Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Apogee Instruments SU-321
Summary of Contents for Apogee Instruments SU-321
-
Page 1: Owner's Manual
OWNER’S MANUAL ULTRAVIOLET INDEX & ULTRAVIOLET-B SENSOR Models SU-321 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 ............................. 18 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.
-
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
SENSOR MODELS This manual covers the SDI-12 protocol UV-I/UV-B sensor model SU-321 (in bold below). Additional models are covered in their respective manuals. Model Signal SU-300 0-2 mV SU-321 SDI-12 A sensor’s model number and serial number are located on the bottom of the sensor. If you need the... -
Page 7: Specifications
SPECIFICATIONS SU-321-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 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 Spectral response estimate of 1.0000 Apogee SU-300 UV-I/UV-B sensors. Spectral response was modeled from sensitivity of the 0.1000 photodetector and transmittance of the diffuser. Gray line is the Erythemal Action 0.0100 Spectrum and provides a relative indication of skin damage caused by UV radiation.
-
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 environmental conditions. -
Page 12: Operation And Measurement
OPERATION AND MEASUREMENT The SU-321 UV-I/UV-B sensor has an SDI-12 output; UV radiation is returned in digital format. Measurement of SU- 321 UV-I/UV-B sensors require a measurement device with SDI-12 functionality that includes the M or C command. Wiring for SU-321... - 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 For example (0 is the address): Command Sensor Response 0C0! 000101<cr><lf> 0D0! +3.0<cr><lf> 0C1! 000101<cr><lf> 0D0! +30.0<cr><lf> 0C2! 000101<cr><lf> 0D0! +6.0 0C3! 000101<cr><lf> 0D0! +12.0<cr><lf> 0C4! 000101<cr><lf> 0D0! 0+90.2<cr><lf> where 3.0 is the UV Index, 30.0 is watts, 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.
- Page 16 1 to 100. 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...
- Page 17 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).
-
Page 18: 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 series UV-I/UV-B sensors can block the optical path in three common ways: 1. Moisture or debris build-up on the diffuser. 2. -
Page 19: 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 20 NOTE: Remove protective cap before using any sensor.
-
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.
Need help?
Do you have a question about the SU-321 and is the answer not in the manual?
Questions and answers