I cannot speak to any competitors flow meters, however ours utilize measurement cells based on industrial applications and long standing flow measurement principles - we are pretty happy with them. I personally run one to keep my Reefer 450 running quiet, with a set of media reactors on a manifold.
Here is a E+H video detailing the Vortex Flow Meter principal.
I have one running for 15 months, without cleaning, no noticeable deviation of flow measurement. Of course, occasional cleaning and maintenance will keep the doc away for long time
Regarding the head pressure, I would say it'll add a little bit, but probably not detrimental, of course this is depending on the pump and flow requirements you are looking to satisfy. You can always install the flow meter in bypass mode, and ever use a smaller one.
The controller has capabilities to set bypass, say you break a 2" pipe into 2x 1" pipe, then the 1" / 9000lph meter carries 50% of your flow...
You can connect up to 4 flow sensors to the ProfiLux 4.
2 Sensors would connect to the on-board Level 1/2 port and the other 2 can be connected to an expansion card with LEVEL ports. The expansion card itself can be fitted into the P4 housing, taking up no more space and requiring no extra module.
@Marco@GHLUSA Where did you buy the unions? Finding BSPP fittings here in the US has been a lot harder than I thought it would be. The Neptune flow sensors come with unions. Maybe GHL should do the same thing or at least sell them on your website.
@Ditto will the unions for the 1” Neptune flow sensors work on the GHL flow sensors?