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Related Manuals for Apogee Instruments SQ-612
Summary of Contents for Apogee Instruments SQ-612
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Page 1: Owner's Manual
OWNER’S MANUAL EPAR SENSOR Models SQ-612 and SQ-615 Rev: 4-Jan-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 ..................................6 Specifications ................................... 7 Deployment and Installation ..............................10 Cable Connectors ................................... 11 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
383-757 nm ± 5 nm, which allows it to measure photons from Far-red. Apogee Instruments SQ-600 series ePAR sensors consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodized aluminum housing. A cable to connect the sensor to a measurement device is also included. - Page 5 Zhen and Van Iersel. 2017. Far-red light is needed for efficient photochemistry and photosynthesis. Journal of Plant Physiology. 209: 115–122. Zhen et al. 2019. Far-red light enhances photochemical efficiency in a wavelength-dependent manner. Physiologia Plantarum. 167(1):21-33. Zhen and Bugbee. 2020a. Far-red photons have equivalent efficiency to traditional photosynthetic photons: Implications for redefining photosynthetically active radiation.
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Page 6: Sensor Models
SENSOR MODELS This manual covers the amplified voltage output ePAR Sensors, models SQ-612 and SQ-615 (in bold below). Additional models are covered in their respective manuals. Model Signal SQ-610 Self-powered SQ-612 0-2.5 V SQ-614 4-20 mA SQ-615 0-5 V SQ-616... -
Page 7: Specifications
4 years against defects in materials and workmanship Calibration Traceability Apogee Instruments SQ-600 series ePAR sensors are calibrated through side-by-side comparison to the mean of four transfer standard sensors under a reference lamp. The transfer standard sensors are recalibrated with a... - Page 8 Spectral Response Mean spectral response measurements of four replicate Apogee SQ-600 series ePAR Sensors. Incremental spectral response measurements were made at 10 nm increments across a wavelength range of 370 to 800 nm in a monochromator with an attached electric light source. Measured spectral data from each quantum sensor were refined and normalized by comparing measured spectral response of the...
- Page 9 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee SQ-600 series ePAR Sensor is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
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Page 10: Deployment And Installation
An Apogee Instruments model AL-100 leveling plate is recommended for this purpose. To facilitate mounting on a cross arm, an Apogee Instruments model AL- 120 mounting bracket is recommended. -
Page 11: Cable Connectors
CABLE CONNECTORS Apogee offers 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
Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying or recording a millivolt signal (an input measurement range of approximately 0-2.5 V (SQ-612) or 0-5 V (SQ-615) is required to cover the entire range of ePAR from the sun). To maximize measurement resolution and signal-to- noise ratio, the input range of the measurement device should closely match the output range of the ePAR sensor. - Page 13 Sensor Calibration Apogee SQ-612 and SQ-615 ePAR Sensors have standard calibration factors of exactly: SQ-612: 1.6 µmol m per mV SQ-615: 0.8 µmol m per mV Multiply the calibration factor by the measured mV signal to convert sensor output to photon flux density in units of µmol m...
- Page 14 Spectral Error Quantum sensors are the most common instrument for measuring PPFD, because they are about an order of magnitude lower cost the spectroradiometers, but spectral errors must be considered. The spectral errors in the table below can be used as correction factors for individual radiation sources. Spectral Errors for PPFD Measurements with Apogee SQ-610 Series ePAR Sensors SQ-610 Series Radiation Source (Error Calculated Relative to Sun, Clear Sky)
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Page 15: 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 16: Troubleshooting And Customer Support
(SQ-615). Thus, a compatible measurement device (e.g., datalogger or controller) should have resolution of at least 0.6 mV (SQ-612) or 1.3 mV (SQ-615) in order to provide photon flux density resolution of 1 µmol m An example datalogger program for Campbell Scientific dataloggers can be found on the Apogee webpage at https://www.apogeeinstruments.com/downloads/#datalogger. -
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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