stationary devices, regardless of whether they are integrated into the analyser or not, is only applied in 60% of the stations in the European Union becasue of the uncertainty about the choice of the device and the costs.

For over a year an in-situ study has been undertaken with the aim of testing six automatic calibration devices in the stations of the French network ASPA and of the German Network UMEG. These devices were different in the type of calibration standard (bottle low concentration, dilution, permeation, titration in gas phase), in the diluting and measuring devices of the flow rate and in the procedure for acquiring the data. The test took into account the degree of automation of the control calibration as well as the automatic correction of the calibration differences and the constraints of the site. The verification of the stability of the tested equipment was guaranteed by a quality assurance programme of ERLAP.

The test results have been evaluated in relation to the calibration quality in terms of stability and reliability of the devices and in relation to the investment costs and the running of the station. Of all the tested calibration devices, the diluter-type combined with a ozone generator, which also offers the possibility to run a titration cycle in gas phase, could be the choice likely to satisfy the needs of the stations. The other systems, less complete, give relatively acceptable results where the use of ozone generators for calibration purposes is excluded.

Additional information

Authors: CLAUSS G, Association pour la Surveillance et l'Etude de la Pollution Atmosphérique en Alsace, Madrid (ES);PAILLARGUES T, Association pour la Surveillance et l'Etude de la Pollution Atmosphérique en Alsace, Madrid (ES);WALENDA R, Gesellschaft für Umweltmessungen und Umwelterhebungen mbH, Karlsruhe (DE);PESCH P, Gesellschaft für Umweltmessungen und Umwelterhebungen mbH, Karlsruhe (DE);GERBOLES M, JRC Ispra (IT);PAYRISSAT M, JRC Ispra (IT)
Bibliographic Reference: EUR 16365 FR (1996) 96pp., FS
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT)
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top