NeverDie said:I wonder, then, if it only works on certain types/brands of water meters?
RAL said:Here's a nice video that shows how a utility type water meter works.
NeverDie said:Thanks! That was interesting. So, apparently the meter dial is magnetically coupled to the positive displacement disk. So, I'm guessing they're detecting changing magnetic flux lines as that coupling magnet spins?
NeverDie said:I guess I'll have to wait for the low power waterproof version, as my meter is down at the curb.
There are ultrasonic flow meters you can mount outside a pipe, but I don't know how accurate they are, especially at low flow rates.