DIgITAL SILICon IrrADIAnCe SenSor
Si-rS485-TC-T
Measurement of Solar Irradiance
Since1994wehavebeendevelopingandproducingdifferenttypesof
siliconirradiancesensors.Untiltheyear2010morethan15000sensors
weresoldworldwide.Oursiliconsensorisanaffordablesolutionformeasurementofsolarirradiance.Thepowder-coatedaluminiumcaseinconjunctionwiththesolarcelllaminatedbetweenglassandTedlarfoilbuilds
averyreliableandruggedsensor.
general Description
Mode of operation
Asiliconsolarcellcanbeusedasan
irradiancesensor,becausetheshort-circuit
current is proportional to irradiance. Our
sensorsarebuildoutofamonocrystalline
solarcellconnectedtoashunt.Duetothe
lowresistanceoftheshuntthecelloperates
nexttoshortcircuit.
The temperature coefficient of the
short-circuit current creates a small error.
Thereforeallofoursiliconsensorswiththe
extension„TC“haveanactivetemperature
compensation,whichreducesthiserrorby
factor20.Thecompensationisrealizedby
usingaspecifictemperaturesensorlaminatedtotherearsideofthesolarcell.
Themeasuringsignalsofshort-circuit
current of the cell and the resistance
valueofthetemperaturesensoraremeasuredbyamicrocontroller.Thecalcula-
IngenIeurbüro
Mencke & Tegtmeyer gmbH
MeßgerätefürdieSolartechnik
IngenIeurbüro
Mencke&TegtmeyerGmbH
tedvaluesofirradianceandtemperature
aregivenontoaRS485portwithcusomerspecificationprotocoll.Theelectronic circuit is optimised for low power
consumption.
Allsensorsarecalibratedinsimulated
sunlightagainstareferencecellofthesame
type.Thereferencecellisperiodicallycalibratedagainstareferencecellcalibratedby
FraunhoferISE,Freiburg.
SchwarzerWeg43A
D - 31789Hameln
Germany
Tel: +49 (0) 5151 / 40 36 99 - 0
Fax: +49 (0) 51 51 / 40 36 99 - 19
email:info@ib-mut.de
http://www.ib-mut.de
Mechanical Construction
ThesolarcellisembeddedinEthylenVinyl-Acetat (EVA) between glass and
Tedlar.Thelaminatedcellisintegratedinto
a case of powder-coated aluminium.
Therefore the sensor construction is comparable to that of a standard PV module.
The electrical connection is realized by a
3 mcableorawaterproof(IP67)connector.
CustomsNo.DE6018572
Bankingaccount:
StadtsparkasseHameln
(BLZ254 500 01)
Account52233
VATNo.DE258133277
FinanzamtHameln
22/200/62745
AmtsgerichtHannover
HRB202636
Management:
Dipl.-Ing.DetlefMencke
Dipl.-Ing.DirkTegtmeyer
DIgITAL SILICon IrrADIAnCe SenSor
Si-rS485-TC-T
Technical Data
SI-SenSor
general information
ACCurACy
Irradiance
Temperature
eLeCTrICAL
ConneCTIon
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Solarcell:
Currentshunt:
Operatingtemperature:
Electricalconnection:
Powersupply:
Interface:
Protocol:
Galvanicisolation:
Case,protectionmode:
Dimensions,weight:
CustomsNumber:
MonocrystallineSilicon(50mmx33mm)
0.1W (TK=30ppm/K)
– 20°Cto70°C
via3mcable,UVandwheatherproof
12to28VDC (40mAtypicallyat20VDC)
RS485upto19200Baud
M&T,MODBUS,customerspecific
1000VbetweenpowersupplyandRS485bus
Powder-coatedaluminum,IP65
155mmx85mmx40mm,approx.360g
85414090
• Errorwithtemperaturecompensationcomparedtopyranometerwithinthe
operatingrangeof-20°Cto70°Candverticallybeamofirradiance:
±5%
• Erroratminimumandmaximumtemperature:
Colour mapping of cable
Red(wire):
Black(wire):
Brown(wire):
Orange(wire):
Black(largeprofile):
±1.0°C
Power(plus)
Power(minus)
Data+
Datashielding
MeCHAnICAL
InSTALLATIon
TheSisensorhastwotoungeswitheachtwoM6andoneM8drills.TheinstallationatasuitabelconstructionmustuseatleastoneM6screwwithwashersateach
toung.
Duringinstallationthepressurecompensationelementneartheelectricalconnectionmustnotbedamaged.Ifthecapoftheelementhasloosened,itcanbesnapped
onagain.
HAnDLIng of
CASe
TheSisensorcanbecleanedusingasmoothcottoncloth,waterandamildcleaningfluid.
An opening of the sensor case by the user or installation staff is not necessary. If
the case is opened, we can not guarantee the seal of the case anymore.
opTIonS
• Si-RS485-TC-2T:SameasSi-RS485-TC-T,butadditionallywithfixedambienttemperaturesensorwith3mcable,measuringrange:
-25…+75°C
• Si-RS485-TC-2T-v: Same as Si-RS485-TC-T, but with optional connections for
externalambientormoduletemperaturesensorandwindspeedsensor
ACCeSSorIeS
for
SI-rS485-TC-2T-v
• Ambienttemperaturesensorinstainlesssteelbushwith3mcable
Measuringrange:
-25…+75°C
• Moduletemperaturesensorinaluminumblockwith2mcable
Measuringrange:
-25…+75°C
• Windspeedsensorwith5mcable
Measuringrange:
0,8…40m/s
Ingenieurbüro Mencke & Tegtmeyer GmbH · Hameln · © September 2011
Theconceptforover-voltageprotectionhastomatchthelocalspecifications.