Fail-safe monitoring system

Details Fail-safe monitoring system Fail-safe monitoring system

1982-10-07

1985-09-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

340578, 431 79, H05B 3300

Patent

active

045408866

ABSTRACT:
A fail-safe system for monitoring a condition and activating controls in response either to the non-existence of that condition or the failure of any component in the system, in which a preliminary fail-safe oscillation train derived from sensing the condition is converted into a steady state indication of that condition, and a secondary fail-safe oscillation train is generated in a fail-safe way from said steady state indication for further transmission downstream for control purposes. In the context of flame monitoring, means associated with the preliminary oscillation train are provided for discriminating between separate flames and for time delay purposes.

REFERENCES:
patent: 3852606 (1974-12-01), Kabat
patent: 3914662 (1975-10-01), Bianchini
patent: 4038019 (1977-07-01), Matthews
patent: 4260362 (1981-04-01), Matthews
patent: 4395638 (1983-07-01), Cade

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