Title:
PHOTOELECTRIC SENSOR AND FIRE SENSOR SYSTEM
Document Type and Number:
Japanese Patent JP3243115
Kind Code:
B2
Abstract:
PURPOSE: To conduct the operation test and the inoperation test of the photoelectric sensor in a short time as a detailed and easy work.
CONSTITUTION: When a check person approaches a magnet to a test use reed switch 13 and the switch 13 is closed, a resistance of a time constant circuit is decreased to a resistance RT2 only from a combined resistance of RT1, RT2, an oscillation period of an oscillation circuit 14 is short and an operation confirming light emitting element LED 1 and a smoke sensing light emitting element LED 2 start blinking for this period. Furthermore, when a shift register 15 is in enable state and shifted, a light emitting quantity of the test use light emitting element LED 3 is increased stepwise. When the light of the test use light emitting element LED 3 is received by a sensing use light receiving element PD and its voltage corresponding to the light exceeds a reference voltage, a thyristor SCR is turned on and the operation confirming light emitting element LED 1 is continuously lighted. The sensor is tested by the visual count by the check personnel for number of times of blinking of the operation confirming light emitting element LED 1.
Inventors:
Yasuo Torigoe
Naoki Kosugi
Tetsuya Nagashima
Naoki Kosugi
Tetsuya Nagashima
Application Number:
JP9408794A
Publication Date:
January 07, 2002
Filing Date:
May 06, 1994
Export Citation:
Assignee:
Hochiki Co., Ltd.
International Classes:
G08B17/107; G08B29/14; G01N21/53; (IPC1-7): G08B17/107; G01N21/53
Domestic Patent References:
| JP2227800A | ||||
| JP4131996A | ||||
| JP5988797U | ||||
| JP436693U |
Attorney, Agent or Firm:
Susumu Takeuchi (1 person outside)