Conductivity Sensors & Transmitters

Conductivity Sensors & Transmitters

Conductivity measurement evaluates the ability of a liquid to carry electrical current, which correlates strongly with ionic content. Sensor technologies include contacting (electrode) designs for lower to moderate conductivity and inductive (toroidal) designs for higher conductivity, dirty service, or aggressive chemistries. A transmitter converts raw sensor signals into temperature‑compensated conductivity, resistivity, or concentration values and provides outputs for monitoring and control.

The benefit is simple, continuous insight into concentration and purity. Conductivity is widely used to control chemical dosing, detect contamination, and verify rinse endpoints. In high‑purity applications, resistivity measurement confirms low ionic contamination, supporting product quality and protecting sensitive equipment. Stable conductivity trends also function as an early warning for exchanger leaks, process upsets, and inadequate separation performance.

Applications span boiler and steam cycles, cooling systems, reverse osmosis and deionization trains, chemical concentration control, and CIP rinse verification in hygienic industries. In wastewater treatment, conductivity helps identify saline intrusions, industrial discharges, and blending opportunities. In chemical and mining services, inductive conductivity supports measurement in corrosive acids, caustics, and high‑solids slurries where electrodes would foul or degrade.

Installation and sensor selection drive performance. Contacting sensors require attention to polarization and coating effects, so cell constant selection and cleaning access matter. Inductive sensors avoid direct electrode contact and tolerate coatings better but require minimum pipe fill and careful placement away from strong electromagnetic noise sources. Temperature compensation method selection (linear, ultrapure, or custom curves) should match the process chemistry and reporting needs.

Operational excellence includes periodic validation, cleaning routines appropriate to fouling type, and trend review to catch gradual drift. Transmitters with diagnostics can flag coating, cable issues, and temperature element faults before data quality is compromised. When conductivity is paired with complementary measurements such as pH, ORP, or flow, it becomes a powerful, low‑maintenance signal for mass balance, control, and troubleshooting.

Forberg Smith, an exclusive authorized representative of sales and service for Endress+Hauser.