	SI-111	SI-121	SI-131	SI-1H1	SIF-111	SIF-121	SIF-1H1	SI-411	SI-421	SI-431	SI-4H1
Analog Model Output (Difference between Target and Detector)	60 µV per C	40 µV per C	20 µV per C	40 µV per C	15 µV per C	10 µV per C	10 µV per C	-	-	-	-
Thermistor Input Voltage Requirement	2500 mV excitation (typical, other voltages can be used)	2500 mV excitation (typical, other voltages can be used)	2500 mV excitation (typical, other voltages can be used)	2500 mV excitation (typical, other voltages can be used)	2500 mV excitation (typical, other voltages can be used)	2500 mV excitation (typical, other voltages can be used)	2500 mV excitation (typical, other voltages can be used)	-	-	-	-
Analog Output from Thermistor	0 to 2500 mV (typical, depends on input voltage)	0 to 2500 mV (typical, depends on input voltage)	0 to 2500 mV (typical, depends on input voltage)	0 to 2500 mV (typical, depends on input voltage)	0 to 2500 mV (typical, depends on input voltage)	0 to 2500 mV (typical, depends on input voltage)	0 to 2500 mV (typical, depends on input voltage)	-	-	-	-
Digital Input Voltage Requirement	-	-	-	-	-	-	-	4.5 to 24 V DC with current drain of 0.6 mA (quiescent), 1.3 mA (active)	4.5 to 24 V DC with current drain of 0.6 mA (quiescent), 1.3 mA (active)	4.5 to 24 V DC with current drain of 0.6 mA (quiescent), 1.3 mA (active)	4.5 to 24 V DC with current drain of 0.6 mA (quiescent), 1.3 mA (active)
Calibration Uncertainty (-20 to 65 C), when target and detector ΔT are < 20 C	0.2 C	0.2 C	0.3 C	0.2 C	0.2 C	0.2 C	0.2 C	0.2 C	0.2 C	0.3 C	0.2 C
Calibration Uncertainty (-40 to 80 C), when target and detector ΔT are > 20 C	0.5 C	0.5 C	0.6 C	0.5 C	0.5 C	0.5 C	0.5 C	0.5 C	0.5 C	0.6 C	0.5 C
Measurement Repeatability	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C	Less than 0.05 C
Response Time (time for detector signal to reach 95 % following a step change)	0.6 s	0.6 s	0.6 s	0.6 s	0.2 s	0.2 s	0.2 s	0.6 s	0.6 s	0.6 s	0.6 s
Field of View	22 ° half-angle	18 ° half-angle	14 ° half-angle	32 ° horizontal half-angle, 13 ° vertical half-angle	22 ° half-angle	18 ° half-angle	32 ° horizontal half-angle, 13 ° vertical half-angle	22 ° half-angle	18 ° half-angle	14 ° half-angle	32 ° horizontal half-angle, 13 ° vertical half-angle
Spectral Range	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window	8 to 14 µm atmospheric window
Operating Environment	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)	-55 to 80 C, 0 to 100 % relative humidity (non-condensing)
Mass (with 5 m cable)	190 g	190 g	190 g	190 g	190 g	190 g	190 g	190 g	190 g	190 g	190 g