S10 and S17 Sulfide Analytical Sensors (photo) provide accurate, reliable analysis of sulfide levels in water-treatment, sewage and wastewater-treatment applications. The S10 Sensor is an immersion- or insertion-style sensor, while the S17 is a valve-retractable-style sensor. Both feature a 316 stainless-steel body that incorporates the sensing element, a temperature module and a signal conditioner with cabling. The sensors’ pIon electrode cartridge measures the activity of “free” sulfide ions in solution in concentrations from 0.01 to 32,000 ppm over a pH range of 11 to 14. The electrode cartridge can measure sulfide ions across a temperature range of 0 to 80ºC. The S10 immersion sensor is designed to allow a variable insertion length to accommodate installation in pipe tees, flow cells or through tank walls. The S17 retractable sensor is designed with a ball valve and a compression fitting that allows it to slide freely for insertion into the process or retraction from the process. — Electrochemical Devices Inc., Irvine, Calif.