Meteorology / surface energy flux measurement
For scientists interested in measurement of surface fluxes Hukseflux offers radiometers (net radiometers, pyranometers and pyrgeometers) as well as heat flux sensors and ultra high accuracy soil temperature profile sensors.
Hukseflux is the market leader in heat flux measurement related to meteorology and Bowen Ratio Systems.
Meteorology and surface energy flux
Hukseflux makes several sensors used in meteorological systems and networks. We are specialised in sensors for measuring:
- solar radiation
- net radiation
- soil heat flux
- soil temperature gradient
- soil thermal conductivity
What we contribute
Hukseflux company started in 1993 making sensors for measurement of heat flux in soils. In the course of the years, we have added many “special purpose” sensors and systems for other parameters of the surface energy balance. Our soil heat flux sensors and 4-component net-radiometers are popular sensors in meteorological networks.
Since 2007 we started making solar radiation sensors and soon after that added longwave radiation sensors.
Our soil temperature profile sensors and soil thermal conductivity sensor are typical research tools, used in high accuracy “research grade” networks.
Sensors made by Hukseflux passed validation and acceptance testing for a large number of national meteorological networks. We supply sensors with the highest accuracy in every class at the most attractive price level.
What is measured
Sensors of our pyranometer product line measure solar or “shortwave” radiation. They essentially measure the radiative energy flux onto or through a surface in [W/m²]. The most common parameters that we measure are:
- solar radiation, most commonly measured in horizontal position - Global Horizontal Irradiance, GHI, measured with a pyranometer
- outdoor solar radiation, reflected solar radiation from the soil - measured with a pyranometer facing the ground, also measuring albedo and net radiation, when combined with GHI.
Sensors of our pyrgeometer product line measure far infra red “longwave” radiation. The most common parameters that we measure are:
- downwelling longwave radiation
- upwelling solar radiation
These 4 measurements combined are used to calculate the net-radiation.
HFP01 heat flux plate and its self-calibrating equivalent HFP01SC are the de-facto standards for soil heat flux measurement. In high-accuracy flux measurement a typical station is equipped with two or more sensors for good spatial averaging.
STP01 soil temperature profile sensor offers highly accurate temperature gradient measurement, including a reliable fixed distance between five measurement points at 2, 5, 10, 20 and 50 x 10⁻² m below the soil surface.
TP01 is a simple, robust sensor to measure soil thermal conductivity. In combination with STP01 and HFP01SC it offers a redundant measurement and allows users to verify the measurement accuracy of soil heat flux. In addition, TP01’s capability to perform a crude measurement of soil thermal diffusivity offers an independent possibility to verify performance of soil moisture content sensors.
Specifications
Pyranometers, pyrgeometers, net radiation sensors and heat flux sensors manufactured by Hukseflux are optimised for the demands of different applications. Unique features are:
- heated pyrgeometers offer much increased data availability of the net radiation measurement
- self-calibrating heat flux sensors, as opposed to conventional sensors, work at a higher level of quality assurance and accuracy.
- we offer various accessories for mounting, such as brackets
- pyranometers are offered in various accuracy classes, with many output options
Selecting a set of sensors
We can assist you in selecting a suitable sensor. A typical checklist is:
- what is the application; what must be measured
- are there any standards that you must follow
- any special environmental conditions like expected dew, frost, snow, dust
- is spatial variability an issue; do I need to employ multiple sensors per station
- what are the accuracy requirements
- how do I organise re-calibration
- what power is available
- how can I mount instruments
- will instruments be regularly cleaned? If not, then purchasing a high accuracy instrument may be less useful.
- what data acquisition do I have, can it measure in the millivolt range; if not what kind of input can it accept?
