Product Description: MSA Ultima XA, Ultima XE Gas Detectors MSA Hydrogen Sulfide Gas Detector 2-Wire System 50ppm Working Principle Catalytic Combustion, Electrochemical, and Infrared Gas Detection Technologies Certification Information Ultima XE Gas Detector UL, CSA, CE, ATEX, CCCF, CCS Ultima XA Gas Detector CE NEMA 4X Ultima XIR Gas Detector UL, CSA, CE, ATEX, CCCF, CCS Application Fields: Chemical, Gas Detection, General Industry, Manufacturing, Mining, Agriculture, Hazardous Materials, Oil, Gas, Paper and Pulp, Warehousing Application Scenarios: Flammable Atmospheres, Leak Detection, Oxygen Deficiency, Toxic Gases. Product Information: MSA Ultima X Series Gas Detectors are microprocessor-based transmitters, specifically designed to meet customer needs. The latest mechanical and electronic technologies provide state-of-the-art design for various gas detection requirements. Ultima X Series Gas Detectors.