Fire detection apparatus in a preheater

Details Fire detection apparatus in a preheater Fire detection apparatus in a preheater

1976-12-16

1978-07-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

165 5, 165 11, 340599, 340 57, G08B 1706

Patent

active

040991652

ABSTRACT:
A fire detection apparatus in a rotary regenerative air preheater comprises a plurality of temperature sensitive detectors which produce an electrical signal, and means for differentiating the electrical signals from the detectors. The differentiated signals are passed through a low pass filter having a large time constant and are then fed to a comparator which actuates a signalling device when the low pass filter output signal exceeds a predetermined value.

REFERENCES:
patent: 2901740 (1959-08-01), Cutsogeorge
patent: 3060417 (1962-10-01), Blake
patent: 3775745 (1973-11-01), Kelley
patent: 3861458 (1975-01-01), Ostrander et al.

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