Horizontal Field of View Infrared Radiometer Sensor SDI-12

In stock (can be backordered)


In stock (can be backordered)

SKU: SN-SI-4H1-SS Categories: , , , Tags: , , , ,


High-accuracy, non-contact surface temperature measurements for environmental applications in harsh conditions.

The SN-SI-4H1SS has an SDI-12 digital output and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The unique geometry of the sensor gives a wide 32° half-angle field of view in the horizontal direction with a 13° 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 maximizing the area measured. The sensor has 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.

Rugged Housing

All sensors have a rugged, anodized, aluminum body with fully-potted electronics. Both types feature a radiation shield to reduce rapid thermal fluctuations of the sensor body. The Research-Grade sensor’s radiation shield is made from powder-coated aluminum with a polished interior for lower emissivity. The Commercial-Grade sensor’s radiation shield is made from rugged, polished, UV-resistant ASA plastic.

High-Accuracy Measurements

All Apogee IR sensors are NIST traceable and include a calibration certificate. Sensors are calibrated to a custom blackbody cone. The Research-Grade sensors feature a measurement uncertainty of ± 0.2 C from -30 to 65 C when the sensor (detector) temperature is within 20 C of the surface (target) being measured. Commercial-Grade sensors have a measurement uncertainty of ± 0.5 C from 0 to 50 C when the sensor is within 20 C of the surface. Radiometers are only sensitive from 8 to 14 µm (atmospheric window) to minimize the influence of water vapor and CO2 on the measurement.

High Quality Cable

Research-Grade pigtail lead sensors feature an IP68, marine-grade stainless-steel cable connector (approximately 30 cm from the head) to simplify sensor removal for maintenance and recalibration. The cable features a shielded, twisted-pair wire with a TPR jacket for high water resistance, UV stability, and flexibility in cold conditions. Commercial-Grade pigtail lead sensors have the same high-quality cable, but they do not have a stainless-steel connector.

Field of View Options

Research-Grade sensors come in five fields of view, which includes three circular and two horizontal apertures. The Commercial-Grade sensor comes in a single 22° half-angle field of view option.

Brief Overview of Infrared Radiometers

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