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Related Manuals for Apogee Instruments SU-300-SS
Summary of Contents for Apogee Instruments SU-300-SS
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Page 1: Owner's Manual
OWNER’S MANUAL ULTRAVIOLET INDEX & ULTRAVIOLET-B SENSOR Models SU-300-SS Rev: 5-Jan-2023 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2023 Apogee Instruments, Inc. -
Page 2: Table Of Contents
TABLE OF CONTENTS Owner’s Manual ....................................1 Certificates of Compliance ............................... 3 Introduction ..................................... 5 Sensor Models ..................................6 Specifications ................................... 7 Deployment and Installation ..............................10 Cable Connectors ................................... 11 Operation and Measurement ..............................12 Maintenance and Recalibration ............................. 16 Troubleshooting and Customer Support .......................... -
Page 3: Certificates 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 we rely on the information provided to us by our material suppliers. - Page 4 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 we rely on the information provided to us by our material suppliers.
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Page 5: Introduction
Most UV sensors designed for sunlight measurements are sensitive to UV radiation in the UV-A or UV-B ranges. Apogee Instruments SU-300 series UV-I/UV-B sensors detect UV radiation from 270 to 315 nm and are calibrated to output UV Index measurements. UV Index is a relative metric that scales linearly with the intensity of UV radiation that causes sunburn in humans. -
Page 6: Sensor Models
Model Signal SU-300 0-2 mV SU-321 SDI-12 The model number and serial number are located on the bottom of the sensor. If manufacturing date of a sensor is required, please contact Apogee Instruments with the serial number of the sensor. -
Page 7: Specifications
SPECIFICATIONS SU-300-SS Power Supply Self-Powered Output (sensitivity) 0.1 mV per UV Index unit Calibration Factor (reciprocal of 10 UV Index units per mV sensitivity) Calibration Uncertainty ± 10 % Output Range 0 to 2 mV Measurement Range 0 to 20 UV Index Measurement Repeatability Less than 0.5 %... - Page 8 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Directional error for Apogee SU-300 series UV-I/UV-B sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
- Page 9 Spectral Response 10.0000 1.0000 Spectral response estimate of Apogee SU-300 UV-I/UV-B sensors. Spectral response 0.1000 was modeled from sensitivity of the photodetector and transmittance of the 0.0100 diffuser. Gray line is the Erythemal Action Spectrum and provides a relative 0.0010 indication of skin damage caused by UV radiation.
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Page 10: Deployment And Installation
Mount the sensor to a solid surface with the nylon mounting screw provided. To accurately measure UV-I/UV-B 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 11: 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 of corrosion-resistant marine-grade stainless-steel, and designed for extended use in harsh Inline cable connectors are installed 30 cm from the... -
Page 12: Operation And Measurement
OPERATION AND MEASUREMENT Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and displaying or recording a millivolt signal. An input measurement range of approximately 0-2 mV is required to cover the entire range of the SU-300 UV-I/UV-B sensor. To maximize measurement resolution and signal-to-noise ratio, the input range of the measurement device should closely match the output range of the UV sensor. - Page 13 Sensor Calibration The SU-300 has a standard UV calibration factor of exactly: 10.0 UV Index units per mV Multiply this calibration factor by the measured mV signal to convert sensor output to UV Index: Calibration Factor (10 UV Index units per mV) * Sensor Output Signal (mV) = UV Index 10 UV Index units per mV * 1 mV = 10 Full Sunlight Example of UV Index and UV-B measurement with an Apogee...
- Page 14 UV-I/UV-B Measurements and Spectral Errors Apogee Instruments model SU-300 UV-I/UV-B sensors are calibrated to measure ultraviolet radiation from the sun between 300 and 400 nm in Watts per square meter. In addition to naturally occurring UV-I/UV-B radiation from the sun, there are many electric light sources that emit UV-I/UV-B radiation (e.g., cool white fluorescent, metal halide, mercury arc, and germicidal lamps).
- Page 15 and mol m Converting from UV Index to UV-B in Units of W m There is a relatively linear relationship between UV Index and UV-B irradiance for sunlight (see graph below), suggesting UV-B irradiance can be approximated from UV Index measurements from the SU-300 UV-I/UV-B sensor. To convert from UV Index to UV irradiance in units of W m , divide UV Index by 5.7 (slope of the line in the graph below).
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Page 16: Maintenance And Recalibration
MAINTENANCE AND RECALIBRATION Blocking of the optical path between the target and detector can cause low readings. Occasionally, accumulated materials on the diffuser of the SU-300 UV-I/UV-B sensor can block the optical path in three common ways: 1. Moisture or debris build-up on the diffuser. 2. -
Page 17: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality Apogee SU-300 sensors are self-powered devices and output a voltage signal proportional to incident UV-I/UV-B radiation. A quick and easy check of sensor functionality can be determined using a voltmeter with millivolt resolution. -
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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