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Upward (model S2-421)
APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM
OWNER'S MANUAL
PRI SENSORS
Models S2-421 and S2-422
Rev: 31-Aug-2022
Copyright © 2022 Apogee Instruments, Inc.
Instrument Expert
Original factory packaging
www.dorgean.com
Downward (model S2-422)
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Summary of Contents for Apogee Instruments S2-421
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Page 1: Owner's Manual
Models S2-421 and S2-422 Rev: 31-Aug-2022 Downward (model S2-422) Upward (model S2-421) 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 ..............................10 Cable Connectors ................................... 12 Operation and Measurement ..............................13 Maintenance and Recalibration ............................. 18 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
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, signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. -
Page 6: Sensor Models
SENSOR MODELS This manual covers SDI-12 output models S2-421 and S2-422 (in bold below). Additional models are covered in their respective manuals. Description Model Signal Measures green and yellow irradiance (upward- looking ) for PRI S2-121 Voltage Measures green and yellow irradiance (downward- looking ) for PRI... -
Page 7: Specifications
SPECIFICATIONS S2-421-SS S2-422-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 Green detector = 532 nm with 10 nm FWHM*... - Page 8 Error for Apogee S2 series PRI sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively. Upward- and Downward-looking Two-band Sensors Upward (model S2-421) Downward (model S2-422)
- Page 9 Spectral Response Graph of PRI The PRI sensors have the spectral ranges of 532 nm with 10 nm full- width half-maximum (Green) and 570 nm with 10 nm full-width half- maximum (Yellow). The spectral responses can be seen in the graph to the left.
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Page 10: 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 11 Downward-looking sensor mounting 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.
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Page 12: 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, Cable connectors are attached directly to the head. -
Page 13: 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 14 “!”. 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 case-sensitive.
- Page 15 Make Measurement Command: M! The make measurement command signals a measurement sequence to be performed. Data values generated in response to this command are stored in the sensor's buffer for subsequent collection using “D” commands. Data will be retained in sensor storage until another “M”, “C”, or “V” command is executed. M commands are shown in the following examples: Command Response...
- Page 16 Concurrent Measurement Command: aC! A concurrent measurement is one which occurs while other SDI-12 sensors on the bus are also making measurements. This command is similar to the “aM!” command, however, the nn field has an extra digit and the sensor does not issue a service request when it has completed the measurement.
- Page 17 Command Response Description aAb! b<cr><lf> Change the address of the sensor (see example below) where a is the current (old) sensor address (“0-9”, “A-Z”), A is an upper-case ASCII character denoting the instruction for changing the address, b is the new sensor address to be programmed (“0-9”, “A-Z”), and ! is the standard character to execute the command.
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Page 18: 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 19: 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 20: 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 21 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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