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.


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


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


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