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SL-610: Pyrgeometer Downward-Looking

Updated:2025-03-13

Brand: APOGEE
Model:SL-610
Description: The SL-610 is a downward-looking thermopile pyrgeometer. The sensor incorporates a filter, blackbody thermopile detector, and thermistor with a rugged, self-cleaning sensor housing design, and high-qu
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Product Details

SL-610: Pyrgeometer Downward-Looking overview：

user manual

The SL-610 is a downward-looking thermopile pyrgeometer. The sensor incorporates a filter, blackbody thermopile detector, and thermistor with a rugged, self-cleaning sensor housing design, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include longwave radiation measurement in agricultural, ecological, and hydrological weather networks and renewable energy applications. Sensor includes IP68 marine-grade stainless-steel cable connector 25 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

SL-610 drawing：

SL-610 specification:

Sensitivity	0.12 mV per W mˉ2 (variable from sensor to sensor, typical value listed)
Calibration Factor (Reciprocal of Sensitivity)	8.5 W mˉ2 per mV (variable from sensor to sensor, typical value listed)
Calibration Uncertainty	± 5 %
Measurement Range	-200 to 200 W mˉ2 (net longwave irradiance)
Measurement Repeatability	Less than 1 %
Long-term Drift	Less than 2 % change in sensitivity per year
Non-linearity	Less than 1 %
Detector Response Time	Less than 0.5 s
Field of View	150?
Spectral Range	5 to 30 μm
Temperature Response	Less than 5 % from -15 to 45 C
Window Heating Offset	Less than 10 W mˉ2
Zero Offset B	Less than 5 W mˉ2
Tilt Error	Less than 0.5 %
Uncertainty in Daily Total	± 5 %
Temperature Sensor	30 kΩ thermistor, ± 1 C tolerance at 25 C
Output from Thermistor	0 to 2500 mV (typical, other voltages can be used)
Input Voltage Requirement for Thermistor	2500 mV excitation (typical, other voltages can be used)
Heater	780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DC
Dimensions	27.5 mm height, 23.5 mm diameter
Mass	100 g
Warranty	4 years against defects in materials and workmanship
Manufactured	Made in the USA