FIRE SIGNALLING DEVICE Russian patent published in 1994 - IPC

FIELD: automatic devices of fire-extinguishing systems. SUBSTANCE: fire signalling device has sensitive-and-amplifying circuit made up of temperature transducer 1, relay 2, trimming resistor, monitoring resistor 3 which is connected to power source through voltage divider resistors 4,5 and switch 6; device has also signalling element 7 which is connected to power source through make contact of relay 2. Relay of polarized type is of two-winding design. Additional winding 9 of relay is connected through trimming resistor 8 to stabilized power source in opposite polarity relative to temperature transducer. EFFECT: enhanced functional reliability of device. 1 dwg