https://www.powtech.de/en/ausstellerprodukte/powtec23/product-10326748/flowjam-t-material-flow-monitoring

FlowJam T is a sensor that has been specially developed for monitoring the flow of solids that are conveyed through thin pipelines. The sensor can be used for tubes made of electrically non-conductive material, such as plastic or rubber, with outside diameters between 4 and 25 mm. The sensor is mounted around the tube for measurement.

https://www.envea.global/s/process/flow-detection/flowjam-t/

ENVEA is a world-class manufacturer of ambient, emission and process monitoring systems, with full turnkey capabilities. ENVEA’s equipment and technologies encompass gas analyzers, dust monitors, solids, and flue gas flow meters, as well as environmental data processing and reporting solutions.

Process is a business unit of ENVEA, focused on solutions for the process optimization. ENVEA develops and produces measuring systems for the solid measurement of powder, dust and granulate, such as mass flow measurement, material flow monitoring, moisture measurement or dust measurement. Our solutions help to optimize processes and contribute to increase efficiency in production and as a result, downtimes and material losses can be reduced.