Apogee Instruments SIF-111, Owner'S Manual

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SPECIFICATIONS
Calibration Traceability
Apogee SIF series infrared radiometers are calibrated to the temperature of a custom blackbody cone held at
multiple fixed temperatures over a range of radiometer (detector/sensor body) temperatures. The temperature of
the blackbody cone is measured with replicate precision thermistors thermally bonded to the cone surface. The
precision thermistors are calibrated for absolute temperature measurement against a platinum resistance
thermometer (PRT) in a constant temperature bath. The PRT calibration is directly traceable to the NIST.
SIF-111-SS SIF-121-SS SIF-1H1-SS
Approximate Sensitivity
(difference between target and detector
temperature)
15 µV per C 10 µV per C
Output from Thermopile
Approximately -0.825 to
0.825 mV for at
temperature difference
from -55 to 55 C
Approximately -0.55 mV to 0.55 mV for a
temperature difference from -55 to 55 C
Analog 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 (-30 to 65 C), when
target and detector temperature are within 20 C
0.2 C
Calibration Uncertainty (-40 to 80 C), when
target and detector temperate are different by
more than 20 C
(see Calibration Traceability below)
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 (see Maintenance and Recalibration section below)
Response Time 0.2 s, time for detector signal to reach 95 % following a step change
Field of View 22° half-angle 18° half-angle
32° horizontal half-
angle; 13° vertical
half-angle
Spectral Range 8 to 14 µm; atmospheric window (see Spectral Response below)
Operating Environment -50 s 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 four conductor, shielded, twisted-pair wire; TPR jacket (high water
resistance, high UV stability, flexibility in cold conditions); pigtail lead wires;
stainless steel (316), M8 connector located 25 cm from sensor head
Warranty 4 years against defects in materials and workmanship