Terralink+ Sensor

What the TerraLink+ Measures

The TerraLink+ puts three critical data points in your hands simultaneously: volumetric water content (VWC) from 0–100%, electrical conductivity (EC) from 0–23 dS/m, and substrate temperature from -40°C to 80°C — all from a single probe inserted at the root zone. VWC accuracy runs ±2% across the 1.00–40.00 dielectric permittivity range. EC accuracy is ±5% at 0–7 dS/m, with built-in temperature compensation from 0–50°C to ensure readings don't drift as your substrate temp fluctuates across the day.

TDR (Time Domain Reflectometry) technology is the reason TerraLink+ holds up where capacitance-only sensors fall apart. High-EC fertigation programs and aggressive dryback cycles are exactly the conditions that cause lesser sensors to return false readings. The TerraLink+ is engineered to stay accurate through both — giving you a substrate picture you can actually trust when it matters most.

Who This Sensor Is Built For

Licensed cannabis and hemp operators running coco, rockwool, peat, or soil substrates with structured irrigation schedules — generative or vegetative crop steering, shot-based fertigation, timed dryback targets — are the core use case. If you're dialing irrigation events by clock timers alone or reading substrate by feel, you're flying blind. The TerraLink+ gives you the numbers to set hard triggers: feed when VWC drops to X, hold when EC crosses Y, adjust strategy as root-zone temp climbs through lights-on.

The sensor also scales cleanly across a facility. Multiple TerraLink+ units connect through the canopyLINK hub (up to 8 LINKS devices per HUB), so you can instrument multiple rooms, multiple cultivars, or multiple benches within a single room and monitor them together inside Growlink OS. It's made in the USA and built for the heat, humidity, and high-frequency irrigation cycles that define commercial indoor production.

Growlink LINKS Ecosystem Integration

The TerraLink+ is part of Growlink's modular LINKS hardware platform. It plugs into a canopyLINK via its M8 connector — no exposed wiring to route through the canopy — and from there data flows in real time into Growlink OS. Inside OS, that substrate data becomes the live input for Crop Steering Copilot: the automation layer that converts your target VWC, EC, and dryback parameters into actual irrigation triggers. Instead of chasing numbers manually, Copilot acts on them.

Growlink OS also includes Nova, the platform's built-in AI, which compares performance across rooms, flags deviations from your blueprint, and surfaces crop performance insights without manual log review. The TerraLink+ is the sensing layer that makes that automation possible — accurate root-zone data in, intelligent irrigation decisions out. LINKS devices can run over Wi-Fi independently or connect to the HUB via wired RJ-45 for extended range and the ability to power additional hardware across the facility.

Installation and Substrate Compatibility

The TerraLink+ body is sealed with epoxy resin, the probe rods are stainless steel, and the full unit is IP68-rated — fully sealed against dust and continuous water submersion. That's the level of environmental protection you want in a space running multiple fertigation cycles per day with high ambient humidity. The sensor supports surface placement or direct burial in the substrate depending on your monitoring strategy.

Compatible substrates include rockwool, coco, peat, and soil. Note: mixes with high perlite or clay pebble content can affect probe contact and reading consistency — plan probe placement in your primary root-zone media. Power runs on 3.6–16V DC with a quiescent draw of just 30µA, measuring at 10mA for 150ms per reading cycle, making it practical to run multiple units across a controlled power budget. The SKU listed here (GL-LINK-TerraLINK) is the LINKS-platform version with M8 connector for canopyLINK integration.