Assessment of Power Supply Modes for Thermocatalytic Sensors in Explosion Hazard Monitoring Systems of Technogenic Facilities

Abstract:

The objective of this work is a solution search to enhance the accuracy of explosive gas and vapor detection devices within explosion hazard monitoring systems for technogenic environments. The study employs analytical methods for investigating the operation of thermocatalytic sensors under various power supply modes of their sensitive thermoelements, based on classical principles of electrical engineering, thermodynamics, and catalysis, as well as experimental studies of sensor performance under different supply conditions, followed by evaluation and generalization of the theoretical and experimental results. It has been established that when the measuring bridge of thermocatalytic sensors is powered by a constant voltage supply, or under modes with voltage stabilization across the active or reference thermoelement, a stable thermal regime of the active thermoelement is not maintained. This leads to significant measurement errors in determining the concentration of flammable gases or vapors of volatile combustible liquids. Furthermore, under explosive concentrations of combustible components – such as those that may arise during emergency situations – voltage-stabilized power modes across the bridge or reference thermoelement may result in sensor damage due to overheating of the active thermoelement. It is shown that the risk of thermal overloads is eliminated, and minimum measurement errors are achieved when the power supply mode ensures a stable temperature of the active thermoelement. The optimal power supply mode for the thermocatalytic sensor has been substantiated. It is based on stabilizing the resistance of the active thermoelement, which ensures a stable thermal regime of operation, eliminates the risk of thermal overloads, and significantly reduces measurement errors in determining the concentration of combustible components caused by changes in working conditions. For the gas analyzer's that implements a procedure for checking and adjusting the temperature regime of the active thermoelement the operating mode algorithm has been proposed. The studies, that have been conducted, significantly enhances the reliability of explosion hazard monitoring systems at technogenic sites and reduces the risk of hazardous situations caused by leaks of flammable gases and the accumulation of vapors of volatile combustible substances that may lead to explosions.

• Periodical: Advances in Science and Technology (Volume 170)
• Pages: 143-152
• DOI: https://doi.org/10.4028/p-WGBp4U
• Online since: November 2025
• Authors: Vasyl Holinko, Oleg Kuznetsov, Oleksandr Holinko*, Olena Sharovatova
• Keywords: Combustible Gases, Explosion Hazard, Fuel, Monitoring Systems, Sensors

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