H2S Scrubber Monitoring Systems from MSA Safety provide wastewater treatment plant operators with a tool in their fight against hydrogen sulfide gas odors that are a potential safety hazard and an annoyance to downwind neighbors. They determine the gas levels in scrubber inlets and outlets for optimum removal efficiency, providing gas flow data in the parts per million range up to 500 ppm. Either in-situ type individual sensors can be provided for large-diameter pipes or full sample draw systems are available for applications that require higher detection ranges or greater accuracy. Each type of system has an Ultima X5000 H2S Gas Detector. 800-672-4678; www.msasafety.com