SI-111SS infrared radiometer

With standard field of view, determine an object's surface temperature, no physical contact necessary

The SI-111SS, manufactured by Apogee, is a precision infrared radiometer that determines the surface temperature of an object without physical contact. It measures both the subject’s surface temperature and the sensor-body temperature. A Campbell Scientific data logger uses these measurements to calculate the correct temperature of the subject.

This radiometer features an IP67-rated, marine-grade 316L connector that allows the user to easily swap sensors for recalibration or to replace damaged cables.

Category:

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
Sensor Thermopile and thermistor
Input Power 2.5 V excitation (for thermistor)
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
Operating Temperature Range -55° to +80°C
Operating Relative Humidity Range 0 to 100% RH
Cable Description 4.5 m (14.76 ft) twisted, shielded 4-conductor wire with Santoprene casing, ending in pigtails
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)
Diameter 2.3 cm (0.9 in.)
Length 6 cm (2.4 in.)
Weight 190 g (6.7 oz)

Brochures: SI-111SS Infrared Radiometer with Standard Field of View

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Manuals: SI-111 and SI-111SS Precision Infrared Radiometers

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