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Related Manuals for Apogee Instruments PAR-FAR
Summary of Contents for Apogee Instruments PAR-FAR
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Page 1: Owner's Manual
OWNER’S MANUAL PAR-FAR SENSOR Models S2-442 Rev: 31-Mar-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 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 ............................. 15 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 we rely on the information provided to us by our material suppliers. -
Page 4: Introduction
PAR-FAR sensors. The primary application of PAR-FAR sensors is monitoring plant light environments, including calculation of the far- red fraction (far-red photon flux density / sum of PPFD and far-red photon flux density), in photobiology studies (e.g., researching plant morphogenic activity). -
Page 5: Sensor Models
SENSOR MODELS This manual covers the Modbus RTU communication protocol, PAR-FAR sensor model S2-442 (in bold below). Additional models are covered in their respective manuals. Model Signal S2-141 Self-powered S2-441 SDI-12 S2-442 Modbus A sensor’s model number and serial number are located on the bottom of the sensor. -
Page 6: Specifications
(316), M8 connector Calibration Traceability The PAR sensor in Apogee S2 series PAR-FAR sensors are calibrated through side-by-side comparison to the mean of four transfer standard quantum sensors under a reference lamp. The transfer standard quantum sensors are calibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST). - Page 7 Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee S2 series PAR-FAR sensors is approximately ± 2 % and ± 5 % at solar zenith angles of 45° and 75°, respectively.
- Page 8 Spectral Response Spectral response of PAR detector (blue) and Far Red detector (red) compared to the defined response of plants to radiation (dashed).
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Page 9: Deployment And Installation
Mount the sensor to a solid surface with the nylon mounting screw provided. To accurately measure PPFD incident on a horizontal surface, the sensor must be level. An Apogee Instruments model AL-100 leveling plate is recommended for this purpose. To facilitate mounting on a cross arm, an Apogee Instruments model AM-110 mounting bracket is recommended. -
Page 10: 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 Cable connectors are attached directly to the head. -
Page 11: Operation And Measurement
OPERATION AND MEASUREMENT The S2-442 PAR-FAR sensor has a Modbus output, where PPFD and far-red photon flux density are returned in digital format. Measurement of S2-442 PAR-FAR sensors requires a measurement device with a Modbus interface that supports the Read Holding Registers (0x03) function. - Page 12 Register Index Each register in a sensor represents a value in the sensor, such as a measurement or a configuration parameter. Some registers can only be read, some registers can only be written, and some can be both read and written. Each register exists at a specified index in the table for the sensor.
- Page 13 Read only registers (function code 0x3). Float Registers PAR calibrated output µmol Far-red calibrated output µmol PAR detector millivolts Far-red detector millivolts Ratio Percentage Far-red Reserved for Future Use device status (1 means device is busy, 0 otherwise) firmware version Integer Registers PAR calibrated output µmol (shifted one decimal point to the left) Far-red calibrated µmol (shifted one decimal point to the left)
- 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 Example Packets: An example of a data packet sent from the controller to the sensor using function code 0x3 reading register address 0. Each pair of square brackets indicates one byte. [Slave Address][Function][Starting Address High Byte][Starting Address Low Byte][No of Registers High Byte][No of Registers Low Byte][CRC High Byte][CRC Low Byte] 0x01 0x03 0x00 0x00 0x00 0x02 0xC4 0x0B An example of a data packet sent from the controller to the sensor using function code 0x10 writing a 1 to register...
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Page 16: Maintenance And Recalibration
Never use an abrasive material or cleaner on the diffuser. It is recommended that PAR-FAR 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-... -
Page 17: Troubleshooting And Customer Support
Any datalogger or meter with RS-232/RS-485 that can read/write float or integer values. An example datalogger program for Campbell Scientific dataloggers can be found at https://www.apogeeinstruments.com/content/PAR-Far-Sensor-Modbus.CR1. 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. -
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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