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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Summary of Contents for LI-COR LI-200R

  • Page 1 LI-200R Pyranometer Instruction Manual...
  • Page 3 LI-COR GmbH, Germany Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com envsupport-eu@licor.com LI-COR Ltd., United Kingdom St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com envsupport-eu@licor.com...
  • Page 4 Waste Framework Directive SCIP database. You can search by product name (for this product “LI-200R”), or request an “SCIP number” from the email above. LI-COR scientific products are for professional use (non-consumer products). These products do not fall within the vol- untary scopes of regulations: UNI EN ISO 14024, TCO Certified, EPEAT 2018, Blue Angel, TÜV Green Product Mark,...
  • Page 5 LI-200R-SMV-x (x = 2, 5, 15, 50) Hazardous Substances or Elements Chromium VI Polybrominated Polybrominated LI-200R-BL-x; LI-200R-BNC-x (x = 2, 5, 15, 50) Compounds Biphenyls Diphenyl Ethers Hazardous Substances or Elements Lead (Pb) Mercury (Hg) Cadmium (Cd) (PBB) (PBDE) Component Name...

  • Page 7: Table Of Contents

    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 2220 Millivolt Adapter LI-200R-SMV Pyranometer Section 4.
  • Page 8 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 Standard Terms and Conditions Index...

  • Page 9: Section 1. General Information

    The spectral response of the LI-200R does not include the entire solar spectrum (Figure 5-3 on page 5-4). Therefore, it must be used under lighting conditions that are the same as those under which it was calibrated.

  • Page 10: Comparing Li-Cor Radiation Sensors

    (Table 1-1 below). LI-192SA and LI-193SA sensors are submersible, but they can also be used in the atmosphere. The LI-191R Line Quantum Sensor is often used within plant canopies. LI-190R, LI-200R, and LI-210R sensors consist of a sensor head attached to a removable base and cable assembly.

  • Page 11: Cable Options

    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 Figure 1-2. Sensor base and cable assembly detached from the sensor head. The shielded cable leading from the sensor base terminates with either bare wire leads or a weather-resistant, nickel-plated brass BNC connector (Figure 1-3 below).

  • Page 12: Accessories

    2001S Sensor Base Cover. Anodized aluminum Configurations The LI-200R Pyranometer connects directly to devices that read a current (µA) sensor signal (Table 1-2 below). Table 1-3 below lists pyranometer configurations for producing a voltage signal.

  • Page 13: Section 2. Using The Li-200R Pyranometer

    Using the LI-200R Pyranometer Mounting The LI-200R Pyranometer may be hand-held or mounted to an instrument platform. For best results, install your sensor in the 2003S Mounting and Leveling Fixture. Secure the sensor in the fixture by tightening the mounting screws against the sensor base.

  • Page 14: Calibration Constants And Multipliers

    Section 2. Using the LI-200R Pyranometer Calibration Constants and Multipliers Each LI-COR radiation sensor is shipped with a certificate of calibration. The cer- tificate is also available at www.licor.com/env/support/. Enter the sensor's serial num- ber in the calibration search box. The calibration constant and multipliers are listed...

  • Page 15: Using The Li-200R-Bnc Pyranometer

    Figure 2-2. LI-200R-BNC Pyranometer. 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. The blue wire carries a positive signal and the brown wire is negative.

  • Page 16: Voltage Signal Options

    If logging the μA sensor signal, apply the multiplier after logging. The LI-200R-BL can be used with recording devices that require a voltage (mV) sig- nal by adding a precision resistor (see Voltage Signal Options below).

