Brand: Japan FIGARO. The KE series oxygen sensor (KE-12/KE-25/KE-50) is a unique galvanic cell type oxygen sensor successfully developed in Japan in 1985. Its notable features include a long service life, excellent chemical stability, and resistance to interference and influence from CO2. The KE series sensors were developed to meet the growing demand for oxygen detection across various industries, such as combustible gas detection, biotechnology applications, medical device applications, residential gas appliances, etc.