All-In-One Sulphide Analyser Helps Control Odour, Protects Equipment and Cuts Maintenance Costs

With its breakthrough all-in-one design the new SMS-22 Sulphide Ion Measurement System from Electro-Chemical Devices, Inc., (USA) can be quickly installed with no special tools, featuring user-selectable automated sequential sampling of sulphide ions in water and lowers plant technician and supply maintenance costs.

Hydrogen sulphide (H₂S) is a gas that dissolves in water and gives it a “rotten egg” odour. H₂S is present in well water, municipal wastewater and wastewater produced by refineries, tanneries, chemical plants, and paper and pulp facilities. It is typically formed in environments prone to the creation of septic conditions. In addition to odours, excessive concentrations of H₂S in wastewater can lead to corrosion and structural damage to municipal water/waste infrastructure including equipment and piping.

The SMS-22 Sulphide Measurement System saves time and labour costs for municipal water operations by completing all the necessary steps to measure sulphide ions in a water sample. Because sulphide ions only exist at high pH values, this is a multi-step process. The SMS-22 conditions the sample, measures the sulphide, neutralises the sample, measures the pH and drains and rinses the cell. After measurement, the highly caustic sample pH is reduced to a safe level near pH 8.

The Electro-Chemical Devices SMS-22 is a sequential sampling analyser. Featuring automated sequential sampling, the Model C-22 Analyser controls the sequential sampling with a combination of relays and timers. Sampling times are easily adjustable from 2 samples per hour to 10 samples per hour, and this economical system offers very low reagent consumption.

The SMS-22 Sulphide Ion Measurement System uses a sulphide ion selective electrode (ISE) to measure the total amount of sulphide present in the sample. ISE-based S^-2 measurement provides a wide measurement ranges of 0 to 5 ppm and up to 500 ppm using economical, easily replaceable electrode cartridges. It features a measuring temperature range of -5 to 50°C (20° to 120°F), accuracy to ± 20 ppb or 5 percent of reading, whichever is greater, and repeatability of ± 2 percent of reading.

Easy to install and maintain, the SMS-22 features 4-20 mA outputs that display the total sulphide as well as the neutralised pH value. The output values are captured in the measurement cycle and displayed until the next measurement cycle. The rugged enclosure provides IP66 protection and is rated NEMA 4X. The base is made of gray hot-molded fiberglass-reinforced polyester and the cover is made of transparent polycarbonate with non-metallic hinges.