Class A pyranometer SR15-D2A2

analogdigitalModbus

Overview
SR15 digital pyranometer series is an all-digital range of solar radiation sensors applied in general high-accuracy observations. SR15 pyranometers comply with the “first class” specifications according to the ISO 9060:1990 standard and “spectrally flat class B” requirements in the 2018 revision. Version SR15-D2A2 offers Modbus over TTL, and 4–20 mA current loop output.

Key features
• Class B performance: complies with “spectrally flat class B” requirements in the ISO 9060:2018 revision and “first class” specifications according to the ISO 9060:1990 standard, meeting IEC 61724-1:2021 Class B system compliance.
• Dual output options: offers digital communication with Modbus RTU protocol over TTL hardware interface and an analog 4-20 mA current loop output.
• Improved measurement accuracy: latest calibration method results in an uncertainty of the sensitivity of 1.8 %, compared to typical uncertainties of higher than 2.8 % for this pyranometer class.
• Improved response time: response time is < 10 s, a significant improvement relative to earlier sensors and competitors.
• Sunshine duration capability: WMO has approved the “pyranometric method” to calculate sunshine duration from pyranometer measurements in WMO-No. 8, Guide to Meteorological Instruments and Methods of Observation, allowing SR15 to be used in combination with appropriate software to estimate sunshine duration cost-effectively.
• Digital parameter output: digital output provides irradiance in W/m² and instrument body temperature in °C.

Applications
• PV system performance monitoring (commercial, utility scale, and small sized).
• General solar resource monitoring.
• Indoor simulated solar testing.
• Meteorological networks and National Meteorological Networks / meteorology/climatology.

Specifications
• Measurand: hemispherical solar radiation [W/m²]
• ISO 9060:2018 classification: spectrally flat Class B
• ISO 9060:1990 classification: first class pyranometer
• Compliance: IEC 61724-1:2021 Class B system
• Calibration uncertainty: < 1.8 % (k = 2)
• Calibration traceability: to WRR
• Spectral range: 285 to 3000 x 10⁻⁹ m
• Response time: < 10 s
• Zero offset a: 5 W/m² unventilated
• Rated operating temperature range: -40 to +80 °C
• Temperature response (-10 to +40 °C): < ± 2 %
• Communication protocol: Modbus
• Transmission mode: RTU
• Hardware interface: TTL
• Analog output: 4-20 mA
• Digital output: irradiance in W/m² and instrument body temperature in °C
• Standard cable length: 5 m
• Leveling: optional spring-loaded leveling, with or without tube mount
• Heating: no
• Tilt sensor: no

Available options and accessories
Cable length options:

• No cable
• 3 m (9.8 ft)
• 5 m (16.4 ft)
• 10 m (32.8 ft)
• 20 m (65.6 ft)
• 30 m (98.4 ft)
• 50 m (164 ft)
• 70 m (229 ft)
• 100 m (328 ft)
• 130 m (426 ft)

Mounting hardware options:

• AMF03 - Albedometer mounting plate for 2 pyranometers (used to mount two pyranometers - one up one down for albedo)
• PMF01 - GHI mounting plate for 1-2.3 inch crossarms
• TLM01 - Ball leveling mount for 1-1.57 inch crossarms

Surge protection options:

• No surge protection
• SurgeSplitter - Industrial surge protection device for up to 2 pyranometers