FIRE ALARM SENSOR Russian patent published in 2011 - IPC G08B17/10 

FIELD: fire safety.

SUBSTANCE: sensor comprises a pneumatic relay 5, connected with a sensor tube 1 and made in the form of one or more chambers 4, covered with a diaphragm and with an electrode 7, arranged opposite to it. The flexible diaphragm may contact with the electrode and break the contact under action of pressure change in the tube. The open end of the sensor tube communicates with the cavity of the chamber (chambers) limited with a diaphragm, and the sensor tube is made of metal and is filled with a substance that may be saturated with hydrogen at low temperatures and adsorb it when heated in the specified range of temperatures, besides, the substance is made in the form of a thread, being saturated with hydrogen in process of sensor manufacturing. At the same time the metal thread is placed into an armour made of basalt threads.

EFFECT: increased accuracy of sensor actuation due to even distribution of active substance along the sensor tube.

5 cl, 3 dwg