IONIZATION FIRE ALARM Russian patent published in 2002 - IPC

FIELD: fire alarm systems, particularly, instruments of alarm signal formation at initial stage of ignition, that is, during smoke appearance. SUBSTANCE: ionization fire alarm consists of body whose upper compartment is sealed and provided with moisture absorber, for instance, silica gel, and electronic circuit of fire alarm. Body lower compartment has through recesses located at angle to body longitudinal axis. Recess width is smaller than or equal to body wall thickness. Body lower compartment accommodates identically made standardized chamber and measurement ionization chamber which are connected with electronic circuit. Sources of ionization radiation are located inside chambers. Installed along chamber axis are springs wound round sources of ionizing radiation of standardized and measurement chambers. Device for checking for operation connected with optical indication, for instance, with light emitting diode, may be made in form of pushing button and connected with spring of measurement chamber. Offered device may be used in rooms characterized by large drop of temperatures, high humidity, effect of ionizing substances. EFFECT: higher efficiency of operation of device in particularly complicated conditions of operation, simplified adjustment of device under conditions of series production. 2 cl, 2 dwg