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SR25 — HuksefluxUSA

Updated:2025-03-13

Brand: Hukseflux
Model：SR25
Description: SR25 takes solar radiation measurement to the next level. Using a sapphire outer dome, it has negligible zero offsets. SR25 is heated in order to suppress dew and frost deposition, maintaining its hig
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Product Details

SR25 — HuksefluxUSA： User's Manual Datasheet

Best Data Availability

By keeping the SR25 outer dome free of dew and frost with help of the internal heater, data availability is highly increased over traditional pyranometers, whether these are ventilated or not. The application photo shows the clear difference between SR25 versus a non-heated pyranometer without sapphire dome.

Best Measurement Accuracy

SR25 measures the solar radiation received by a plane surface, in W/m², from a 180 ° field of view angle. SR25 offers the best measurement accuracy: the specification limits of two major sources of measurement uncertainty have been greatly improved over competing pyranometers: “zero offset a” and temperature response.

SR25 Design

SR25 has a sapphire outer dome, glass inner dome and an internal heater. It employs a state-of-the-art thermopile sensor with black coated surface and an anodized aluminum body. The connector, desiccant holder and sun screen fixation are very robust and designed for long term use.

Suggested Use

measurements

All situations where ventilated pyranometers are employed

PV system performance monitoring

Indoor PV testing with solar simulators

Airborne measurements

Diffuse measurements

Environments with dew

Environments with frost

Areas of Application

Meteorology / surface energy flux measurement

Solar energy / PV system performance monitoring

SR25 — HuksefluxUSA Specifications：

Measurand	hemispherical solar radiation
ISO 9060:2018 classification	spectrally flat Class A (secondary standard)
IEC 61724-1:2017 compliance	Class B
Application	National Meteorological NetworksPV monitoring commercial and utility scale, meteorology / climatology, other
Heater	yes
Output	mV
Zero offset a	1 W/m² unventilated
Calibration traceability	to WRR
Spectral range	285 to 3000 x 10⁻⁹ m
Sensitivity (nominal)	15 x 10⁻⁶ V/(W/m²)
Rated operating temperature range	-40 to +80 °C
Temperature response	<± 1 % (-10 to +40 °C), <± 0.4 % (-30 to +50 °C) with correction in dataprocessing
Temperature response test of individual instrument	report included
Directional response test of individual instrument	report included
Temperature sensor	Pt100 or 10 kΩ thermistor
Standard cable length	5 m
Version order codes	SR25-T1, SR25-T2
Options	longer cable, in multiples of 5 metres