Hi Maeve, that is quitte challenging. What are the diameters? A quick google-action has led to this company (in Dutch or French) which uses ultrasonic sound to measure flow. Http://intercontrol.eu/industrie-en-procestechniek/doorstroming-en-flowmeting/ Monitoring from a distance is very expensive! Maybe consider a local logger which you can extract the data?

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Hi Maeve, that is quitte challenging. What are the diameters? A quick google-action has led to this company (in Dutch or French) which uses ultrasonic sound to measure flow.

Http://intercontrol.eu/industrie-en-procestechniek/doorstroming-en-flowmeting/

Monitoring from a distance is very expensive! Maybe consider a local logger which you can extract the data?