  • Page 17: Section 3. Millivolt Adapters

    LI-COR radiation sensors produce a current (μA) output signal that can be con- verted to a voltage through the use of a resistor. LI-COR makes two types of mil- livolt adapters for use with our BNC-type radiation sensors. Each adapter includes a precision resistor and a BNC connector that mates with the sensor.
  • Page 18 Section 3. Millivolt Adapters sensor's certificate of calibration (see Multiplier for use with LI-COR 2220 (147 Ω) Milllivolt Adapter on page 2-2). The multiplier M for use with a millivolt adapter can also be found by: The 2220 Millivolt Adapter includes a precision resistor with a fixed resistance of 147 Ω, tolerance of ±...

  • Page 19: Li-200R-Smv Pyranometer

    Figure 3-1. LI-200R-SMV Pyranometer. The advantage of using an LI-200R-SMV (compared to an LI-200R-BNC with a 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.
  • Page 20 Section 3. Millivolt Adapters If bipolar signal capability is not available, connect the positive (red) lead to the sig- nal input, and the negative (black) lead to the common terminal. In this case, use the absolute value of the multiplier. LI-200R Pyranometer...
  • Page 21 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 con- trollers. The 2420 Amplifier works with both old and new LI-COR radiation sensor designs. Two amplifier models are available:...

  • Page 22: Section 4. 2420 Light Sensor Amplifier

    Using a small screwdriver, set the four switches in the center of the circuit board based on the amplifier gain determined in step 2. Example: The amplifier gain determined in step 2 (G = 0.050 V μA ) requires all switches to be in the off position: G = 0.050 LI-200R Pyranometer...
  • Page 23 Section 4. 2420 Light Sensor Amplifier Table 4-1. Gain settings table for the 2420 Amplifier. 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 G = 0.300...

  • Page 24: Connecting To A Data Logger

    The differential configuration can give better noise rejection and lower offset voltages. Note: Avoid extending the output wire length. The amplifier and data logger should be kept close together to avoid excess voltage drop and the introduction of noise. LI-200R Pyranometer...

  • Page 25: Differential Wiring

    Section 4. 2420 Light Sensor Amplifier Differential Wiring Single-ended Wiring 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. Disconnect the light sensor from the amplifier. Using a multiplier of 1 and an offset of 0 in the datalogger program, monitor the "dark off- set"...

  • Page 26: Connecting To A Sensor

    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. Attach the BNC connector to the BNC input port on the Amplifier.

  • Page 27: 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 28: 2420 Amplifier Performance Characteristics

    10 kΩ, satisfying the output loading requirements of the 2420. Loading the output with a resistance less than 10 kΩ may cause erroneous readings. Full specifications for the 2420 Amplifier are given in 2420 Light Sensor Amplifier Spe- cifications on page A-2. LI-200R Pyranometer...

  • Page 29: 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 on the next page).
  • Page 30 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. LI-200R Pyranometer...

  • Page 31: 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 radi- ation when it is used to measure unobstructed daylight.
  • Page 32 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 33: Calibration

    The spectral response of the LI-200R does not include the entire solar spectrum (Figure 5-3 on the pre- vious page). Therefore, it must be used under lighting conditions that are the same as those under which it was calibrated.
  • Page 34 Section 5. Performance Characteristics LI-200R Pyranometer...

  • Page 35: Section 6. Care And Maintenance

    If needed, use a Figure 6-1. LI-200R Pyranometer. mild detergent to clean the sensor. Use a solution of vinegar and water for stub- born hard water deposits or salt buildup.

  • Page 36: Factory Recalibration

    Factory Recalibration Each sensor is fully calibrated at the factory. The recommended recalibration inter- val is every 2 years. Contact LI-COR to get a Return Materials Authorization (RMA) form before you return your sensor for recalibration. If possible, replace the pro- tective cap that came with the sensor.

  • Page 37: Sensor Base Cover

    Section 6. Care and Maintenance Any cable can be used with any sensor head without altering the calibration. Cables are interchangeable between the LI-190R, LI-200R, and LI-210R sensors. Sensor Base Cover When a sensor base must be left behind while the head is being factory recal-...

