SI-111SS infrared radiometer

The SI-111SS consists of a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature sensors are housed in a rugged aluminum body that contains a germanium window.

Both the thermopile and the thermistor output a millivolt signal that most of our data loggers can measure. The data logger uses the Stefan-Boltzman equation to correct for the effect of sensor body temperature on the target temperature. The corrected readings yield an absolute accuracy of ±0.2°C from -10° to +65°C.

Field of View (FOV)

The SI-111SS has a 22-degree half-angle field-of-view (FOV). The FOV is reported as the half-angle of the apex of the cone formed by the target (cone base) and the detector (cone apex). The target is a circle from which 98% of the radiation viewed by the detector is being emitted.

Benefits and Features

• Compatible with most Campbell Scientific data loggers
• Measures surface temperature continuously in the field
• Provides road surface, plant canopy, soil surface, snow surface, and water surface temperature measurements
• Avoids influencing the temperature, providing more accurate measurements
• Ideal for providing spatial averages
• Rugged construction—two temperature probes housed in an aluminum body with a germanium window