This sensor plugs into your FMM 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 on any type of reservoir that has up to 1/4" thick walls.
Note: FMM Module required for use.
1x OS-1 Optical Sensor with nut and washer
1x OS-M Optical Sensor Magnetic Mount
Im used these as fail safes for high and low level water alerts in my sump and RODI storage container.I run my ato straight from my ro container in the garage and i just wanted to assure that if ever water in the container is low probably due to mixing the ato would shut off until the water level raises above the sensor.