- what other things must be measured; usually it is best to use one measurement system performing all measurements
Advantages
We can assist you in selecting a suitable sensor. A typical checklist is:
- assistance - select the best sensor for your application
- assistance - optimising the sensor – measuring system combination, also looking at the total system (our users often measure more than just radiation)
- worldwide support – specialists available in the major economies
- calibration support – efficient worldwide calibration organisation
- proven performance – we have experience in most applications
- traceability - formal metrological traceability to international standards
Take a look at our selection of suitable sensors:
Application notes
Pyranometer selection guide: how to choose the best sensor for your application
Products
SR30-M2-D1
Digital Class A pyranometer with heating and tilt sensor
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class A pyranometer |
| IEC 61724-1:2021 compliance | meets Class A PV monitoring system requirements |
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IR20 & IR20WS
Research grade pyrgeometers
| Measurand | longwave radiation |
| Optional measurand | sky temperature, surface temperature |
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SRA30-M2-D1
Digital Class A (secondary standard) albedometer with heating and tilt sensor
| Measurand | global solar radiation and reflected solar radiation |
| Optional measurand | albedo or solar reflectance, net solar radiation |
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SRA15 series
Spectrally flat Class B albedometers
| Measurand | global solar radiation and reflected solar radiation |
| Optional measurand | albedo or solar reflectance, net solar radiation |
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SR15-D1
Digital first class pyranometer with Modbus over RS-485 output and heater
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class B pyranometer |
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IR02
Pyrgeometer with heater
| Measurand | longwave radiation |
| Optional measurand | sky temperature, surface temperature |
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SR15-D2A2
Digital first class pyranometer with Modbus over TTL and 4-20 mA output
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class B pyranometer |
| IEC 61724-1:2021 compliance | Class B |
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IR02-TR
Pyrgeometer with heater and 4-20 mA transmitter
| Measurand | longwave radiation |
| Optional measurand | sky temperature, surface temperature |
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SR15-A1
Analogue first class pyranometer with heater
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class B pyranometer |
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SRA20-D2
Digital secondary standard albedometer
| Measurand | global solar radiation and reflected solar radiation |
| Optional measurand | albedo or solar reflectance, net solar radiation |
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SR05-D1A3
Digital second class pyranometer with Modbus RS-485 and 0-1 V output
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class C pyranometer |
| IEC 61724-1:2021 compliance | Class B |
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TP01
Thermal properties sensor
| Measurement range | 0.3 to 5 W/(m·K) |
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DR20-A1
Analogue spectrally flat Class A pyrheliometer, with heating
| Measurand | direct solar radiation |
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DR15-A1
Analogue spectrally flat Class B pyrheliometer, with heating
| Measurand | direct solar radiation |
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NR01
4-component net radiometer
| Measurand | downward longwave radiation*, global solar radiation, net radiation, reflected solar radiation, upward longwave radiation* |
| Optional measurand | albedo or solar reflectance, sky temperature*, solar duration, surface temperature* |
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SR05-D2A2
Digital second class pyranometer with Modbus over TTL and 4-20 mA output
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class C pyranometer |
| IEC 61724-1:2021 compliance | Class B |
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FHF06
High temperature foil heat flux sensor for use up to 250 °C; patented technology, flexible, with temperature sensor and thermal spreaders
| Measurand | heat flux, temperature |
| Measurement range | (-20 to +20) x 10³ W/m² |
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SR05-A1
Analogue second class pyranometer
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class C pyranometer |
| IEC 61724-1:2021 compliance | Class B |
STP01
Soil temperature profile sensor with self-test
| Measurand | temperature at 5 depths from 0 to 0.5 m |
| Measurement range | -30 to +70 °C |
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SR05-LI19
Pyranometer with handheld read-out unit / datalogger
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class C pyranometer |
| IEC 61724-1:2021 compliance | Class B |
HFP01
Heat flux plate
| Measurand | heat flux |
| Measurement range | -2000 to +2000 W/m² |
| Sensitivity (nominal) | 60 x 10⁻⁶ V/(W/m²) |
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FHF05 series
Foil heat flux sensors with thermal spreaders, flexible, different dimensions, with temperature sensor
| Measurand | heat flux, temperature |
| Measurand range | (-10 to +10) x 10³ W/m² |
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HFP01SC
Self-calibrating heat flux sensor
| Measurand | heat flux |
| Measurement range | -2000 to +2000 W/m² |
| Sensitivity (nominal) | 60 x 10⁻⁶ V/(W/m²) |
HFP03
Ultra sensitive heat flux plate
| Measurand | heat flux |
| Measurand range | -2000 to +2000 W/m² |
| Sensitivity (nominal) | 500 x 10⁻⁶ V/(W/m²) |
RA01
2-component radiometer
| Measurand | downward longwave radiation*, global solar radiation |
| Optional measurand | sky temperature*, solar duration |
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SRA01
Second class albedometer
| Measurand | global solar radiation and reflected solar radiation |
| Optional measurand | albedo or solar reflectance, net solar radiation |
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FHF05SC series
FHF05SC series heat flux sensors
| Measurand | heat flux, temperature |
| Measurand range | (-10 to +10) x 10³ W/m² |
SR25
Spectrally flat Class A pyranometer with sapphire outer dome
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class A pyranometer |
| IEC 61724-1:2021 compliance | meets Class A PV monitoring system requirements |
SR22
Secondary standard pyranometer with quartz domes – extended spectral range
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class A pyranometer |
| IEC 61724-1:2021 compliance | Class A (when used with VU01) |
SR20-D2
Digital Class A pyranometer with Modbus RTU and 4-20 mA output
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class A pyranometer |
| IEC 61724-1:2021 compliance | Class A (when used with VU01) |
SR20
Analogue Class A pyranometer
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class A pyranometer |
| IEC 61724-1:2021 compliance | meets Class A PV monitoring system requirements |
SHR02
Shadow ring for pyranometers, combined with a pyranometer forming a diffusometer
PMF01
Pyranometer mounting fixture, for all Hukseflux pyranometer models, for 1 x pyranometer, horizontal or tilted
PMF02
Dual pyranometer mounting fixture, for all Hukseflux pyranometer models, for 1 x horizontal and 1 x tilted pyranometer
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VMA01
Ventilation mounting adapter for PMF01, for 1 x VU01 ventilated pyranometer, horizontal or tilted
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Sensor Manager
Software for digital Hukseflux solar radiation sensors with a Modbus interface
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Pyranometer App
Turn your iPhone into a ‘pyranometer’ with our solar radiation / Pyranometer App
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