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Summary of Contents for Apogee Instruments SP-522
- Page 1 OWNER’S MANUAL PYRANOMETER Models SP-522 Rev: 10-Feb-2022 APOGEE INSTRUMENTS, 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.
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Page 3: Certificate Of Compliance
RoHS 3 compliant using exemption 6c. Further note that Apogee Instruments does not specifically run any analysis on our raw materials or end products for the presence of these substances, but we rely on the information provided to us by our material suppliers. - Page 4 Sensors are potted solid with no internal air space and are designed for continuous measurement of shortwave radiation in outdoor environments. The SP-522 model outputs a digital signal using Modbus RTU communication protocol over RS-232 or RS-485.
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Page 5: Sensor Models
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... -
Page 6: Specifications
(316), M8 connector Calibration Traceability Apogee Instruments SP-500 series pyranometers are calibrated through side-by-side comparison to the mean of four transfer standard pyranometers (shortwave radiation reference) under high intensity discharge metal halide lamps. The transfer standard pyranometers are calibrated through side-by-side comparison to the mean of at least two ISO-classified reference pyranometers under sunlight (clear sky conditions) in Logan, Utah. -
Page 7: Deployment And Installation
Mount the sensor to a solid surface with the nylon mounting screw provided. To accurately measure PPFD incident on a horizontal surface, the sensor must be level. An Apogee Instruments model AL-100 Leveling Plate is recommended to level the sensor when used on a flat surface or being mounted to surfaces such as wood. To facilitate mounting on a mast or pipe, the Apogee Instruments model AL-120 Solar Mounting Bracket with Leveling Plate is recommended. -
Page 8: Cable Connectors
CABLE CONNECTORS Apogee sensors offer cable connectors to simplify the process of removing sensors from weather stations for calibration (the entire cable does not have to be removed from the station and shipped with the sensor). The ruggedized M8 connectors are rated IP68, made of corrosion-resistant marine-grade stainless-steel, and designed for extended use Cable connectors are attached directly to the head. -
Page 9: Operation And Measurement
Coefficients are programmed into the sensors at the 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... - Page 10 Sensor addresses Each sensor is given an address from 1 to 247. Apogee sensors are shipped with a default address of 1. If using multiple sensors on the same Modbus line, the sensor’s address will have to be changed by writing the Slave Address register.
- Page 11 Read only registers (function code 0x3). Float Registers calibrated output watts detector millivolts Reserved for Future Use device status (1 means device is busy, 0 otherwise) firmware version Integer Registers calibrated output watts (shifted one decimal point to the right) detector millivolts (shifted two decimal points to the right) Reserved for Future Use device status (1 means device is busy, 0 otherwise)
- Page 12 (rounded to the nearest whole number)* offset (rounded to the nearest whole number)* running average heater status *Registers marked with an asterisk (*) cannot be written to unless a specific procedure is followed. Contact Apogee Instruments to receive the procedure for writing these registers.
- Page 13 Packet Framing: Apogee sensors use Modbus RTU packets and tend to adhere to the following pattern: Slave Address (1 byte), Function Code (1 byte), Starting Address (2 bytes), Number of Registers (2 bytes), Data Length (1 byte, optional) Data (n bytes, optional) Modbus RTU packets use the zero-based address when addressing registers.
- Page 14 3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water. Apogee Instruments pyranometers have a domed diffuser and housing for improved self-cleaning from rainfall, but active cleaning may be necessary. Dust or organic deposits are best removed using water, or window cleaner, and a soft cloth or cotton swab.
- Page 15 Homepage of the Clear Sky Calculator. Two calculators are available: One for 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.
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Page 16: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality If the sensor does not communicate with the datalogger, use an ammeter to check the current drain. It should be near 37 mA when the sensor is powered. Any current drain significantly greater than approximately 37 mA indicates a problem with power supply to the sensors, wiring of the sensor, or sensor electronics. -
Page 17: Return And Warranty Policy
RETURN AND WARRANTY POLICY RETURN POLICY Apogee Instruments will accept returns within 30 days of purchase as long as the product is in new condition (to be determined by Apogee). Returns are subject to a 10 % restocking fee. WARRANTY POLICY... - Page 18 84321, USA 5. Upon receipt, Apogee Instruments will determine the cause of failure. If the product is found to be defective in terms of operation to the published specifications due to a failure of product materials or craftsmanship, Apogee Instruments will repair or replace the items free of charge.
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