Apogee Instruments SQ-617 Owner's Manual
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Summary of Contents for Apogee Instruments SQ-617
- Page 1 OWNER’S MANUAL EPAR SENSOR Model SQ-617 Rev: 22-Mar-2021 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2021 Apogee Instruments, Inc.
- Page 2 TABLE OF CONTENTS Owner’s Manual ................................1 Certificate of Compliance ............................3 Introduction ................................4 Sensor Models ............................... 5 Specifications ................................. 5 Deployment and Installation ..........................9 Cable Connectors ..............................9 Operation and Measurement ..........................11 Maintenance and Recalibration .......................... 16 Troubleshooting and Customer Support ......................
- Page 3 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 4 380-760 nm, which allows it to measure photons from UV and Far-red. Apogee Instruments SQ-600 series ePAR sensors consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodized aluminum housing. A cable to connect the sensor to a measurement device is also included.
- Page 5 SENSOR MODELS This manual covers the digital model SQ-617 ePAR SDI-12 Sensor (in bold below). Additional models are covered in their respective manuals. Model Signal SQ-610 Self-powered SQ-612 0-2.5 V SQ-614 4-20 mA SQ-615 0-5 V SQ-616 SQ-617 SDI-12 SQ-618...
- Page 6 4 years against defects in materials and workmanship Calibration Traceability Apogee Instruments SQ-600 series ePAR sensors are calibrated through side-by-side comparison to the mean of four transfer standard sensors under a reference lamp. The transfer standard sensors are recalibrated with a...
- Page 7 Spectral Response Mean spectral response measurements of four replicate Apogee SQ-600 series ePAR Sensors. Incremental spectral response measurements were made at 10 nm increments across a wavelength range of 370 to 800 nm in a monochromator with an attached electric light source. Measured spectral data from each quantum sensor were refined and normalized by comparing measured spectral response of the...
- Page 8 Cosine Response Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee SQ-600 series ePAR Sensor is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
- Page 9 An Apogee Instruments model AL-100 leveling plate is recommended for this purpose. To facilitate mounting on a cross arm, an Apogee Instruments model AL- 120 mounting bracket is recommended.
- Page 10 CABLE CONNECTORS Apogee offers 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 Cable connectors are attached directly to the head.
- Page 11 “!”. SDI-12 language supports a variety of commands. Supported commands for the Apogee Instruments SQ-617 ePAR 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 12 Supported Commands for Apogee Instruments SQ-617 ePAR Sensors Instruction Name Instruction Syntax Description Acknowledge Active Command Responds if the sensor with address a is on the line Send Identification Command Responds with sensor information Measurement Command Tells the sensor to take a measurement...
- Page 13 0M3! 00011<cr><If> 0<cr><If> 0D0! 0+2000.0<cr><If> 0M4! a0011<cr><If> 0<cr><lf> 0D0! 0+90.2<cr><lf> where 2000.0 is µmol m Concurrent Measurement Command: aC! A concurrent measurement is one which occurs while other SDI-12 sensors on the bus are also making measurements. This command is similar to the “aM!” command, however, the nn field has an extra digit and the sensor does not issue a service request when it has completed the measurement.
- Page 14 Command Response Description aAb! b<cr><lf> Change the address of the sensor where a is the current (old) sensor address (“0-9”, “A-Z”), A is an upper-case ASCII character denoting the instruction for changing the address, b is the new sensor address to be programmed (“0-9”, “A-Z”), and ! is the standard character to execute the command.
- Page 15 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.
- Page 16 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 17 TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality If the sensor does not communicate with the datalogger, use an ammeter to check the current drain. 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 18 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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