Conductivity Sensors & Transmitters

Conductivity Sensors & Transmitters

Conductivity measurement systems quantify the ionic content of a liquid by measuring its ability to conduct current, producing a direct indicator of dissolved salts, acids, bases, and other charged species. Sensors and transmitters work together to deliver compensated conductivity and, where needed, derived values such as concentration, resistivity, salinity, or total dissolved solids correlations. This measurement is foundational in water treatment and in many chemical and hygienic processes.

The benefit is immediate, reagent-free insight into water quality and process concentration. Conductivity is widely used to verify rinse end points, detect contamination, control regeneration and blending, and monitor product strength where a stable correlation exists. Fast response enables tight control loops that reduce chemical use, water consumption, and off-spec production.

Sensor selection is typically based on range, fouling potential, and installation constraints. Contacting (electrolytic) sensors use defined cell constants and are suited to low to moderate conductivity, including high-purity water measurement when paired with appropriate design. Inductive (toroidal) sensors avoid direct electrode contact and perform well in high conductivity, viscous, or coating-prone services such as brines, acids, and slurries.

Transmitters provide temperature compensation (often to 25°C), linearization, and concentration tables tailored to specific chemistries. Diagnostics can include sensor health indicators, polarization detection, and calibration tracking to maintain confidence over long service intervals. Installation details - flow velocity, air bubble avoidance, grounding, and material compatibility - strongly influence stability and maintenance frequency.

Typical applications include reverse osmosis and deionization monitoring, boiler makeup and condensate polishing, CIP/SIP control in hygienic industries, chemical dosing and blending, and seawater/brine processes. Conductivity also supports environmental compliance by indicating salinity changes and contamination events. With correct cell constant selection and disciplined calibration practices, conductivity measurement remains one of the most reliable and cost-effective analytical signals available.

Instrumentation and Controls., an exclusive authorized representative of sales and service for Endress+Hauser.