公开(公告)号：DE2600278A1

公开(公告)日：1977-04-14

申请号：DE2600278

申请日：1976-01-07

Applicant: ELECTRO SIGNAL LAB

Inventor： ENEMARK ROBERT BRUUN

IPC: G08B17/107 ,  G01N21/28 ,  G08B17/10

公开(公告)号：DE2312977A1

公开(公告)日：1973-09-27

申请号：DE2312977

申请日：1973-03-15

Applicant: ELECTRO SIGNAL LAB

Inventor： ENEMARK ROBERT BRUUN

IPC: G08B17/107 ,  G08B23/00

Abstract: In a smoke detector a regulated, half-wave rectifier supplies power for an exciter lamp, a photocell shielded from the lamp but viewing an area illuminated by the lamp, and a relay switching circuit triggered by the cell for applying the half-wave current to the winding of a horn so as to cause the horn to sound at the half-wave frequency when the cell senses smoke scattered from the illuminated area. The switching circuit for the horn can also be triggered by a thermostatic switch responsive to high ambient temperature. Failure of the exciter lamp or voltage regulator deenergizes the relay, switching in a pulsing circuit which sounds the horn at a distinctively different frequency than the smoke alarm.

公开(公告)号：DE2310817A1

公开(公告)日：1973-09-06

申请号：DE2310817

申请日：1973-03-05

Applicant: ELECTRO SIGNAL LAB

Inventor： ENEMARK ROBERT BRUUN

IPC: G01N21/25 ,  G08B17/107 ,  H04B9/00