STM Soil Tension Meter
The STM Soil Tension Meter is a stand-alone logging instrument for the measurement of soil water potential.
The STM Soil Tension Meter can support up to 5 pressure transducers. ICT International supplies 3 different types of pressure transducers which can measure in the ranges: ±7 kPa, ±100 kPa or -100 to +200 kPa. Tensiometers include designs for soil columns and field sites.
The STM is a fully self-contained unit requiring power input from a 22W solar panel (field applications) or 24V power supply (laboratory applications). Communication is via a USB port or wireless connectivity. The STM is IP-65 rated and has a Windows and Mac compatible GUI for complete logging solutions including look-up tables, scripts and sensor calibration capabilities.
Applications:
- Soil column testing
- Moisture retention curves
- Geotechnical engineering
- Soil water potential for irrigation monitoring
The continuous measurement of soil water potential in the field, glasshouse or soil columns.
- Precise measurements of soil matric potential
- Live monitoring of sorption and desorption curves
- Up to 5 sensor capacity
- The STM is a fully self-contained unit requiring power input from a 22W solar panel (field applications) or 24V power supply (laboratory applications).
- Communication is via a USB port or wireless connectivity.
- The STM is IP-65 rated and has Windows and Mac compatible software for complete logging solutions including look-up tables, scripts and sensor calibration capabilities.
- The STM is a stand-alone instrument and does not have extensive cabling and power requirements. All data is stored within the unit on a removable MicroSD card.
- The STM has 2 wire, non-polarised bus for power input. There is no chance of incorrect wiring of positive and negative voltage because the STM is non-polarised.
- The STM has an internal lithium-polymer battery that is kept charged by an external power supply (solar panel or mains). The instrument has an internal voltage regulation for maximum power reliability.
- The STM is IP65 rated and has been demonstrated to operate in extreme environmental conditions. Units are being used in diverse environments from hot Australian deserts, tropical Amazon rainforests, temperate German forests, Indian agricultural fields and North American Arctic cold.
Specifications |
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| Analogue Channels | 5 differential |
| Resolution | 0.00001V—24-Bit |
| Accuracy | 0.001V |
| Minimum Logging Interval | 1 second |
| Delayed Start | Suspend Logging, Customised Intervals |
| Sampling Frequency | 10Hz |
Data |
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| Communications | USB, Wireless Radio Frequency 2.4 GHz |
| Data Storage | MicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format) |
| Software Compatibility | Windows 8, 8.1 & 10. Mac OS X |
| Data Compatibility | FAT32 format for direct exchange of SD card with any PC |
| Data File Format | Comma Separated Values (CSV) for compatibility with all software programs |
| Memory Capacity | Up to 16GB, 4GB microSD card included. |
Operating Conditions |
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| Temperature Range | -40°C to +80°C |
| R/H Range | 0-100% |
| Upgradeable | User Upgradeable firmware using USB boot strap loader function |
POWER |
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| Internal Battery Specifications | |||
| 960mAh Lithium Polymer, 4.20 Volts fully charged | |||
| External Power Requirements | |||
| Bus Power | 8-30 Volts DC, non-polarised, current draw is 190mA maximum at 17 volts per logger | ||
| USB Power | 5 Volts DC | ||
| Internal Charge Rate | |||
| Bus Power | 60mA – 200mA Variable internal charge rate, maximum charge rate of 200mA active when the external voltage rises above 16 Volts DC | ||
| USB Power | 100mA fixed charge rate | ||
| Internal Power Management | |||
| Fully Charged Battery | 4.20 Volts | ||
| Low Power Mode | 3.60 Volts – Instrument ceases to take measurements | ||
| Discharged Battery | 2.90 Volts – Instrument automatically switches off at and below this voltage when no external power connected. | ||
| Battery Life varies | |||
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