LI-COR LI-200R Instruction Manual
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LI-COR LI-200R Instruction Manual

Pyranometer
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LI-200R
Pyranometer
Instruction Manual

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  • Page 1 LI-200R Pyranometer Instruction Manual...
  • Page 3 LI-200R Pyranometer Instruction Manual Publication Number 984-15210 LI-COR®, Inc. 4647 Superior Street Lincoln, Nebraska 68504 USA Telephone: (402) 467-3576 FAX: 402-467-2819 Toll Free: 1-800-447-3576 (U.S. & Canada) envsales@licor.com www.licor.com/env/support/ www.licor.com...
  • Page 4 NOTICE The information contained in this document is subject to change without notice. LI-COR® MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. LI-COR shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
  • Page 5 Printing History Publication Number: 984-15210 New editions of this manual will include all updates. An update addendum may be used between editions to provide up-to-date information. Revisions are indicated by the revision number. Minor updates, which do not alter the meaning of the content, will be incorporated without affecting the revision number.
  • Page 6 LI-200R-BL-x; LI-200R-BNC-x (x = 2, 5, 15, 50) Hazardous Substances or Elements Chromium VI Polybrominated Polybrominated Compounds Biphenyls Diphenyl Ethers Component Name Lead (Pb) Mercury (Hg) Cadmium (Cd) (PBB) (PBDE) Pyranometer Sensor Head Assembly Base and Cable Assembly O: this component does not contain this hazardous substance above the maximum concentration values in homogeneous materials specified in the SJ/T 11363-2006 Industry Standard.
  • Page 7 2420-BL Hazardous Substances or Elements Chromium VI Polybrominated Polybrominated Compounds Biphenyls Diphenyl Ethers Component Name Lead (Pb) Mercury (Hg) Cadmium (Cd) (PBB) (PBDE) Amplifier Bare Lead Assembly O: this component does not contain this hazardous substance above the maximum concentration values in homogeneous materials specified in the SJ/T 11363-2006 Industry Standard.

  • Page 9: Table Of Contents

    Table of Contents Section 1. General Information Comparing LI-COR® Radiation Sensors Cable Options Accessories Configurations Section 2. Using the LI-200R Pyranometer Mounting Calibration Constants and Multipliers Using the LI-200R-BNC Pyranometer Using the LI-200R-BL Pyranometer Voltage Signal Options Section 3. Millivolt Adapters...
  • Page 10 Cosine Response LI-200R Cosine Correction Spectral Response Calibration Section 6. Care and Maintenance Factory Recalibration Removing a Cable Sensor Base Cover Installing a Cable Replacement Parts Section 7. Troubleshooting Appendix A. Specifications LI-200R Pyranometer Specifications Appendix B. Warranty Appendix C. Index...

  • Page 11: Section 1. General Information

    Measurements under vegetation, cloud cover, artificial lights, in a greenhouse, or of reflected solar radiation may not be accurate. The spectral response of the LI-200R does not include the entire solar spectrum (Figure 5-3). Therefore, it must be used under lighting conditions that are the same as those under which it was calibrated.

  • Page 12: Cable Options

    The detachable base and cable assembly provides benefits including: • Reduced cost of cable repairs • The ability to replace or recalibrate a light sensor without removing the cable from the mounting structure • Cable interchangeability with any LI-190R, LI-200R, or LI-210R sensor head...

  • Page 13: Accessories

    Any base and cable assembly can be used interchangeably with any LI-190R, LI-200R, or LI-210R sensor head. Accessories These optional accessories are available for use with the LI-200R Pyranometer: • 2220 Millivolt Adapter, 147 Ω resistance (see page 3-1) •...

  • Page 14: Configurations

    Section 1. General Information Configurations The LI-200R Pyranometer connects directly to devices that read a current (µA) sensor signal (Table 1-2). Table 1-3 lists pyranometer configurations for producing a voltage signal. Table 1-2. Configurations for a current (µA) signal. Ultimate termination is BNC or bare leads.

  • Page 15: Section 2. Using The Li-200R Pyranometer

    The 2003S Mounting and Leveling Fixture can be secured to a structure with bolts or screws placed through the three holes in the fixture. Figure 2-1. LI-200R Pyranometer mounted in the 2003S Mounting and Leveling Fixture.

  • Page 16: Calibration Constants And Multipliers

    ) by applying this multiplier, expressed in radiation units per current (W m µA ). This multiplier is a negative number. 3. Multiplier for use with LI-200R-BL (3-wire bare leads). This multiplier is expressed in radiation units per current (W m µA ) and is a positive number.

  • Page 17: Using The Li-200R-Bnc Pyranometer

    W m Using the LI-200R-BL Pyranometer Figure 2-3. LI-200R-BL Pyranometer featuring 3-wire bare leads. A BL-type sensor cable terminates with bare wire leads. Connect the bare leads to the input terminal block of a device that directly measures a current (μA) signal.

