Sensors Analyse Sulphide and Hydrogen Sulphide (H2S) Levels in Municipal Water and Waste Treatment Plants

Municipal water engineers and plant technicians treating water for sulphates and hydrogen sulphide (H2S) will find the new S10 and S17 sulphide Sensors from Electro-Chemical Devices (ECD) (USA) provide advanced instrumentation to help plants and processes operate smoothly and efficiently with lower operating costs.

Sulphates and H2S are often present naturally in ground water in areas near oil fields, coal mines, peat deposits and areas where geothermal activity occurs. They give the water a bitter taste and the odor of rotten eggs that if left untreated makes it unsuitable as a source of municipal drinking water. With proper analysis of sulphide levels and treatment, however, the water can then be made available to the public.

ECD’s advanced S10 and S17 sulphide Analytical Sensors provide accurate, reliable analysis of sulphide levels that helps ensure proper water treatment. 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 element, a temperature module and a signal conditioner with cabling.

Sulphides are also commonly present in sewage and wastewater treatment plants. The S10 and S17’s pIon electrode cartridge measures the activity of “free” sulphide ions in solution in concentrations from 0.01 to 32,000 ppm over a pH range from 11-14 pH.The pIon can measure sulphide ions over a wide temperature range of 0 to 80ºC.

Both the S10 and S17 sulphide Sensors utilise ECD’s replaceable electrode cartridges, which can be selected to measure pH, ORP, dissolved oxygen, conductivity and resistivity. These cartridges provide specific solutions for the most demanding measurement requirements, and they are constructed in a variety of configurations and materials to support diverse industries. The application specific sensor cartridges utilise field proven construction materials that are selected for long life and accuracy.

The S10 and S17 Sensors can be integrated with ECD’s C22 Analyser to provide automatic pH compensation for a total sulphide measurement system. The C22 Analyser features ECD’s advanced Multi-Bus architecture. The Multi-Bus design enables customisation of up to four inputs and six outputs in a convenient 1/2 DIN NEMA 4X enclosure. Channel comparisons or measurement compensation, configurable conductivity concentration

curves, the graphical display of data and PID control on the outputs or up to 8 optional SPDT relays are just a few of the powerful features in this easy to use instrument.