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Summary of Contents for Apogee Instruments SQ-642
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Page 1: Owner's Manual
OWNER’S MANUAL QUANTUM LIGHT POLLUTION SENSOR Models SQ-642 and SQ-645 Rev: 4-Oct-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 ............................. 13 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
This means this particular sensor should only be used for photon flux density measurements under LEDs. Apogee Instruments SQ-600 series Quantum Light Pollution Sensors consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the amplified voltage output models SQ-642 and SQ-645 Quantum Light Pollution Sensor (in bold below). Additional models are covered in their respective manuals. Model Signal SQ-640 Self-powered SQ-642 0-2.5 V SQ-644 4-20 mA SQ-645 0-5 V... -
Page 6: Specifications
4 years against defects in materials and workmanship Calibration Traceability Apogee Instruments SQ-600 series quantum light pollution sensors are calibrated through side-by-side comparison to the mean of four transfer standard quantum light pollution sensors under a reference lamp. The transfer standard quantum light pollution sensors are recalibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST). - Page 7 Spectral Response Mean spectral response measurements of six replicate Apogee SQ-600 series Quantum Light Pollution Sensors. Spectral response measurements were made at 10 nm increments across a wavelength range of 300 to 1100 nm in a monochromator with an attached electric light source. Measured spectral data from each quantum light pollution sensor were normalized by the measured spectral response of the...
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Page 8: 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 9: Cable Connectors
CABLE CONNECTORS Apogee started offering 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
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-642) or 0-5 V (SQ-645) is required to cover the entire range of PFD 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 extended range PFD sensor. - Page 11 Sensor Calibration Apogee SQ-642 and SQ-645 Quantum Light Pollution Sensors have standard calibration factors of exactly: SQ-642: 0.08 µmol m per mV SQ-645: 0.04 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 12 Low Light Measurements Accurate low light measurements are required in flowering and light pollution studies. Research indicates flowering can be triggered in some plants at photosynthetic and/or fa-red photon flux densities less than 0.1 mol . The threshold photon flux density at which flowering is triggered is variable among species. Two of the most light-sensitive species are Poinsettias and Cannabis.
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Page 13: 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 14: Troubleshooting And Customer Support
µmol m (SQ-645). Thus, a compatible measurement device (e.g., datalogger or controller) should have resolution of at least 12.5 mV (SQ-642) or 25 mV (SQ-645) 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 15: 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 16 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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