Title:
【発明の名称】選択作動可能な火災感知器
Document Type and Number:
Japanese Patent JPS6017157
Kind Code:
B2
Abstract:
A selectively testable fire detector comprises a fire detecting circuit supplied with a first voltage and which detects smoke and/or temperature, a self-holding circuit which is actuated by the output signal of the fire detecting circuit, a counter which counts pulses superimposed on the first voltage and outputs a signal when the counted number reaches a predetermined number assigned thereto, a latch circuit which latches the output signal of the counter and transmits to the fire detecting circuit a signal which actuates the fire detecting circuit, and a reset signal generating circuit which resets the counter and latch circuits by a second voltage which is higher than the first voltage.
Inventors:
SASAKI ISAO
Application Number:
JP2549581A
Publication Date:
May 01, 1985
Filing Date:
February 25, 1981
Export Citation:
Assignee:
NITTAN CO LTD
International Classes:
G08B17/06; G08B17/00; G08B17/10; G08B29/14; (IPC1-7): G08B17/06; G08B17/00; G08B17/10
Attorney, Agent or Firm:
Takeshi Kikuchi