  • Page 18: Voltage Signal Options

    To log radiation units (W m ), configure the recording device to multiply the μA signal by the sensor's multiplier (see "Multiplier for use with the LI-200R- BL" on page 2-2) prior to logging the values. If logging the μA sensor signal, apply the multiplier after logging.

  • Page 19: Section 3. Millivolt Adapters

    Millivolt Adapters LI-COR radiation sensors produce a current (μA) output signal that can be converted to a voltage through the use of a resistor. LI-COR makes two types of millivolt adapters for use with our BNC-type radiation sensors. Each adapater includes a precision resistor and a BNC connector that mates with the sensor.

  • Page 20: Connecting The 2220 Millivolt Adapter

    Section 3. Millivolt Adapters An LI-200R Pyranometer with a BNC-type cable can be used with a millivolt recorder or data logger by connecting a model 2220 Millivolt Adapter. Convert the voltage measured by the data logger into radiation units (W m...

  • Page 21: Li-200R-Smv Pyranometer

    2220 Millivolt Adapter) is that sensors can be exchanged in the field without the need to enter a unique multiplier in the data logger or recorder. An LI-200R Pyranometer with a BNC-type connector can be converted to an LI- 200R-SMV by attaching a Standard Output Millivolt Adapter (part number 2320) to the BNC connector.
  • Page 22 Section 3. Millivolt Adapters If bipolar signal capability is not available, connect the positive (red) lead to the signal input, and the negative (black) lead to the common terminal. In this case, use the absolute value of the multiplier.

  • Page 23: 2420 Amplifier Gain Settings

    The 2420 Light Sensor Amplifier converts the current (μA) signal from the radiation sensor into a voltage that can be measured by most data loggers and system controllers. The 2420 Amplifier works with both old and new LI-COR radiation sensor designs. Two amplifier models are available:...
  • Page 24 Section 4. 2420 Light Sensor Amplifier section shows how to determine the correct gain settings and multiplier. Gather the following information: • Calibration constant for your light sensor (C) • Maximum full-scale radiation intensity to be measured (I • Full-scale input voltage of the datalogger (V Follow these steps to calculate the amplifier gain setting and voltage multiplier: 1.
  • Page 25 Section 4. 2420 Light Sensor Amplifier Table 4-1. Gain settings table for the 2420 Amplifier 2420 Gain Settings Table DIP Switch Gain (V μA DIP Switch Gain (V μA G = 0.375 G = 0.175 (all switches off) G = 0.350 G = 0.150 G = 0.325 G = 0.125...

  • Page 26: Connecting To A Data Logger

    Section 4. 2420 Light Sensor Amplifier 6. Calculate the voltage multiplier (M). The voltage multiplier is used to convert –2 the voltage measured by the data logger into units of radiation (W m ). The –2 –1 units for M are W m ⋅...
  • Page 27 Section 4. 2420 Light Sensor Amplifier Data logger Wiring, Differential Data logger Wiring, Single-ended Important Note! In the single-ended configuration, use the following steps to check for ground loops. This procedure only applies when the 2420 is in the single-ended configuration. 1.

  • Page 28: Connecting To A Sensor

    Note: The 2420 Amplifier requires a current (μA) signal from the sensor. It will not work with a millivolt adapter or with a sensor that produces a voltage signal output. LI-COR radiation sensors come wired with bare leads or a BNC connector. 2420-BNC Light Sensor Amplifier: connects to a BNC type light sensor.

  • Page 29: Equation Summary

    Section 4. 2420 Light Sensor Amplifier Equation Summary Output Voltage The 2420 Light Sensor Amplifier output voltage is computed as: ⋅ Variable Units Description Amplifier output voltage V μA Amplifier gain setting μA Light sensor photocurrent signal Ideal Gain The ideal gain (G ) is the gain needed by the 2420 Amplifier to adjust the full- ideal scale sensor output to the full-scale input voltage of the data logger.

  • Page 30: 2420 Amplifier Performance Characteristics

    Section 4. 2420 Light Sensor Amplifier 2420 Amplifier Performance Characteristics Output The 2420 Amplifier generates an output signal up to 5.0 V and down to -2.5 V over the entire input supply voltage range (+ 3.8 to 28 VDC). The output is linear with the current signal provided by the light sensor with an offset of ±...

  • Page 31: Section 5. Performance Characteristics

    The LI-200R is fully cosine-corrected, with sensitivity to light nearly equal at all angles of incidence to about 82° angle of incidence (Figure 5-1). Errors are typically less than ±...
  • Page 32 Section 5. Performance Characteristics Angle of Incidence (Degrees) Figure 5-1. Typical cosine response of the LI-200R Pyranometer. Figure 5-2. LI-COR sensor creating the proper cosine response at various angles of incidence.

