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Related Manuals for Apogee Instruments SQ-647
Summary of Contents for Apogee Instruments SQ-647
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Page 1: Owner's Manual
OWNER’S MANUAL QUANTUM LIGHT POLLUTION SENSOR Model SQ-647 Rev: 28-Oct-2020 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2020 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 ................................. 5 Deployment and Installation ..........................8 Cable Connectors ..............................8 Operation and Measurement ..........................10 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 rely on the information provided to us by our material suppliers. -
Page 4: Introduction
SQ-600 series sensors are designed for continuous photon flux density measurements in indoor environments under LEDs. The SQ-640 Quantum Light Pollution models output a voltage that is directly proportional to photon flux density. The SQ-647 sensors output a digital signal using SDI-12 communication protocol. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the digital model SQ-647 SDI-12 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 SQ-646 SQ-647... -
Page 6: Specifications
(316), M8 connector 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... - 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 AM- 110 mounting bracket is recommended. -
Page 9: Cable Connectors
CABLE CONNECTORS Apogee started offering cable connectors on some bare-lead sensors in March 2018 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). -
Page 10: Operation And Measurement
“!”. SDI-12 language supports a variety of commands. Supported commands for the Apogee Instruments SQ-627 Extended Range PFD sensors are listed in the following table (“a” is the sensor address. The following ASCII Characters are valid addresses: “0-9” or “A-Z”). - Page 11 Supported Commands for Apogee Instruments SQ-647 Quantum Light Pollution Sensors Instruction Name Instruction Syntax Description Acknowledge Active Command Responds if the sensor with address a is on the line Send Identification Command Responds with sensor information Measurement Command Tells the sensor to take a measurement...
- Page 12 0M3! 00011<cr><If> 0<cr><If> 0D0! 0+2000.0<cr><If> 0M4! a0011<cr><If> 0<cr><lf> 0D0! 0+90.2<cr><lf> where 2000.0 is µmol m 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 13 Command Response Description aAb! b<cr><lf> Change the address of the sensor 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.
- Page 14 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 far 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 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
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality If the sensor does not communicate with the datalogger, use an ammeter to check the current draw. 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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