Submersible level sensor for batch tank fill monitoring within the Growlink LINKS ecosystem.
The Growlink Batch Tank Level Sensor (GL-LINK-LEVEL) is a submersible, throw-in liquid level sensor designed to pair directly with the Growlink batch tankLINK controller. It delivers real-time tank level data to Growlink OS, enabling automated refill triggering and high/low threshold alerts that keep nutrient volumes consistent without manual checking.
The GL-LINK-LEVEL is a submersible, throw-in type liquid level sensor engineered specifically for the Growlink LINKS ecosystem. It uses a 4–20 mA output signal to transmit continuous, proportional liquid depth readings to the batch tankLINK controller, which converts that signal into real-time volume data visible on the controller's LCD and inside Growlink OS.
Unlike float switches that only give a high or low point reading, the 4–20 mA hydrostatic sensor provides a continuous analog signal across the full depth of the tank. That continuous reading is what allows the batch tankLINK to trigger automated refills at a programmable set point rather than waiting for a worst-case low-level event.
This sensor is the right add-on for any licensed cannabis or hemp cultivator already running a Growlink batch tankLINK controller — or speccing one into a new build — who needs closed-loop tank fill automation. If your operation mixes nutrients in batch tanks and currently relies on manual checks or simple float switches to manage volume, this sensor is the upgrade that removes the manual touchpoint entirely.
It's particularly relevant for multi-room and multi-site operators where a dry tank mid-cycle creates downstream irrigation failures across several zones. The GL-LINK-LEVEL feeds level data into Growlink OS so threshold alerts can be pushed to any device running the Growlink app — giving team leads visibility even when they're not physically at the tank.
Real-time continuous monitoring: The 4–20 mA output provides a live, proportional signal across the full tank depth — not just a binary high/low switch. This allows the batch tankLINK to log volume trends over time, with on-board memory storing up to 21,600 data points per sensor and graphical history available on the LCD.
Automated refill triggering: The level sensor input on the batch tankLINK automates tank refills to prevent dry-outs and maintain consistent nutrient volumes. Set a low threshold, and the controller handles the rest — no manual intervention required between cycles.
High and low alarm thresholds: Configurable high and low limits inside the batch tankLINK trigger on-screen alerts and push notifications through Growlink OS when the tank level drifts outside the target window. This catches both unexpected draw-down and overfill conditions.
Built for cultivation environments: The sensor is designed for continuous submersion in nutrient solutions and built for the temperature and humidity ranges present in commercial indoor cultivation facilities.
The GL-LINK-LEVEL connects directly to the level sensor input on the batch tankLINK controller. The batch tankLINK itself connects to the Growlink LINKS 8-Port HUB via RJ-45, or operates as a standalone controller over Wi-Fi — whichever suits your facility's wiring layout. All LINKS devices are registered and managed through Growlink OS, so the level sensor data surfaces alongside your EC, pH, temperature, climate, and irrigation data in a single dashboard.
For new builds or retrofits adding a batch mixing station, spec the batch tankLINK controller alongside this level sensor, an EC probe, a pH probe, and a temperature probe to get complete, automated nutrient tank oversight from day one. The level sensor calibration is completed on-screen through the batch tankLINK's three-button interface and is straightforward to configure during commissioning.
| SKU | GL-LINK-LEVEL |
| Sensor Type | Submersible / Throw-In Liquid Level Sensor |
| Output Signal | 4–20 mA |
| Input Voltage | 24V DC |
| Compatible Controller | Growlink batch tankLINK |
| Ecosystem | Growlink LINKS |
| Data Logging | Up to 21,600 data points per sensor (via batch tankLINK) |
| Connectivity | Wired to batch tankLINK level sensor input port |
| Application | Batch nutrient tank fill level monitoring and automated refill control |
The GL-LINK-LEVEL is sold separately as a standalone sensor — it functions as both an add-on for existing batch tankLINK installations and a replacement if an existing sensor needs to be swapped out. The batch tankLINK controller is a separate line item.
The GL-LINK-LEVEL is purpose-built for the Growlink batch tankLINK. It outputs a standard 4–20 mA signal, but the automated refill triggering, threshold alerts, data logging, and Growlink OS integration all depend on it being connected to a batch tankLINK controller. It is not designed as a generic replacement for non-Growlink systems.
The batch tankLINK controller accepts inputs for EC, pH, temperature, and tank level simultaneously. The GL-LINK-LEVEL handles the level input; separate probes (sold individually) cover EC, pH, and temperature. Together, these four inputs give you complete real-time oversight of nutrient solution quality and volume.
Once the level sensor is calibrated through the batch tankLINK's on-screen menu, you set a low-level threshold. When the measured tank level drops to that set point, the batch tankLINK triggers the configured fill output — typically a fill valve or pump — to restore volume. High and low alarms can also be set to push notifications through the Growlink app independently of the automated refill action.
Both. The batch tankLINK displays live readings and graphical history on its built-in LCD. When connected to a Growlink HUB or via Wi-Fi, all sensor data — including tank level trends — surfaces in Growlink OS and is accessible through the Growlink app on any phone or tablet.
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