  • Page 33: Spectral Response

    Spectral Response The spectral response of the LI-200R is not equal to the ideal (equal sensitivity from 280 to 2800 nm), but the instrument provides a good measurement of solar radiation when it is used to measure unobstructed daylight.
  • Page 34 2500 3000 Wavelength (nm) Figure 5-3. Spectral response of the LI-200R Pyranometer along with the energy distribution in the solar spectrum The area under the spectral irradiance curve of the source is directly proportional to the energy received by a horizontal surface. Under typical conditions, energy received on a completely overcast day has been estimated to be near 11% of that received on a clear day.

  • Page 35: Calibration

    Section 5. Performance Characteristics Calibration Each LI-COR radiation sensor is fully calibrated at the factory, and no user calibration is needed. Acquire the calibration for your sensor by entering the serial number at www.licor.com/env/support/. The recommended recalibration interval is every 2 years. Return your sensor to LI-COR for recalibration (see "Factory Recalibration"...

  • Page 37: Section 6. Care And Maintenance

    Figure 6-1. LI-200R Pyranometer The vertical edge of the acrylic diffuser (see Figure 6-1) must be clean to maintain calibration and correct cosine response. Use warm water and a soft, lint-free towel or cotton-tipped swab to remove dust and other soluble deposits.

  • Page 38: Factory Recalibration

    You can acquire the certificate of calibration for your sensor by entering the sensor serial number at www.licor.com/env/support/. Return your sensor to LI-COR for recalibration. If possible, replace the protective cap that came with the sensor. Ship the sensor head attached to the base and cable assembly when possible.

  • Page 39: Sensor Base Cover

    2001S Sensor Base Cover, available from LI-COR. Attach using the same screws that held the sensor head to the base. Figure 6-3. Sensor Base Cover installed on the sensor base in place of the sensor head.

  • Page 40: Replacement Parts

    LI-190R, LI-200R, or LI-210R sensor head. • Flat head Phillips machine screw, 2-56 threads, 1/2" long, 82° countersink, stainless steel (for securing the sensor base to the sensor head), LI-COR part number 122-12774. Three screws are required for each sensor. •...

  • Page 41: Section 7. Troubleshooting

    Troubleshooting Sensor readings have a negative (-) sign: • Check for proper wiring of the LI-200R-BL (see page 2-3), 2220 Millivolt Adapter (see page 3-2), or LI-200R-SMV Pyranometer (see page 3-3). • Make sure the proper sign was used on the multiplier entered into the LI- 1500, LI-1400, or LI-250A, or other recording device (see "Calibration...

  • Page 43: Appendix A. Specifications

    Appendix A. Specifications LI-200R Pyranometer Specifications Absolute Calibration: Calibrated against an Eppley Precision Spectral Pyranometer (PSP) under natural daylight conditions. Absolute uncertainty under these conditions is ± 3% typical; ± 5% maximum Sensitivity: Typically 75 μA per 1000 W m Linearity: Maximum deviation of 1% up to 3000 W m Response Time: Less than 1 μs (2 m cable terminated into a 147 Ω...

  • Page 45: Appendix B. Warranty

    Appendix B. Warranty Each LI-COR, Inc. instrument is warranted by LI-COR, Inc. to be free from defects in material and workmanship; however, LI-COR, Inc.'s sole obligation under this warranty shall be to repair or replace any part of the instrument which LI-COR, Inc.'s examination discloses to have been defective in material...
  • Page 46 The foregoing constitutes LI-COR, Inc.'s sole obligation and liability with respect to damages resulting from the use or performance of the instrument and in no event shall LI-COR, Inc. or its representatives be liable for damages beyond the price paid for the instrument, or for direct, incidental or consequential damages.

  • Page 47: Appendix C. Index

    Appendix C. Index factory 5-5 multipliers 2-2, 2-4 2001S Sensor Base Cover 6-3 Certificate of Calibration 2-2 2003S Mounting and Leveling Fixture 2-1 Cleaning 6-1 2220 Millivolt Adapter 3-2 Comparing Sensors 1-1 2320 Standard Output Millivolt Configurations Adapter 3-3 for a current signal 1-4 2420 Light Sensor Amplifier 4-1 for a voltage signal 1-4 performance characteristics 4-8...
  • Page 48 Mounting and Levelling Fixture 2-1 Mounting Sensors 2-1 Multipliers 2-3 for handheld meters 2-2 for the 2220 Millivolt Adapter 2-2 for the LI-200R-SMV 2-2, 3-3 with 3-wire bare leads 2-2 Photometric Sensor 1-1 Power Supply for the 2420 Amplifier 4-4 Pyranometer 1-1...
  • Page 50 Germany Phone: +49 (0) 6172 17 17 771 Fax: +49 (0) 6172 17 17 799 envsales-gmbh@licor.com • envsupport-gmbh@licor.com LI-COR Ltd., United Kingdom Serving Denmark, Finland, Ireland, Norway, Sweden, and UK. LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road...

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