FIELD: computer engineering; monitoring devices used in science and technology to determine optimal moments for starting maintenance operations ensuring utmost probability of equipment serviceability by the time of its use. SUBSTANCE: device has time sensor 1, subtracters 2, 4, storage elements 3, 12, exponential conversion units 5,16,17,18, multiplication units 6,7,8,9, adder 10, comparators 11,15, switch 13, flip-flop 14. EFFECT: enlarged functional capabilities due to determining optimal maintenance intervals for making equipment available to perform its functions and, hence, raising probability of its serviceable condition in due time. 2 dwg
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