The TriGas Monitoring System with Ultima X3 technology from MSA Safety delivers a total safety solution for reliable protection against confined-space oxygen deficiency, hydrogen sulfide leaks and combustible gases. Its three sensors are housed in a rugged NEMA 4X stainless steel enclosure. The system is ideal for areas of wastewater treatment plants that are subject to flooding, such as wet wells. It meets NFPA 820 fire protection in wastewater treatment plants, OSHA 29 CFR Part 1910.148 confined space and ANSI 2117.1-1989 safety requirements. It detects O2 (0 to 25 percent range) and hydrogen sulfide levels in three optional ranges (0 to 10, 0 to 50, and 0 to 100 ppm), while an infrared sensor detects combustible gases including methane at the lower explosive limit range of 0 to 100 percent. 800-672-4678; www.msasafety.com.