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Description
Neptune Systems Apex- Flow Monitoring Kit – FMKFlow Monitoring Kit FMK Kit Includes FMM (Fluid Monitoring Module) The FMM (Fluid Monitoring Module) is a module that connects to any Apex (Apex(2016), Apex Classic, Apex Lite, Apex Jr.) via its AquaBus port providing four multi function monitoring ports that can be used for flow sensors, water level sensors, leak detections sensors and possibly future products as well. 1 Flow Sensor (FS 100) This flow sensor connects to the FMM, monitors the flow of
Flow Monitoring Kit – FMKKit Includes
– FMM (Fluid Monitoring Module)
The FMM (Fluid Monitoring Module) is a module that connects to any Apex (Apex(2016), Apex Classic, Apex Lite, Apex Jr.) via it’s AquaBus port providing four multi-function monitoring ports that can be used for flow sensors, water-level sensors, leak detections sensors and possibly future products as well.
– 1″ Flow Sensor (FS-100)
This flow sensor connects to the FMM, monitors the flow of water through the device, and then reports it back to your Apex via the FMM. This sensor is most often used to measure the flow in the main return line of a standard-sized aquarium. The FS-100 will work with flow rates from 150-1500 gph.
– Two 1/2″ Flow Sensors (FS-50)
This flow sensor connects to the FMM, monitors the flow of water through the device, and then reports it back to your Apex via the FMM. Two of these are included in the FMK. These sensors are perfect for attaching to devices such as media reactors, biopellet reactors, etc. The FS-50 will work with flow rates from 30-250 gph.
– Two 1″ Unions
To connect your FS-100 Flow sensor, Neptune Systems has included in the FMK, two 1″ BSPT -> 1″ Slip PVC Unions.
– Two 1/2″ Adapters
To connect your two FS-50 Flow sensors, Neptune Systems has included in the FMK, two 1/2″ BSPT -> 1/2″ Slip PVC Adapters.
Measuring the flow of your aquarium’s main return pump is an incredibly useful piece of information. The key benefit would be to have the Apex notify you the instant the flow stops for any reason — usually the result of a failed or faulty pump. Furthermore, an indication of a reduced flow rate could be used to determine that the pump or the lines are dirty or are becoming clogged with algae, debris, animals, or the growth of organisms inside your plumbing.
Auxiliary pumps on reactors and the like are very handy applications for the FMM. Place a flow sensor on a device like a carbon/gfo reactor and it serves many purposes. First off, you will know if your pump is not on or is faulty. Next, you can easily fine-tune the flow into the reactor by watching the dashboard tile on your Apex. Finally, you can know when the reactor is becoming clogged with detritus or possibly channeling has occurred by an alert on your Apex or by monitoring your dashboard.
Put a flow sensor inline to your device, plug it in to the FMM, and see exactly the flow rate of the water (any aquarium fluid really) going through that sensor. The industrial-grade flow sensors use either a turbine or paddle-wheel mechanism (depending on the model) to measure the flow.
With the FMK – Fluid Monitoring Kit you get one 1″ Flow Sensor and unions as well as two 1/2″ Flow Sensors with adapter fittings.
The FMK comes with three flow sensors but the FMM Module has a total of four ports. This means you have one port free to use for another purpose. Buy an additional flow sensor (sold separately, available also in 2″ and 1/4″ sizes), optical sensor or leak detection sensor and add even more functionality!
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Product Reviews
★★★★★ 5
Great buy
Color: White, Size: Large
Great T-shirt if you want something a little dressier than a regular T-shirt. Nice material and fit. Love the little bit longer sleeve.
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Reviewed in the United States on April 26, 2026
★★★★★ 1
Shrunk from M to XS
Color: White, Size: Medium
Shrunk after one wash and very poor quality.
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Reviewed in the United States on May 19, 2026
★★★★★ 3
Runs big size chart not accurate
Color: Black, Size: Small
I only put three stars because it runs large. Not a true small. I really wish they had xs. It's too big in neck and shoulders bunch up. The fabric is thick and not at all see through. I like the high neck and half sleeves. The fabric feels soft but also kinda "slick" so some people may not like that feel. For reference I'm barely 5ft and 115 and the small is too big. Not sure if I'm going to keep it or send it back. Price point it is a nice shirt
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Reviewed in the United States on April 25, 2026
★★★★★ 5
Comfortable to wear
Color: Black, Size: Large
Comfortable, nice material, looks and feels great. Was thankful that it wasn't overly long. Perfect belly hide but not long
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Reviewed in the United States on April 14, 2026
★★★★★ 2
Not good quality
Color: Hot Pink, Size: Large
They are not good quality.
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Reviewed in the United States on June 1, 2026