| 摘要 |
PURPOSE:To provide a full small-sized flame sensing device having a simple circuit constitution by a method wherein a presence or non-presence of flame is detected in reference to a variation of resistance value in a winding. CONSTITUTION:In a flame sensor such as a hydrogen flame ionization sensor for a gaschromatography, an ignition circuit is composed of a transformer 3, AC power supply 4 and a switch 5, and a diminished flame sensor circuit is comprised of a source of specified current 9, a potentiometer 11, comparator 12, reed relay 13, Zenor diode 14, capacitor 15, rectifier circuit 16, transformer 17 and AC power supply 18. A change-over switch for connecting either one of the ignition circuit or the diminished flame sensor circuit to the winding 2 is arranged. With this arrangement, it is utilized that its resistance is varied in response to the presence or non-presence of the flame 1 by an ion collector winding 2 and the diminished flame is directly sensed. |
