Fault detection in a flame scanner

Details Fault detection in a flame scanner Fault detection in a flame scanner

1980-09-08

1982-03-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340507, 340511, 340600, G08B 1712

Patent

active

043227236

ABSTRACT:
A flame scanner has a sensing circuit (10) utilizing a photosensitive device (12) for monitoring and a logic circuit (20) which includes a flame detection circuit (22) and a fault detection circuit (24). The photosensitive device produces a current signal (13) indicative of the intensity of the flame. The current signal is fed to a logarithmic amplifier (14) and converted to a voltage signal (15). The voltage signal (15) powers an LED (18) with its output (4) impinging on the photosensitive device (12). The voltage signal (15) is also transmitted to the flame detection circuit and the fault detection circuit for simultaneous and independent processing. The flame detection circuit continuously processes the signal to determine if a stable flame is present, while the fault detection circuit continuously monitors the integrity of the photosensitive device and its associated sensing circuitry.

REFERENCES:
patent: 3476945 (1969-11-01), Golden et al.
patent: 3538332 (1970-11-01), Gilbert
patent: 3594746 (1971-07-01), Pileika et al.
patent: 3846772 (1974-11-01), Peberdy
patent: 4039844 (1977-08-01), MacDonald
patent: 4242669 (1980-12-01), Crick

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