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

TSM1 Infrared Data Logger

The TSM1 Temperature Sensor Meter is a stand-alone logging instrument for the measurement of leaf, canopy, soil or surface temperature.
The TSM1 can support up to 5 Apogee Instruments or Everest Interscience Infrared Thermometers. For all sensors temperature is recorded as degrees Celsius.

The TSM1 Temperature Sensor Meter is a fully functional, plug-and-play system. The infrared temperature sensors have been calibrated and programmed to operate with the TSM1 by expert engineers at ICT International. Therefore there is no requirement to spend lengthy amounts of time writing and checking scripts.
The TSM1 is a complete system with an integrated data logger, breakout board, internal power supply, and has ICT wireless communications with MCC devices. A free interface software is available with the TSM1 so all the user needs to do is assign a logging interval, connect an external power supply, and point the infrared sensor at the sample object.

Instrument Logging

Analogue Channels 5 differential or 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 7, 8, 8.1 and 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%
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 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


  • The TSM1 is a fully self-contained unit, only requiring power input from a 20W solar panel (field applications) or 24V power supply (glasshouse applications).
  • The TSM1 is a stand-alone instrument and does not have extensive cabling and power requirements. All data is stored within the unit on a removable MicroSD card.
  • Communication with the TSM1 is made either with a USB or wireless connection. Wireless is capable of distances up to 250m.
  • The TSM1 has 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 TSM1 has 2 wire, non-polarised bus for power input. There is no chance of incorrect wiring of positive and negative voltage because the TSM1 is non-polarised.
  • The TSM1 has an internal lithium polymer battery that is kept charged by an external power supply (solar panel or mains). The instrument has internal voltage regulation for maximum power reliability.
  • The TSM1 is IP-65 rated and have been demonstrated to operate in extreme environmental conditions. Units are being used in diverse environments, hot Australian deserts, tropical Amazon rainforests, temperate German forests, Indian agricultural fields and North American Arctic cold.

Applications include:

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


  • Apogee SI-111 Standard View
    Standard Field of View Infrared Radiometer Sensor
  • Apogee SI-121 Narrow View
    Narrow Field of View Infrared Radiometer Sensor
  • Apogee SI-131 Ultra-Narrow
    Ultra-Narrow Field of View Infrared Radiometer Sensor
  • Apogee SI-1H1 Horizontal View
    Horizontal Field of View Infrared Radiometer Sensor
  • ICT Universal Telemetry Hub
    ICT Universal Telemetry Hub
  • MCC Mini
    The MCC Mini is a simple to use USB Serial to Radio Communications device providing a high level of integrity in data transfers. Its miniature design and minimalist approach make it an attractive solution for portable computers and less intrusive workstation setups where space and weight are of concern.
  • Data to the Web
    Wireless Communication Module - Includes; MCC Radio Frequency Logging Hub, Comms and ICT Data View Software, GSM/2G/3G modem, 3V 5Ah Lithium Polymer Battery, 11W solar panel, IP66 enclosure. 
  • Wireless Data Collector
    Wireless data logger. 4GB SD Card storage. Communicates with any ICT International instrument.
    DRONE-THERM™, Temperature range -40°C to 100°C, Analog Millivolt (10.0 mV/°C), Line of Sight, 4° or 15°, Fixed Mounted, Miniature.
    ENVIRO-THERM™, Temperature range -40°C to 100°C, RS-232C or Analog mV (10.0 mV/°C), Line of Sight, 4° or 15°, Fixed Mounted, SKY-SPY™
    VARIO-TERM™, Analog Millivolt (10.0 mV/°C), Field Focusable, Converging, 2 mm Spot Size to 4°, Fixed Mounted, TTL/SLR, Vario-Zooom™

Ajayi, A.E. and Olufayo, A.A. 2004, ‘Evaluation of Two Temperature Stress Indices to Estimate Grain Sorghum Yield and Evapotranspiration‘, Agronomy Journal, vol. 96, pp. 1282-1287.

