PS-3228 wireless soil moisture sensor
The PS-3228 wireless soil-moisture sensor measures volumetric water content in soil and can stream live data or store data in its internal memory for long-term experiments. From evaporation and soil-composition experiments to studies of water consumption and plant competition, it helps students explore topics inside and outside the classroom. Overview: The wireless soil-moisture sensor measures soil volumetric water content (% VWC, percentage by volume), streaming live data or logging it internally for long-term experiments. Durable and easy to use, it is ideal for monitoring controlled classroom experiments and long-term outdoor experiments. To use it, dig a trench a few inches below the surface and insert the spear-shaped probe into the soil. Compact soil around the sensor to ensure accuracy. After use, loosen the surrounding soil to reduce the risk of damaging the sensor cable. The sensor determines volumetric water-content percentage by measuring the dielectric constant of the space around a blade-type capacitor. Its electric field responds to the surrounding capacitance, and this response is used to calculate soil volumetric water-content percentage. Liquid water has characteristically high capacitance and is therefore the main influence on measurements. The sensor is factory-calibrated using soil with specified volumetric water contents, and outputs measurements as a percentage of total space. Its accurate measurement range is 0% to 45%: 0% represents an almost water-free dry sample, while 45% represents soil with all available pore space saturated. To obtain percentage saturation (%), divide the measured value by 45. The sensor is calibrated for three main soil types: sand, clay, and loam. If the soil type is unknown, select the intermediate calibration, loam, which applies to the broadest range of soil conditions.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Measurement Range | 0 - 45% volumetric water content |
| Resolution | 0.1% |
| Accuracy | ±5% |
| Operating Temperature | -40 - 60°C |
| Power Dissipation [5 V DC] | 3 mA at 5 V DC |
| Probe cable length | 2 meters |
| Connection Method | USB and Bluetooth 5.2 |
| Data Logging Function | Present |
| Battery Type | Rechargeable Lithium-Polymer Battery (LiPo) |
| Data-storage capacity | >55,000 data points |
| Battery runtime [Depends on the sampling rate] | 3 - 5 days per charge (depending on sampling rate) |
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