Soil Moisture Probe – HydroXoil SMT100®

Description

Precision Soil Monitoring for Agriculture, Research & Climate Studies

The HydroXoil SMT100 is a high-precision low-cost soil moisture probe sensor that measures volumetric water content and soil temperature for agriculture, farming, soil research, and climate monitoring.

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Accurate Soil Moisture Measurement for Critical Applications

The HydroXoil SMT100 Soil Moisture Probe delivers reliable and repeatable measurements of soil water content. Built for agricultural irrigation, soil science, and climate research, it gives professionals the data they need to monitor soil conditions with confidence.

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Why Choose the HydroXoil SMT100 Soil Moisture Probe Sensor?

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Key Applications of SMT100 Soil Moisture Probe

• Agriculture and Irrigation – Optimize watering schedules, conserve resources, and improve crop yields in sandy soils.

• Soil and Climate Research – Generate precise moisture data for climate models, drought studies, and soil science projects.

• Environmental Monitoring – Track moisture in coastal dunes, desertification regions, and erosion-sensitive areas.

• Urban and Civil Engineering – Monitor soil beneath pavements, urban greenspaces, and research on heat island effects.

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How Does the SMT100 Soil Moisture Probe Work

1. Easy Installation – Insert the probe into the soil at the desired depth.

2. Moisture Detection – The probe measures dielectric permittivity and converts it into volumetric water content.

3. Data Transmission – Choose digital or analog output to connect directly to data loggers, controllers, or IoT systems.

4. Continuous Monitoring – Gather consistent, real-time data for long-term soil moisture analysis.

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Technical Specifications

• Moisture Range: 0–60% VWC (limited accuracy up to 100%)

• Accuracy: ±3% with factory calibration, ±1% with site-specific calibration

• Temperature Range: –40 °C to +80 °C digital; –40 °C to +60 °C analog

• Response Time: <50 ms digital, <500 ms analog

• Resolution: 0.1% VWC, 0.01 °C temperature

• Interfaces: RS-485, SDI-12, Analog (0–10 V), 4–20 mA, UART

• Power Supply: 4–24 V DC (analog requires 12–24 V for 0–10 V output)

• Build: Fiberglass-reinforced probe, epoxy-potted electronics, 10 m standard cable

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Trusted by Farmers, Researchers, and Professionals

• Hydrology and Climate Studies – Used worldwide to monitor soil water content in climate and drought research.

• Urban Applications – Supports testing of permeable pavements and monitoring soil moisture in city planning projects.

• Long-Term Sensor Networks – Hundreds of units deployed in research fields, delivering stable and reproducible data for over ten years.

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Related Products

• HydroXoil Pro Hand-Held Meter – A portable companion device that lets you take field measurements directly with the SMT100 probe. Ideal for soil sampling, spot testing, and agricultural fieldwork.

• HydroXoil Log100 Data Logger – A compact and powerful logger designed to connect with multiple SMT100 probes for long-term monitoring projects. Perfect for soil studies, environmental monitoring, and climate research.

These products expand the capabilities of the SMT100 and allow you to build a complete soil moisture monitoring system.

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Frequently Asked Questions

Q: How accurate is the probe in sandy soils?
A: Expect ±3% accuracy with factory calibration. For best performance, apply a site-specific calibration to achieve ±1%.

Q: Can it handle extreme weather?
A: Yes. The probe operates reliably from –40 °C up to +80 °C and is fully waterproof for long-term outdoor use.

Q: What data systems can it connect to?
A: The probe supports RS-485, SDI-12, analog, and UART outputs, making it compatible with most loggers and IoT systems.

Q: How durable is the SMT100?
A: It’s built with rugged materials, epoxy sealing, and reinforced probes to withstand harsh environmental conditions.

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Get Started with HydroXoil SMT100

• Request a Quote – See how the SMT100 fits your project needs.

• Order a Sample Unit – Test the probe in your own soil conditions.

• Talk to Our Experts – Get advice on calibration and integration.

Contact Seztec USA Today – Your partner in precise soil moisture measurement.

 

Soil volumetric water content (VWC):

Using factory calibration up to ± 3% (VWC) in mineral soils
with moderate salinity from 0 to 50% VWC
Using medium specific calibration up to ± 1% (VWC)

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Temperature:

Typical ± 0.2°C, max. ± 0.4°C over full range (analog version ± 0.8°C)

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Additional output (digital versions only):

Raw measurement data
Dielectric permittivity

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Resolution

0.1% volumetric water content or better
0.01°C or better (analog version 0.2°C)

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Range

0 to 60% volumetric water content (up to 100% volumetric water content with limited accuracy)
Temperature: -40 to +80°C (analog version -40 to +60°C)

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Output options

RS-485 with TBUS
RS-485 with Modbus
RS-485 with ASCII
SDI-12
Analog: 0 – 10 V (other voltage ranges on request)
4-20 mA (only volumetric water content)
Low voltage UART (especially for IoT radio modules)

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Power

4-24 V DC, up to 40 mA during measurement (analog version 12 – 24 V DC for 0 – 10 V output)
Measurement time digital versions: less than 50 ms
Measurement time analog versions: less than 500 ms

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Cable length

10m

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Sensor dimensions

18.2 cm x 3 cm x 1.2 cm

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Data logger compatibility

Logger capable of appropriate power excitation and RS-485 (TBUS, Modbus, ASCII), SDI-12 or analog input
Free PC logger software available on request