Neptune Systems

LD-2 Solid Surface Leak Detection Probe

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Be notified if there is ever a leak before it turns into a disaster. Connecting the LD-2 Leak Detector to the FMM module will allow your Apex Controller to notify you if water ever touches the sensor. There are many applications for leak detectors from water on floor warnings, skimmer cup overflows and much more. 

  • Compatible with FMM
  • Weighted to stay flat
  • Can be placed almost anywhere


The LD-2 is a full size leak detection probe that is compatible with the Neptune FMM module only. The full size sensor is great for inside of your stand, on hard floors, ontop of skimmer cups and any other application that a leak, or overflow may cause an issue. If you have carpeting or tight space requirments we suggest using the LD-1 Leak Detector Probe.


Note: The LD-2 will only work with the FMM and cannot be used with the ALD module.


More Information
UPC 019962171956
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Product Questions

Do you have to run a ffm module or can I use this just by plugging it in and setting the sensor under my aquarium stand? I’ve never used a leak detection system before and I don’t run any module on the current set up since it’s fresh water (550g-135g sump) thanks!
Question by: Samantha Stewart on Oct 17, 2022, 2:01 PM
This product does need the FMM.
Answer by: William Reed (BRS Staff) on Nov 2, 2022, 10:32 AM
Will this sensor detect pure RO water overflow?
Question by: Zack on Nov 8, 2017, 8:49 AM
There is always the change in pure water that conductive sensors may not work, but in our experience they normally do. After the water travels down the side of the container and onto the floor, there is a very good chance that it has picked up some conductive materials that will allow the sensor to work.
Answer by: Charlie on Nov 25, 2017, 12:32 PM