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Related Manuals for Apogee S2-121
Summary of Contents for Apogee S2-121
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Page 1: Owner's Manual
Models S2-121 and S2-122 Rev: 5-Nov-2020 Upward (model S2-121) Downward (model S2-122) APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2020 Apogee Instruments, Inc. -
Page 2: Table Of Contents
TABLE OF CONTENTS Owner’s Manual ....................................1 Certificate of Compliance ................................. 3 Introduction ..................................... 4 Sensor Models ..................................5 Specifications ................................... 6 Deployment and Installation ..............................9 Cable Connectors ................................... 11 Operation and Measurement ..............................10 Maintenance and Recalibration ............................. 13 Troubleshooting and Customer Support .......................... -
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 rely on the information provided to us by our material suppliers. -
Page 4: Introduction
Apogee Instruments S2 series two-band sensors consist of a cast acrylic diffuser (upward-looking sensor) or acrylic window (downward-looking sensor), pair of photodiodes that measure specific wavelength ranges, and signal processing circuitry mounted in an anodized aluminum housing. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the analog output models S2-121 and S2-122 (in bold below). Digital models are covered in their respective manuals. Description Model Signal Measures green and yellow irradiance (upward-looking) for S2-121 Voltage Measures green and yellow radiance (downward-looking) -
Page 6: Specifications
The transfer standard PRI sensors are calibrated through side-by-side comparison to the mean of six replicate direct and diffuse solar spectra collected in Logan, Utah, using an Apogee PS-300 spectroradiometer. The Apogee PS-300 spectroradiometer is calibrated with a quartz halogen lamp traceable to... - Page 7 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee S2 series upward-looking sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
- Page 8 Spectral Response Graph of PRI The spectral range of the PRI sensors is defined by a center wavelength of 532 nm with 10 nm full-width half- maximum (Green) and 570 nm with 10 nm full-width half-maximum (Yellow). Measured spectral responses are plotted in the graph.
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Page 9: Deployment And Installation
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 AL-100 Leveling Plate is recommended. - Page 10 Mount the sensor to a solid surface with the nylon mounting screw provided to prevent galvanic corrosion. To facilitate mounting on a mast or pipe, the Apogee Instruments model SM-400 Two Band Radiometer Downward- looking Mounting Bracket is recommended. The bracket can be adjusted to any angle between 0° (sensor pointed...
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Page 11: 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... -
Page 12: Operation And Measurement
OPERATION AND MEASUREMENT Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying or recording a millivolt signal (an input measurement range of approximately 0-25 mV is required to cover the sensor output ranges). In order to maximize measurement resolution and signal-to-noise ratio, the input range of the measurement device should closely match the output range of the sensor. -
Page 13: Maintenance And Recalibration
Never use an abrasive material or cleaner on the diffuser. It is recommended that two-band sensors be recalibrated every two years. See the Apogee webpage for details regarding return of sensors for recalibration (http://www.apogeeinstruments.com/tech-support-recalibration-... -
Page 14: Troubleshooting And Customer Support
1 mega-ohm there is negligible effect on the calibration, even after adding up to 100 m of cable. All Apogee sensors use shielded, twisted pair cable to minimize electromagnetic interference. For best measurements, the shield wire must be connected to an earth ground. This is particularly important when using the sensor with long lead lengths in electromagnetically noisy environments. -
Page 15: 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 16 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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