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Optimal logging solution: Soil Moisture Meter
MP306 Soil Moisture Meter
Measure volumetric soil moisture for scientific research, agriculture and civil engineeringThe probe has a compact body and the needles are arranged in a single plane making it ideal for use in soil columns, enabling measurement of discrete soil layers within the column. Similarly in soil profiles, narrow layers can be precisely measured. Continuous measurements are made by the MP306 over time through permanent burial and stored by the Soil Moisture Meter.
The MP306 is also used to measure the moisture content in materials used in mining, roadway and buildings. The material that can be measured is often soil but can be any composition of non-metallic powdered, liquid or solid substance into which the needles are inserted. It is especially suitable for mineral stock piles, mine tailings and sand for batch mixing of concrete.
More Details Theory of Operation & Results
Theory of Operation
The MP306 has a high frequency moisture detector, which uses the standing wave principle to indicate the ratio of two or more substances forming a body of material, each substance having a different electric constant (Ka). The moisture measurement of the material is based upon the fact that in a water: soil: air matrix, the dielectric constant is dominated by the amount of water present. The soil water content can be measured exactly because changes in water content of the soil result in changes in the dielectric constant of the soil.Results
The results from measurement of absolute volumetric soil water percent (VSW%) from prepared soil samples using the MP306 are given below. This result is typical of the results obtained from comparative testing of the MP306 in prepared soil samples, for a wide range of agricultural soils. Standing Wave Technology and hence the MP306 are not affected by changes in temperature or salinity of the soil or material being measured and hence the values of VSW% are equivalent to oven dried water content.Specifications
Sensor Specifications
| MP306 Soil Moisture Probe | |
|---|---|
| Measurement | |
| Measurement Range | 0-100 VSW% |
| Accuracy | 2% VSW% after calibration to a specific soil type ± 5 VSW% using the supplied soil calibration |
| Response Time | Less than 0.5 seconds |
| Stabilisation Time | 3 seconds approximately from power-up |
| Interface | |
| Input Requirements | 7-18 V DC unregulated |
| Power Consumption | 14 mA typical, 16mA max |
| Output signal | 0-1160mV for 0-100 VSW% |
| Mechanical | |
| Total Length | 195 mm |
| Needle Length | 60 mm |
| Needle Seperation | 12 mm |
| Needles | Stainless Steel (Grade 316) - does not corrode in saline solutions |
| Exterior | ABS Plastic |
| Cable | 4.5 m Standard |
| Other | |
| Environment | Designed for permanent burial (up to 30 years) |
| Environment | Operational in saline, toxic and extreme soils/materials |
Meter Specifications
| Instrument Logging | |
| Instrument Specification Brochure | |
| Analogue Channels | 5 double ended or 10 single ended |
| Resolution | 0.00001V—24-Bit |
| Accuracy | 0.001V |
| Minimum Logging Interval | 1 second |
| Delayed Start | Suspend Logging, Customised Intervals |
| Sampling Frequency | 10Hz |
| Data | |
| Communications | USB, Wireless Radio Frequency 2.4 GHz |
| Data Storage | MicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format) |
| Software Compatibility | Windows XP, Vista and Windows 7 |
| Data Compatibility | FAT32 compatible for direct exchange of SD card with any Windows PC |
| Data File Format | Comma Separated Values (CSV) for compatibility with all software programs |
| Memory Capacity | 2GB expandable to 64GB |
| Operating Conditions | |
| Temperature Range | -40 ° C to +80 ° C |
| R/H Range | 0-100% |
| Upgradable | User Upgradeable firmware using USB boot strap loader function |
| Power | |
| Power supply | 12V DC 2-wire non polarized bus |
| Power Consumption | 20 mA |
| Internal Battery Monitoring | Logging internal battery voltage & charging current |
| Charging Rate | Automatic variable rate of charging to maximise solar panel charging current on full sun days and or under low light cloudy conditions Variable current 10 mA to 200 mA |
Image Gallery
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Features
- Volumetric soil water content measurements
- Highly accurate and precise
- Robust, stainless steel needles and epoxy body
- Measures in saline, toxic and high temperature soils
- Rapid measurement
- Can be buried for up to 20 years
Optimal logging solution:
Soil Moisture Meter
Soil Moisture Meter
Logging:
- Stand-alone logging
- MicroSD expandable memory
- Wireless connectivity and data transfer
- Simple conversion and scripting
- Flexible sensor calibration, look-up tables, and user scripts
- 24-Bit resolution
- IP68 rated water proof enclosure
- Free Windows utility configuration software
- Optional wireless logging via MCC1
- Field: solar power and 12V battery
- Lab: main power supply
- Internal Lithium-Polymer battery
- Internal voltage regulation
- Optical isolation lightening protection
Applications
- Forest and catchment hydrology
- Crop water use and studies
- Irrigation scheduling
- Landfill and mine store release covers
- Railway embankment monitoring
ICT International has provided solutions for soil, plant and environmental monitoring since 1982.
© 2003 - , ICT International
© 2003 - , ICT International