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.
|Analogue Channels||5 differential|
|Minimum Logging Interval||1 second|
|Delayed Start||Suspend Logging, Customised Intervals|
|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.|
|Temperature Range||-40°C to +80°C|
|Upgradable||User Upgradeable firmware using USB boot strap loader function|
|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|
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.
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 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.