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

TSM2 Temperature Sensor Meter

The Temperature Sensor Meter (TSM2) is a stand-alone data logging instrument for the measurement of air, soil, solution, leaf, canopy or surface temperature.

The TSM2 can support up to 9 Thermistors. For all sensors temperature is recorded as Degrees Celsius (°C).

Thermistor excitation voltage is measured at every measurement interval for increased accuracy, this voltage reading is used in the thermistor scripts to remove errors introduced from possible voltage fluctuations.
  • The TSM2 is a fully self-contained unit requiring power input from a solar panel (field applications) or 24V power supply (glasshouse applications).
  • All data is stored within the unit on a removable MicroSD card.
  • Communication with the TSM2 is made either by USB or wireless connection.
  • The TSM2 is compatible with the ICT Combined Instrument Software. The software is GUI based and extremely user-friendly. This software allows complete control of the TSM2 such as real-time measurements, data logging settings, diagnostics and sensor configuration.
  • The TSM2 has a 2 wire, non-polarised bus for power supply. There is no chance of incorrect wiring of positive and negative voltage because the TSM2 is non-polarised.
  • The TSM2 has an internal lithium polymer battery that is kept charged by an external power supply (solar panel or mains DC power supply).
  • The TSM2 is IP-65 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.


  • Plant physiology (leaf and canopy temperature)
  • Soil, air and fluid temperature
  • Thermistor strings for borehole monitoring
  • Concrete temperature during drying
  • Building energy use studies

Instrument Logging

Analogue Channels 9 Single Ended (channel 1 of 10 total is 2.5V thermistor excitation measurement)
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 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

Temperature Range -40°C to +80°C
R/H Range 0-100%
Upgradeable 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 200mA 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


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