Apogee SIF-121-SS – Research-Grade High Speed, Narrow Field of View Infrared Radiometer

The SIF-121-SS is a fast response model infrared radiometer with a 0.2 second response time. The analog sensor is un-amplified and has a voltage output and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor has a 18° half-angle field of view. Typical applications include plant canopy temperature measurement for use in plant water status estimation, phenotyping, phenomics, road surface temperature measurement of determination of icing conditions, and terrestrial surface (soil, vegetation, water, snow) temperature measurement in energy balance studies. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration. The SIF-121-SS is designed to be mounted with an Apogee AM-250 commercial-grade mounting bracket.

FOR MORE PRODUCT INFORMATION, CHECK OUT THESE LINKS

• Product Manual

• Specification Sheet

• Technical Drawing

Approximate Sensitivity
10 µV per C

Output from Thermopile
Approximately -0.55 to 0.55 mV for a temperature difference from -55 to 55 C

Output from Thermistor
2500 mV excitation (typical, other voltages can be used)

Input Voltage Requirement
0 to 2500 mV (typical, depends on input voltage)

Calibration Uncertainty (-30 to 65 C)
0.2 C

Calibration Uncertainty (-40 to 80 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 clean condition

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

Field of View
18˚ 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

Mass190 g (with 5 m of lead wire)

Cable
5 m of shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions), additional cable available

Warranty
4 years against defects in materials and workmanship

Manufactured
Made in the USA