Apogee Instruments S2-442 Owner's Manual
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Apogee Instruments S2-442 Owner's Manual

Par-far sensor
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OWNER'S MANUAL

PAR-FAR SENSOR
Models S2-442
Rev: 31-Aug-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.

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Summary of Contents for Apogee Instruments S2-442

  • Page 1: Owner's Manual

    OWNER’S MANUAL PAR-FAR SENSOR Models S2-442 Rev: 31-Aug-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 ..............................11 Maintenance and Recalibration ............................. 16 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

    (does not have to be horizontal), where the radiation emanates from all angles of a hemisphere. The S2-442 model outputs a digital signal using Modbus RTU communication protocol over RS-232 or RS-485.

  • Page 6: 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 7: Specifications

    LEDs (735 nm peak, 710-760 nm range). The transfer standard far red sensors are calibrated against a spectroradiometer (Apogee Instruments model PS-300) under the same far red LEDs. The spectroradiometer is calibrated with a quartz halogen lamp...
  • Page 8 Cosine Response 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. Mean directional (cosine) response of seven apogee PAR-FAR sensors.
  • Page 9 Spectral Response Spectral response of PAR detector (blue) and Far Red detector (red) compared to the defined response of plants to radiation (dashed).

  • Page 10: 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 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 Cable connectors are attached directly to the head.

  • Page 12: 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 13 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 14 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 15 *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 16 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...

  • Page 17: Maintenance And Recalibration

    3. Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water. Apogee Instruments PAR-FAR 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 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 drain. It should be near 37 mA when the sensor is powered. Any current drain significantly greater than approximately 37 mA indicates a problem with power supply to the sensors, wiring of the sensor, or sensor electronics.

  • 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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