Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-02-26
1981-05-26
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340510, 340693, G08B 1710
Patent
active
042701236
ABSTRACT:
A fire detector provided with a warning system, a reference element and an analysis element whose impedance varies in the presence of a rise of temperature and/or radiation and/or combustion gas, said reference and analysis elements being connected in series or in parallel and constituting two adjacent arms of a Wheatstone bridge assembly. The other two arms are constituted by resistors if necessary variable while the measuring diagonal or bridge, joins, either the common connecting points of the resistors and said elements, or respectively the ends of the detector elements. This device is distinguished in that the two ends of the bridge (X and Y) are connected respectively to the two inputs of two voltage comparators (A.sub.1 and A.sub.2), mounted in parallel and in reverse, each connected to a warning system (S.sub.1, S.sub.2) so that unbalance of the bridge creates a signal at the output of one or other comparator according to the direction of unbalance and actuates the corresponding warning system to indicate, respectively, a fire or system malfunction.
REFERENCES:
patent: 3320602 (1967-05-01), Andrews
patent: 3795904 (1974-03-01), Beyersdorf et al.
patent: 3866195 (1975-02-01), Ried, Jr.
patent: 4028689 (1977-06-01), Schopp
pp. 84-86, Electronic Design, vol. 23, No. 12, Jun. 1975.
Swann III Glen R.
Universal Det, S.A.R.L.
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