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

TRM Thermistor Sensor Meter

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

The Thermistor Sensor Meter (TRM) can support up to 10 Thermistors. For all sensors temperature is recorded as degrees Celsius.

  • The TRM is a fully self-contained unit requiring power input from a 22W solar panel (field applications) or 24V power supply (glasshouse applications).
  • The TRM is a stand-alone instrument and does not need extensive cables and power requirements. All data is stored within the unit on a removable MicroSD card.
  • Communication with the TRM is made either by USB or wireless connection. Wireless is capable of up to 250m range.
  • In conjunction with an ICT web-based controller, the TRM 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 TRM has a Windows 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 measurement, diagnostics and sensor configuration can easily be made.
  • 2 wire, non-polarised bus for power input. There is no chance of incorrect wiring of positive and negative voltage because the TRM is non-polarised.
  • The TRM 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 TRM 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.

Instrument Logging

Analogue Channels 10 single ended
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 and 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
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