SR300-D1 Pyranometer

Options

We offer accessories for use with the SR300-D1, including electrical and mounting hardware options.
• SPD01 Surge Protection Device (for 1 to 3 instruments) for cables longer than 3 meters and to upgrade surge protection to Level 4
• PID01 Pyranometer Isolation Disk, which electrically isolates the instrument from the mounting platform, spring-loaded for easy leveling
• LM01 Spring-loaded Leveling Stand; a handy stand for easy mounting, leveling, and exchanging instruments on flat surfaces
• TLM01 Pipe Leveling Stand with a set of bolts
• Calibration Certificate including customer name and contact information
• DP01 Dome Guard, 5-piece set
• AMF03 Albedometer Attachment

• PMF01 and PFM02 Mounting Accessories

SR300-D1 – “Industrial Grade” Solar Radiation Monitoring¡
Hukseflux introduces “industrial grade” solar radiation monitoring. The fully digital heated pyranometer SR300-D1 is designed to measure solar radiation with the highest reliability and measurement accuracy. The SR300-D1 is the successor to our SR30-M2-D1 pyranometer, which is globally recognised as the ideal instrument for use in monitoring the performance of photovoltaic systems.

The SR300-D1 still offers the measurement accuracy of the SR30. It may look like it, but in many ways the SR300-D1 is a completely new instrument, custom-designed for use in photovoltaic monitoring systems.
The SR300-D1 meets industrial grade requirements for immunity, emissions, electricity, environment and safety for use in outdoor industrial environments, greatly improving measurement reliability.
Ease of use is further enhanced with expanded features and diagnostics. Monitoring PV Systems with the SR300-D1 Industrial Pyranometer

Monitoring PV System Performance – Meets IEC 61724-1 Class A

The SR300-D1 meets IEC requirements for monitoring the performance of “Class A” PV systems, with no additional accessories required. Features:
Built-in heater for dew and frost mitigation
Accredited pyranometer calibration within required uncertainty limit
Tilt sensor calibrated to ±1° accuracy, as required for single-axis tracker fault detection and pyranometer tilt measurement

Immunity to High Voltages and Currents – Surge
The SR300-D1 is tested and rated for industrial environments in accordance with IEC 61326-1 and IEC 61000-6-2. When designing a measurement system, SR300-D1 users can achieve various levels of immunity.

Using the optional SPD01 surge protection device, 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 can be used instead.

To achieve the required immunity level for a given installation, some general system components must be included, such as:
• lightning protection system
• grounding network
• external surge protection in addition to the native protection of the integrated sensor

RS-485 Isolation
The RS-485 interface of the industrial pyranometers is galvanically isolated from the internal electronics and the instrument body. Both isolation barriers are rated at 1.5 kV. This contributes to reliable operation, flexibility in system design, and lower integration costs for all industrial pyranometers.

Electrical Safety in the Workplace
A photovoltaic power plant is a potentially hazardous work environment. To comply with safety regulations, the SR300-D1 features a dedicated grounding terminal for protective earth connection. When the pyranometer is isolated from the mounting platform, it must still be properly grounded through this terminal. The SR300-D1 enables system designers to comply with safety regulations. These are typically 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 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.
Heated pyranometer that mitigates dew and frost

Heated for high data availability, operation in 3 power modes
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.

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

On-site diagnostics: status LED

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.