The ST-766SS Series are multi-parameter sensors designed for continuous measurement of various oxidizing species and reducing species in water treatment applications. Each model is identified by its product name ST-766SS followed by a suffix indicating its target analyte, these include the following: FCL (Free Chlorine) / TCL (Total Chlorine) / CLO (Chlorine Dioxide) / Br (Bromine) / NCL (Monochloramine) / PAA (Peracetic Acid) / H2O2 (Hydrogen Peroxide) / SO3 (Sulfite) / O3 (Ozone) and DBNPA (2-2dibromo-3-nitrilopropionamide). Two specialty combination models are also available including TFCL (simultaneous Free & Total Chlorine) and DCL (simultaneous Free Chlorine and Sulfite for Dechlorination).

All models incorporate additional measurements of pH, ORP, Conductivity, and Temperature for comprehensive process monitoring. Among these, pH and temperature are automatically utilized for oxidizer concentration compensation, while ORP serves as a direct indicator of whether the water environment is in an oxidizing or reducing state. Conductivity is included as an auxiliary parameter, eliminating the need for a separate conductivity sensor.

The ST-766SS series sensor offers the newly enhanced Oxi-Logic designed replaceable, front loading reference electrode assembly that has been independently developed by Pyxis Lab eliminating the shortcomings associated with membranes and gel replacement while offering reduced polarization time on startup with an electrode life span potential of up to 2-years. The flat front-end design of the ST-766SS makes this platform less prone to contamination or fouling and is easy to clean, while the quick engage pin design prevents any potential for water ingress or internal wiring damage during replacement.

Each sensor eliminates the drawbacks of membranes and liquid reagents, providing fast startup, reduced maintenance, and extended electrode life of up to 2 years. The replaceable dual-gold electrode head assembly (EH-766 Series) and flat, front-end design resist fouling, while pairing with a variety of flow assembly design options, ensures consistent performance across clean to heavily contaminated water applications. The rugged 316 stainless steel body withstands aggressive industrial environments, while built-in 2x 4–20mA and RS-485 Modbus outputs plus Bluetooth® 5.0 (with MA-CR or PowerPACK adapters) enable flexible integration and easy field diagnostics through the uPyxis® app. The ST-766SS Series sets a new benchmark in multi-parameter oxidizer monitoring—field-tough, lab-precise, and comprehensive, covering the widest range of oxidizers available in a single sensor platform.

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