The Det-Tronics hydrogen sulfide gas detector helps in detecting H2S when in extreme temperatures and humidity applications. This especially when electrochemical sensing technologies are not needed. The NTMOS or NanoTechnology MOS H2S sensor uses the latest nanotechnology. It provides accuracy, reliability, and repeatability. The sensing element is encased in a robust case. It is also covered by a sintered stainless steel flame arrestor. The device may be used in Class I, Division 1 locations. The Det-Tronics hydrogen sulfide gas detector offers more accurate results than the traditional Metal Oxide Sensors (MOS). It can be used as a stand-alone sensor. The device can also work in combination with a display for local indication. It is designed for use in rough conditions and extreme climates. It confirms with ISA-92.0.01 standard.