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Summary of Contents for Apogee Instruments S2-411
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Page 1: Owner's Manual
Models S2-411 and S2-412 Rev: 11-Mar-2022 Downward (model S2-412) Upward (model S2-411) 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. -
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 ..............................12 Maintenance and Recalibration ............................. 17 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 we 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 SDI-12 output models S2-411 and S2-412 (in bold below). Additional models are covered in their respective manuals. Description Model Signal Measures red and NIR irradiance (upward-looking) for NDVI S2-111 Voltage Measures red and NIR irradiance (downward- looking ) for NDVI... -
Page 6: Specifications
SPECIFICATIONS NDVI S2-411-SS S2-412-SS (upward-looking) (downward-looking) Calibration Factor (reciprocal of Custom for each sensor and stored in firmware sensitivity)** Calibration Uncertainty ± 5 % Output Range** SDI-12 Power Supply 5.5 to 24 V DC Red detector = 650 nm with 10 nm FWHM*... - Page 7 Error for Apogee S2 series NDVI sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively. Upward- and Downward-looking Two-band Sensors Upward (model S2-411) Downward (model S2-412)
- Page 8 Spectral Response Graph of NDVI The spectral range of the NDVI sensors is defined by a center wavelength of 650 nm with 65 ± 5 nm nm full-width half-maximum (Red) and 810 nm with 65 nm full- ± 5 nm width half-maximum (NIR).
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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 of corrosion-resistant marine-grade stainless-steel, and designed for extended use in harsh Cable connectors are attached directly to the head. -
Page 12: Operation And Measurement
OPERATION AND MEASUREMENT The S2-400 series two-band sensors have an SDI-12 output, where irradiance or radiance is returned in digital format. Measurement of S2-400 series two-band sensors requires a measurement device with SDI-12 functionality that includes the M or C command. Wiring for S2-400 series White: Output Signal Red: Power in (4.5-24 V DC) - Page 13 “!”. SDI-12 language supports a variety of commands. Supported commands for the Apogee Instruments S2-400 series two-band radiometers are listed in the following table (“a” is the sensor address. The following ASCII Characters are valid addresses: “0-9” or “A-Z”). Please note that SDI-12 commands are...
- Page 14 Supported Commands for Apogee Instruments S2-400 Series NDVI Sensors Instruction Name Instruction Syntax Description Used when the address is unknown to have the sensor Address Query Command identify its address, all sensors on data line respond Change Address Command aAb!
- Page 15 Command Sensor Response Sensor Response when data is ready 0M0! 00012<cr><lf> 0<cr><lf> 0D0! 0+0.010+0.109<cr><lf> 0M1! 00012<cr><lf> 0<cr><lf> 0D0! 0+0.2858+3.3905<cr><If> 0M2! 00011<cr><If> 0<cr><If> 0D0! 0+0.8445<cr><lf> 0M3! 00013<cr><If> 0<cr><If> 0D0! 0+35.2<cr><If> where 0.010 and 0.109 are the two Watts m⁻² measurements for lower and upper wavelengths respectively, 0.2858 and 3.3905 are the two mV signals, and 0.8445 is the estimated NDVI value.
- Page 16 where 0.010 and 0.109 are the two measurements for lower and upper wavelengths respectively, 0.2858 Watts m⁻² and 3.3905 are the two mV signals, and 0.8445 is the estimated NDVI value. Change Sensor Address: aAb! The change sensor address command allows the sensor address to be changed. If multiple SDI-12 devices are on the same bus, each device will require a unique SDI-12 address.
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Page 17: Maintenance And Recalibration
3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water. Apogee Instruments upward-looking 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 18: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality The simplest way to check sensor functionality is the aM2! command. This command returns calibrated outputs from each detector. Detector temperature should read very near room temperature. When the diffuser or aperture of the sensor is covered (no incident radiation), the outputs should read very near 0 Watts m⁻²... -
Page 19: 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 20 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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