Dangerous condition warning device incorporating a replaceable s

Details Dangerous condition warning device incorporating a replaceable s Dangerous condition warning device incorporating a replaceable s

1997-10-10

1999-04-20

Mullen, Jr., Thomas J.

Communications: electrical

Condition responsive indicating system

Specific condition

340632, 3406935, G08B 2100

Patent

active

058960910

ABSTRACT:
A dangerous condition warning device for issuing an alarm when a dangerous condition is sensed incorporates a circuit including a replaceable dangerous condition sensor, a processor coupled to the sensor for periodically determining the ambient concentration of a potentially dangerous substance (e.g., CO) and a horn to issue alarm signals if indicated, the processor also periodically checking the integrity of the sensor, and the device incorporates sensor placement apparatus for facilitating removing and correctly replacing a sensor of suspect integrity. The sensor has an outer periphery and a reduced dimension portion employed as first and second electrodes. The sensor placement apparatus includes a sensor receptacle; a first contact member positioned to contact the reduced dimension portion of the sensor when the sensor is correctly emplaced and to electrically connect to the outer periphery of the sensor when the sensor is incorrectly emplaced. A second contact member is positioned to contact the outer periphery of the sensor when the sensor is both correctly and incorrectly emplaced. Thus, when the sensor is incorrectly installed, an electrical short results to which the processor responds by issuing an alarm to signify incorrect sensor installation.

REFERENCES:
patent: 4583072 (1986-04-01), Matsushita
patent: 4647219 (1987-03-01), Figler et al.
patent: 4884065 (1989-11-01), Crouse et al.
patent: 5095300 (1992-03-01), Alexander et al.
patent: 5103216 (1992-04-01), Sisselman
patent: 5122782 (1992-06-01), Kawahara

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