  • Page 38: Replacement Parts

    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. O-ring AS-014 Viton75 (for the sensor base), LI-COR part number 192-14878. LI-200R Pyranometer...

  • Page 39: Section 7. Troubleshooting

    Troubleshooting Sensor readings are negative (-) or zero: Check for proper wiring of the LI-200R-BL (see Multiplier for use with LI-200R-BL (3-wire bare leads) on page 2-2), 2220 Millivolt Adapter (Connecting the 2220 Mil- livolt Adapter on page 3-2), or LI-200R-SMV Pyranometer (LI-200R-SMV Pyrano- meter on page 3-3).
  • Page 40 Section 7. Troubleshooting LI-200R Pyranometer...

  • Page 41: Appendix A. Specifications

    O-ring seal on the sensor base Size: 2.36 cm Diameter x 3.63 cm (0.93" x 1.43") Weight: 24 g head; 60 g base and cable (2 m) with screws Cable Length: 2 m, 5 m, 15 m, 50 m (6.5', 16.4', 49.2', 164') LI-200R Pyranometer...
  • Page 42 Amplifier Gain Accuracy: ± 0.1% typical (± 0.15% max) of gain setting Amplifier Output Noise: 0.5 μV rms (0.375 V μA Gain, 0.1 to 10 Hz Bandwidth) Amplifier Output Loading: ≥ 10 kΩ Response Time: 10 Hz Cable Length: 0.9 m 2420 BL Dimensions LI-200R Pyranometer...
  • Page 43 Appendix A. Specifications 2420 BNC Dimensions 2003S Mounting and Leveling Fixture Dimensions 3x Leveling Screws 1.75” 0.19” Mounting Holes 3.0” Bubble Level 60° 0.25” (0.63 cm) Slot for 0.50” (1.27 cm) Sensor Cable 120° Appendix A. Specifications...
  • Page 44 Appendix A. Specifications LI-200R Pyranometer...

  • Page 45: Standard Terms And Conditions

    Buyer has no right of set-off against other purchase orders or other transactions with LI-COR. Buyer hereby grants LI-COR a security interest in the Products in the amount of the unpaid balance of the purchase price until paid in full. LI- COR may file a financing statement for such security interest and Buyer shall sign any such statements or other documentation necessary to per- fect LI-COR security interest.
  • Page 46 INCOTERMS 2000 designated by LI-COR. LI-COR title to the Products and the risk of loss of or damage to the Products ordered by the Buyer will pass to Buyer at time of LI-COR delivery of Products to the carrier. The carrier shall be deemed Buyer’s agent, and any claims for damages in shipment must be filed with the carrier.
  • Page 47 LI-COR. LI-COR may assign or transfer these Conditions to any successor by way of mer- ger, acquisition or sale of all or substantially all of the assets relating to these Conditions. LI-COR or any successor may assign all or part of the right to payments under these Conditions.
  • Page 48 LI-COR suppliers or subcontractors, transportation difficulties, customs clearance, shortage of energy, raw materials or equipment, or Buyer’s fault or negligence. In the event of any such delay the date of delivery shall, at the request of LI-COR, be deferred for a period equal to the time lost by reason of the delay.

  • Page 49: Index

    Index calibration certificate, 2-2 2001S Sensor Base Cover, 6-3 constants, 2-2 2003S Mounting and Leveling Fixture, 2-1 factory, 5-5 2220 Millivolt Adapter, 3-1 multipliers, 2-2, 2-4 2320 Standard Output Millivolt Adapter, certificate of calibration, 2-2 cleaning, 6-1 2420 Light Sensor Amplifier, 4-1 comparing sensors, 1-2 performance characteristics, 4-8 configurations...
  • Page 50 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, 1-2 power supply for the 2420 Amplifier, 4-4 pyranometer, 1-2...
  • Page 52 LI-COR GmbH, Germany Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com envsupport-eu@licor.com LI-COR Ltd., United Kingdom St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com envsupport-eu@licor.com...

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