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Neptune Systems

1" Flow Sensor FS100 - Neptune Systems

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Know Your Flow!

1" Flow Sensor for the Fluid Metering Module from Neptune. 

The FS-100 will work with flow rates from 150-1500 gph, and will connect to any standard 1" 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 all BRS customers we have included two specially designed PVC unions with slip fittings to adapt it to standard 1″ PVC plumbing.


What's Included?

1x 1" Flow Sensor

2x BSPP x 1" Slip Unions


More Information
Product Name 1" Flow Sensor FS100 - Neptune Systems
SKU 210686
UPC 019962172557
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Product Questions

What is the length of this unit with the unions installed?
Question by: John Flagg on Feb 23, 2017, 6:13 AM
Hey John,
The 1" flow monitor measures 4 1/4" and has a cord length of 16'. If you have any other questions, let us know!
Answer by: Jason Smith on Feb 23, 2017, 7:40 PM
The easiest place for me to add this would be at the end of my submerged return pump. Can you submerge the whole thing? Is it water proof or is it just water resistant?
Question by: Kevin on Oct 23, 2017, 7:59 PM
Hi Kevin, great question!

Do not submerge the FS100 flow sensor as it is not waterproof. According to the manufacturer, you should orient the sensor so that the point where the cable enters the body of the flow sensor is pointing down if possible. This will provide the best resistance to splashes and drips.

Please refer to Neptune's Flow Sensor installation guide for full list of tips and recommendations.
Answer by: Nick on Nov 10, 2017, 7:15 PM
Does BRS plan to stock replacement BSPT fittings for these? Can't find unions anywhere for less than $45 for a 1". And the BSPT fittings are not widely available..
Question by: Elisabeth Duarte on Mar 6, 2017, 3:45 AM
Hey there,
If Neptune offers a fittings kit, we would most likely carry this, but currently I don't have any info indicating we would be carrying BSPT fittings or unions outside of this. That said, I'm happy to bring this up with our product team to evaluate whether this is something we should start bringing in!

Have a great day!
Answer by: Zack on Mar 9, 2017, 7:36 PM
Can the 16' cord length be extended?
Question by: Marty on Nov 23, 2017, 2:26 PM
You could use a standard 1/4" headphone extension cable but you will want to make sure that it has the three black rings. Standard headphone jacks only have two rings, and the Neptune flow sensors do require the third ring for additional data to be sent.
Answer by: Charlie on Nov 24, 2017, 4:31 PM