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Summary of Contents for Apogee Instruments S2-432
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Page 1: Owner's Manual
OWNER’S MANUAL RED - FAR-RED SENSORS Models S2-432 Rev: 2-Aug-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
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 ............................. 10 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
/ 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 sensors 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 5: Sensor Models
SENSOR MODELS This manual covers the Modbus RTU communication protocol, Red - Far-red model S2-432 (in bold below). Additional models are covered in their respective manuals. Model Signal S2-131 Self-powered S2-431 SDI-12 S2-432 Modbus Sensor model number and serial number are located on the bottom of the sensor. -
Page 6: Specifications
SPECIFICATIONS S2-432 Power Supply 5.5 to 24 V DC RS-232 37 mA; Average Max Current Draw RS-485 quiescent 37 mA, active 42 mA Calibration Factor Custom for each sensor and stored in firmware (reciprocal of sensitivity) Calibration Uncertainty ± 5 %... - Page 7 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°...
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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 of corrosion-resistant marine-grade stainless-steel, and designed for extended use in harsh Cable connectors are attached directly to the head. -
Page 10: Operation And Measurement
OPERATION AND MEASUREMENT The S2-432 Red - Far-red sensor has a Modbus output, where red and far-red photon flux density are returned in digital format. Measurement of S2-432 Red - Far-red sensors requires a measurement device with a Modbus interface that supports the Read Holding Registers (0x03) function. - Page 11 Register Index Each register in a sensor represents a value in the sensor, such as a measurement or a configuration parameter. Some registers can only be read, some registers can only be written, and some can be both read and written. Each register exists at a specified index in the table for the sensor.
- Page 12 Read only registers (function code 0x3). Float Registers Red calibrated output µmol Far-red calibrated output µmol Red detector millivolts Far-red detector millivolts Ratio Percentage Far-red Reserved for Future Use device status (1 means device is busy, 0 otherwise) firmware version Integer Registers Red calibrated output µmol (shifted one decimal point to the left) Far-red calibrated µmol (shifted one decimal point to the left)
- Page 13 Far-red mV offset (shifted four decimal points to the left)* running average heater status *Registers marked with an asterisk (*) cannot be written to unless a specific procedure is followed. Contact Apogee Instruments to receive the procedure for writing these registers.
- Page 14 Packet Framing: Apogee sensors use Modbus RTU packets and tend to adhere to the following pattern: Slave Address (1 byte), Function Code (1 byte), Starting Address (2 bytes), Number of Registers (2 bytes), Data Length (1 byte, optional) Data (n bytes, optional) Modbus RTU packets use the zero-based address when addressing registers.
- Page 15 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.
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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 37 mA when the sensor is powered. Any current drain significantly greater than approximately 37 mA indicates a problem with power supply to the sensors, wiring of the sensor, or sensor electronics. -
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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