2 barns, 10,000+ in each... yes it does keep me a "tad" busy ...
As to the sensor, I have checked it with various flow rates and it is accurate
That's fantastic news, so glad the sensor is doing what you need it to. My wife and I fondly remember your part of the world, 13 wineries in one day over in McLaren Vale (hic!), a visit to the Lothlorien B&B over on Kangaroo island, among other activities. Beautiful part of the world.
I use a somewhat bigger water meter, a DLJ-100
because I was trying to keep flow restrictions to a minimum (this is off a cistern pump) and because flow rates can be in excess of 15GPM ~ 50l/min. The large vanes of the meter also have a hard time getting clogged with the minute amount of gunk that the pump does pass.
Some day when I have too much time, I'll bore the lot of you on how I built a filtration / backwash system with an Arduino controller to keep our drip irrigation system clear of clogging debris. Being the cheapie I am, I enjoyed fabricating all the PVC pipe / filters / etc. for a fraction of the cost that commercial systems retail for. Better yet, the pressure drop through the system is minimal, so the variable-speed SQE pump from Grundfos is happy. Now I only wash the filters once a year, when the season is over and I retire the filtration system from the outdoors to the shop. Plants are happy, wife is happy, so I am happy.