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| 西門子QRA50M系列火焰探測器-電眼 |
| QRA50M系列火焰探測器-電眼
品牌：SIEMENS（西門子）
產地：德國 |
| 產品介紹 |
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The flame detectors are used for the supervision of gas flames, yellow- or blue-burning oil flames and for ignition spark proving. High sensitivity.
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With this type of flame supervision, the UV radiation emitted by gas or oil flames is used to generate the flame signal.
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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.
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The UV cell does not respond to glowing firebrick in the combustion chamber, daylight or light from the boiler room illumination.
The die-cast alloy flame detector head is sealed with a quartz-glass lens. In addition to the plug-in UV cell, the head contains a rotating shutter which – for the purpose of continuous testing of the UV cell’s striking and extinction voltage performance – interrupts the UV radiation at the rate of 3 times per second. The shutter is driven by a synchronous motor which is suited for continuous operation.
The flame detector is attached to the viewing tube by means of a flanged mounting coupling which has a 1 in. internal thread. A 3/8 in. tapping on the side of the coupling enables a cooling air conduit to be connected, provided that dry, dust- and oil-free compressed air is available. | |
| 技術參數 |
| 主要參數 |
| UV單元平均壽命 |
10000小時（在50ºC） |
| 爐膛背壓 |
500mbar最大 |
| 保護等級 |
IP54 |
| 重量 |
750g | | |
| 環境條件 |
| 運輸環境 |
IEC 60 721-3-2 |
| 內部條件 |
class 2K2 |
| 機械條件 |
class 2M2 |
| 溫度范圍 |
-55...+50ºC |
| 濕度 |
<95% |
| 運行環境 |
IEC 60 721-3-3 |
| 內部條件 |
class 3K5 |
| 機械條件 |
class 3M2 |
| 溫度范圍 |
-20...+50ºC |
| 濕度 |
<95% |
| 不得進水 | | | |
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