FIELD: heat engineering. SUBSTANCE: acoustical wave guide is welded to the house of a heat pipe. A piezoelectric pickup of ultrasonic acoustic noise is secured to cold face of the wave guide. The pickup feds a signal through an amplifier to the instrument for recording the level of intensity of acoustic noise. On onset of anomalous operation condition can be judged by statistically significant exceeding this level above the initial background level. EFFECT: enhanced reliability.
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