Campbell SN500SS Product Manual
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Campbell SN500SS Product Manual

Net radiometer
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12/2018
Copyright ©
2018
Campbell Scientific, Inc.

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Summary of Contents for Campbell SN500SS

  • Page 1 12/2018 Copyright © 2018 Campbell Scientific, Inc.
  • Page 2 Limited warranty “Products manufactured by CSI are warranted by CSI 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 in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold by CSI, are warranted only to the limits extended by the original manufacturer.
  • Page 3 Assistance Products may not be returned without prior authorization. The following contact information is for US and international customers residing in countries served by Campbell Scientific, Inc. dir- ectly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com...
  • Page 4 Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR...

  • Page 5: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 5. Overview 6. Specifications 7. Installation 7.1 Siting 7.2 Mounting 7.3 Wiring to the data logger 7.4 Programming 7.4.1 SDI-12 programming 8. Operation 8.1 Sensor measurements 8.2 Long cables 9.
  • Page 6 C.2.4 Address query command (?!) C.2.5 Change address command (aAb!) C.2.6 Start measurement commands (aM!) C.2.7 Start concurrent measurement commands (aC!) C.2.8 Start measurement commands with cyclic redundancy check (aMC! and aCC!) C.2.9 Stopping a measurement command C.2.10 Send data command (aD0! … aD9!) C.2.11 Continuous measurement command (aR0! …...

  • Page 7: Introduction

    This sensor features an SDI-12 output, eliminating the need for multiple analog channels 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 8 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 9 4. Click the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after wiring the sensor. 5. Repeat steps three and four for other sensors. SN500SS Net Radiometer...
  • Page 10 9. If the sensor is connected to the data logger, check the output of the sensor in the data log- ger support software data display in LoggerNet, PC400, RTDAQ, or PC200W to make sure it is making reasonable measurements. SN500SS Net Radiometer...

  • Page 11: Overview

    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 mounted in an anodized aluminum housing. Each radiometer is heated to minimize the effects of dew, frost, snow, and ice on the filter and sensor head. Analog signals from each radiometer...

  • Page 12: Specifications

    Complete package that includes net radiometer, mounting rod, cable for data logger inter- face, and carrying case Compatible with Campbell Scientific CRBasic data loggers: CR300 series, CR6, CR200(X) series, CR800 series, CR1000X, CR1000, CR3000, and CR5000 Pyranometer spectral response:...

  • Page 13: Installation

    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 14 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. 8)). If mounted to a vertical pipe, ensure that the pipe does not cast a reflection on the sensor.

  • Page 15: Wiring To The Data Logger

    For the CR6 and CR1000X dataloggers, triggering conflicts may occur when a companion ter- minal 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 16: Programming

    Example program (p. 17). 7.4.1 SDI-12 programming SDI12Recorder() instruction is used to measure an SN500SS. This instruction sends a request to the sensor to make a measurement and then retrieves the measurement from the sensor. See Sensor measurements (p. 11) for more information.

  • Page 17: 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 18: 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.

  • Page 19: Maintenance, Calibration, And Troubleshooting

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

  • Page 20: Troubleshooting

    Campbell Scientific for recalibration (see Assistance (p. ii) page). 9.3 Troubleshooting Symptom: –9999 or NAN readings 1. Check that the sensor is wired to the control or U terminal specified by the SDI12Recorder() instruction.

  • Page 21: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Copy and paste the section beginning with heading “–Wiring for CRXXX–” into the CRBasic program, usually at the head of the file. After pasting, edit the information such that an apostrophe (') begins each line. This SN500SS Net Radiometer...
  • Page 22 You can highlight several lines of CRBasic code then right-click and select Comment Block. (This fea- ture is demonstrated at about 5:10 in the CRBasic | Features video.) SN500SS Net Radiometer...

  • Page 23: Appendix B. Example Program

    (1,BattV,IEEE4,0,False) Sample (1,PanelT,IEEE4) Average (1,Incoming_SW,IEEE4,False) Average (1,Outgoing_SW,IEEE4,False) Average (1,Incoming_LW,IEEE4,False) Average (1,Outgoing_LW,IEEE4,False) EndTable 'Main Program BeginProg 'The scan rate should not be less than 10 s; faster rates cause the 'data table to fail to populate. Scan (10,Sec,0,0) SN500SS Net Radiometer...
  • Page 24 CRBasic Example 1: Battery (BattV) PanelTemp (PanelT,60) 'Measure Surface Temperature SDI12Recorder 'refer to Table 8-1 (Net(),C1,0,"MC!",1.0,0) 'for a list of relevant commands 'Call Output Tables CallTable Net_Rad NextScan EndProg SN500SS Net Radiometer...

  • Page 25: Appendix C. Sdi-12 Sensor Support

    SDI-12, Serial Data Interface at 1200 baud, is a protocol developed to simplify sensor and data log- ger compatibility. Only three wires are necessary — serial data, ground, and 12 V. With unique addresses, multiple SDI-12 sensors can connect to a single SDI-12 terminal on a Campbell Scientific data logger.

  • Page 26: Acknowledge Active Command (A!)

    Table C-1: Campbell Scientific sensor SDI-12 command and response set Name Command Response Start Verification atttn <CR><LF> Address Query a<CR><LF> aAb! Change Address b<CR><LF> Start Measurement atttn<CR><LF> aM1!...aM9! aMC! Start Measurement atttn <CR><LF> aMC1!...aMC9! and Request CRC Start Concurrent Measurement atttnn<CR><LF>...

  • Page 27: 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 28: Start Measurement Commands (Am!)

    To use this command, the scan interval should be 10 seconds or less. The response to each com- mand 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 29 10 seconds later, after a total of 30 seconds have XD0! passed, the data logger starts the process of 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 30: Start Measurement Commands With Cyclic Redundancy Check (Amc! And Acc!)

    A sensor may return up to 35 char- acters of data in response to a D command that follows an M! or MC! command. A sensor may SN500SS Net Radiometer...

  • Page 31: 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 com- munication with probes. Data logger security may need to be unlocked before activating the transparent mode. SN500SS Net Radiometer...

  • Page 32: Changing An Sdi-12 Address

    Transparent mode is entered while the PC is communicating with the data logger through a ter- minal emulator program. It is accessed through Campbell Scientific data logger support software or other terminal emulator programs. Data logger keyboards and displays cannot be used.

  • Page 33: Changing An Sdi-12 Address - Cr200(X) Series

    10. To change the SDI-12 address, type aAb!, where a is the current address from the above step and b is the new address (see FIGURE C-2 (p. 28). Press Enter. The sensor changes its address and responds with the new address. 11. To exit SDI-12 transparent mode, click Close Terminal. SN500SS Net Radiometer...

  • Page 34: References

    FIGURE C-2. CR200(X) example of using the SDI-12 transparent mode to change the SDI- 12 address from 0 to 1 C.4 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.or- g/current_specification/SDI-12_version-1_4-Dec-1-2017.pdf. SN500SS Net Radiometer...
  • Page 35 Campbell Scientific Worldwide Offices Australia Germany Location: Garbutt, QLD Australia Location: Bremen, Germany Email: Email: info@campbellsci.com.au info@campbellsci.de Website: www.campbellsci.com.au Website: www.campbellsci.de Brazil South Africa Location: São Paulo, SP Brazil Location: Stellenbosch, South Africa Email: andread@campbellsci.com.br Email: sales@csafrica.co.za Website: Website: www.campbellsci.com.br www.campbellscientific.co.za...

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