Microwave Transmission Measurement

Microwave Transmission Measurement

Microwave transmission meters provide continuous inline measurement of total solids (%TS) in mixtures such as sludges and other high-solids slurries. The technology is applied where traditional optical or turbidity-dependent methods struggle, and where laboratory sampling introduces delays that hinder closed-loop control.

Inline total solids measurement improves process efficiency by delivering immediate feedback rather than waiting for lab results. Compared with other approaches that may be limited by turbidity range, media color, or maintenance burden, microwave transmission can be independent of optical properties and is positioned as a low-maintenance solution with a broad usable range up to approximately 0–50% total solids.

The method transmits microwaves through the process stream and evaluates how the signal is altered by the mixture’s composition. Because the interaction is tied to dielectric behavior rather than visible-light scattering, measurement performance can remain stable when color and turbidity fluctuate - an important advantage in sludge and slurry services where optical signals can be ambiguous.

In water and wastewater, key use-cases include clarification, digestion, and dewatering processes, where solids concentration directly influences polymer dosing, centrifuge or belt-press performance, and overall sludge handling costs. Additional applications occur in food & beverage and pulp & paper where solids content defines product quality and process stability in thick, variable mixtures.

Implementation typically involves a robust inline installation (or controlled bypass) and matrix-specific calibration to match the process medium. Once commissioned, continuous solids data can be used to stabilize dewatering, reduce chemical consumption, and provide clearer performance indicators for upstream and downstream unit operations without the time lag inherent to manual sampling.

George E. Booth Co., an exclusive authorized representative of sales and service for Endress+Hauser.