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

Apogee SI-400 Series

Apogee infrared radiometers are the most accurate non-contact temperature sensors available anywhere. The sensors have tinned leads for connecting to a datalogger. 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.

  • Most accurate infrared radiometer on the market
  • Measures surface temperature rapidly
  • Uncertainty of 0.2°C (95% confidence)
  • 8-14 μm germanium atmospheric window
  • Radiation shield included
  • Multiple field of view (FOV) options
  • Calibrated target temperature range from -30 to 65°C
  • Rugged and lightweight
  • Available in sensor-only version with pigtail leads (for dataloggers) or with handheld meter

 

The SI-411 has an SDI-12 digital output and comes with a 22 degree half angle field of view.
The SI-421 has an SDI-12 digital output and comes with an 18 degree half angle field of view.
The SI-431 has an SDI-12 digital output and comes with a 14 degree half angle field of view.
The SI-4H1 has an SDI-12 digital output. The unique geometry of the SI-1H1 gives a wide 32 degree half angle field of view in the horizontal direction with a 13 degree half angle field of view in the vertical direction. This enables the user to mount the sensor at shallower angles without seeing above the horizon while maximising the area measured.

Common Specifications
Input Voltage Requirement 4.5 to 24V DC
Current Drain 1.1 mA (quiescent), 6 mA (Transmitting)
Calibration Uncertainty (-20 to 65°C) 0.2°C, when target and detector temperature are within 20°C*
Measurement Repeatability < 0.05°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
Spectral Range 8 to 14 um; atmospheric window
Operating Environment -45 to 80°C, 0 to 100% relative humidity (non-condensing)
Dimensions 2.3cm diameter and 6.0cm length
Mass 190g (with 5m of lead wire)
Cable 5m of four conductor, shielded, twisted-pair wire. Additional cable available in multiples of 5m.
Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions).
Pigtail lead wires.
Warranty 4 years

*Excluding the SI-431, 0.3°C.

SI-411 Specific
Field of View 22° half angle

 

SI-421 Specific
Field of View 18° half angle
Calibration Uncertainty (-40 to 80°C) 0.5°C, when target and detector temperature are different by more than 20°C

 

SI-431 Specific
Field of View 14°C half angle
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

 

SI-4H1 Specific
Field of View 32° horizontal half angle; 13° vertical half angle
Calibration Uncertainty (-40 to 80°C) 0.5°C, when target and detector temperature are different by more than 20°C

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 0.6 seconds. Each IRR carries an impressive uncertainty of 0.2°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 bands 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 temperature, from -30 to 65°C, allows you to make accurate terrestrial measurements when the sensor body temperature is within 20°C of the target temperature. A durable clear anodised aluminium housing makes your sensor strong and lightweight, capable of withstanding extreme weather conditions.