| 摘要 |
heat-power engineering; automation of combustion control and presence of flame in combustion chambers; gas, oil refining and chemical industries; metallurgy and other industries. SUBSTANCE: unit includes photodetector, signal-to-frequency converter, communication line, actuating member, two indicating units, light-emitting diode, electric pulse generator, frequency comparator and time relay. EFFECT: enhanced operational reliability due to check of serviceability of unit both at presence and absence of flame. 1 dwg, 1 ex
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