焰探测器与西门子燃烧控制器配合使用，用于燃气或燃油火焰的监测。

• 火焰探测器用于监测燃气火焰、黄色或蓝色燃油燃烧火焰以及点火火花的校对。
• 这种类型的火焰探测器监测燃气或燃油火焰放出的 UV 辐射产生的火焰信号。
• 辐射探测器是一个带 2 个电极的 UV 光电管，当它被光谱中 190...270 nm 范围的光照射
• 时便会点燃，从而启动火焰探测器电路内的电流。
• UV 不会对燃烧室内灼热的耐火砖,日光或照明光线产生反应。

火焰探测器QRA4.U为铝制外壳，带有3/4“-14NPSM内螺纹，用于将火焰探测器安装到燃烧器或者锅炉上。连接线大约1.8m。电气连接端为1/2”-14NPSM内螺纹，同时需要一个电线保护套管。

The flame detectors are used for the supervision of gas flames, yellow- or blue-burning oil flames and for ignition spark proving.

• With this type of flame supervision, the UV radiation emitted by gas or oil flames is used to generate the flame signal.
• The radiation detector consists of a UV-sensitive cell with 2 electrodes, which ignite when illuminated with radiation in the 190...270 nm range of the spectrum, thereby triggering a current in the flame detector circuit.
• The UV cell does not respond to glowing firebrick in the combustion chamber, daylight or light from the boiler room illumination.