APPARAT TIL DETEKTERING AF IONISERINGSNIVEAU I ET GASFORMIGT MILJOE

摘要

The ionization is brought about by an electric arc in a chamber 4 which is connected to the surrounding environment through the protection grating 5. The electrodes E3, E4 for measuring the conduction level depending on the ionization level makes it possible to re- excite an electrical discharge between E1 and E2 counting from a given threshold by means of the feedback circuit 10 which controls the port 9 and triggers the discharge of the capacitor C1 in the winding 8. Regulation of the discharge frequency makes it possible to find the variations in the ionization level. <IMAGE>