Engineers and technicians looking for a flexible, cost-effective solution to monitoring sour water containing Hydrogen Sulfide (H2S) compounds in oil/gas refineries will find the sulfide-resistant Models S10 and S17 Analytical pH Sensors from Electro-Chemical Devices (ECD) help them keep their processes and plants running efficiently. Petroleum refiners must take care to monitor and treat naturally occurring H2S that contaminates water in their operations to meet regulatory limits. Removing H2S from the water is done through air stripping that eliminates the sulfur or oxidation reactions that convert the sulfides to sulfates. Once the water has been stripped of the sulfides it can be used in other refinery operations or be further treated as wastewater. Stripping is essential due to both the toxic environmental and corrosive effects on equipment of sulfides, which are also a common sensor poison. ECD’s S10 and S17 pH Sensor product family monitor pH in water-based solutions. The S10 and S17’s Model 20005130 replaceable cartridge electrode features a pH range of 0 to 14 at temperatures from -5 to 130 C and survives pressures up to 300 psi at 25?C. It has been tested to sulfide ion concentrations of up to 25 ppm. The S10 and S17 product line consists of two unique sensor designs and replaceable electrode cartridges. The S10 Sensor is an immersion or an insertion style sensor, and the S17 is a valve retractable style sensor. They are fully re-buildable and feature a 316 stainless steel body that incorporates the sensing cartridge, a temperature module and a signal conditioner with cabling. These cartridges provide specific solutions for the measurement of pH, ORP, specific ion (pION), dissolved oxygen, conductivity and resistivity in a wide range of industrial process applications.