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Apogee Instruments SP-522, Owner'S Manual

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Apogee Instruments SP-522 Owner'S Manual Download Page 5

SENSOR MODELS 

This manual covers the Modbus RTU protocol model SP-522 pyranometer sensor (in bold below). Additional 
models are covered in their respective manuals. 

 

 

 

 

Model 

Signal 

SP-522 

Modbus 

SP-510 

Self-powered

 

SP-610 

Self-powered 

A sensor

’s

 model number and serial number are 

located on the bottom of the sensor. 

 

Summary of Contents for SP-522

Page 1: ...NSTRUMENTS INC 721 WEST 1800 NORTH LOGAN UTAH 84321 USA TEL 435 792 4700 FAX 435 787 8268 WEB APOGEEINSTRUMENTS COM Copyright 2022 Apogee Instruments Inc OWNER S MANUAL PYRANOMETER Models SP 522 Rev 10 Feb 2022 ...

Page 2: ...TABLE OF CONTENTS ...

Page 3: ...ical and electronic products with respect to the restriction of hazardous substances Please be advised that based on the information available to us from our raw material suppliers the products manufactured by us do not contain as intentional additives any of the restricted materials including lead see note below mercury cadmium hexavalent chromium polybrominated biphenyls PBB polybrominated diphe...

Page 4: ...s traceable to Class A blackbody thermopile pyranometers traceable to the world radiation reference in Davos Switzerland Specifications compare favorably to specifications for World Meteorological Organization WMO moderate and good quality classifications and specifications for International Organization of Standardization ISO Class C and Class B classifications Typical applications of pyranometer...

Page 5: ...ol model SP 522 pyranometer sensor in bold below Additional models are covered in their respective manuals Model Signal SP 522 Modbus SP 510 Self powered SP 610 Self powered A sensor s model number and serial number are located on the bottom of the sensor ...

Page 6: ...erland SP 522 ISO 9060 2018 Class C previously known as second class Input Voltage Requirement 5 5 to 24 V Average Max Current Draw 4 mA heater off 30 mA heater on Calibration Uncertainty at 1000 W m 2 Less than 3 see Calibration Traceability below Measurement Repeatability Less than 1 Long term Drift Non stability Less than 2 per year Non linearity Less than 1 up to 2000 W m 2 Field of View 180 S...

Page 7: ...ood To facilitate mounting on a mast or pipe the Apogee Instruments model AL 120 Solar Mounting Bracket with Leveling Plate is recommended To minimize azimuth error the sensor should be mounted with the cable pointing toward true north in the northern hemisphere or true south in the southern hemisphere Azimuth error is typically less than 1 but it is easy to minimize by proper cable orientation In...

Page 8: ...ee directly to ensure ordering the proper pigtail configuration Alignment When reconnecting a sensor arrows on the connector jacket and an aligning notch ensure proper orientation Disconnection for extended periods When disconnecting the sensor for an extended period of time from a station protect the remaining half of the connector still on the station from water and dirt with electrical tape or ...

Page 9: ...he factory Modbus Interface The following is a brief explanation of the Modbus protocol instructions used in Apogee SP 522 pyranometers For questions on the implementation of this protocol please refer to the official serial line implementation of the Modbus protocol http www modbus org docs Modbus_over_serial_line_V1_02 pdf 2006 and the general Modbus protocol specification http www modbus org do...

Page 10: ... using a CR1000X logger adding 1 to the zero based address will produce the one based address for the register Register Format According to the Modbus protocol specification Holding Registers the type registers Apogee sensors contain are defined to be 16 bits wide However when making scientific measurements it is desirable to obtain a more precise value than 16 bits allows Thus several Modbus impl...

Page 11: ...status 1 means device is busy 0 otherwise 8 9 firmware version Integer Registers 40 calibrated output watts shifted one decimal point to the right 41 detector millivolts shifted two decimal points to the right 42 Reserved for Future Use 43 device status 1 means device is busy 0 otherwise 44 firmware version shifted one decimal point to the right ...

Page 12: ...5 heater status Integer Registers 48 slave address 49 model number 50 serial number 51 baud rate 0 115200 1 57600 2 38400 3 19200 4 9600 any other number 19200 52 parity 0 none 1 odd 2 even 53 number of stopbits 54 multiplier rounded to the nearest whole number 55 offset rounded to the nearest whole number 56 running average 57 heater status Registers marked with an asterisk cannot be written to u...

Page 13: ...function code 0x3 reading register address 0 Each pair of square brackets indicates one byte Slave Address Function Starting Address High Byte Starting Address Low Byte No of Registers High Byte No of Registers Low Byte CRC High Byte CRC Low Byte 0x01 0x03 0x00 0x00 0x00 0x02 0xC4 0x0B An example of a data packet sent from the controller to the sensor using function code 0x10 writing a 1 to regist...

Page 14: ...ticular tolerances To determine if your sensor needs recalibration the Clear Sky Calculator www clearskycalculator com website and or smartphone app can be used to indicate the total shortwave radiation incident on a horizontal surface at any time of day at any location in the world It is most accurate when used near solar noon in spring and summer months where accuracy over multiple clear and unp...

Page 15: ... pyranometers total shortwave radiation and one for quantum sensors photosynthetic photon flux density Clear Sky Calculator for pyranometers Site data are input in blue cells in middle of page and an estimate of total shortwave radiation is returned on right hand side of page ...

Page 16: ...e cable length from the sensor to the controller should be kept short no longer than 20 meters For more information see section 3 3 5 in this document http www modbus org docs Modbus_over_serial_line_V1_02 pdf RS 485 Cable Length If using an RS 485 serial interface longer cable lengths may be used The trunk cable can be up to 1000 meters long The length of cable from the sensor to a tap on the tru...

Page 17: ... reinstallation and shipping of suspected warranty items to our factory The warranty does not cover equipment that has been damaged due to the following conditions 1 Improper installation use or abuse 2 Operation of the instrument outside of its specified operating range 3 Natural occurrences such as lightning fire etc 4 Unauthorized modification 5 Improper or unauthorized repair Please note that ...

Page 18: ... specifications due to a failure of product materials or craftsmanship Apogee Instruments will repair or replace the items free of charge If it is determined that your product is not covered under warranty you will be informed and given an estimated repair replacement cost PRODUCTS BEYOND THE WARRANTY PERIOD For issues with sensors beyond the warranty period please contact Apogee at techsupport ap...

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