	SI-111	SI-121	SI-131	SI-1H1	SIF-111	SIF-121	SIF-1H1
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)
Calibration Uncertainty (-30 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
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
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
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
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
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
Operating Environment	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)
Mass	190 g	190 g	190 g	190 g	190 g	190 g	190 g

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

Thermistor Input Voltage Requirement

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

Analog Output from Thermistor

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

Calibration Uncertainty (-30 to 65 C), when target and detector ΔT are < 20 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

0.6 C

0.5 C

Measurement Repeatability

Less than 0.05 C

Response Time (time for detector signal to reach 95 % following a step change)

0.6 s

0.2 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

Spectral Range

8 to 14 µm atmospheric window

Operating Environment

-50 to 80 C, 0 to 100 % relative humidity (non-condensing)

Mass

190 g

	SI-411	SI-421	SI-431	SI-4H1	SI-4HR	SI-511	SI-521	SI-531	SI-5H1	SI-5HR
Digital Input Voltage Requirement	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC	5.5 to 24 V DC
Average Current Draw	1.5 mA (quiescent), 2.0 mA (active)	1.5 mA (quiescent), 2.0 mA (active)	1.5 mA (quiescent), 2.0 mA (active)	1.5 mA (quiescent), 2.0 mA (active)	1.5 mA (quiescent), 2.0 mA (active)	RS-232 quiescent 37 mA, active 37 mA; RS-485 quiescent 37, active 42 mA	RS-232 quiescent 37 mA, active 37 mA; RS-485 quiescent 37, active 42 mA	RS-232 quiescent 37 mA, active 37 mA; RS-485 quiescent 37, active 42 mA	RS-232 quiescent 37 mA, active 37 mA; RS-485 quiescent 37, active 42 mA	RS-232 quiescent 29 mA; RS-485 30 mA
Calibration Uncertainty (-30 to 65 C), when target and detector ΔT are < 20 C	0.2 C	0.2 C	0.3 C	0.2 C	0.3 C	0.2 C	0.2 C	0.3 C	0.2 C	0.5 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	0.6 C	0.5 C	1 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
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	0.6 s	-	-	-	-	-
Field of View	22° half-angle	18° half-angle	14° half-angle	32° horizontal half-angle, 13° vertical half-angle	16° horizontal half-angle, 5° vertical half-angle	22° half-angle	18° half-angle	14° half-angle	32° horizontal half-angle, 13° vertical half-angle	16° horizontal half-angle, 5° 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
Operating Environment	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)	-50 to 80 C, 0 to 100 % relative humidity (non-condensing)
Mass	190 g	190 g	190 g	190 g	219 g	190 g	190 g	190 g	190 g	219 g

Digital Input Voltage Requirement

5.5 to 24 V DC