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Related Manuals for Apogee Instruments SQ-212
Summary of Contents for Apogee Instruments SQ-212
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Page 1: Owner's Manual
QUANTUM SENSOR Model SQ-212, SQ-222, SQ-215, and SQ-225 (including SS models, formerly smaller) 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
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 ..............................11 Maintenance and Recalibration ............................. 17 Troubleshooting and Customer Support ..........................19 Return and Warranty Policy .............................. -
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 quantum sensor models SQ-212/SQ/222 and SQ-215/SQ-225, which provide a voltage signal. Additional models are covered in their respective manuals. Model Signal Calibration SQ-212 0-2.5 V Sunlight SQ-222 0-2.5 V Electric light SQ-215 0-5 V Sunlight... -
Page 6: Specifications
Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m Dimensions Serial # 10574 (SQ-212), 10274 30.5 mm diameter, 37 mm height (SQ-222), 10434 (SQ-215), 10534 (SQ-225) and above... - Page 7 Calibration Traceability Apogee SQ series quantum sensors are calibrated through side-by-side comparison to the mean of transfer standard quantum sensors under a reference lamp. The reference quantum sensors are recalibrated with a 200 W quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST). Spectral Response Mean spectral response of six SQ-100 series quantum sensors (error bars...
- Page 8 Cosine Response Directional (cosine) response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee SQ-100 series quantum sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
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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 to level the sensor when used on a flat surface or being mounted to surfaces such as wood. To facilitate mounting on a mast or pipe, the Apogee Instruments model AL-120 Solar Mounting Bracket with Leveling Plate is recommended. -
Page 10: 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 11: Operation And Measurement
Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying or recording a voltage signal with a range of 0-2.5 V (SQ-212/222) or 0-5 V (SQ-215/225) to cover the entire range of PPFD from the sun. 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 quantum sensors. - Page 12 Sensor Calibration Serial Number Range 0-8381. Apogee amplified quantum sensor models have a standard PPFD calibration factor of exactly: SQ-212, SQ-222: 1.0 µmol m per mV SQ-215, SQ-225: 0.5 µmol m per mV Multiply this calibration factor by the measured mV signal to convert sensor output to PPFD in units of µmol m Calibration Factor (0.5 µmol m...
- Page 13 Spectral Error The combination of diffuser transmittance, interference filter transmittance, and photodetector sensitivity yields spectral response of a quantum sensor. A perfect photodetector/filter/diffuser combination would exactly match the defined plant photosynthetic response to photons (equal weighting to all photons between 400 and 700 nm, no weighting of photons outside this range), but this is challenging in practice.
- Page 14 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 15 Correlation between photosynthetic photon flux density (PPFD) and yield photon flux density (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 16 Immersion Effect Correction Factor When a radiation sensor is submerged in water, more of the incident radiation is backscattered out of the diffuser than when the sensor is in air (Smith, 1969; Tyler and Smith, 1970). This phenomenon is caused by the difference in the refractive index for air (1.00) and water (1.33), and is called the immersion effect.
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Page 17: 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 18 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.
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Page 19: Troubleshooting And Customer Support
Serial Numbers 0-8381. SQ-200 series quantum sensors are calibrated with a standard calibration factor of 1.0 µmol m per mV (SQ-212 and SQ-222) or 0.5 µmol m per mV (SQ-215 and SQ-225), yielding a sensitivity of 1 mV per µmol m (SQ-212 and SQ-222) or 2 mV per µmol m... - Page 20 Unit Conversion Charts Apogee SQ series quantum sensors are calibrated to measure PPFD in units of µmol m . Units other than photon flux density (e.g., energy flux density, illuminance) may be required for certain applications. It is possible to convert the PPFD value from a quantum sensor to other units, but it requires spectral output of the radiation source of interest.
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Page 21: 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 22 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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