OptoSniff stainless steel gas sensors were installed 5km down a working mine in China for 4 months. One sensor was connected the Central control unit (located in a surface room) via a 10km fibre link & installed at entrance to furthest gas extraction duct. Constant methane readings (5000ppm) were recorded & measurements compared regularly against traditional portable sensors. The sensors continued to accurately read methane levels and suffered minimal contamination and no loss of performance in underground mine environment.
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