Campbell SR20-T2 Product Manual
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Campbell SR20-T2 Product Manual

Iso secondary standard pyranometer
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Revision: 05/2020
Copyright © 2018 – 2020
Campbell Scientific, Inc.

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Summary of Contents for Campbell SR20-T2

  • Page 1 Revision: 05/2020 Copyright © 2018 – 2020 Campbell Scientific, Inc.

  • Page 2: Table Of Contents

    1. Introduction 2. QuickStart 3. Siting 4. Mounting procedure 5. Wiring 6. Analog programming 7. Integrated thermistor 8. Maintenance and troubleshooting Appendix A. Importing Short Cut code into CRBasic Editor Appendix B. SR20-T2 example programs Table of Contents - i...

  • Page 3: Introduction

    1. Introduction The SR20-T2, manufactured by Hukseflux Thermal Sensors, is an ISO 9060 spectrally flat Class A (secondary standard) pyranometer that measures solar short-wave radiation in a full hemisphere of the sky. It has a built-in case temperature sensor and embedded heater for removing dew and light rain.
  • Page 4 3. In the Available Sensors and Devices box, type SR20 or locate the sensor in the Sensors > Meteorological > Solar Radiation folder. Double-click the SR20-T2 ISO Secondary Standard Pyranometer. Type the Sensitivity and temperature coefficient values listed on the calibration sheet.
  • Page 5 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. 6. In Output Setup, type the scan rate, meaningful table names, and Data Output Storage Interval. SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 6: Siting

    The sensor should be mounted with the cable pointing towards the nearest magnetic pole. For example, in the northern hemisphere, point the cable toward the North Pole. SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 7: Mounting Procedure

    4. Secure the mounting bracket to the crossarm or vertical pole using the hardware included with the mounting bracket. The CM255 uses one U-bolt, nuts, flat washers, and lock washers to mount the bracket, as shown in the following figure. SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...
  • Page 8 5. For pyranometers mounted horizontally, ensure the mounting bracket is horizontal in two dimensions. For pyranometers mounted at an angle, set the mounting bracket angle to the desired angle prior to tightening the mounting hardware. SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 9: Wiring

    U configured for single- ended analog input , SE ended analog input , SE Thermistor signal (single-ended, analog- (single-ended, analog- voltage input) voltage input) Thermistor Blue ⏚ (analog ground) ⏚ (analog ground) reference SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...
  • Page 10 SW, SW12, SW12V, SW SW, SW12, SW12V, SW Heater (polarity Battery (switched 12 V) Battery (switched 12 V) Brown does not matter, 1.5 W at 12 VDC) Constant heater power: Constant heater power: SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...
  • Page 11 , EX, VX (voltage excitation) (voltage excitation) Black Ground Clear Shield ⏚ (analog ground) ⏚ (analog ground) U channels are automatically configured by the measurement instruction. Jumper to ground with a user-supplied wire. SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...
  • Page 12 FIGURE 5-1. Schematic of the integrated thermistor (2-wire configuration) FIGURE 5-2. Schematic of the integrated thermistor (4-wire configuration) SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 13: Analog Programming

    M × t / 3600 Totalize –2 M = 1000/c, where c is the sensor output in μV / W × m t = data logger program execution interval in seconds SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 14: Integrated Thermistor

    8. Maintenance and troubleshooting The SR20-T2 has no service items requiring scheduled replacement. There is no accessible desiccant cartridge to maintain. Use pure alcohol or distilled water and a lint-free cloth to clean the dome, removing smears and deposits. Local conditions and application dictate cleaning interval.
  • Page 15 50 or 60 Hz integration option in the data logger program if electromagnetic radiation can be a problem. Check the cable for damage and ensure that it is properly connected to the data logger. SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 16: 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 SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...

  • Page 17: Appendix B. Sr20-T2 Example Programs

    Clear ⏚ (analog ground) ⏚ (analog ground) Jumper to ground with a user-supplied wire. CRBasic Example 1: CR1000X 2-wire configuration for measuring the SR20-T2 'CR1000X Series Data Logger 'Hukseflux SR20-T2 Pyranometer 'SR20 is a ISO 9060 Secondary Standard pyranometer 'T2 uses a 10k Ohm thermistor...
  • Page 18 CRBasic Example 1: CR1000X 2-wire configuration for measuring the SR20-T2 Const 'uV/W*m^-2 @ 20 DegC SR20T2_SENS_So = 16.12 Const 'Deg C^-2 SR20_A = -7.3905E-6 Const SR20_B = -0.3711E-4 'Deg C^-1 Const SR20_C = 1.0037 'Resistor built into CSI cable (RES 0.1% 10K 1/8W 5PPM)
  • Page 19 CRBasic Example 1: CR1000X 2-wire configuration for measuring the SR20-T2 SR20T2_IRR_TC = SR20T2_mV * (1000/SR20T2_SENS_TC) 'SW12V HEATER CONTROL FUNCTION If TimeIsBetween (0,7,24, hr) Then SW12 (SW12_1,1,0) Else SW12 (SW12_1,0,0) EndIf CallTable (OneMin) CallTable (SR20_T2_MetaData) NextScan EndProg CRBasic Example 2: CR1000X 4-wire configuration for measuring the SR20-T2...
  • Page 20 CRBasic Example 2: CR1000X 4-wire configuration for measuring the SR20-T2 'Thermistor Constants for Steinhart-Hart Linearization 'Constants for YSI 44031 type 10K thermistor Const A = 1.0295*10^-3 Const B = 2.391*10^-4 Const C = 1.568*10^-7 Units SR20T2_IRR = W/m^2 Units SR20T2_IRR_TC = W/m^2...
  • Page 21 CRBasic Example 2: CR1000X 4-wire configuration for measuring the SR20-T2 SW12 (SW12_1,0,0) EndIf CallTable (OneMin) CallTable (SR20_T2_MetaData) NextScan EndProg SR20-T2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer...
  • Page 22 See Product Details on the Ordering Information pages at www.campbellsci.com. Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer.
  • Page 23 Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees.
  • Page 24 Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose contents to water. Dispose of spent batteries properly. 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 25 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...

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