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Enabling better global research outcomes in soil, plant & environmental monitoring.

SOM1 Soil Oxygen Meter

The SOM1 Soil Oxygen Meter is a stand-alone logging instrument for the measurement of soil oxygen content (%) of soils.

The SOM1 can support up to five ICTO2 Soil Oxygen Sensors. The SOM1 is a continuously logging instrument, for the in-situ measurement soil oxygen content (%). Sensors are designed to be installed in the field for days to years at a time.

The ICTO2 Soil Oxygen Sensors are individually calibrated by ICT International’s technicians. The calibration is stored within the SOM1 for highly accurate and reliable soil oxygen content measurements.

The SOM1 is a fully self-contained unit requiring power input from a 20W solar panel (field applications) or 24V power supply (glasshouse applications). Communication is via a USB port or wireless connectivity. The SOM1 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.

Specifications

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

Communications USB, Wireless Radio Frequency 2.4 GHz
Data Storage MicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format)
Software Compatibility Windows 7, 8, 8.1 & 10. Mac OS X
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 Up to 16GB, 4GB MicroSD card included.

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

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
Example A: With a recommended solar panel and/or recommended power source connected, operation can be continuous.
Example B: Power consumption is dependent on number and type of sensors connected, frequency of measurement and measurement duration
SOM1 Soil Oxygen Meter

  • The SOM1 is a stand-alone instrument and does not require extensive cables and power requirements. All data is stored within the unit on a removable MicroSD card.
  • Communication with the SOM1 is made either by USB or wireless connection. Wireless is capable of a range of up to 250m.
  • In conjunction with an ICT web-based controller, the SOM1 and/or individual sensors can be controlled remotely. Real-time, live measurements can be made remotely from any location with internet access. Data can be logged directly onto a remote computer or stored in the field on an ICT log server which can then be accessed via the internet.
  • The SOM1 has a Windows and Mac compatible configuration software. The software is GUI based and extremely user-friendly. Custom calibration equations or data can be entered and edited via the software. Real-time measurements, diagnostics and sensor configuration can easily be made.
  • The SOM1 has 2 wire, non-polarised bus for power input and data. Because the SOM1 is non-polarised there is no chance of incorrect wiring of positive and negative voltage.
  • ICT International can offer to assist with defining objectives of measurement programs, developing a plan for measurement and interpreting data.

The SOM1 is ideally used in combination with an ICT Light Sensor Meter to obtain O2 concentration and Photosynthetically Active Radiation (PAR) data, as in Figure 4.
SOM figure

 Logging:
  • Stand-alone logging
  • 4GB MicroSD Removable Storage Card (capacity: 10+ years data storage)
  • Wireless connectivity and data transfer
  • Simple conversion and scripting
  • Flexible sensor calibration, look-up tables, and user scripts
  • 24-Bit resolution
  • IP65 rated water proof enclosure
  • Free Windows and Mac configuration software
  • Optional wireless logging

Power management:

  • Field: solar power and 12V battery
  • Lab: main power supply
  • Internal Lithium-Polymer battery
  • Internal voltage regulation
  • Optical isolation lightning protection

Applications

Geotechnical Engineers
The ICTO2 Soil Oxygen Sensor is not affected by saline or sodic soils and can be used in wide ranging applications. For example: in the mining and landfill industries, the sensors could be buried in wastes to aid assessment of the effectiveness of covers designed to reduce oxygen flux into the waste.
Plant Physiologists
Plant species vary in their tolerance to anaerobic and oxygen deprived soils. The Soil Oxygen Meter can quantify the exact level of tolerance for all plant species. Plant root systems uptake oxygen to support respiration and other energy requirements. Figure 4 shows a correlation between photosynthetically active radiation (PAR) and soil oxygen where a noticeable decrease in soil oxygen content occurs during the day. With additional measurements this decrease in oxygen content can be related to plant or microbe activity. The formation of aerenchyma in plant roots is a common morphological response to decreased oxygen in soils. The Soil Oxygen Meter can be used to quantify the level of soil oxygen content whereby this occurs for individual plants.

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