EP 0884534 A1 19981216 - Flame detection and controlling the flow of fuel to a burner
Title (en)
Flame detection and controlling the flow of fuel to a burner
Title (de)
Flammendetektion und Regelung des Brennstoffstromes zu dem Brenner
Title (fr)
Détection d'une flamme et commander le débit de carburant d'un brûleur
Publication
Application
Priority
GB 9712447 A 19970613
Abstract (en)
A flame detector comprises a flame rectification effect circuit (8, 9, 1, 2) receiving A.C and which charges a capacitor (10) in the presence of a flame between probes 1. (The flame is modelled (2) as a resistor (R1) and diode (D1). An oscillator (3) is powered solely by the capacitor (11) to produce a waveform indicative of a flame. In absence of a flame the capacitor (10) is not changed and the oscillator (3) is inoperative. The waveform produced by the oscillator (3) is applied to a transistor (4) to maintain a gas control valve open by energising its solenoid (5). <IMAGE>
IPC 1-7
IPC 8 full level
F23N 5/12 (2006.01)
CPC (source: EP)
F23N 5/123 (2013.01)
Citation (search report)
- [X] DE 4027090 A1 19920305 - KROMSCHROEDER AG G [DE]
- [X] US 3853455 A 19741210 - RIORDAN W, et al
- [A] US 4019854 A 19770426 - CARLSON ELMER A, et al
- [A] GB 1509705 A 19780504 - PACTROL CONTROLS LTD
- [A] PATENT ABSTRACTS OF JAPAN vol. 010, no. 275 (E - 438) 18 September 1986 (1986-09-18)
- [A] PATENT ABSTRACTS OF JAPAN vol. 005, no. 097 (M - 075) 24 June 1981 (1981-06-24)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 98304553 A 19980609; GB 9712447 A 19970613