Sensitivity compensated fire detector

Details Sensitivity compensated fire detector Sensitivity compensated fire detector

1976-07-19

1978-06-27

Caldwell Sr., John W.

Communications: electrical

Systems

Call station

250381, 323 22R, 307297, G08B 1710

Patent

active

040978516

ABSTRACT:
A fire detector of the ionization type is characterized by sensitivity compensating circuitry. The detector includes an ionization chamber in series circuit with a reference impedance to form a voltage divider, and circuitry for sensing the voltage at the juncture between the ionization chamber and reference impedance and for generating a current flow which changes in value with changes in the voltage. The sensitivity compensating circuitry monitors the current flow, and for slowly occurring changes corresponding to slow changes in the juncture voltage adjusts the current flow to and maintains the flow at a quiescent value. The compensating circuitry responds relatively slowly to changes in current flow, and therefore does not significantly affect the current flow in response to a rapid change in juncture voltage. Thus, upon the occurrence of products of combustion within the ionization chamber, a relatively rapid change occurs in the juncture voltage to cause at least a predetermined change in the current flow, in response to which an alarm is generated.

REFERENCES:
patent: 3603949 (1971-09-01), Walthard
patent: 3714433 (1973-01-01), Kobayashi
patent: 3778800 (1973-12-01), Blackwell et al.
patent: 3798625 (1974-03-01), McMillian et al.
patent: 3932850 (1976-01-01), Conforti et al.
patent: 3946374 (1976-03-01), McMillian et al.

Affiliated with

Also associated with

Rating

Sensitivity compensated fire detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sensitivity compensated fire detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensitivity compensated fire detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2307860