Flow meter
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Please info about analog flow meter from reference installation
https://www.unipi.technology/cs/reference/rizeni-sestavy-usporneho-tepelneho-cerpadla-119
for hot watter. Thanks -
As you can see on the very last photo, we used TacoSetter Tronic
http://www.taconova.com/en/products/pv/hydronic-balancing/1/tacosetter-tronic/13/
Output temperature 0,5-3,5V
Output volume flow 0,5-3,5V