Neptune Systems Optical Level Sensor OS-1 for FMM

Item #: 0622


Neptune Systems Optical Level Sensor OS-1 for FMM

This sensor plugs into the Neptune Systems Apex FMM (Flow Monitoring Module) and, using reflected infrared light, will signal your Apex when it changes state from being wet to dry or dry to wet. This sensor can be used for constructing your own ATO (auto-top-off), as a high-level warning sensor in your sump, water storage level sensor, and much more. The sensors can be mounted into custom brackets or through a hole in a vessel. Included are a fastening nut and silicone washer. These sensors are sold individually.


  • Cable length: 10 feet / 3m
  • Hole size: 9/16″ / 15mm

What`s Included?

1x OS-1 Optical Level Water Sensor

NOTE: Neptune Systems Apex Controller and FMM Module required and sold separately.

Manufacturer Info

Neptune Systems Aquarium Supplies
Neptune Systems is one of the world’s leading manufacturers of aquarium controllers. The company was founded in 1995 for the purpose of developing affordable water quality monitoring and control instrumentation. Their engineering team has extensive expertise in computer hardware and software system design as well as a background in water quality analysis. Neptune Systems uses these finely-honed engineering skills to develop innovative monitoring and control solutions for use in reef and fresh water aquariums, aquaculture tanks, hydroponics systems and general laboratory use. Neptune Systems is best known for their AquaController line. The company is known for their innovation and customer centricity.

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