Class C pyranometer SR05-LI19

analogvoltage outputportable

SR05-LI19 is a portable pyranometer system combining the SR05-A1 solar radiation sensor with the LI19 handheld read-out unit/data logger. It provides a compact, transportable solution for mobile field measurements and short-term data logging, converting sensor output to W/m² for immediate reading and storage.

Key features

• Portable system: SR05-A1 pyranometer supplied together with LI19 handheld read-out unit and transport case.
• Complies with ISO 9060:2018 spectrally flat Class C (moderate quality) for hemispherical solar radiation measurements.
• SR05-A1 provides analog millivolt (mV) output; LI19 offers display, 16-bit A/D conversion and internal data storage.
• LI19 can be pre-programmed for immediate use and accepts sensitivity programming via PC interface.

Applications / usage notes

• Suitable for general solar radiation observations (hemispherical, 180° field of view).
• Can be mounted horizontally, tilted (plane-of-array) or inverted for reflected radiation measurements.
• Usable under natural sunlight and lamp-based solar simulators.
• Designed primarily for mobile field campaigns, education, demonstrations and short-term logging; LI19 is compatible with other pyranometers and heat flux sensors when configured.

Technical specifications

• Measurand: hemispherical solar radiation (W/m²).
• ISO 9060:2018 classification (SR05-A1): spectrally flat Class C.
• ISO 9060:1990 equivalent: second class pyranometer.
• Compliance: IEC 61724-1:2021 Class B system.
• WMO performance level: moderate quality pyranometer.
• Calibration uncertainty: < 2.4 % (k = 2).
• Calibration traceability: to WRR.
• Spectral range (SR05): 285 to 3000 × 10⁻⁹ m.
• Sensitivity (nominal, SR05): 10 × 10⁻⁶ V/(W/m²).
• Output (SR05-A1): analog millivolt (mV).
• Standard cable length (SR05): 3 m.
• Rated operating temperature range (SR05): -40 to +80 °C.
• Temperature response (SR05): < ±3 % (from -10 to +40 °C).
• Heating: none (SR05 has no heater).
• Tilt sensor: none.
• LI19 display output: solar radiation in W/m² when SR05 sensitivity is programmed.
• LI19 stored measurement definition: minimum, maximum and average over storage interval with conversion to W/m².
• LI19 A/D conversion: 16 bits.
• LI19 temperature dependence: < 0.5 % + 3×10⁻⁶ V over rated range.
• LI19 display refresh rate: 1 s⁻¹.
• LI19 battery type: 2 × AA; battery life > 50 days on fresh batteries.
• LI19 storage interval range: 2 to 65535 s (selectable); storage capacity: 3518 measurements.
• LI19 rated operating temperature range: -10 to +40 °C.