The SI-421 has an SDI-12 digital output. The sensor has an 18° half-angle field of view and a response time of 0.1 seconds. Typical applications include plant canopy temperature measurement for use in plant water status estimation, road surface temperature measurement of determination of icing conditions, and terrestrial surface (soil, vegetation, water, snow) temperature measurement in energy balance studies. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.
High Throughput Field Phenotyping Multi-sensor System
Infrared radiometer measures canopy temperature on a multi-sensor system for high throughput field phenotyping in soybean and wheat breeding.
Weather Information Service Engine Project (WISE)
SI-111 Infrared Radiometers measure building surface temperature as part of Weather Information Service Engine (WISE) Project.
Temperature Free-Air Controlled Enhancement T-FACE
Simulating warmer conditions by applying a heat treatment to open-field plant canopies. Infrared radiometers provide the data and control the heated plot temperatures.
Measuring ground surface temperature to measure snow runoff.
Forecasting Ice Formations
Forecasting ice formation on road surfaces using infrared radiometers on a mobile system.
Colombia Rose Fungus Study
Studying conditions that cause fungus growth on roses.
Crop Water Stress Index
Using infrared radiometers to determine water schedule for plants.
Measuring the temperature of the interface between the earth's surface and its atmosphere on automated meteorological networks spaced evenly across Oklahoma.
Input Voltage Requirement 4.5 to 24 V DC Current Draw 0.6 mA (quiescent), 1.3 mA (active) Measurement Range -60 to 110 C (uncertainty has been determined for ranges below) Calibration Uncertainty (-20 to 65 C) 0.2 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 Less than 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 0.6 s, time for detector signal to reach 95 % following a step change, fastest data transmission rate for SDI-12 circuitry is 1 s Field of View 18° half-angle Spectral Range 8 to 14 µm; atmospheric window Operating Environment -55 to 80 C; 0 to 100 % relative humidity (non-condensing) Dimensions 23 mm diameter, 60 mm length Mass 190 g (with 5 m of lead wire) Cable 5 m of four conductor, shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions), additional cable available Warranty 4 years against defects in materials and workmanship