Kipp & Zonen SGR series, Instruction Manual

Page 1: ...SGR series Smart Pyrgeometer Instruction Manual...

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Page 3: ...alled and used according to the instructions supplied by Kipp Zonen Kipp Zonen shall in no event be liable for incidental or consequential damages including without limitation lost profits loss of inc...

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Page 5: ...echpark 36 2628 XH Delft P O Box 507 2600 AM Delft The Netherlands declares under our sole responsibility that the product SGR3 and SGR4 Smart Pyrgeometer to which this declaration relates is in confo...

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Page 7: ...Installation for shaded measurement of downward long wave radiation 2 2 5 Installation for measurement of net long wave radiation 2 3 Electrical connections 2 3 1 Power connection 2 3 2 Data connecti...

Page 8: ...alibration principle 7 4 2 Traceability to World Radiometric Reference 7 4 3 Recalibration 8 SGR models 8 1 SGR4 8 2 Specifications 9 Frequently asked questions 10 Trouble shooting 11 Keyword index Ap...

Page 9: ...GR series Both the SGR3 and SGR4 pyrgeometers are described even though they have a di erent construction the general definitions and principles apply to both models The physical construction and dete...

Page 10: ...e SGR4 10 silicon window housing detector sun shield bubble level connector fixed foot adjustable feet desiccant desiccant glass window housing detector sun shield bubble level connector fixed foot ad...

Page 11: ...Optional cable pre wired with 8 pins connector or connector only for customer cable 4 Test reports 5 Instruction sheet 6 Radiometer fixing kit The calibration certificate supplied with the instrument...

Page 12: ...ature fluctuations of the pyrgeometer body can produce o set signals therefore it is recommended to isolate the pyrgeometer thermally from the mounting stand by placing it on its levelling screws Ensu...

Page 13: ...he levelling screws on a horizontal surface for easy orientation of the instrument parallel to the inclined surface Because the temperature of the mounting stand is expected to rise considerably more...

Page 14: ...s negligible due to the unique construction of the pyrgeometer 2 2 5 Installation for measurement of net long wave radiation A net pyrgeometer measures both the downward atmospheric long wave radiatio...

Page 15: ...by using a lightning conductor and do not connect the cable shield at the readout end If there is no good ground connection at the pyrgeometer the shield at the cable end should be connected to ground...

Page 16: ...onnection Connection to a Personal Computer by Universal Serial Bus USB The connection depends on the use of a RS 485 to USB converter The converter must have galvanic isolation between the inputs and...

Page 17: ...utput versions have been factory set such that an output of 0 Volts represents 0 W m this will never be reached in practice and the full scale output of 1 Volt represents 1000 W m The voltage output r...

Page 18: ...ontrol cable 2 4 Operation After completing the installation the pyrgeometer will be ready for operation The downward atmospheric long wave radiation is calculated automatically inside the pyrgeometer...

Page 19: ...eometer and the colder sky In this case the calculated atmospheric long wave radiation Ld shows a relatively large positive value In the case of rain the detector output will read zero because water d...

Page 20: ...cause of the filter cut on at 4 5 m Other types of pyrgeometers can exhibit 0 to 10 W m Direct solar irradiance in Davos Switzerland at solar noon in mid September 2 5 Measurement uncertainty When a p...

Page 21: ...ng but should be wiped of as soon as possible manually The window of the pyrgeometer can be ventilated continuously by a heated blower to keep the window above the dew point temperature The need for h...

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Page 23: ...r improve measurement accuracy of the SGR4 pyrgeometers the CVF4 ventilation unit can be used CVF4 has a tacho output to monitor the fan speed and 5 or 10 Watt heater The advantages of a CVF4 are Lowe...

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Page 25: ...o connect to a PC Collecting data makes it possible to store data from the smart sensor in a comma separated file The comma separated file is created at the beginning of every new day or at the beginn...

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Page 27: ...ve their cut on at a lower wavelength Problems may occur in the case of clear sunny days with low humidity In the solar spectrum between 2 5 and 4 5 m there can still be an amount of infrared solar ra...

Page 28: ...or is fitted as standard to the SGR pyrgeometers 5 4 Housing The radiometer housing accommodates all fundamental pygeometer parts The anodized Aluminium parts are light weight and give a high mechanic...

Page 29: ...g wave thermal or infrared radiation Downward long wave radiation is a result of atmospheric re emission Re emission is the reversible e ect of absorption of long wave radiation emitted by the Earth a...

Page 30: ...exactly horizontal over the range from 0 to 90 tilt The tilt response is proportional to the incident radiation The error could be corrected for in applications where it is necessary to install the p...

Page 31: ...h angle of incidence This is sometimes called the cosine law or cosine response and is very important in the measurement of short wave solar radiation However the directional response of pyrgeometers...

