SR300-D1 Industrial Pyranometer with Heater and Tilt Sensor

SR300-D1: Industrial-grade Solar Radiation Monitoring

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 similar, 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.

PV System Performance Monitoring: IEC 61724-1 Class A Compliant

The SR300-D1 meets IEC requirements for "Class A" PV system performance monitoring without the need for additional accessories. It features:

• Onboard heating for dew and frost mitigation
• Accredited pyranometer calibration within the required uncertainty limit
• Calibrated tilt sensor accurate within ± 1°, essential for single-axis tracker fault detection and pyranometer tilt measurement

Immunity to High Voltages and Currents - Surges

The SR300-D1 is tested and classified for industrial environments according to IEC 61326-1 and IEC 61000-6-2. It offers several levels of immunity when designing a measuring system.

With the optional Surge Protection Device SPD01, this immunity can be increased to 4 kV. A single SPD01 can protect up to 3 pyranometers. A third-party SPD with similar specifications may also be used.

To achieve the required level of immunity for a given installation, it is essential to include general system components such as:

• Lightning protection system
• Earthing and grounding network
• External surge protection in addition to the native on-board sensor protection

Electrical Safety in the Workplace

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

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

Tilt Angle Measurement

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

Heated for High Data Availability, Operation in 3 Power Modes

The SR300-D1 includes a heater to mitigate dew and frost, ensuring high data availability. It operates in three power modes, all of which comply with ISO 9060 Class A classification criteria. This feature allows users to conserve power and continue measurements even when 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 effectively counters frost and dew deposition. The difference between a heated and non-heated pyranometer is clearly visible in the accompanying image.

Remote Diagnostics

In addition to solar irradiance, the 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 inspections.

On-site Diagnostics: Status LED

The status LED provides visual feedback to a local operator, offering immediate information on instrument power and data traffic. This feature is particularly valuable during installation and field inspections, enhancing operational efficiency.