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Summary of Contents for Apogee Instruments SU-221
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Page 1: Owner's Manual
OWNER’S MANUAL ULTRAVIOLET-A SENSOR Models SU-221 Rev: 26-Oct-2022 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2022 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 ............................. 17 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
SU-200 series outputs an analog voltage that is directly proportional to UV-A radiation incident on a planar surface (does not have to be horizontal) where the radiation emanates from all angles of a hemisphere. SU-221 sensors output a digital signal using SDI-12 communication protocol. -
Page 6: Sensor Models
SENSOR MODELS This manual covers the SDI-12 protocol UV-A sensor model SU-221 (in bold below). Additional models are covered in their respective manuals. Model Signal SU-200 0-10 mV SU-202 0- 2.5 V SU-205 0- 5 V SU-221 SDI-12 A sensor’s model number and serial number are located on the bottom of the sensor. -
Page 7: Specifications
SPECIFICATIONS SU-221-SS Power Supply 5.5 to 24 V DC Current Draw 1.4 mA (quiescent), 1.8 (active) Calibration Factor Custom for each sensor and stored in the firmware Calibration Uncertainty ± 10 % Measurement Range 0 to 100 W m 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-200 series UV-A sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45°...
- Page 9 Spectral Response Spectral response estimate of Apogee SU-200 UV-A sensors. Spectral response was modeled from sensitivity of the photodetector and transmittance of the diffuser.
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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-A 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 environmental conditions. -
Page 12: Operation And Measurement
OPERATION AND MEASUREMENT The SU-221 UV-A sensor has an SDI-12 output; UV radiation is returned in digital format. Measurement of SU-221 UV-A sensors require a measurement device with SDI-12 functionality that includes the M or C command. Wiring White: Positive (signal from sensor) - Page 13 “!”. SDI-12 language supports a variety of commands. Supported commands for the Apogee Instruments SU-221 UV-A sensors are listed in the following table (“a” is the sensor address. The following ASCII Characters are valid addresses: “0-9” or “A-Z”).
- Page 14 Make Measurement Command: M! The make measurement command signals a measurement sequence to be performed. Data values generated in response to this command are stored in the sensor's buffer for subsequent collection using “D” commands. Data will be retained in sensor storage until another “M”, “C”, or “V” command is executed.
- Page 15 0C2! 000101<cr><lf> 0D0! +20.0 0C3! 000101<cr><lf> 0D0! 0+90.2<cr><lf> where 30.0 is watts and 1.0 is mV and 20.0 is µmol Change Sensor Address: aAn! The change sensor address command allows the sensor address to be changed. If multiple SDI-12 devices are on the same bus, each device will require a unique SDI-12 address.
- Page 16 UV-A Measurements and Spectral Errors Apogee Instruments model SU-200 UV-A 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-A radiation from the sun, there are many electric light sources that emit UV-A radiation (e.g., cool white fluorescent, metal halide, mercury arc, and germicidal lamps).
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Page 17: 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-200 series UV-A sensors can block the optical path in three common ways: 1. Moisture or debris build-up on the diffuser. 2. -
Page 18: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality If the sensor does not communicate with the datalogger, use an ammeter to check the current draw. It should be near 1.4 mA when the sensor is not communicating and spike to approximately 1.8 mA when the sensor is communicating. -
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.
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