pH Sensors & Transmitters

pH Sensors & Transmitters

pH sensors and transmitters form one of the most ubiquitous - and most process-critical - measurement loops in industry. The sensor converts hydrogen-ion activity into an electrical signal, while the transmitter applies temperature compensation, diagnostics, and communications. Because pH impacts reaction kinetics, solubility, corrosion, and biological activity, reliable pH measurement is foundational to safe and efficient operation.

This category includes sensor technologies tailored to the application: traditional glass electrodes with diaphragm and reference-system options selected for the matrix, ISFET sensors where glass breakage is intolerable or media contain challenging organic solvents, and enamel sensors where long-term stability and very low maintenance are required. Transmitters scale from basic functionality to multiparameter platforms depending on the measurement architecture.

The benefit of a well-designed pH loop is controllability. Reliable pH feedback improves neutralization performance, stabilizes product quality, and reduces chemical consumption by enabling tighter control bands. High-fidelity pH trending also accelerates troubleshooting during process upsets - especially where excursions create downstream scaling, precipitation, or permit violations.

Typical applications span chemicals, water & wastewater, food & beverage, pharmaceuticals, power plants, mining/metals, and oil & gas - anywhere pH is a control variable, quality attribute, or corrosion driver. The installation context (clean water vs. abrasive slurry, low conductivity vs. solvent exposure) drives sensor selection and maintenance needs.

For designers, success comes from specifying the whole loop: correct sensor type and reference design, appropriate assemblies, and calibration practices matched to criticality. Integrating diagnostics and asset data into maintenance workflows helps prevent “silent failures” from aging references or coated diaphragms - turning pH into a dependable control variable rather than a recurring source of doubt.

Carotek, your trusted Endress+Hauser Representative.