Apex FMM Optical Level Sensor OS-1 – Neptune Systems

Product details

Apex FMM Optical Level Sensor OS-1 – Neptune Systems is a replacement optical sensor designed to plug into the Apex FMM (Fluid Monitoring Module). It uses reflected infrared light to detect whether a monitored area is wet or dry, then signals the Apex controller when the sensor state changes. This makes it useful for custom level and status monitoring tasks around an aquarium setup—such as building an auto-top-off (ATO) trigger, adding high-level warnings in a sump, or monitoring water storage levels.

Features:

• Detects wet-to-dry and dry-to-wet transitions using reflected infrared light
• Connects to your Apex system through the FMM Fluid Monitoring Module
• Supports DIY applications like custom ATO logic
• Works as a high-level warning sensor in sumps or other tanks
• Can help monitor water level changes in storage containers
• Mounts into custom brackets or through a hole in the vessel
• Includes a fastening nut and silicone washer for installation
• Sold individually (one sensor per purchase)

Specifications:

• Compatibility: Plugs into the Apex FMM (Fluid Monitoring Module)
• Sensing method: Reflected infrared light
• Detection behavior: Signals when the sensor changes state from wet to dry or dry to wet
• Mounting options: Can be mounted in custom brackets or through a hole in a vessel
• Included mounting parts: Fastening nut and silicone washer
• Quantity: Sensors are sold individually