Monitor Your RO/DI Water Quality in Real Time The HYDROS Dual Inline TDS Sensor uses two corrosion-resistant titanium sensors to monitor the water quality of any RO/DI system, providing years of trouble-free readouts. The compact display mounts right at your filtration so you can check your total dissolved solids (TDS) at a glance and know exactly when it is time to change your membrane or DI resin. Pair it with a HYDROS controller to log readings and get alerts through the HYDROS automation system. Requires a HYDROS Control with an available Sense Port, such as the HYDROS Start (sold separately). The sensor plugs directly into a Sense Port and draws power from the Control, so no separate power supply is needed. Key Features Two high-quality titanium sensors that resist corrosion for reliable, long-lasting readings. Dual inline design lets you monitor water quality before and after your RO/DI system to measure filter performance. Compact magnet-mount display for an at-a-glance TDS reading right at your filtration. Simple installation with included 1/4 inch push-connect fittings. Plugs into any HYDROS Sense Port and needs no separate power supply. Specifications Specification Detail Sensors 2 x corrosion-resistant titanium Range 0 to 999 ppm Resolution 1 ppm Accuracy +/- 2% Sensor cable length 24 in Display cable length 13 ft Sensor size 2 x 0.6 in (diameter x thickness) Fittings 1/4 in push-connect (included) Connection Plugs into a HYDROS Control Sense Port (no separate power) Why Monitor TDS? Total dissolved solids (TDS) tell you how pure your source water is. Reef keepers and planted-tank aquarists rely on clean RO/DI water to avoid nuisance algae and unwanted elements. By reading TDS on both sides of your system, you can see when your RO membrane or DI resin is wearing out and replace it before impure water reaches your tank. Complete Your HYDROS System HYDROS Start, a beginner-friendly controller with four Sense Ports for this sensor. HYDROS Control XP8 Energy Bar for smart, individually controlled outlets. HYDROS Salinity Probe Kit to monitor salinity on marine tanks. HYDROS Triple Optical Water Level Sensor for automatic top-off. Browse all water testing and controllers and automation. Frequently Asked Questions Do I need a HYDROS controller to use this?Yes. The sensor draws its power from a HYDROS Control Sense Port, so you need a HYDROS Control such as the HYDROS Start. It does not run on its own. Can I use it on both fresh and salt water systems?Yes. TDS monitoring applies to any RO/DI system, whether you are making water for a reef tank or a planted freshwater tank. What do the two sensors measure?The dual inline design lets you read TDS before and after your RO/DI unit, so you can see how well your membrane and resin are removing dissolved solids. How do I install it?The sensor uses standard 1/4 inch push-connect fittings (included) that tie into your RO/DI tubing, then plugs into an open Sense Port on your HYDROS Control.
