Apogee SIL-111: Standard Field of View Commercial Infrared Radiometer Sensor

The SIL-111 is an unamplified analog sensor with a voltage output and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor has a 22° half-angle field of view and a response time of 0.6 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.

FOR MORE PRODUCT INFORMATION, CHECK OUT THESE LINKS

• Product Manual

• Specification Sheet

• Technical Drawing

Approximate Sensitivity
50 µV per C difference between target and detector temperature

Output from Thermopile
Approximately -3.3 to 3.3 mV for a temperature difference from -55 to 55 C

Output from Thermistor
0 to 2500 mV (typical, depends on input voltage)

Input Voltage Requirement
2500 mV excitation (typical, other voltages can be used)

Calibration Uncertainty (0 to 50 C), when target and detector temperature are within 20 C
0.5 C

Measurement Repeatability
Less than 0.05 C

Stability (Long-term Drift)
Less than 2 % change in slope per year when germanium filter is maintained in a clean condition

Response Time
0.6 s, time for detector signal to reach 95 % following a step change

Field of View
22° half angle

Spectral Range
8 to 14 µm; atmospheric window

Operating Environment
-50 to 80 C; 0 to 100 % relative humidity (non-condensing)

Dimensions
23 mm diameter, 60 mm length

Mass
190 g (with 5m of lead wire)

Cable
5 m of six conductor, shielded, twisted-pair wire; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires

Warranty
4 years against defects in materials and workmanship