The TrolMaster WN9 Substrate Sensor Node is the dedicated sensing probe designed for use with the TrolMaster WCS-9 Substrate Sensor System. Engineered for professional cultivation environments, the WN-9 delivers highly accurate measurements of Volumetric Water Content (VWC), Electrical Conductivity (EC) and root zone temperature, helping growers make better irrigation decisions and implement advanced crop steering strategies. Whether you're growing in Rockwool, coco, soil or other high-EC substrates, the WN-9 continuously monitors root zone conditions and feeds real-time data back to the WCS-9 Display for analysis, averaging and Feed On Demand irrigation control. ⚠️ Important Compatibility Information The WN-9 is NOT a standalone sensor. This product is an expansion Sensor Node designed exclusively for use with the TrolMaster WCS-9 Substrate Sensor System. To operate, this Sensor Node must be connected to a WCS-9 Display. If you do not already own a WCS-9 Display, you will need the complete WCS-9 Starter Kit. 📦 What's Included In This Listing? 1 × TrolMaster WN-9 Sensor Node 1 × ECS-7 12ft Daisy Chain Cable Important: WCS-9 Sensor Display is required (as well as a compatible controller) What Does The WN-9 Sensor Node Do? The WN-9 is the measurement probe used within the WCS-9 ecosystem. Installed directly into the growing media, it continuously captures root zone data and transmits readings back to the WCS-9 Display. Each Sensor Node measures: Volumetric Water Content (VWC) Substrate EC Root Zone Temperature By collecting accurate root zone information, growers can make more informed irrigation decisions, monitor dry-backs and optimise plant performance throughout the entire crop cycle. Expand Your WCS-9 Monitoring System One of the biggest advantages of the WCS-9 platform is its multi-node architecture. Traditional substrate sensors only monitor a single location, which can often provide misleading information due to localised dry spots, irrigation channeling or nutrient hotspots. The WN-9 allows growers to place multiple sensors throughout the crop, providing a much more representative picture of root zone conditions. Up to 4 WN-9 Sensor Nodes can be connected to a single WCS-9 Display. Sensor Nodes connect together using TrolMaster ECS-7 Daisy Chain Cables. The WCS-9 Display automatically calculates average values across all connected nodes. Individual node readings can also be viewed separately. This makes the system ideal for larger irrigation zones, multiple slabs, larger Rockwool blocks and commercial cultivation facilities. Precision Root Zone Monitoring Each WN-9 Sensor Node uses durable stainless steel sensing spikes to continuously measure moisture and EC levels within the substrate. An integrated temperature sensor is built directly into the probe, providing accurate root zone temperature monitoring alongside moisture and nutrient concentration data. The result is verified root zone data that can be used to improve irrigation timing, monitor crop steering targets and optimise substrate performance. Ideal For Feed On Demand Irrigation The WN-9 plays a critical role within TrolMaster's Feed On Demand irrigation strategy. By providing live substrate moisture data, the sensor enables the WCS-9 and compatible TrolMaster controllers to automatically trigger irrigation events based on actual substrate conditions rather than relying solely on timers. This allows growers to: Improve irrigation precision. Achieve more consistent dry-backs. Reduce overwatering. Implement advanced crop steering strategies. Respond dynamically to changing plant demand. Scale Your System As You Grow The WN-9 has been designed with expansion in mind. Additional Sensor Nodes can be added to existing WCS-9 installations as your facility grows, providing extra monitoring points without requiring a complete system replacement. For larger installations, multiple WCS-9 Displays can be integrated into compatible TrolMaster systems using the TrolMaster Hub, allowing even greater monitoring capacity across multiple rooms and irrigation zones. TrolMaster WN-9 Features Designed exclusively for the WCS-9 monitoring platform. Measures VWC, EC and root zone temperature. Suitable for soil, coco, Rockwool and high-EC substrates. Professional-grade stainless steel sensing probes. Supports advanced crop steering strategies. Feed On Demand irrigation compatible. Daisy-chain expandable architecture. Includes ECS-7 12ft connection cable. Accurate root zone monitoring. Commercial cultivation ready. Technical Specifications Specification Value Product Type Substrate Sensor Node Measurements VWC, EC & Temperature Power Input 5V DC 0.1A Operating Temperature 0-50°C (32-122°F) Operating Humidity ≤90% RH Measurement Interval Every 1 Minute Maximum Nodes Per Display 4 Frequently Asked Questions Can I use the WN-9 without a WCS-9 Display? No. The WN-9 is a Sensor Node only and requires a WCS-9 Display to operate. How many WN-9 sensors can I connect? Each WCS-9 Display supports up to 4 WN-9 Sensor Nodes. Does this include the cable? Yes. This listing includes one ECS-7 12ft Daisy Chain Cable. Can I monitor multiple pots or slabs? Yes. Multiple WN-9 Sensor Nodes can be installed throughout your crop and averaged by the WCS-9 system for more representative root zone monitoring. What growing media is the WN-9 suitable for? The WN-9 is suitable for Rockwool, coco, soil and other high-EC soilless growing media.
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