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Summary of Contents for Apogee S2-131-SS
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Page 1: Owner's Manual
OWNER’S MANUAL RED - FAR-RED SENSORS Models S2-131 (including SS models) APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2019 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 ..............................8 Cable Connectors ..................................9 Operation and Measurement ..............................10 Maintenance and Recalibration ............................. 12 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
/ sum of red and far-red photon flux densities), in photobiology studies (e.g., researching plant morphogenic activities). Apogee Instruments model S2-131 red - far-red sensors consist of a cast acrylic diffuser, pair of photodiodes that measure specific wavelength ranges (red peak near the red peak of phytochrome absorption and far-red peak near the far-red peak of phytochrome absorption), and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the radiometer to a measurement device. -
Page 5: Sensor Models
0-40 mV S2-431 SDI-12 S2-432 Modbus Sensor model number and serial number are located on the bottom of the sensor. If the manufacturing date of a specific sensor is required, please contact Apogee Instruments with the serial number of the sensor. -
Page 6: Specifications
Calibration Traceability Apogee S2 series Red - Far-Red sensors are calibrated through side-by-side comparison to the mean of three transfer standard sensors under a quartz halogen lamp. The transfer standard sensors are calibrated through side- by-side comparison to red and far-red photon flux density calculated from solar spectra collected in Logan, Utah, using an Apogee model PS-300 spectroradiometer. - Page 7 Directional (cosine) response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee S2 series red / far sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
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Page 8: Deployment And Installation
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 9: 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 10: 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 to 12.5 mV is required to cover the entire range of red and far-red photon flux density from the sun). 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 quantum sensor. - Page 11 Sensor Calibration The Apogee unamplified red - far-red sensor model S2-131 has approximate calibration factors of for the red and far-red sensors: 12 mol m per mV Multiply the calibration factors by the measured voltages to convert sensor outputs to red and far-red photon flux densities (PFD) in units of mol m...
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Page 12: Maintenance And Recalibration
3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water. Apogee Instruments Red - Far-Red sensors 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 13: 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 14: 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 15 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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