Apogee SN500SS Product Manual
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Apogee SN500SS Product Manual

Net radiometer
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Revision: 08/2021
Copyright © 2018 – 2021
Campbell Scientific, Inc.

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Summary of Contents for Apogee SN500SS

  • Page 1 Revision: 08/2021 Copyright © 2018 – 2021 Campbell Scientific, Inc.

  • Page 2: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 5. Overview 6. Specifications 7. Installation 7.1 Wiring to the data logger 7.2 Programming 7.2.1 CRBasic programming 7.3 Siting 7.4 Mounting 8. Operation 8.1 Sensor measurements 8.2 Long cables 9.
  • Page 3 B.1.7 Start concurrent measurement commands (aC!) B.1.8 Start measurement commands with cyclic redundancy check (aMC! and aCC!) 21 B.1.9 Stopping a measurement command B.1.10 Send data command (aD0! … aD9!) B.1.11 Continuous measurement command (aR0! … aR9!) B.1.12 Extended commands B.2 SDI-12 transparent mode B.2.1 Changing an SDI-12 address B.3 References...

  • Page 4: Introduction

    This sensor features an SDI-12 output, eliminating the need for multiple analog terminals to measure the individual components of net radiation. The SN500SS offers a complete package that includes a net radiometer, mounting rod, pigtail lead cable for data logger interface, and a carrying case.
  • Page 5 1. Open Short Cut and click Create New Program. 2. Double-click the data logger model. 3. In the Available Sensors and Devices box, type SN500SS or locate the sensor in the Sensors > Meteorological > Solar Radiation folder. Double-click SN500SS. Type the correct SDI-12 Address.
  • Page 6 5. Repeat steps three and four for other sensors. 6. In Output Setup, type the scan rate, meaningful table names, and Data Output Storage Interval. NOTE: Because of the delays using SDI-12, Campbell Scientific recommends measurement scans of 10 seconds or more. SN500SS Net Radiometer...

  • Page 7: Overview

    LoggerNet, RTDAQ, or PC400 to make sure it is making reasonable measurements. 5. Overview The SN500SS is a four-component instrument with individual upward- and downward-looking pyranometers and pyrgeometers. Each radiometer consists of a thermopile detector and filter SN500SS Net Radiometer...
  • Page 8 SDI-12 outputs, eliminating the need for multiple analog data logger terminals to make the four-component measurement of net radiation. The SN500SS is small and lightweight to facilitate mounting. Net radiation at Earth surface is the source of available energy that drives key processes, including surface and atmospheric heating, evaporation, sublimation, and transpiration.

  • Page 9: Specifications

    (p. 7). Short Cut does this work for you. See QuickStart (p. 1) for a tutorial. 7.1 Wiring to the data logger Connect the SN500SS to the data logger in the order shown in Table 7-1 (p. 7). SN500SS Net Radiometer...

  • Page 10: Programming

    For the CR6 and CR1000X data loggers, triggering conflicts may occur when a companion terminal is used for a triggering instruction such as TimerInput(), PulseCount(), or WaitDigTrig(). For example, if the SN500SS is connected to C3 on a CR1000X, C4 cannot be used in the TimerInput(), PulseCount(), or WaitDigTrig() instructions.

  • Page 11: Siting

    To avoid shading or reflection effects and to promote spatial averaging, the SN500SS should be mounted at least 1.5 m (5 ft) above the ground or crop surface. Campbell Scientific recommends that the SN500SS be mounted to a separate vertical pipe at least 7.6 m (25 ft) from any other mounting structures.
  • Page 12 FIGURE 7-1. Back of SN500SS shows the mounting rod port (left) and cable connector FIGURE 7-2. Back of SN500SS with the mounting rod and cable connected 2. Attach the mounting bracket to the vertical mounting pipe, or CM200-series crossarm using the provided U-bolt (FIGURE 7-3 (p.
  • Page 13 FIGURE 7-3. Two views of the SN500SS mounted to a horizontal crossarm 3. Insert the sensor support arm into the mounting block of the mounting bracket kit (FIGURE (p. 10)). Make sure the sensor points in the direction of the arrows that appear after the word SENSOR on top of the bracket.

  • Page 14: Operation

    8. Operation 8.1 Sensor measurements (p. 12). When using an M!, The SN500SS responds to the SDI-12 commands shown in Table 8-1 M1!, M2!, M3!, or M4! command, the data logger waits for the time specified by the sensor, sends the D! command, pauses its operation, and waits until either it receives the data from the sensor or the sensor timeout expires.

  • Page 15: Long Cables

    Table 8-1: SN500SS SDI-12 commands SI-12 command Values returned or function Units (a is the sensor address) –2 1. Incoming short-wave (SW) radiation –2 2. Outgoing SW radiation aM!, aC!, –2 3. Incoming long-wave (LW) radiation aMC!, or aCC! 4. Outgoing LW radiation –2...

