We can offer a revised flow sensor in cooperation with Digmesa as of now. This has a modified nozzle with 5.6 mm instead of 3.3 mm. The duct of the sensor is almost identical with that of the tube diameter.
The calibrating value amounts to 256 implulses/l.
The sensor is already in large quantities at the store and the price is identical to the variant with a 3.3 mm nozzle.