Combination detector

Communications: electrical – Condition responsive indicating system – Specific condition

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Details

340629, 340630, G08B 1710

Patent

active

044019785

ABSTRACT:
A combination optical and ionization detector for providing a more complete range of detection including detection of larger particles of combustion and smaller sub-micron particulates. Each detection channel (optical and ionization) may be independently calibrated and each has means such as an indicator light to identify which channel has alarmed. Each channel has detection circuitry for establishing both a pre-alarm condition and a full alarm condition. Differing alarm states are determined by the generation of audibly or visually distinguishable signals. For example a short signal may indicate a pre-alarm condition while a long, coded or modulated signal may indicate a full alarm condition. A further distinctive signal may indicate activation of two or more detectors. A supervisory channel may also be provided to detect, for example, circuit component failure. Preferably there is an adjustable delay period before either a pre-alarm or full alarm is signaled with the adjustable period being reset to zero if the alarm condition is interrupted.

REFERENCES:
patent: 2825894 (1958-03-01), Marmorstone
patent: 3611365 (1971-10-01), Lundquist et al.
patent: 3801972 (1974-04-01), Hokim et al.
patent: 3866195 (1975-02-01), Ried, Jr.
patent: 3868663 (1975-02-01), Ray
patent: 3909813 (1975-09-01), Scheidweiler et al.

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