- 2" Flow Sensor FS200 - Neptune Systems
Know Your Flow!
2" Flow Sensor for the Fluid Metering Module from Neptune.
The FS-200 will work with flow rates from 300-3000 gph, and will connect to any standard 2" Slip PVC.
Usually used with a return pump, this flow sensor can be placed in line with the flow on any pipe, connected to the FMM, and communicate to your Apex the flow rate of water through that pipe. The flow sensor itself uses British Standard Parallel Pipe (BSPP) threads so for all BRS customers we have included two specially designed PVC unions with slip fittings to adapt it to standard 2″ PVC plumbing.
1x 2" Flow Sensor
2x BSPP x 2" Slip Unions
My one year Review By Terry on 5/7/2019Terry wouldn't recommend this product to a friendAfter running this monster for a year it is time for it to go. Why you might Ask? 1) It restricts flow too much. 2) I am replacing my Dolphin Ampmaster 4750Gph pump. 3) Non-standard threads BSP makes it almost impossible to replace the unions without buying them from Neptune. 4) It takes up a lot of space. 5) Did I say flow-loss my 4750GPH pump was reporting a average of 1200GPH.
So Sorry but the AMPMaster is going away and so is this stupid sensor. DON'T do it...NOT WORTH IT.
Didnt work... reduced flow By Steve on 2/12/2019Steve wouldn't recommend this product to a friendDidnt work out of box...
Theres a huge fan and fan cross members inside meter... this is a huge flow restriction by itself... that's why when you hook up a huge pump to it, it says low numbers of flow... if you think a elbow restrists flow... this does even more! And mine was broke from the minute it arrived... and Neptune wants you to take their stuff apart... really??? I paid for a working unit ..didnt I??
Non-standard plumbing/inaccurate flow report By mav1ms on 8/11/2018mav1ms wouldn't recommend this product to a friendI wanted to upgrade my return line to a larger pipe diameter; however due to the BSPP slip union and the inability to purchase those particular unions I have no option but to either repurchase the whole flow sensor or come up with some other solution. Also make sure to use thread sealer if you do use the unions per the instructions. Lastly the sensor has never reported accurate flow. I have had two different pumps. The weaker of the two pumps will report 1100gph, the other which is more powerful reports only 572 gph, no matter how I change the flow (it will report a lower flow).
Yikes this is a monster part. By Trickman2 on 5/17/2018Trickman2 would recommend this product to a friendHUGE HUGE and did I say it Huge. I got it installed but didn't realize it wasn't pre-sealed until I turned the pump on. Lot's of Teflon tape later it was good to go. Just make sure you get some Teflon tape and seal the threads. This thing is just massive so you better have lot's of space.
Now I know. By Vincent on 4/24/2018Vincent would recommend this product to a friendThanks to this flow sensor. I now know how much flow my main pump is giving.
It Works - Difficult Installation By BigHildy53 on 3/25/2018BigHildy53 would recommend this product to a friendI purchased this for my 1'' return line. I purchased the 2'' flow sensor based on a recommendation on a reef forum (but I won't go into that). It is reporting what appears to be accurate numbers based on the head height and usage of a manifold. I had a very difficult time stopping leaks. Had to use plumbers tape and strap wrenches to screw the BRS supplied unions to the APEX flow sensor to get things tight enough to stop the leaking.
Are you going to sell just the monitor without the unions?
We aren't aware of any plans from Neptune to sell the FMM meters without the unions included, but you certainly can install them without if you prefer.
Have a great day!
My tank and external pump both use 1.25" plumbing. Would I be able to use the 2" FS-200 or would I be better off using the smaller 1" FS-100 assuming that I had the right plumbing adapters? Also, can this sensor be plumbed on the suction side of an external return pump (i.e. between the sump and the external pump intake), or does it need to go after the return pump?
To eliminate the possibility of creating a choke point and restricting flow through the sensor, I would suggest upsizing to the 2" sensor. The actual volume of water moving through the sensor is what matters, so going slightly large won't be a problem. In theory, you can locate the sensor any where in the circuit of flow as the amount of water movement should be constant, so intake or output shouldn't matter, so long as the intake is not restricted, which could cause cavitation.
Have a great day!