Abstract. A methodology designed to determine the reliability of developed flame ion current sensor is presented. The sensor is intended for installations running on organic fuel: piston, rotary internal com-bustion engines; thermal power plants; jet and turbojet engines. The ion current sensor simultaneously measures both positive and negative charged ions at a temperature of 70-125 oC with eight high-voltage probes. Increased requirements for the reliability of components of combustion monitoring systems re-quire an accurate assessment of their reliability and are dictated by safety requirements. In the pro-posed methodology the structural and probabilistic methods for calculating reliability are supplemented by transformations with matrices for modeling computer operating modes. The reliability is calculated with a various number of working probes and different schemes of integer, redundant, sliding, hot, cold and majority redundancy of measuring channels. Such an approach to reliability allows to assess the risks more accurately, select the operating modes of the ion current sensor, and plan maintenance.

Keywords: ion current, sensor, time to failure, reliability, multi-channel circuit, high-voltage probe

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