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Page 33: ...f necessary and then reconnect Check cables for damage caused by accident or by rodents Check the instrument mountings and any base supports are secure 7 4 Calibration An ideal radiometer gives an out...

Page 34: ...ponse are recorded Kipp Zonen keeps two reference radiometers for each radiometer model These reference radiometers are sent alternate years to WRC for calibration so production and calibration in Del...

Page 35: ...been designed for scientific measurements outdoors of downward atmospheric long wave radiation with extremely high reliability and accuracy SGR4 provides an output voltage that is proportional to the...

Page 36: ...perating temperature range Storage temperature range Humidity range Ingress Protection IP rating 1 Longwave down radiation Specifications 0 to 1V 0 to 1000W m 4 to 20mA 0 to 1000W m RS 485 Modbus 0 to...

Page 37: ...t least 1000 times more than the impedance of the pyrgeometer plus cable Therefore the current that goes through the readout cable is negligible and won t generate an o set For the SGR A current versi...

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Page 39: ...irt dust or water Check the last calibration date to see if re calibration or desiccant replacement is required Re calibration is advised every 2 years The desiccant in the SGR lasts for 10 years and...

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Page 41: ...a horizontal surface GHI Global Di use Direct x cos is the solar zenith angle Irradiance Radiant flux density W m Long wave radiation Radiation with wavelengths from 4 m to more than 40 m Pyranometer...

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Page 43: ...R U All Version of the object data model 102 this version 2 IO_OPERATIONAL_MODE DevMode R U All Operational mode normal service calibration and so on 3 IO_STATUS_FLAGS Status R U All Device Status fla...

Page 44: ...U16 All MODBUS SMA device address RS 485 2 Writing any value to input registers 26 33 will reset the contents of the registers Legend PDU address PDU address 1 Modbus register number Parameter Name Na...

Page 45: ...FL_ SENSOR2_DATA FSensor2 R F All Temperature compensated Long wave down radiation with decimal point 10102 FL_STDEV_SENSOR2 FStdDev2 R F All Not used always 0 10014 FL_BODY_TEMPERATURE R F All Body...

Page 46: ...SMP3 current loop version 602 1 5 20 V W m Pyranometer SMP6 volt version 619 1 7 14 V W m Pyranometer SMP6 current version 620 1 7 14 V W m Pyranometer SMP10 volt version 617 1 7 14 V W m Pyranometer...

Page 47: ...G Bit 1 Overflow see IO_OVERFLOW_ERROR Bit 2 Underflow see IO_UNDERFLOW_ERROR Bit 3 Error flag see IO_ERROR_FLAG Bit 4 ADC Error see IO_ADC_ERROR Bit 5 DAC Error see IO_DAC_ERROR Bit 6 Calibration Err...

Page 48: ...igh for example 1 poll per second then the standard deviation will be zero or almost zero but if the poll frequency is very low then the standard deviation can be quite high indicating that the data i...

Page 49: ...R R All Overflow signal out of range 4 IO_UNDEFLOW_ERROR R All Underflow signal out of range 5 IO_ERROR_FLAG R All General hardware error set if one of the H W error flags is set 6 IO_ADC_ERROR R All...

Page 50: ...in the factory mode or service mode and is stored in non volatile memory The default scale factor stored in non volatile memory is always set after a power on However it is possible to change the def...

Page 51: ...d when there is a fatal or correctable hardware error or software error such as ADC error DAC error calibration error or when the update of the calibration data failed When the IO_ERROR_FLAG is raised...

Page 52: ...LEAR_ERROR can be used to select the normal mode see IO_OPERATIONAL_MODE The smart sensors will always start up in the normal mode Note Use IO_CLEAR_ERROR to return to the normal mode Coil 20 IO_ROUND...

Page 53: ...sor uses variable filter constants to minimize the e ect on the step response The default value after power on is OFF A 11 Requesting serial number Register 41 IO_BATCH_NUMBER The batch number defines...

Page 54: ...rData 0 float fSensorData 0 int main void while true Send MODBUS request 0x04 Read input registers to slave 2 Get modus data will wait for the answer and copies the data to registers uOperationalMode...

Page 55: ...adiation Centres World Radiation Centre The World Radiation Centre capable of pyrgeometer calibration is located at Physikalisch Meterologisches Observatorium Dorfstrasse 33 CH 7260 Davos Dorf Switzer...

Page 56: ...s calibration of their instruments every two years This can be done at the Kipp Zonen factory Here recalibration to the highest standards can be performed at low cost Recalibration can usually be perf...

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Page 58: ...ci n y suministro de repuestos Passion for Precision Go to www kippzonen com for your local distributor or contact your local sales office HEAD OFFICE Kipp Zonen B V Delftechpark 36 2628 XH Delft P O...