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Summary of Contents for Apogee S2-141
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Page 1: Owner's Manual
OWNER’S MANUAL PAR-FAR SENSOR Models S2-141 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 ................................... 6 Deployment and Installation ..............................9 Cable Connectors ................................... 10 Operation and Measurement ..............................11 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
(far-red photon flux density / sum of PPFD and far-red photon flux density), in photobiology studies (e.g., researching plant morphogenic activity). Apogee Instruments model S2-141 PAR-FAR sensors consist of a cast acrylic diffuser, pair of photodetectors that measure PAR and far-red wavelength ranges (400-700 nm for PAR, 700-760 nm for far-red), and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the radiometer measurement device is also included. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the analog output PAR-FAR sensor, model S2-141 (listed in bold below). Additional models are covered in their respective manuals. Model Signal S2-141 0-40 mV S2-441 SDI-12 S2-442 Modbus Sensor model number and serial number are located on the bottom of the sensor. -
Page 6: Specifications
Calibration Traceability The PAR sensor in Apogee S2 series PAR-FAR sensors are calibrated through side-by-side comparison to the mean of four transfer standard quantum sensors under a reference lamp. The transfer standard quantum sensors are calibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST). - Page 7 Directional (cosine) response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee S2 series PAR-FAR sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
- Page 8 Spectral Response Spectral response of PAR detector (blue) and Far-red detector (red) compared to the defined response of plants to photons (dashed).
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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 for this purpose. To facilitate mounting on a cross arm, an Apogee Instruments model AM-110 mounting bracket is recommended. -
Page 10: 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 11: Operation And Measurement
DO NOT connect the sensor to a power source. The sensor is self-powered and applying voltage will damage the sensor. Wiring for S2-141 Yellow: Positive (signal from PAR sensor) Blue: Negative (signal from PAR sensor) - Page 12 Sensor Calibration The Apogee unamplified PAR-FAR sensor model S2-141 has approximate calibration factors of: 100 mol m per mV for PAR 50 mol m per mV for Far-red Multiply the calibration factors by the measured voltages to convert sensor outputs to PPFD and far-red photon flux density (PFD) in units of mol m...
- Page 13 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 14 Spectral Errors for Far-red Photon Flux Density Measurements with Apogee S2-141 PAR-FAR Sensors S2-141 Sensor Radiation Source (Error Calculated Relative to Sun, Clear Sky) Far-red Error [%] Sun (Clear Sky) -1.9 Sun (Cloudy Sky) -3.6 Reflected from Grass Canopy -1.4...
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Page 15: Maintenance And Recalibration
3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water. Apogee Instruments 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 Homepage of the Clear Sky Calculator. Two calculators are available: one for quantum sensors (PPFD) and one for pyranometers (total shortwave irradiance). 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 17: 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 18: 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 19 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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