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Summary of Contents for Apogee Instruments S2-431
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Page 1: Owner's Manual
OWNER’S MANUAL RED - FAR-RED SENSORS Models S2-431 Rev: 31-Aug-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. -
Page 2: Table Of Contents
TABLE OF CONTENTS Owner’s Manual ....................................1 Certificates of Compliance ............................... 3 Introduction ..................................... 5 Sensor Models ..................................6 Specifications ................................... 7 Deployment and Installation ..............................9 Cable Connectors ................................... 10 Operation and Measurement ..............................11 Maintenance and Recalibration ............................. 15 Troubleshooting and Customer Support .......................... -
Page 3: Certificates 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 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.
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Page 5: Introduction
/ sum of red and far-red photon flux densities), in photobiology studies (e.g., researching plant morphogenic activities). Apogee Instruments S2 series red - far-red radiometers consist of a cast acrylic diffuser, pair of photodiodes that measure specific wavelength ranges, and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the radiometer to a measurement device. -
Page 6: Sensor Models
SENSOR MODELS This manual covers the SDI-12 model S2-431 (in bold below). Additional models are covered in their respective manuals. Model Signal S2-131 Self-powered S2-431 SDI-12 S2-432 Modbus A sensor’s model number and serial number are located on the bottom of the sensor. If you need... -
Page 7: Specifications
SPECIFICATIONS S2-431 Power Supply 5.5 to 24 V DC Current Draw 1.8 mA (quiescent), 1.9 mA (active) Calibration Factor Custom for each sensor and stored in firmware (reciprocal of sensitivity) Calibration Uncertainty ± 5 % Output Range SDI-12 Measurement Repeatability... - Page 8 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Directional error for Apogee S2 series red - far-red sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
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Page 9: 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 10: 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 11: Operation And Measurement
OPERATION AND MEASUREMENT The S2-431 Red - Far-red sensor has a SDI-12 output, where red and far-red photon flux density is returned in digital format. Measurement of S2-431 Red - Far-red sensors requires a measurement device with SDI-12 functionality that includes the M or C command. - Page 12 Supported Commands for Apogee Instruments S2-400 Series Red - Far-red 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...
- Page 13 The data values are separated by the sign “+”, as in the following example (0 is the address): Command Sensor Response Sensor Response when data is ready 0M0! 00011<cr><lf> 0<cr><lf> 0D0! 0+2.0+20.0<cr><lf> 0M1! 00012<cr><lf> 0<cr><lf> 0D0! 0+200.0+200.0<cr><lf> 0M2! 00012<cr><If> 0<cr><If> 0D0! 0+20.0+20.0<cr><If>...
- Page 14 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. For example, two SDI-12 sensors with the factory address of 0 requires changing the address on one of the sensors to a non-zero value in order for both sensors to communicate properly on the same channel: Command...
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Page 15: Maintenance And Recalibration
3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water. Apogee Instruments Red - Far-red 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 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 1.8 mA when the sensor is not communicating and spike to approximately 1.9 mA when the sensor is communicating. -
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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