flow sensor

I just setup a new collective on a group of tanks - first time using the flow meters and they are all reading 0. I confirmed the flow direction on all the circuits and the flow rates should be more than sufficient (Varios 8 at 100% with flow meter 4 feet away from pump. I have swapped sense...

I'm running 4 flow sensors. Two 3/4 in (HDRS-FM075) and two 1 inch (HDRS-FM100). In all cases, the measured flow seems about 1/3 to 1/5 of the flow that I'd expect. One 3/4" is connected to a Jebao DCP-10000 - Max 2600GPH This one shows 530 GPH at full power in a short closed loop. It is...

Ok I made a mistake with my new build. I think I mixed up plumbing pieces and my union is leaking on one end of the flow sensor. I think half is a generic BRS union and the other half is the one that came with the 1 inch flow sensor. Any ideas how to fix it or to get a new union for the flow...