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Summary of Contents for Apogee SQ-618
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Page 1: Owner's Manual
OWNER’S MANUAL EPAR SENSOR Model SQ-618 Rev: 1-Feb-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
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 ..........................10 Maintenance and Recalibration .......................... 16 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
A cable to connect the sensor to a measurement device is also included. SQ-600 series ePAR sensors are designed for continuous photon flux density measurements in indoor or outdoor environments. The SQ-618 sensors output a digital signal using Modbus RTU protocol over RS- 232 or RS-485. -
Page 5: Sensor Models
SENSOR MODELS This manual covers the Modbus RTU communication protocol, ePAR sensor model SQ-618 (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... -
Page 6: Specifications
(316), M8 connector 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...
- Page 8 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.
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Page 9: Deployment And Installation
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
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,... -
Page 11: Operation And Measurement
Sensor addresses Each sensor is given an address from 1 to 247. Apogee sensors are shipped with a default address of 1. If using multiple sensors on the same Modbus line, the sensor’s address will have to be changed by writing the Slave... - Page 12 1. The other indexing scheme is called zero-based numbering, where the first register is given the index 0, and is thereby accessed by requesting access to register 0. Apogee Sensors use zero-based numbering. However, if using the sensor in a system that uses one-based numbering, such as using a CR1000X logger, adding 1 to the zero-based address will produce the one-based address for the register.
- Page 13 Read only registers (function code 0x3). Float Registers calibrated output µmol m⁻² s⁻¹ detector millivolts immersed output µmol m⁻² s⁻¹ solar output µmol m⁻² s⁻¹ Reserved for Future Use device status (1 means device is busy, 0 otherwise) firmware version Integer Registers calibrated output µmol m⁻²...
- Page 14 *Registers marked with an asterisk (*) cannot be written to unless a specific procedure is followed. Contact Apogee Instruments to receive the procedure for writing these registers Write only registers (function code 0x10). Integer Registers Writing to this register resets Coefficients to firmware defaults.
- Page 15 Packet Framing: Apogee sensors use Modbus RTU packets and tend to adhere to the following pattern: Slave Address (1 byte), Function Code (1 byte), Starting Address (2 bytes), Number of Registers (2 bytes), Data Length (1 byte, optional) Data (n bytes, optional) Modbus RTU packets use the zero-based address when addressing registers.
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Page 16: Maintenance And Recalibration
Never use abrasive material or cleaner on the diffuser. It is recommended that sensors be recalibrated every two years. See the Apogee webpage for details regarding return of sensors for recalibration (http://www.apogeeinstruments.com/tech-support-recalibration-repairs/). -
Page 17: Troubleshooting And Customer Support
Cable Length All Apogee sensors use shielded cable to minimize electromagnetic interference. For best communication, 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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