FIELD: fire alarms, particularly devices adapted to control fire alarm performance.
SUBSTANCE: case has lid provided with extension used as button and having figured cut. The extension is connected to cylindrical pin arranged from inner lid side and passing into smoke chamber as a result of pressing the extension so that infrared radiation emitted by light-emitting diode falls on photodiode. Detector workability is indexed by light-emitting diode.
EFFECT: simplified signal passage control.
3 dwg
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