Hukseflux

Thermal Sensors

SR30

Next level digital secondary standard pyranometer••••

Heated for best data availability: outperforming all externally ventilated pyranometers
Packed with value-added features: includes a tilt sensor and an internal humidity sensor
Low cost of ownership: remote diagnostics and supported by an efficient worldwide calibration andservicing organisation
The right paperwork: instruments are supplied with the ISO 9060 required test certificateswithtiltsensor

Introduction

Figure 1 SR30 digital secondary standard pyranometer

EUUSA

JPN
CHN
IND

BRAFigure 2 SR30 users are supported by the worldwide
Hukseflux calibration and servicing organisation

Welcome to the next level in solar radiation
monitoring! The all-digital SR30 offers thehighest accuracy and highest data availability: itoutperforms all externally ventilated
pyranometers. SR30 is the ideal instrument for
use in PV system performance monitoring andmeteorological networks.
SR30 measures the solar radiation received by aplane surface, in W/m2, from a 180 o field of view
angle. SR30 is an ISO 9060 secondary standard
pyranometer. It is employed where the highest
measurement accuracy is required. SR30 offers
several advantages over competing pyranometers.

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Thermal Sensors

Heated for high data availability

Low cost of ownershipHigh data availability is attained by heating of theouter dome using internal ventilation between
the inner and outer dome. This is as effective
against dew and frost as traditional external
ventilation, without the hassle and large footprint.

SR30 is an affordable secondary standard
instrument and is designed for low cost ofownership, which is mainly determined by costs
of installation, on-site inspections, servicing andcalibration:••

low power consumption: SR30 requires only
2 W, compared to 10 W for externalventilation
low maintenance: SR30 does not requirefilter cleaning••••

low demand on infrastructure: SR30 requires
only 2 W power, compared to 10 W for
external ventilation
reduction of unnecessary on-site inspection
by remote diagnostics
designed for efficient servicing; easy localdiagnostics.
supported by an efficient calibration andmaintenance organisation. Hukseflux offers
local support in the main global economies:
USA, EU, China, India, Japan and Brazil.
Recalibration is recommended every 2 years,
which is good practice in the industry andalso recommended in the standards.

Remote sensor diagnostics
Besides solar radiation, SR30 outputs sensor
diagnostics such as:••••

Figure 3 frost and dew deposition: clear difference between
a non-heated pyranometer (back) versus SR30 (front)

Packed with value-added features
Standard SR30 offers unique features with clear
benefits. SR30 is the only pyranometer to include
a tilt sensor and an internal humidity sensor,
allowing fast performance analysis.

tilt angle
internal ventilator speed (RPM)
internal humidity
heater current

This allows the sensor status to be monitored
without having to send an engineer to the site.

Liabilities covered: test certificates
As required by ISO 9060 for secondary standard
classification, each SR30 is supplied with test
results for the individual instrument:••••sensitivity
directional response
temperature responsetilt angle measurement

Diffuse radiation measurement
With its outstanding zero-offset specifications,
SR30 also is the instrument of choice for highaccuracy diffuse radiation measurement.

Operation in low power mode

Figure 4 SR30 showing its internal ventilation vents

Heater and ventilation may be remotely switchedon and off; operation at < 0.1 W is possible byswitching both the internal ventilator and heater
off. The zero offset will then increase, but overall
performance will still comply with secondary
standard accuracy classification.

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SR30 design
SR30 pyranometer employs a state-of-the-art
thermopile sensor with black coated surface, twodomes and an anodised aluminium body. It offersa digital output via Modbus RTU over 2-wire RS485. The pyranometer dome is heated byventilating the area between the inner and outer
dome. This way of heating is much more efficientthan traditional external ventilation, where mostof the heat is carried away with the ventilation
air. Internal ventilation is as effective againstdew and frost at 2 W as external ventilation at 10W. It also leads to a reduction of zero offsets.

Figure 7 SR30 secondary standard pyranometers withdigital output for GHI (global horizontal irradiance) andPOA (plane of array) measurements
53Figure 5 How it’s done: internal ventilation between
the inner- and outer dome is much more power efficientthan conventional external ventilation

Hukseflux Sensor Manager software
For communication between a PC and SR30, theHukseflux Sensor Manager software is included.
It allows the user to plot and export data, andchange the SR30 Modbus address andcommunication settings. Also, the digital outputs
may be viewed for sensor diagnostics.

