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Summary of Contents for Apogee Instruments SP-212
- Page 1 OWNER’S MANUAL PYRANOMETER Models SP-212 and SP-215 Rev: 7-Sept-2021 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2021 Apogee Instruments, Inc.
- Page 2 TABLE OF CONTENTS Owner’s Manual ....................................1 Certificate of Compliance ................................. 3 Introduction ..................................... 4 Sensor Models ..................................5 Specifications ................................... 6 Deployment and Installation ..............................10 Operation and Measurement ..............................12 Maintenance and Recalibration ............................. 16 Troubleshooting and Customer Support ..........................18 Return and Warranty Policy ..............................
- Page 3 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 Apogee Instruments SP series pyranometers consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device.
- Page 5 This manual covers model SP-212 and SP-215 pyranometer sensors that provide a voltage output. Additional models are covered in their respective manuals. Model Signal SP-212 0-2.5 V SP-215 0-5 V SP-110 Self-powered SP-214 4-20 mA SP-230 Self-powered SP-420 SP-421 SDI-12...
- Page 6 0.04 ± 0.04 % per C (see Temperature Response below) Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m Dimensions Serial # 12199 (SP-212), 30.5 mm diameter, 37 mm height 12209 (SP-215) and above Dimensions...
- Page 7 Calibration Traceability Apogee Instruments SP series pyranometers are calibrated through side-by-side comparison to the mean of four Apogee model SP-110 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 8 Spectral Response Spectral response estimate of Apogee silicon-cell pyranometers. Spectral response was estimated by multiplying the spectral response of the photodiode, diffuser, and adhesive. Spectral response measurements of diffuser and adhesive were made with a spectrometer, and spectral response data for the photodiode were obtained from the manufacturer.
- Page 9 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee silicon-cell pyranometers is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively. Mean cosine response of eleven Apogee silicon-cell pyranometers (error bars represent two standard deviations...
- Page 10 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 11 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 in harsh environmental conditions.
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Page 12: Very Important
In this case, please disregard the extra wires and follow the color-coded wiring guide provided. Wiring for SP-212 and SP-215 with Serial Numbers 9898 above or with a cable connector White: Positive (signal from sensor) Red: Input Power SP-212 5-24 V DC, SP-215 5.5-24 V DC... - Page 13 Sensor Output 2000 mV Serial Numbers 10517 and above. Example of total shortwave radiation measurement with an Apogee SP-212 pyranometer. Full sunlight yields total shortwave radiation on a horizontal plane at the Earth’s surface of approximately 1000 W m .
- Page 14 Spectral Errors for Measurements with Silicon-cell Pyranometers Apogee SP series pyranometers are calibrated under electric lamps in a calibration laboratory. The calibration procedure simulates calibration under clear sky conditions at a solar zenith angle of approximately 45°. However, due to the limited spectral sensitivity of silicon-cell pyranometers compared to the solar radiation spectrum (see graph below), spectral errors occur when measurements are made in conditions that differ from conditions the sensor was calibrated under (e.g., the solar spectrum differs in clear sky and cloudy conditions, thus measurements in cloudy conditions result in spectral error because sensors are calibrated in clear sky conditions).
- Page 15 Spectral error for Apogee SP series pyranometers as a function of solar zenith angle, assuming calibration at a zenith angle of 45°. Spectral error for Apogee SP series pyranometers as a function of atmospheric air mass, assuming calibration at an air mass of 1.5. Spectral Errors for Shortwave Radiation Measurements with Apogee SP Series Pyranometers Radiation Source (Error Calculated Relative to Sun, Clear Sky) Error [%]...
- Page 16 Moisture or debris on the diffuser is a common cause of low readings. The sensor has a domed diffuser and housing for improved self-cleaning from rainfall, but materials can accumulate on the diffuser (e.g., dust during periods of low rainfall, salt deposits from evaporation of sea spray or sprinkler irrigation water) and partially block the optical path.
- Page 17 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.
- Page 18 Compatible Measurement Devices (Dataloggers/Controllers/Meters) Serial Number Range 0-10516. SP-200 series pyranometers are calibrated with a standard calibration factor of 0.5 per mV (SP-212) or 0.25 W m per mV (SP-215), yielding a sensitivity of 2.0 mV per W m or 4.0 mV per W , respectively.
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Page 19: Return 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 What is Covered All products manufactured by Apogee Instruments are warranted to be free from defects in materials and craftsmanship for a period of four (4) years from the date of shipment from our factory. -
Page 20: Other Terms
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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