{"product_id":"trolmaster-wn-9-substrate-sensor-node-vwc-ec-temp","title":"TrolMaster WN-9 Substrate Sensor Node | VWC, EC \u0026 Temp Add-On for WCS-9","description":"\u003ch2\u003eTrolMaster WN-9 Adds Another Root Zone Reading to Your WCS-9\u003c\/h2\u003e\u003cp style=\"text-align: justify;\"\u003eThe WN-9 is the probe half of TrolMaster's WCS-9 substrate sensor system. It measures \u003cstrong\u003evolumetric water content, EC and temperature\u003c\/strong\u003e from one set of stainless steel spikes. The WCS-9 set already includes one node, and this is the part you add to sample more of the room. One WCS-9 display takes up to \u003cstrong\u003efour nodes\u003c\/strong\u003e on a single daisy chain. The display shows each node's reading as well as the average across all of them. Water content reads from \u003cstrong\u003e0 to 100%\u003c\/strong\u003e, and EC reads from \u003cstrong\u003e0 to 30 mS\/cm\u003c\/strong\u003e. TrolMaster says the EC reading accounts for nutrient solution salinity, which keeps both numbers dependable as feed strength changes. The node works in traditional soil and in high bulk-EC soilless media such as rockwool. A 12 ft ECS-7 daisy chain cable comes in the box to link it to the next node or the display. The package measures 6.30 × 3.39 × 3.39 in and weighs 0.66 lbs.\u003c\/p\u003e\u003ch2\u003eWhy a Second Substrate Sensor Node Changes Your Irrigation Data\u003c\/h2\u003e\u003cp style=\"text-align: justify;\"\u003eA single probe only reports the block it sits in. If that block runs wet from channeling or dry from a clogged dripper, the whole room gets watered on bad data. Spreading several nodes across benches gives the controller an average that is harder to fool. That matters most with Feed on Demand, where irrigation is triggered by substrate moisture instead of a timer. Readings refresh every minute and speed up to every 10 seconds during a Feed on Demand event. Setting up a new node is simple: plug it into the chain, then shake it to pair it with the display. Calibration only needs the 100% water content point taken in fully saturated media. The sensor comes pre-calibrated for rockwool, so rockwool growers can often skip that step. Update the controller's firmware before connecting, since older versions do not support the WCS-9. Aqua-X Pro and Hydro-X Pro controllers each take up to 50 displays, while Tent-X and Green-X take one.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\u003cul style=\"text-align: justify;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-in-1 Probe:\u003c\/strong\u003e Water content, EC and root zone temperature come from one node with stainless steel spikes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 4 Nodes per Display:\u003c\/strong\u003e Chain nodes together and the WCS-9 display reports each reading plus the average.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeed on Demand Ready:\u003c\/strong\u003e The data drives sensor-based irrigation, with 10-second updates during a watering event.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Point Calibration:\u003c\/strong\u003e Only the saturated 100% point is needed, and it arrives pre-calibrated for rockwool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShake to Pair:\u003c\/strong\u003e Shaking the node links it to the display, with no extra tools or menu work.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"text-align: justify;\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color:#333; color:#fff;\"\u003e\n\u003cth style=\"padding:8px; text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:8px; text-align:left;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePart number\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eWN-9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eRequires\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eWCS-9 Substrate Sensor Display (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMeasurements\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eVolumetric water content, EC, temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eWater content range\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0–100%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eEC range\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0–30 mS\/cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eTemperature range\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e32–122°F (0–50°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eUpdate interval\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eEvery 1 min; every 10 sec in Feed on Demand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eNodes per display\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUp to 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eDisplays per controller\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eNFS-2 \/ HCS-2: 50; NFS-3: 20; NFS-1 \/ TCS-1 \/ GCS-1: 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOperating humidity\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e≤90% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePackage contents\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1 × WN-9 sensor node, 1 × ECS-7 12 ft daisy chain cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePackage dimensions\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e6.30 × 3.39 × 3.39 in (160 × 86 × 86 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eGross weight\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0.66 lbs (0.30 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TrolMaster","offers":[{"title":"Default Title","offer_id":50527962136790,"sku":"WN-9","price":113.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0723\/9450\/6454\/files\/trolmaster-wn-9-main-v1.webp?v=1790264231","url":"https:\/\/growershouse.com\/products\/trolmaster-wn-9-substrate-sensor-node-vwc-ec-temp","provider":"GrowersHouse","version":"1.0","type":"link"}