Campbell Scientific SI-111 (IRR-P) Precision Infrared Radiometer - Manual (Page 7)

SI-111 Precision Infrared Radiometer
Prior to November 2008, the SI-111 was named the IRR-P. Only
the name changed. NOTE
1. General Description
The SI-111 is an infrared temperature sensor that provides a non-contact means
of measuring the surface temperature of an object. It senses the infrared
radiation being emitted by the target. The SI-111 can be widely used for
measurements of leaf, canopy, and average surface temperature. With contact
sensors, it is difficult to avoid influencing the temperature, maintain thermal
contact, and provide a spatial average.
By mounting the infrared sensor at an appropriate distance from the target, it
can be used to measure an individual leaf, a canopy, or any surface of interest.
The SI-111 is an infrared temperature sensor that includes a thermopile for
measuring a millivolt output dependent on the target to sensor body
temperature difference. A thermistor measures the temperature of the sensor
body. The sensor body temperature is used to reference the target temperature.
2. 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
Mass: 190 grams
Dimensions: 6.3 cm long by 2.3 cm diameter
Response Time: Less than 1 second to changes in target
temperature
Target 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 micrometers
Field of View: 22° half angle
Operating
Environment: Highly water resistant, designed for
continuous outdoor use; operating range is
–55° to 80°C, 0 to 100% RH
* Where target temperature is within 20°C of sensor body temperature.
** Where target temperature is greater than 20°C of sensor body temperature.
1