FOR WATER METER FROM 3"
From one water meter company I have got this sample:
The only solution that I can suggest for your problem is:
install an our meter model WDEK30 with impulse device; this impulse device has a electric wire long 3 meters,
at the end of this wire you can link the our impulse counter (if you need more length for the wire, you can add
a normal electric wire).
Our WDEK30 can be equipped with the follow scale impulse:
DN50-65-80-100 = 1impulse for 100 liters
DN125-150-200 = 1impulse for 1000 liters