The SI-111 (previously known as the IRR-P) is a precision infrared radiometer made by Apogee Instruments that makes continuous measurements in field conditions. The SI-111 is composed of a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature probes are housed in a rugged aluminum body that contains a germanium window. Both the thermopile and the thermistor output a millivolt signal. Our dataloggers measure the millivolt signals and apply the Stefan-Boltzman equation, which corrects for the effect of sensor body temperature on the target temperature.

Features

Measures surface temperature continuously in the field.
Allows measurement of road surface, plant canopy, soil surface, snow surface, and water surface temperatures.
Mounts to a crossarm, mast, or user-supplied pole via a CM230 Adjustable Inclination Mount.

Specifications

Input Power: 2.5 V excitation for thermistor
Absolute Accuracy: ±0.2°C @ -10° to +65°C; ±0.5°C @ -40° to +70°C
Uniformity: ±0.1°C @ -10° to +65°C; ±0.3°C @ -40° to +70°C
Repeatability: ±0.05°C @ -10° to +65°C; ±0.1°C @ -40° to +70°C
Response Time: <1 s to changes in target temperature
Target Temperature Output Signal: 60 μV per °C difference from sensor body
Body Temperature Output Signal: 0 to 2500 mV
Optics: Germanium lens
Wavelength Range: 8 to 14 μm (corresponds to atmospheric window)
Field of View (FOV): 22° half angle

Producing Area:USA