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SN-522 Modbus Net Radiometer

Updated:2025-03-13

Brand:APOGEE
Model: SN-522
Description: Apogee Instruments' new four-component net radiometer provides individual measurement of net radiation components. The sensor features a Modbus RS-232 or RS-485 output, eliminating the need for multip
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Product Details

SN-522-SS Modbus Net Radiometer Introduction：

user's manual

Apogee Instruments' new four-component net radiometer provides individual measurement of net radiation components. The sensor features a Modbus RS-232 or RS-485 output, eliminating the need for multiple analog channels to measure the individual components of net radiation. The net radiometer comes as a complete package that includes net radiometer, mounting rod, pigtail lead cable for datalogger interface, and carrying case.

Advantages of SN-522 MODBUS Network Radiometer:

Onboard A/D Conversion and Modbus Output

Apogee net radiometers feature onboard A/D conversion and Modbus output to eliminate the requirement of multiple analog datalogger channels.

Four-component Net Radiometer

An upward-looking and downward-looking pyranometer, and an upward-looking and downward-looking pyrgeometer provide separate measurements of the four components of net radiation.

Individually Heated Radiometers

Each radiometer includes an individual heater to increase accuracy by minimizing the influence of dew/frost on the filter.

Compact and Light Weight

Designed to be light weight and small in size to facilitate easy mounting.

SN-522 Technical Drawing：

SN-522 Specifications:

Input Voltage Range	5.5 to 24 V DC (heaters are optimized to run at 12 V DC)
Output	RS-232 or RS-485
Current Draw (12 V DC Supply Voltage)	Heaters on: 72 mA; Heaters off: 13.5 mA
Response Time	It takes 750 ms to digitize all detector signals
Heaters (sensors individually heated)	62 mA current drain and 740 mW power requirement at 12 V DC
Operating Environment	-50 to 80 C; 0 to 100 % relative humidity
Dimensions	116 mm length, 45 mm width, 66 mm height
Mass	320 g (with mounting rod and 5 m of lead wire)
Cable	M8 connector (IP68 rating) to interface to sensor housing, 5 m of four conductor shielded, twisted-pair wire in a santoprene rubber jacket with pigtail lead wires
Manufactured	Made in the USA
Pyrgeometer	Specifications
Pyrgeometer Sensitivity	0.12 mV per W mˉ2 (variable from sensor to sensor, typical value listed)
Pyrgeometer Calibration Factor (Reciprocal of Sensitivity)	8.5 W mˉ2 (variable from sensor to sensor, typical value listed)
Pyrgeometer Calibration Uncertainty	± 5 %
Pyrgeometer Output Ranges	-24 to 24 mV
Pyrgeometer Measurement Range	-200 to 200 W mˉ2 (net longwave irradiance)
Pyrgeometer Measurement Repeatability	Less than 1 %
Pyrgeometer Long-term Drift	Less than 2 % change in sensitivity per year
Pyrgeometer Non-linearity	Less than 1 %
Pyrgeometer Detector Response Time	Less than 0.5 s
Pyrgeometer Field of View	150?
Pyrgeometer Spectral Range	5 to 30 μm
Pyrgeometer Temperature Response	Less than 5 % from -15 to 45 C
Pyrgeometer Window Heating Offset	Less than 10 W mˉ2
Pyrgeometer Zero Offset B	Less than 5 W mˉ2
Pyrgeometer Tilt Error	Less than 0.5 %
Pyrgeometer Uncertainty in Daily Total	± 5 %
Pyrgeometer Temperature Sensor	30 kΩ thermistor, ± 1 C tolerance at 25 C
Pyrgeometer Output from Thermistor	0 to 2500 mV (typical, other voltages can be used)
Pyrgeometer Input Voltage Requirement for Thermistor	2500 mV excitation (typical, other voltages can be used)
Pyranometer	Specifications
Pyranometer Sensitivity	0.045 mV per W mˉ2 (upward-looking); 0.035 mV per W mˉ2 (downward-looking), (variable from sensor to sensor, typical values listed)
Pyranometer Calibration Factor (Reciprocal of Sensitivity)	22 W mˉ2 per mV (upward-looking); 28.5 W mˉ2 per mV (downward-looking)
Pyranometer Calibration Uncertainty	Less than 3 % at 1000 W mˉ2
Pyranometer Output Range	0 to 90 mV (upward-looking); 0 to 70 mV (downward-looking)
Pyranometer Measurement Range	0 to 2000 W mˉ2 (net shortwave irradiance)
Pyranometer Measurement Repeatability	Less than 1 %
Pyranometer Long-term Drift	Less than 2 % per year
Pyranometer Non-linearity	Less than 1 %
Pyranometer Detector Response Time	0.5 s
Pyranometer Field of View	180? (upward-looking); 150? (downward-looking)
Pyranometer Spectral Range	385 nm to 2105 nm (upward-looking); 295 nm to 2685 nm (downward-looking)
Pyranometer Directional (Cosine) Response	Less than 30 W mˉ2 at 80? solar zenith (upward-looking); Less than 20 % for angles between 0 and 60? (downward-looking)
Pyranometer Temperature Response	Less than 5 % from -15 to 45 C
Pyranometer Zero Offset A	Less than 5 W mˉ2; Less than 10 W mˉ2 (heated)
Pyranometer Zero Offset B	Less than 5 W mˉ2
Pyranometer Uncertainty in Daily Total	Less than 5 %