{"product_id":"growlink-terralink-substrate-sensor","title":"Growlink Terralink Substrate Sensor","description":"\u003ch2\u003eReading the Root Zone with the Growlink TerraLINK Substrate Sensor\u003c\/h2\u003e\n\u003cp style=\"text-align: justify;\"\u003eThe \u003cstrong\u003eGrowlink TerraLINK Substrate Sensor\u003c\/strong\u003e reads volumetric water content, bulk EC, and root-zone temperature directly inside coco or rockwool. The probe runs as a TDR substrate probe — \u003cstrong\u003eTime Domain Reflectometry\u003c\/strong\u003e — so EC drift doesn't corrupt the VWC number during aggressive drybacks. \u003cstrong\u003eVWC\u003c\/strong\u003e reads 0.0–1.0 m³\/m³ at \u003cstrong\u003e±0.02 from 0–53%\u003c\/strong\u003e and ±0.04 above. \u003cstrong\u003eBulk EC\u003c\/strong\u003e spans \u003cstrong\u003e0–20,000 µS\/cm\u003c\/strong\u003e at ±(5% + 10 µS\/cm) up to 10,000 µS\/cm. \u003cstrong\u003eTemperature\u003c\/strong\u003e lands inside \u003cstrong\u003e±0.3 °C\u003c\/strong\u003e across the active grow range. Output is \u003cstrong\u003eSDI-12 V1.3\u003c\/strong\u003e on a \u003cstrong\u003e30 ft (9 m) pre-terminated cable\u003c\/strong\u003e, with stainless steel rod sealed in \u003cstrong\u003eIP68 epoxy\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWiring the TerraLINK Substrate Probe Direct to the PIC\u003c\/h2\u003e\n\u003cp style=\"text-align: justify;\"\u003eThis is the PIC-cable variant. The conductors land directly on the Precision Irrigation Controller's screw terminal block, no M8 connector required. Placement is what makes or breaks the read. In rockwool blocks and slabs, slide the rod in 1 inch from the bottom, equidistant between two plants. In 1-gallon coco pots aim for 2 inches up from the bottom. In 2-gallon and larger, 3 inches. If the 30 ft factory cable doesn't reach, splice with 18 AWG 3-conductor cable for the extension. Keep the total run under 175 ft from probe to controller. Growers running Crop Steering Copilot pair this TerraLINK substrate probe with the controller's irrigation logic for shot-by-shot dryback targeting. Avoid mediums mixed with perlite or expanded clay. Air pockets confuse the waveform. Recalibrate the medium profile in Growlink OS when switching between rockwool, coco, and peat blends.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul style=\"text-align: justify;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue TDR Substrate Read:\u003c\/strong\u003e Time Domain Reflectometry keeps the VWC number honest even at high bulk EC and aggressive dryback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVWC ±0.02 Accuracy (0–53%):\u003c\/strong\u003e Tight enough to dial in crop-steering shot volumes through veg, transition, and stretch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk EC 0–20,000 µS\/cm:\u003c\/strong\u003e Reads the full feed range — ±(5% + 10 µS\/cm) up to 10,000 µS\/cm, ±8% above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30 ft (9 m) Pre-Terminated Cable:\u003c\/strong\u003e Wires straight to the Precision Irrigation Controller's screw terminal block — no M8, no adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtendable to 175 ft Total Run:\u003c\/strong\u003e Splice with 18 AWG 3-conductor cable for longer reach to far-corner tents and benches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"text-align: justify;\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\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\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fff;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eTechnology\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eTime Domain Reflectometry (TDR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eVWC Range \/ Accuracy\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e0.0–1.0 m³\/m³ — ±0.02 (0–53%), ±0.04 (53–100%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fff;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eBulk EC Range \/ Accuracy\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e0–20,000 µS\/cm — ±(5% + 10 µS\/cm) to 10,000; ±8% above; 1 µS\/cm resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eTemperature Range \/ Accuracy\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e-40 to 85 °C — ±0.4 °C (-40 to 0), ±0.3 °C (0 to 85); 0.10 °C resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fff;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eOutput Interface\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eSDI-12 V1.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003ePower Supply\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e3.6–16 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fff;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eCable\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e30 ft (9 m), pre-terminated — no M8 connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eMaximum Total Run\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e175 ft (factory cable + 18 AWG 3-conductor splice)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fff;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eBuild\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eStainless steel rod, epoxy resin seal, IP68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eCompatible Host\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eGrowlink Precision Irrigation Controller (PIC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fff;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eMedia Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eRockwool, coco coir, peat blends (avoid perlite\/clay-pebble mixes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Growlink","offers":[{"title":"Default Title","offer_id":48240788603094,"sku":"GH-GLTLINK","price":249.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0723\/9450\/6454\/files\/Growlink_Terralink_Substrate_Sensor_main_image.webp?v=1778630087","url":"https:\/\/growershouse.com\/products\/growlink-terralink-substrate-sensor","provider":"GrowersHouse","version":"1.0","type":"link"}