SR300-D1 ClassA デジタル日射計

Hukseflux introduces “industrial-grade” solar radiation monitoring! The all-digital heated SR300-D1 pyranometer is engineered to measure solar radiation with the utmost reliability and measurement accuracy. SR300-D1 is the successor to our SR30-M2-D1 pyranometer, renowned worldwide as the ideal instrument for use in PV system performance monitoring.

SR300-D1 continues to provide the measurement accuracy of the SR30. It may look like it as well, but in many ways the SR300-D1 is a completely new instrument, tailored for use in PV monitoring systems.

SR300-D1 complies with – Industrial-grade – Immunity, Emission, Electrical, Environmental and Safety requirements for use in outdoor industrial environments, greatly improving measurement reliability.

Ease of operation is further enhanced through extended functionality and diagnostics.

SR300-D1 complies with IEC requirements for “Class A” PV system performance monitoring, without the need for additional accessories. It includes: 
 

• onboard heating for dew and frost mitigation
• accredited pyranometer calibration within the required uncertainty limit
• calibrated tilt sensor accurate within ± 1 ° as required for single axis tracker fault detection and pyranometer tilt measurement

SR300-D1 is tested and classified for Industrial Environments according to IEC 61326-1 and IEC 61000-6-2. When designing a measuring system, SR300-D1 users may reach several levels of immunity.

With the optional Surge Protection Device SPD01 this immunity can be increased to 4 kV. Up to 3 pyranometers can be protected with a single SPD01. A third-party SPD with similar specifications may be used instead.

To attain the required level of immunity for a given installation, some general system components should be included, such as:

•    lightning protection system
•    earthing and grounding network
•    external surge protection in addition to the native on-board sensor protection

A PV power plant is a potentially hazardous workplace environment. To comply with safety regulations, SR300-D1 features a dedicated earthing terminal for connection to protective earth. When the pyranometer is isolated from the mounting platform, it should still be properly earthed via this terminal. SR300-D1 allows system designers to comply with safety regulations. These are often based on EU and US electrical safety standards such as:

•    EN-50110 Operation of Electrical Installations
•    NFPA 70 National Electrical Code (NEC)

For PV systems with single-axis trackers, IEC 61724-1:2021 Class A systems also require a tilt angle measurement. The sensor used for this is an accelerometer. Every SR300-D1 accelerometer is individually calibrated, and temperature compensated from -30 to +50 °C, resulting in a high accuracy measurement in compliance with the required accuracy of ± 1 °. The acceleration components x, y and z can separately be read out to provide additional information about the instrument orientation.

SR300-D1 includes a heater. Heating mitigates dew and frost, leading to high data availability.

SR300-D1 can be operated in 3 power modes. Overall performance in all 3 modes complies with ISO 9060 Class A classification criteria. This allows users to conserve power and continue the measurement, also when the system operating power is limited.

•    normal, < 3 W heated / ventilated for optimal dew and frost mitigation
•    medium, < 1 W unheated / ventilated for high accuracy measurement, when dew and frost are not an issue 
•    low, < 0.5 W unheated / unventilated to save power

Heating counters frost and dew deposition. In the picture on the right you see a clear difference between a heated and non-heated pyranometer.

In addition to solar irradiance, SR300-D1 outputs several alerts and measurements for remote use, most importantly:

•    alert: instrument leakage 
•    alert: change of tilt and rotation
•    alert: heating malfunction
•    internal humidity
•    internal pressure
•    instrument tilt and rotation

Remote diagnostics reduces the need for (un)scheduled field inspection.

The status LED provides visual feedback to a local operator. On-site, users have immediate information on instrument power and data traffic. This is especially useful during installation and field inspections.