LP02-TR pyranometer

Second class pyranometer with 4-20 mA transmitter

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LP02-TR is a solar radiation sensor that is applied in most common solar radiation observations. The pyranometer houses a 4-20 mA transmitter for easy read-out by dataloggers commonly used in the industry. It complies with the second class specifications of the ISO 9060 standard and the WMO Guide. LP02-TR pyranometer is widely used in (agro-)meteorological applications and for PV system performance monitoring.

LP02-TR measures the solar radiation received by a plane surface from a 180o field of view angle. This quantity, expressed in W/m2 , is called “hemispherical” solar radiation. The pyranometer can be employed outdoors under the sun, as well as indoors with lamp-based solar simulators. Its orientation depends on the application and may be horizontal, tilted (for plane of array radiation) or inverted (for reflected radiation). LP02-TR is a very good alternative to silicon cell (photodiode-based) pyranometers, which do not comply to the ISO 9060 standard.


Applicable instrument classification standards are ISO 9060 and WMO-No. 8. Calibration is according to ISO 9847. PV related standards are ASTM E2848 and IEC 61724.


Using LP02-TR is easy. The pyranometer can be connected directly to commonly used data logging systems. The irradiance in W/m2 is calculated by using the transmitter’s output. In LP02-TR’s standard configuration, the 4 to 20 mA output corresponds to a transmitted range of 0 to 1600 W/m2. This range can be adjusted at the factory upon request.

LP02-TR pyranometer design

LP02-TR employs a thermal sensor sensor with black coating, a single glass dome and an anodised aluminium body, which also houses the transmitter.


  • longer cable, in multiples of 5 metres
  • sun screen
  • adapted transmitted range

Suggested use

  • general meteorlogical observations
  • agricultural networks
  • PV system performance monitoring

Use as a sunshine duration sensor

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. This implies that LP02-TR may be used, in combination with appropriate software, to estimate sunshine duration. This solution is much more cost-effective than using a dedicated sunshine duration sensor. Ask for our application note.

See also

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