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SI-4HR: Research-Grade SDI-12 Road Surface Infrared Radiometer Sensor

Updated:2025-03-13

Brand: Apogee
Model: SI-4HR
Description: he SI-4HR-SS infrared radiometer is developed for road weather networks specifically, with a 10° vertical field of view, allowing for remote detection of a narrow and distant target roadway. The...
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Product Details

SI-4HR: Research-Grade SDI-12 Road Surface Infrared Radiometer SensorFunctional Characteristic：

User's Manual Technical Drawing

The SI-4HR infrared radiometer is developed for road weather networks specifically, with a 10° vertical field of view, allowing for remote detection of a narrow and distant target roadway. The rectangular-shaped aperture maximizes the horizontal field of view allowing for a larger integrated measurement without including undesired target areas such as sky or surrounding terrain. The elongated external shield is designed to better protect from snow and ice building up on the sensor. The SI-4HR has an SDI-12 digital output and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor has a response time of 0.6 seconds. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

SI-4HR: Research-Grade SDI-12 Road Surface Infrared Radiometer SensorDrawing：

SI-4HR Drawing

SI-4HR: Research-Grade SDI-12 Road Surface Infrared Radiometer SensorSpecification：

Input Voltage Requirement	5.5 to 24 V DC
Current Draw	1.5 mA (quiescent), 2.0 mA (active)
Calibration Uncertainty (-30 to 65 C), when target and detector temperature are within 20 C	0.3 C
Calibration Uncertainty (-40 to 80 C), when target and detector temperature are different by more than 20 C	0.5 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	5° vertical half angle; 16° horizontal half angle
Spectral Range)	8 to 14 μm; atmospheric windown
Operating Environment	-50 to 80 C; 0 to 100 % relative humidity (non-condensing)
Dimensions	23 mm diameter, 60 mm length
Mass	219 g (with 5m 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), aditional cable available
Warranty	4 years against defects in materials and workmanship
Manufactured	Made in the USA