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GIS Switch Room Online Monitoring Dual SF₆ + O₂ Sensor
SF₆ gas is widely used as an insulating medium and arc-extinguishing gas in power equipment, especially in high-voltage circuit breakers, transformers, mutual inductors, capacitors, lightning arresters, fuses, etc. However, once SF₆ gas leaks, it will lead to a decrease in equipment pressure and insulation capacity; pollute and damage the atmospheric environment, increase the greenhouse effect; accumulate in low-level spaces, causing oxygen deficiency in the brains of workers and even rapid suffocation and other accidents; under the influence of partial discharge, high temperature and other factors, SF₆ gas will also produce highly toxic decomposition products such as SF₄, SF₂, SOF₂, etc.
Our company's infrared SF₆ sensor adopts the NDIR infrared absorption detection principle, determining the concentration of SF₆ gas based on its absorption at 10.5um. It features MEMS light sources, a specially structured optical cavity, and dual-channel detectors to achieve spatial dual-path reference compensation. Meanwhile, a microprocessor is used for signal acquisition, processing, and output. It offers excellent selectivity, high sensitivity, no oxygen dependency, long service life, and low power consumption. It is equipped with an internal temperature sensor for temperature compensation. It also provides output options including UART, PWM, 485, or Modbus (user-selectable) as well as analog voltage output.
The oxygen sensor adopts a solid-state electrochemical principle, featuring low power consumption, high precision, and a service life of up to 5 years. The overall sensor lifespan exceeds 5 years, making it an excellent choice for SF₆ leakage detection.
