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

Apogee MI-220 Narrow Field of View

The MI-220 has a narrow FOV half angle of 18 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 Infrared Radiometers (IRRs) measure surface temperature by converting thermal energy radiated from any surface in its field-of-view (FOV) to an electrical signal with a response time of less than 1 second. Each IRR carries an impressive uncertainty of 0.3°C at 95% confidence to ensure accurate measurements. The resilient 8-14 µm germanium window corresponds to the atmospheric window in order to minimise the effects of water bends below 8 µm and above 14 µm. The radiation shield, included free of charge with every IRR, insulates your sensor from rapid temperature changes, thus reducing noisy measurements.

Multiple field-of-view (FOV) options range from half angles of 14, 18, and 22 degrees, for circular apertures, to 13 and 32 degrees for the vertical and horizontal half angles, respectively, of the horizontal aperture. The large range of calibrated target temperatures, from -30 to 65°C, allow you to make accurate terrestrial measurements when the sensor body temperature is within 20°C of the target temperature. Durable clear anodised aluminium housing makes your sensor strong and lightweight, capable of withstanding extreme weather conditions.


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: 18° 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 to 50°C
Meter Dimensions: 12.6cm length, 7.0cm width, 2.4cm height
Sensor Dimensions: 2.3cm diameter and 6.0cm 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 conditons)
Warranty: 4 years

MI-220 Sensor Dimension
MI-220 meter dimensions