Hukseflux LP02 User manual

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USER MANUAL LP02
Second class pyranometer
Hukseflux
Thermal Sensors

LP02 manual v1606 2/47
Warning statements
Putting more than 12 Volt across the sensor wiring
can lead to permanent damage to the sensor.
Do not use “open circuit detection” when measuring
the sensor output.

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Contents
Warning statements 2
Contents 3
List of symbols 4
Introduction 5
1Ordering and checking at delivery 7
1.1 Ordering LP02 7
1.2 Included items 7
1.3 Quick instrument check 8
2Instrument principle and theory 9
3Specifications of LP02 12
3.1 Specifications of LP02 12
3.2 Dimensions of LP02 15
4Standards and recommended practices for use 16
4.1 Classification standard 16
4.2 General use for solar radiation measurement 16
4.3 General use for sunshine duration measurement 16
4.4 Specific use in meteorology and climatology 17
5Installation of LP02 18
5.1 Site selection and installation 18
5.2 Installation of the optional sun screen 19
5.3 Electrical connection 19
5.4 Requirements for data acquisition / amplification 20
6Making a dependable measurement 21
6.1 The concept of dependability 21
6.2 Reliability of the measurement 22
6.3 Speed of repair and maintenance 23
6.4 Uncertainty evaluation 24
7Maintenance and trouble shooting 26
7.1 Recommended maintenance and quality assurance 26
7.2 Trouble shooting 27
7.3 Calibration and checks in the field 28
7.4 Data quality assurance 29
8LP02-TR 30
8.1 Introduction LP02-TR 30
8.2 Dimensions of LP02-TR 32
8.3 Electrical connection of LP02-TR 34
9Appendices 37
9.1 Appendix on cable extension / replacement 37
9.2 Appendix on tools for LP02 38
9.3Appendix on spare parts for LP02 38
9.4 Appendix on standards for classification and calibration 39
9.5 Appendix on calibration hierarchy 40
9.6 Appendix on meteorological radiation quantities 41
9.7 Appendix on ISO and WMO classification tables 42
9.8 Appendix on definition of pyranometer specifications 43
9.9 Appendix on terminology / glossary 44
9.10 EU declaration of conformity 45

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List of symbols
Quantities Symbol Unit
Voltage output U V
Sensitivity S V/(W/m2)
Temperature T °C
Electrical resistance ReΩ
Solar irradiance E W/m2
Solar radiant exposure H W∙h/m2
Time in hours h h
(see also appendix 9.6 on meteorological quantities)
Subscripts
Not applicable

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Introduction
LP02 is a solar radiation sensor that is applied in most common solar radiation
observations. It complies with the second class specifications of the ISO 9060 standard
and the WMO Guide. LP02 pyranometer is widely used in (agro-)meteorological
applications and for PV system performance monitoring.
LP02 measures the solar radiation received by a plane surface from a 180 ofield of view
angle. This quantity, expressed in W/m2, is called “hemispherical” solar radiation. LP02
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
pyranometer is a very good alternative to silicon cell (photodiode-based) pyranometers,
which do not comply to the ISO 9060 standard. In combination with the right software,
also sunshine duration may be measured.
Using LP02 is easy. The pyranometer can be connected directly to commonly used data
logging systems. The irradiance in W/m2is calculated by dividing the LP02 output, a
small voltage, by the sensitivity. This sensitivity is provided with LP02 on its calibration
certificate.
The central equation governing LP02 is: E = U/S (Formula 0.1)
The instrument should be used in accordance with the recommended practices of ISO,
WMO and ASTM.
Suggested use for LP02:
•general meteorlogical observations
•agricultural networks
•PV system performance monitoring
Figure 0.1 LP02 second class pyranometer