1678910421112131415

Figure 6 user interface of the Sensor Manager, showing
sensor diagnostics

Figure 8 overview of SR30: (1) cable, (2) connector,(3) sun screen, (4) bubble level, (5) bubble level
window, (6) outer dome, (7) inner dome, (8) thermalsensor with black coating, (9) internal ventilation vents,(10) quick release system of sun screen, (11)instrument body, (12) levelling feet, (13) optional
spring-loaded levelling mount, (14) optional tubemount, (15) screws included with tube mount

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Levelling mount

SR30 specifications

There are 2 mounting options available for SR30.
They allow for simplified mounting, levelling andinstrument exchange on a flat surface or a tube.

Measurand

Figure 9 optional spring-loaded levelling and tube
mount for SR30

Suggested use••

PV system performance monitoring
scientific meteorological observations

See also•••

SR05, an economical solution often used formonitoring small scale PV systems
consult our pyranometer selection guideview our complete range of solar sensors

hemispherical solar
radiation
ISO classification
secondary standard
pyranometer
Calibration uncertainty< 1.2 % (k = 2)
Measurand
sensor tilt angle
Tilt measurement uncertainty ± 1 o (0 to 90 o)
Heatingincluded
Ventilation
includedStandard operating mode
heated and ventilated
Power consumption< 2.3 W at 12 VDCZero offset a< 2 W/m2
Calibration traceabilityto WRR
Calibration registers
accessible to users
Spectral range
285 to 3000 x 10-9 m
Rated operating temperature -40 to +80 oC
range
Temperature response< ± 0.4 % (-30 to +50 °C)
Temperature response test report includedof individual instrument
Directional response test
report includedof individual instrument
Tilt sensor testof individual instrument
report included
Standard cable length5mRated operating voltage
5 to 30 VDC
range

Optional operation in low power mode
Operating condition
Zero offset aPower consumption

Digital output
OutputAbout Hukseflux
Hukseflux Thermal Sensors offers measurement
solutions for the most challenging applications.
We design and supply sensors as well as test &measuring systems, and offer related services
such as calibration, engineering and consultancy.
Our main area of expertise is measurement ofheat transfer and thermal quantities such as solar
radiation, heat flux and thermal conductivity.
Hukseflux is ISO 9001:2008 certified. Hukseflux
sensors, systems and services are offeredworldwide via our office in Delft, the Netherlands
and local distributors.

heater and ventilator [OFF]5 W/m2 (unventilated)< 0.1 W at 12 VDC

Communication protocol
Transmission mode

- irradiance in W/m2
- instrument body temperature in oC- tilt angle in o
- internal humidity in %- ventilator speed in RPM
Modbus / over 2-wire
RS-485
RTUOptions••••

spring-loaded levelling; a practical mount foreasy mounting, levelling and instrument
exchange on flat surfaces
tube levelling mount with set of bolts
longer cable; 10 and 20 metres
20 metres extension cable with 2 connectors

Are you interested in this product?
E-mail us at: info@hukseflux.com

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Thermal Sensors

SR30 next level digital secondary standard pyranometer
Nowadays, the best pyranometers are made by Hukseflux Thermal Sensors. This overview of features and benefits of SR30 gives you some of the reasons why!
Whatever your application is, Hukseflux offers the highest accuracy in every class at the most attractive price level.

Best data availability• heated domes• suppresses dew and frost deposition• no external ventilator needed• low power consumption

Best paperwork• all ISO required reports with every individual sensor• temperature response testing -30 to 50 oC• full directional response testing• tilt sensor testing

Best measurement accuracy

Best diagnostics• lowest zero offsets• lowest calibration uncertainty• best temperature dependence• tilt angle• humidity• temperature• ventilator speed (RPM)

Best levelling• window for visible bubble level• with optional spring-loaded levelling mount• easy mounting, levelling and instrument exchange

Best worldwide support• efficient calibration support• fast servicing organisation• local stock of spare parts© Copyright by Hukseflux . Version 1701. Page 5/5. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com