American Society for Testing and Materials 2001, ‘Standard Test Methods for Radiation Thermometers (Single Waveband Type). Designation: E 1256 – 95 (Reapproved 2001)‘, in 2001 Annual Book of ASTM Standards, American Society for Testing and Materials, West Conshohocken.

Bugbee, B., M. Droter, O. Monje and B. Tanner 1998. ‘Evaluation and Modification of Commercial Infra-red Transducers for Leaf Temperature Measurement‘, Advances in Space Research, vol. 22, no. 10, pp. 1425-1434.

Bugbee, B., O. Monje and B. Tanner 1996. ‘Quantifying Energy and Mass Transfer in Crop Canopies: Sensors for Measurement of Temperature and Air Velocity‘, Advances in Space Research, vol. 18, no. 4-5, pp. 149-156.

Diaz, R. A., A. D. Matthias and R. J. Hanks 1983. ‘Evapotranspiration and Yield Estimation of Spring Wheat from Canopy Temperature‘, Agronomy Journal, vol. 75, no., pp. 805-810.

Fuchs, M. (1990). ‘Canopy Thermal Infrared Observations’, in Instrumentaiton for Studying Vegetation Canopies for Remote Sensing in Optical and Thermal Infrared Regions. eds. S. G. Narendra and J. M. Norman. London, Harwood Academic Publishers. 5: 323-333.

Fuchs, M. and C. B. Tanner 1966. ‘Infrared Thermometry of Vegetation‘, Agronomy Journal, vol. 58, no., pp. 597-601.

Garrot, D.J., Gibson Jr., R.D. and Kilby, M.W. 1998, ‘The Response of Table Grape Growth, Production, and Ripening to Water Stress‘, in 1998 Citrus and Deciduous Fruit and Nut Research Report, eds. G. Wright and M. Kilby, University of Arizona, Tuscon.

Garrot Jr, D. J., M. J. Ottman, D. D. Fangmeier and S. H. Husman 1994. ‘Quantifying Wheat Water Stress with the Crop Water Stress Index to Schedule Irrigations‘, Agronomy Journal, vol. 86, no., pp. 195-199.

Hattendorf, M.J., Carlson, R.E., Halim, R.A. and Buxton, D.R. 1988, ‘Crop Water Stress Index and Yield of Water-Deficit-Stressed Alfalfa‘, Agronomy Journal, vol. 80, pp. 871-875.

Irmak, S., Haman, D.Z. and Bastug, R. 2000, ‘Determination of Crop Water Stress Index for Irrigation Timing and Yield Estimation of Corn‘, Agronomy Journal, vol. 92, pp. 1221-1227.

Jackson, R. D. (1982). Canopy Temperature and Crop Water Stress. In Advances in Irrigation. G. S. Campbell and M. D. Campbell. New York, Academic Press. 1: 43-85.

Jackson, R. D., S. B. Idso, R. J. Reginato and P. J. Pinter Jr. 1981. ‘Canopy Temperature as a Crop Water Stress Indicator‘, Water Resources Research, vol. 17, no. 4, pp. 1133-1138.

Kirkham, M. B. (2005). ‘Chapter 24: Measurement of Canopy Temperature with Infrared Thermometers.’ Principles of Soil and Plant Water Relations. Burlington, Elsevier: 425-435.

Sadler, E.J., Bauer, P.J., Busscher, W.J. and Millen, J.A. 2000, ‘Site-Specific Analysis of a Droughted Corn Crop: II. Water Use and Stress‘, Agronomy Journal, vol. 92, pp. 403-410.

Schaamfsma, A. W., G. H. Whitfield, T. J. Gillespie and C. R. Ellis 1993. ‘Evaluation of Infrared Thermometry as a Non-destructive Method to Detect Feeding on Corn Roots by the Western Corn Rootworm (Coleoptera: Chrysomelidae)‘, The Canadian Entomologist, vol. 125, no., pp. 643-655.