Water Flow meter

gebhardm | Wed, 03/07/2013 - 09:23

The spec states Maximum current:15 mA(DC 5V); Working voltage range:DC 5～18 V, so sadly you cannot use port 6 to provide corresponding power directly from the FLM; so, yes, you would need a tiny 5V power supply - connection to an FLM's puls port then would be "yellow (pulse->+) black (ground->-)"
Rgds, Markus

bazzle | Wed, 03/07/2013 - 19:44

Thanks

Baz

bazzle | Thu, 04/07/2013 - 01:29

Do you think this one may work without an additional power supply?

http://www.ebay.com.au/itm/HQ-678-1-30L-min-G3-4-Water-Heater-Hall-Effec...

mr_thingy | Sun, 07/07/2013 - 11:50

Given the switching parameters in the listing, my guess is that it switches a load on and off. To convert that into a pulse you'd need to drive some sort of circuit from it, which again would need to be powered. I picked up one of these:

http://www.ebay.com/itm/NEW-1-2-Metric-COLD-or-HOT-WATER-METER-MINOL-MIN...

which also has a readout on the meter (both as a backup and to verify that you're getting the digital reading right). Haven't had it put in yet but it's from a large German manufacturer, you can get the data sheets for the meter online.

Water Flow meter

by bazzle on Wed, 03/07/2013 - 04:17