Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Apogee SQ-514
Summary of Contents for Apogee SQ-514
-
Page 1: Owner's Manual
OWNER’S MANUAL QUANTUM SENSOR Model SQ-514 Rev: 16-Mar-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 ..........................9 Cable Connectors ..............................10 Operation and Measurement ..........................10 Maintenance and Recalibration .......................... 16 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
(transmitted) PPFD measurement in the same environments. Apogee Instruments SQ series quantum 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 quantum sensor, model SQ-514 (listed in bold below). Additional models are covered in their respective manuals. Model Signal SQ-514 4-20 mA SQ-500 Self-powered SQ-512 0-2.5 V SQ-515 0-5 V SQ-520 SQ-521... -
Page 6: Specifications
(316), M8 connector Calibration Traceability Apogee Instruments SQ-500 series quantum sensors are calibrated through side-by-side comparison to the mean of four transfer standard quantum sensors under a reference lamp. The reference quantum sensors are... - Page 7 Spectral Response Mean spectral response measurements of six replicate Apogee SQ-100 (original) and SQ-500 (full-spectrum) series quantum sensors. Spectral response measurements were made at 10 nm increments across a wavelength range of 300 to 800 nm with a monochromator and an attached electric light source.
- Page 8 Directional (cosine) response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee SQ-500 series quantum sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
-
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 AL-120 mounting bracket is recommended. -
Page 10: Cable Connectors
Instructions Pins and Wiring Colors: All Apogee connectors have six pins, but not all pins are used for every sensor. There may also be unused wire colors inside the cable. To simplify datalogger connection, we remove the unused pigtail lead colors at the datalogger end of the cable. -
Page 11: Operation And Measurement
Black: Ground (for sensor signal and input power) Clear: Shield/Ground Sensor Calibration Apogee SQ-514 sensors have a standard PPFD calibration factor of exactly: 250.0 µmol m per mA Multiply this calibration factor by the measured mA signal to convert to PPFD in units of µmol m Calibration Factor (250 µmol m... - Page 12 Spectral errors for PPFD measurements made under common radiation sources for growing plants were calculated for Apogee SQ-100 and SQ-500 series quantum sensors using the method of Federer and Tanner (1966). This method requires PPFD weighting factors (defined plant photosynthetic response), measured sensor spectral response (shown in Spectral Response section on page 7), and radiation source spectral outputs (measured with a spectroradiometer).
- Page 13 Yield Photon Flux Density (YPFD) Measurements Photosynthesis in plants does not respond equally to all photons. Relative quantum yield (plant photosynthetic efficiency) is dependent on wavelength (green line in figure below) (McCree, 1972a; Inada, 1976). This is due to the combination of spectral absorptivity of plant leaves (absorptivity is higher for blue and red photons than green photons) and absorption by non-photosynthetic pigments.
- Page 14 (YPFD) for multiple different radiation sources. YPFD is approximately 90 % of PPFD. Measurements were made with a spectroradiometer (Apogee Instruments model PS-200) and weighting factors shown in the previous figure were used to calculate PPFD and YPFD.
- Page 15 Apogee SQ-500 series quantum sensors have an immersion effect correction factor of 1.25 (serial number 3734 and above) or 1.32 (serial numbers 0-3733). This correction factor should be multiplied by PPFD measurements made underwater to yield accurate PPFD.
-
Page 16: Maintenance And Recalibration
Never use abrasive material or cleaner on the diffuser. Although Apogee sensors are very stable, nominal accuracy drift is normal for all research-grade sensors. To ensure maximum accuracy, we generally recommend sensors are sent in for recalibration every two years, although you can often wait longer according to your particular tolerances. - Page 17 Homepage of the Clear Sky Calculator. Two calculators are available: one for quantum sensors (PPFD) and one for pyranometers (total shortwave radiation). Clear Sky Calculator for quantum sensors. Site data are input in blue cells in middle of page and an estimate of PPFD is returned on right-hand side of page.
-
Page 18: Troubleshooting And Customer Support
Independent Verification of Functionality Apogee SQ-514 series quantum sensors provide a 4-20 mA output that is proportional to incident PPFD. A quick and easy check of sensor functionality can be determined using a DC power supply and an ammeter. Power the sensor with a DC voltage by connecting the positive voltage signal to the red wire from the sensor and the negative (or common) to the black wire from the sensor. -
Page 19: 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 20 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.
Need help?
Do you have a question about the SQ-514 and is the answer not in the manual?
Questions and answers