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

MI-230 Ultra-Narrow FOV Infrared Radiometer

The MI-230 has an ultra-narrow FOV half angle of 14 degrees and the handheld unit displays and stores the current target temperature. Applications include measuring the temperatures of road surfaces, plant canopies, and soil, snow and water surfaces. Measurement of surface temperature is a crucial component of energy transfer. Accurate measurement of the leaf-to-air temperature gradient is essential to the determination of transpiration rate and stomatal conductance in both single leaves and plant canopies.

Apogee Instruments MI series infrared meters consist of a handheld meter and a dedicated infrared radiometer, which includes a thermopile detector, germanium filter, precision thermistor (for detector reference temperature measurement), and signal processing circuitry mounted in an anodised aluminium housing.

All infrared meters also come with a radiation shield designed to minimise absorbed solar radiation, but still allowing natural ventilation. The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of the radiometer closer to the target temperature. The separate sensors are potted solid with no internal air space and are designed for continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments.

The meters provide a real time temperature reading on the LCD display and come equipped with manual and automatic data logging features for making spot check measurements or monitoring temperature over time.

Calibration Uncertainty (-20 to 65°C): ± 0.3°C, when target and detector temperature are within 20°C
Calibration Uncertainty (-40 to 80°C): ± 0.5°C, when target and detector temperature are different by more than 20°C
Measurement Repeatability: ± 0.1°C
Stability (Long-term Drift): less than 2% change in slope per year when germanium filter is maintained in a clean condition
Response Time: 0.2s
Field of View: 14° half angle
Spectral Range: 8 to 14 µm; atmospheric window
Operating Environment: 0 to 50°C, < 90 % non-condensing relative humidity up to 30°C, < 70% non-condensing relative humidity from 30°C
Meter Dimensions: 12.6 cm length, 7.0 cm width, 2.4 cm height
Sensor Dimensions: 2.3 cm diameter and 6.0 cm length
Mass: 270g (with radiation shield)
Cable: 2m of four conductor, shielded, twisted-pair wire. Additional cable available. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions)
Warranty: 4 years
  • AA-100: Protective Carrying Case
    Protective carrying case designed to transport and store Apogee meters, sensors, and accessories.
  • Infrared Radiometer/Frost Detector Mounting Bracket
    The AM-210 mounting bracket is designed to orient sensors at varying angles to satisfy all applications. The bracket can be mounted to a mast or pipe with an outer diameter of 1.3 to 2.1 inches, while the sensor bracket will accommodate sensors with an outer diameter of 1.0 to 1.5 inches (e.g. SI-100 series and SF-110).