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Summary of Contents for Apogee SQ-640
- Page 1 OWNER’S MANUAL QUANTUM LIGHT POLLUTION SENSOR Models SQ-640 (including SS models) 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.
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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 ..............................9 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 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 voltage output by the sensor is directly proportional to radiation incident on a planar surface (does not have to be horizontal), where the radiation emanates from all angles of a hemisphere. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the unamplified model SQ-640 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 SDI-12... -
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 Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee SQ-600 series Quantum Light Pollution Sensor is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
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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 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... -
Page 10: Operation And Measurement
In order to maximize the measurement resolution and signal-to-noise ratio, the signal input range of the measurement device should closely match the output range of the PFD sensor. Wiring for SQ-640 White: Positive (signal from sensor) Black: Negative (signal from sensor) - Page 11 Sensor Calibration Apogee SQ-640 Quantum Light Pollution Sensors have standard calibration factors of exactly: 1 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 Calibration Factor (1 µmol m...
- Page 12 The model SQ-620 Extended Range Quantum Sensor can measure a photon flux density range of 0-4000 mol m . The model SQ-640 Quantum Light Pollution Sensor is designed for low light measurements and can only measure a photon flux density range of 0-200 mol m (the sensor will output values beyond, 200 mol m...
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Page 13: Maintenance And Recalibration
Never use an abrasive material or cleaner on the diffuser. It is recommended that two-band radiometers be recalibrated every two years. See the Apogee webpage for details regarding return of sensors for recalibration (http://www.apogeeinstruments.com/tech-support-... -
Page 14: Troubleshooting And Customer Support
1 mega-ohm there is negligible effect on the calibration, even after adding up to 100 m of cable. All Apogee sensors use shielded, twisted pair cable to minimize electromagnetic interference. For best measurements, the shield wire must be connected to an earth ground. This is particularly important when using the sensor with long lead lengths in electromagnetically noisy environments. -
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 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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