Soil Moisture Sensor
Monitor root-zone moisture down to 0.1% resolution for optimized irrigation and mixing control with the Soil Moisture Sensor.
Key Benefits:
- Precise soil moisture readings for irrigating only when needed
- Automated watering triggers prevent over- or under-watering
- Get healthier plants and a better harvest
- Save time and labor by reducing manual soil checks
$299.00
Shipping calculcated at Checkout | *17% surcharge calculated on all hard goods.
| Measurement Range | 0% VWC to saturation |
| Accuracy | ±3% VWC @ EC < 8 mS/cm |
| Resolution | 0.1% VWC |
| Response Time | Immediate |
| Oscillator Frequency | 80 MHz |
| Output | Analog voltage (0.5 to 1.5 V for 3V excitation) |
| Power | 3–5 V @ 6–10 mA |
| Connector | 2.5 mm stereo pin |
| Cable Length | 6 ft (1.8 m), 20 ft (6 m), extendable up to 100 ft |
| Temperature Range | 33–175 °F (0.5–80 °C) |
| Dimensions | 2.4 in (6 cm) x 0.8 in (2 cm) x 0.1 in (0.3 cm) |
1. Is the Soil Moisture Sensor compatible with Link4 systems?
Yes—works seamlessly with Link4 Pearl and cloud-connected controllers.
2. Can it be placed at depth in soil?
Absolutely—it’s ideal for bottom heat and root-zone monitoring.
3. How easy is it to install?
Plug-and-play: simply insert probe, connect analog output to controller.
4. Does it need calibration?
No—includes factory calibration; just wire and begin monitoring.
5. What does a soil moisture sensor do?
A soil moisture sensor measures the water content in soil, helping growers know when and how much to irrigate.
6. Where should I install the sensor?
Place the sensor in the root zone of your crops, typically halfway between the plant stem and the edge of the planting area.
7. How deep should I insert the sensor?
It depends on your crop type, but generally between 6 to 12 inches for most plants. Deeper placement may be needed for trees or deep-rooted crops.
8. Can the soil moisture sensor help me reduce water usage?
Yes. By irrigating based on actual soil conditions instead of a fixed schedule, many growers cut water waste by up to 30–50%.
9. How does the sensor differentiate between actual soil moisture and temporary surface water from irrigation?
The sensor measures moisture where it matters most - in the root zone. That way, you see real plant-available water, not false spikes from surface irrigation or rainfall.
10. How deep can the sensor be inserted, and is it suitable for root-zone monitoring in deep beds?
It can be inserted up to 20 cm (8 in), making it ideal for tracking soil moisture right in the root zone. Its slim design also works well in deep beds and varied substrates, giving you accurate readings where plants need it most.
11. Is there cloud integration available to log and analyze moisture data over time?
Yes, when connected to the Link4 Cloud, the Pearl controller automatically logs soil moisture data from your sensors. You can view trends, generate history reports, and analyze changes over time to fine-tune your irrigation and maximize efficiency.
12. How does it handle saline conditions? Does high EC in the soil affect accuracy?
Yes, high salinity (high EC) can impact accuracy. The sensor measures dielectric properties of the soil, which can be influenced by salts. In most greenhouses and field conditions, readings remain reliable, but in very saline soils, calibration may be required for best accuracy.
Link4 Cloud for Web, Android, and iOS
The Link4 Cloud is the latest innovation to Link4’s Cloud technology, supporting the new Pearl controller.
Monitor and set your controllers from anywhere. Create reports, view graphs, and collect data. Log notes using the Grow Journal. Do all of this and more using the intuitive user interface.
