The EXA-based GD402/GED40 hydrogen purity monitor is a fast, accurate and reliable process gas measurement device that is unaffected by ambient temperature or vibration and does not require reference gases or a controlled temperature environment. It consists of a gas detector (GD40) and a signal converter (GD402) that fit directly into most generator stations. This monitor’s low maintenance design, self-diagnostic capabilities and easy to use programming provide a broad range of control options to meet the demanding environments of power producers.