公开(公告)号：US3740574A

公开(公告)日：1973-06-19

申请号：US3740574D

申请日：1971-12-30

Applicant: COMBUSTION ENG

Inventor： TAYLOR J

IPC: F23N5/12 ,  F23N5/24 ,  G01N27/62 ,  G08B21/00

CPC classification number: F23N5/123 ,  Y10T307/773

Abstract: A protection circuit for an ionic flame monitor to insure that high voltage AC signals appearing across the flame electrodes and arising from sources other than a flame will not be effective to provide a false output indication of flame presence. The flame monitor is sensitive to AC signals above a certain frequency or above a certain voltage to indicate flame presence. Non-flame AC signals having voltages above or below the certain frequency, but above the certain voltage are prevented from indicating flame presence if their voltage is above a second certain level which is above that of most flame signal voltages. A voltage level detection circuit clamps the monitor output circuitry to a ''''no-flame'''' condition whenever the AC signal voltage is above the second certain level.

Abstract translation: 用于离子火焰监测器的保护电路，以确保出现在火焰电极之间并由火焰以外的源产生的高电压AC信号将不能有效地提供火焰存在的错误输出指示。 火焰监视器对高于某一频率或高于某一电压的交流信号敏感，以指示火焰存在。 如果其电压高于大多数火焰信号电压的第二特定水平，则具有高于或低于特定频率但高于某一电压的电压的非火焰AC信号被防止指示火焰存在。