  • Page 16: Maintenance, Calibration, And Troubleshooting

    If sensor shortwave radiation measurements over multiple days near solar noon are consistently different than calculated values (by more than 6 %), the sensor should be cleaned and re-leveled. If SN500SS Net Radiometer...

  • Page 17: Troubleshooting

    12V terminal (non-switched) for test purposes. SDI12Recorder() 3. Verify the probe SDI-12 address matches the address entered for the instruction. The address can be verified or changed with the commands described in SDI-12 sensor support (p. 16). SN500SS Net Radiometer...

  • Page 18: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which instructs the data logger compiler to ignore those lines when compiling. The Comment Block feature is demonstrated at about 5:10 in the CRBasic | Features video SN500SS Net Radiometer...

  • Page 19: Appendix B. Sdi-12 Sensor Support

    <CR><LF> (carriage return and line feed). Standard SDI-12 commands are listed Table B-1 (p. 16). Table B-1: Campbell Scientific sensor SDI-12 command and response set Response Name Command Acknowledge Active a<CR><LF> allccccccccmmmmmmvvvxxx...xx Send Identification <CR><LF> Start Verification atttn <CR><LF> SN500SS Net Radiometer...

  • Page 20: Acknowledge Active Command (A!)

    Sensor identifiers are requested by issuing command aI!. The reply is defined by the sensor manufacturer but usually includes the sensor address, SDI-12 version, manufacturer’s name, and sensor model information. Serial number or other sensor specific information may also be included. allccccccccmmmmmmvvvxxx...xx<CR><LF> Sensor SDI-12 address SDI-12 version number (indicates compatibility) SN500SS Net Radiometer...

  • Page 21: Start Verification Command (Av!)

    For example, to change an address from 0 to 2, the command is 0A2!. The sensor responds with the new address b, which in this case is 2. NOTE: Only one sensor should be connected to a particular terminal at a time when changing addresses. SN500SS Net Radiometer...

  • Page 22: Start Measurement Commands (Am!)

    To use this command, the scan interval should be 10 seconds or less. The response to each command has the form atttn<CR><LF>, where a = the sensor address ttt = time, in seconds, until the measurement data is available SN500SS Net Radiometer...
  • Page 23 10 seconds later, after a total of 30 seconds have passed, the data logger starts the process of XD0! collecting data from sensor X by issuing the first D command. The sensor immediately responds with the sensor X+1+2+3+4+5<CR><LF> address and the 5 values. SN500SS Net Radiometer...

  • Page 24: Start Measurement Commands With Cyclic Redundancy Check (Amc! And Acc!)

    Depending on the type of data returned and the number of values a sensor returns, the data logger may need to issue aD0! up to aD9! to retrieve all data. A sensor may return up to 35 SN500SS Net Radiometer...

  • Page 25: Continuous Measurement Command (Ar0

    System operators can manually interrogate and enter settings in probes using transparent mode. Transparent mode is useful in troubleshooting SDI-12 systems because it allows direct communication with probes. Data logger security may need to be unlocked before activating the transparent mode. SN500SS Net Radiometer...

  • Page 26: Changing An Sdi-12 Address

    3. Under Select Device, located in the lower left side of the window, select the CR1000X 4. Click Open Terminal. 5. Select All Caps Mode. 6. Press Enter until the data logger responds with the CR1000X> prompt. SN500SS Net Radiometer...
  • Page 27 Press Enter. The sensor changes its address and responds with the new address. In the following example, the sensor address is changed from 0 to B. 11. To exit SDI-12 transparent mode, click Close Terminal. SN500SS Net Radiometer...

  • Page 28: References

    The transparent mode for the CR6, CR3000, CR800-series, CR300-series, and CR1000 data loggers is similar to that shown for the CR1000X. B.3 References SDI-12 Support Group. SDI-12: A Serial-Digital Interface Standard for Microprocessor-Based Sensors – Version 1.4. River Heights, UT: SDI-12 Support Group, 2017. http://www.sdi- 12.org/current_specification/SDI-12_version-1_4-Dec-1-2017.pdf SN500SS Net Radiometer...
  • Page 29 Limited warranty Products manufactured by Campbell Scientific are warranted by Campbell Scientific to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified on the corresponding product webpage. See Product Details on the Ordering Information pages at www.campbellsci.com .
  • Page 30 Assistance Products may not be returned without prior authorization. Products shipped to Campbell Scientific require a Returned Materials Authorization (RMA) or Repair Reference number and must be clean and uncontaminated by harmful substances, such as hazardous materials, chemicals, insects, and pests. Please complete the required forms prior to shipping equipment.
  • Page 31 Safety DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE.
  • Page 32 Campbell Scientific Regional Offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil Location: Bremen, Germany Location:...

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