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Related Manuals for Apogee Instruments S2-441
Summary of Contents for Apogee Instruments S2-441
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Page 1: Owner's Manual
OWNER’S MANUAL PAR-FAR SENSOR Models S2-441 Rev: 31-Mar-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 Certificate of Compliance ................................. 3 Introduction ..................................... 4 Sensor Models ..................................5 Specifications ................................... 6 Deployment and Installation ..............................9 Cable Connectors ................................... 10 Operation and Measurement ..............................11 Maintenance and Recalibration ............................. 15 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
(far-red photon flux density / sum of PPFD and far-red photon flux density), in photobiology studies (e.g., researching plant morphogenic activity). Apogee Instruments S2 series PAR-FAR sensors consist of a cast acrylic diffuser, pair of photodetectors that measure PAR and far-red wavelength ranges (400-700 nm for PAR, 700-760 nm for far-red), and signal processing circuitry mounted in an anodized aluminum housing. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the SDI-12 model S2-441 (in bold below). Additional models are covered in their respective manuals. Model Signal S2-141 Voltage S2-441 SDI-12 S2-442 Modbus A sensor’s model number and serial number are located on the bottom of the sensor. If you need... -
Page 6: Specifications
LEDs (735 nm peak, 710-760 nm range). The transfer standard far-red sensors are calibrated against a spectroradiometer (Apogee Instruments model PS-300) under the same far-red LEDs. The spectroradiometer is calibrated with a quartz halogen lamp... - Page 7 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee S2 series PAR-FAR sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively. Mean directional (cosine) response of seven apogee PAR-FAR sensors.
- Page 8 Spectral Response Spectral response of PAR detector (blue) and Far-red detector (red) compared to the defined response of plants to radiation (dashed).
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Page 9: Deployment And Installation
Mount the sensor to a solid surface with the nylon mounting screw provided. To accurately measure PPFD incident on a horizontal surface, the sensor must be level. An Apogee Instruments model AL-100 leveling plate is recommended for this purpose. To facilitate mounting on a cross arm, an Apogee Instruments model AM-110 mounting bracket 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 S2-441 PAR-FAR sensor has a SDI-12 output, where PPFD and far-red photon flux density are returned in digital format. Measurement of S2-441 PAR-FAR 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 PAR-FAR 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 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+400.0+20.0<cr><lf> 0M2! 00012<cr><If> 0<cr><If> 0D0! 0+40.0+2.0<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 PAR-FAR 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 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 1.4 mA when the sensor is not communicating and spike to approximately 1.8 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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