Digital secondary standard albedometer

SRA30-M2-D1 digital spectrally flat Class A albedometer is an instrument that measures global and reflected solar radiation and the solar albedo, or solar reflectance. SRA30-M2-D1 is the most accurate albedometer available and heated for the best data availability. It is composed of one AMF03 albedometer mounting kit and two SR30-M2-D1 spectrally flat Class A (previously “secondary standard”) pyranometers. This pyranometer is compliant in its standard configuration with the requirements for Class A PV monitoring systems of the IEC 61724-1:2017 standard. Each pyranometer has a thermopile sensor, the up-facing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. AMF03 includes one glare screen, one mounting fixture with a rod, mounting hardware, and tools. The modular design facilitates maintenance and calibration.

  • the most accurate albedometer
  • compliant with requirements for Class A PV monitoring systems
  • heated for high data availability, featuring RVH technology
  • modular design of SRA30 facilitates maintenance and calibration


Digital Albedometer

SRA30-M2-D1 design

SRA30-M2-D1 consists of two identical pyranometers model SR30-M2-D1, one facing up, and one facing down. To create an SRA30-M2-D1, the two sensors are combined with one AMF03 albedometer mounting kit. AMF03 includes a fixture with a rod for mounting purposes and a glare screen. The user assembles these modular components into an SRA30 albedometer. Mounting hardware, tools, mounting, and fixation instruction are part of AMF03. The modular design of SRA30 facilitates maintenance and calibration.

The best Digital Albedometer for the PV industry

SRA30-M2-D1 is the most accurate albedometer available. Its benefits:

  • Heating and ventilation included, complying with IEC 61724-1 Class A PV system requirements
  • Digital outputs: easy implementation & servicing
  • Best-in-class temperature response < ± 0.4 % (-30 to +50 °C), best “zero offset a” and best calibration uncertainty
  • Test certificates for temperature- and directional response are included as required by ISO 9060
  • Re-calibration registers are fully accessible to users
  • Modular; can be calibrated as separate pyranometers

Using the SRA30 albedometer is easy

The instrument is composed of two SR30 spectrally flat Class A pyranometers; the up-facing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. When using SR30, the irradiance in W/m² is transmitted via the Modbus protocol over 2-wire RS-485. The working principle and specifications of the pyranometers can be found in the SR30 user manual. SRA30 can be connected directly to commonly used data logging systems.


Albedometers are used for general meteorological observations, building physics, roof reflectance studies, climate studies, and solar collector testing. A common application is for outdoor solar radiation balance measurements as part of a meteorological station. Albedometers are increasingly popular in bifacial PV module performance monitoring. This application requires horizontal leveling; a bubble level and a mounting rod are included. Each SR30-M2-D1 pyranometer includes a tilt sensor.

Heated for high data availability, featuring RVH technology

High data availability is attained by heating of the outer dome using ventilation between the inner and outer dome. RVH – Recirculating Ventilation and Heating – technology, developed by Hukseflux, suppresses dew and frost deposition and is as effective as traditional ventilation systems, without the maintenance hassle and large footprint.




Suggested Use

  • PV monitoring with Bifacial solar modules
  • High-accuracy meteorological observations
  • Building physics, roof reflectance studies
  • Extreme climates (tropical / polar)

Areas of Application

Meteorology / surface energy flux measurement
Solar energy / PV system performance monitoring






global solar radiation and reflected solar radiation

Optional measurand

albedo or solar reflectance ,net solar radiation

SRA30-M2-D1 specifications



2 x SR30-M2-D1, 1 x AMF03

IEC 61724-1 compliance

meets Class A and B PV monitoring system requirements

Calibration uncertainty

< 1.2 % (k = 2)






mounting rod with 15 x 10⁻³ m diameter

Rated operating temperature

-40 to +80 °C range



Included sensors

2 x identical ISO 9060 spectrally flat Class A pyranometer SR30-M2-D1

Temperature response

< ± 0.4 % (-30 to +50 °C)

Temperature response test and directional response test

reports included

Power consumption

< 3 W at 12 VDC

Standard cable length

5 m (see options)

Digital output



irradiance in W/m²; instrument body temperature in ° C; tilt angle in °; internal humidity in %; ventilator speed in RPM

Communication protocol


Transmission mode


Hardware interface

2-wire (half duplex) RS-485

Rated operating voltage range

8 to 30 VDC



Included parts

1 x glare screen; 1 x AMF03 fixture with rod; 1 x conical positioner; 2 x M5x12 socket head cap screw; 1 x M6x8 socket head cap screw, 2 x M8x12 set screw, 1 x mounting and fixation instruction sheet


longer cables, in multiples of 5 m


SRA30-M2-D1 albedometer brochure

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