The Hach ORBISPHERE 51x controller using ORBISPHERE thermal conductivity sensors provides precise, selective and reliable measurements of H2. This system is designed for process monitoring in liquid or gas phases across a wide range of applications from beverage production to rinsing semiconductor wafers in chip-manufacturing plants. The user interface is a large colour touch screen with intuitive software allowing easy configuration of the instrument set-up for process parameters and alarms. The main measurement window continuously displays real time process readings, graphed sensor trends, alarm limits, temperature and event occurrence.