SR20-D2

Digital secondary standard pyranometer with Modbus RTU and 4-20 mA output

Features

SR20-D2 is a solar radiation sensor of the highest category in the ISO 9060 classification system: secondary standard. SR20-D2 is designed for the solar PV industry, offering two types of commonly used irradiance outputs: digital via Modbus RTU over RS-485 and analogue 4-20 mA (current loop). These industry standards allow for easy data acquisition, easy read-out and error-free instrument exchange, when using SR20-D2. Individually tested for temperature and directional response, SR20-D2 is the most accurate digital secondary standard pyranometer available.

 

BEST PYRANOMETER FOR PV INDUSTRY

SR20-D2 is the most accurate digital secondary standard pyranometer available. Its benefits:

  • Digital output: 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 response and directional response included as required by ISO 9060
  • Re-calibration registers fully accessible to users

In order to improve overall measurement accuracy, Hukseflux effectively targeted two major sources of measurement uncertainty: calibration and “zero offset a”.
In addition, SR20-D2 has a negligible temperature response. All are best in class. The temperature response of every individual instrument is tested and corrected onboard by the instrument electronics, using a second degree polynomial. SR20-D2’s low temperature dependence makes it the ideal candidate for use under very cold and very hot conditions.

Specifications

Range
Spectral range 285...3000 nm
Accuracy
Calibration uncertainty < 1.2 % (k = 2)
ISO 9060:2018 classification class A (secondary standard)
IEC 61724-1:2017 compliance class A (when used with VU01)
Input/Output
4-20mA
Modbus RS485
Environmental
-40 to +80 °C
Sensitivity
15 x 10-6 V/(W/m2)
Approvals
WMO annex 8
Warranty
2 anni