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LI-COR LI-190R Instruction Manual

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LI-190R Quantum Sensor
LI-191R Line Quantum Sensor

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Summary of Contents for LI-COR LI-190R

  • Page 1 Terrestrial Quantum Sensors Instruction Manual LI-190R Quantum Sensor LI-191R Line Quantum Sensor...
  • Page 3 Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/env/distributors...
  • Page 4 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 LI-190R-SMV-x (x = 2, 5, 15, 50) LI-190R-BL-x; LI-190R-BNC-x (x = 2, 5, 15, 50) Hazardous Substances or Elements Hazardous Substances or Elements Chromium VI Polybrominated Polybrominated Chromium VI Polybrominated Polybrominated Compounds Biphenyls Diphenyl Ethers Compounds Biphenyls Diphenyl Ethers Component Name...

  • Page 7: Table Of Contents

    Contents Section 1. General Information Comparing LI-COR® Radiation Sensors Cable Options for the LI-190R Cable Options for the LI-191R Accessories Configurations Section 2. Using LI-COR Quantum Sensors Mounting the LI-190R Quantum Sensor Mounting the LI-191R Line Quantum Sensor Calibration Constants and Multipliers...
  • Page 8 Section 5. Performance Characteristics LI-190R Cosine Response LI-191R Cosine Response Quantum Spectral Response Calibration LI-190R Quantum Sensor Calibration LI-191R Line Quantum Sensor Calibration Section 6. Care and Maintenance Factory Recalibration Removing a Cable Sensor Base Cover Installing a Cable Replacement Parts...

  • Page 9: Section 1. General Information

    PAR. A multiplier is used to convert the current signal into units of radi- ation (µmol s Typical applications for the LI-190R include agriculture, greenhouses, growth chambers, controlled laboratory conditions, and environmental research. The LI-191R Line Quantum Sensor is designed to measure PAR in applications where the radiation to be measured is spatially non-uniform, such as within plant canopies.

  • 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 For The Li-190R

    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).

  • Page 12: Cable Options For The Li-191R

    The cable for the LI-191R is available in 2-meter or 5-meter lengths. Accessories Accessories for use with the LI-190R and LI-191R: 2290 Millivolt Adapter. 604 Ω resistance (2290 Millivolt Adapter on page 3-1) 2420 Light Sensor Amplifier (2420 Light Sensor Amplifier on page 4-1) Additional accessories for use with the LI-190R: 2003S Mounting and Leveling Fixture.

  • Page 13: Configurations

    Section 1. General Information Configurations LI-COR Quantum Sensors connect directly to devices that read a current (µA) sensor signal (Table 1-2 below). Table 1-3 below lists configurations for producing a voltage signal. Table 1-2. Configurations for a current (µA) signal. Ultimate termination is BNC or bare leads.
  • Page 14 Section 1. General Information LI-190R and LI-191R Quantum Sensors...

  • Page 15: Section 2. Using Li-Cor Quantum Sensors

    Using LI-COR Quantum Sensors Mounting the LI-190R Quantum Sensor The LI-190R Quantum Sensor may be hand-held or mounted to an instrument plat- form. For best results, install your sensor in the 2003S Mounting and Leveling Fix- ture. Secure the sensor in the fixture by tightening the mounting screws against the sensor base.

  • Page 16: Mounting The Li-191R Line Quantum Sensor

    Quick measurements can be made within a crop canopy by supporting the sensor with one hand and extending it into the canopy. The LI-191R can be used for abso- lute measurements above a canopy, but the LI-190R is preferred for above-canopy radiation measurements.
  • Page 17 Section 2. Using LI-COR Quantum Sensors Multiplier for use with LI-COR handheld meters and loggers LI-COR handheld meters and loggers convert the current (μA) signal into units of radiation (µmol s ) by applying this multiplier, expressed in radiation units per current (µmol s...

  • Page 18: Using The Li-190R-Bnc Or Li-191R-Bnc

    Sensor Logger. These devices directly measure the current (μA) signal from the sensor. Enter the sensor's multiplier (see Multiplier for use with LI-COR handheld meters and loggers on the previous page) into the device to determine PAR expressed in units of µmol s Figure 2-2.

  • Page 19: Using The Li-190R-Bl Quantum Sensor

    To log radiation units (µmol s ), configure the recording device to multiply the μA signal by the sensor's multiplier (see Multiplier for use with LI-190R-BL (3- wire bare leads) on page 2-3) prior to logging the values. If logging the μA sensor sig- nal, apply the multiplier after logging.

  • Page 20: Voltage Signal Options

    (LI-190R-SMV or LI-191R-SMV Quantum Sensor on page 3-2). LI-190R or LI-191R coupled with a 2420 Light Sensor Amplifier. The 2420 Amplifier converts the current (µA) signal from the sensor into a voltage (2420 Light Sensor Amplifier on page 4-1).

  • Page 21: Section 3. Connecting 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 adapater includes a precision resistor and a BNC connector that mates with the sensor.

  • Page 22: Li-190R-Smv Or Li-191R-Smv Quantum Sensor

    LI-190R-SMV or LI-191R-SMV Quantum Sensor The LI-190R-SMV Quantum Sensor or LI-191R-SMV Line Quantum Sensor includes a Standard Output Millivolt Adapter (part number 2319) terminating in bare leads. The serial number on the sensor head must match the serial number on the adapter because the resistance is adjusted to each sensor's current output.
  • Page 23 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-190R or LI-191R with a BNC-type connector can be converted to an SMV- type sensor by attaching a Standard Output Millivolt Adapter (part number 2319) to the BNC connector.
  • Page 24 Section 3. Connecting Millivolt Adapters LI-190R and LI-191R Quantum Sensors...
  • Page 25 The 2420 Light Sensor Amplifier converts the current (μA) signal from the radi- ation 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 26: Section 4. 2420 Light Sensor Amplifier

    2. Example: The amplifier gain determined in step 2 (G = 0.375 V μA ) requires all switches to be in the off position: G = 0.375 all switches off LI-190R and LI-191R Quantum Sensors...
  • Page 27 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 28: 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-190R and LI-191R Quantum Sensors...

  • Page 29: 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 30: Connecting 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 31: 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 32: 2420 Amplifier Performance Characteristics

    0.025 to 0.375 V μA 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 LI-190R and LI-191R Quantum Sensors...

  • Page 33: Section 5. Performance Characteristics

    The LI-190R 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). Errors are typically less than ± 5% for angles less than 82° from the normal axis. At 90°, a perfect cosine response would be zero, and any error at that angle is infinite.
  • Page 34 Section 5. Performance Characteristics Angle of Incidence (Degrees) Figure 5-1. Typical cosine response of the LI-190R Quantum Sensor. Figure 5-2. LI-COR sensor creating the proper cosine response at various angles of incidence. LI-190R and LI-191R Quantum Sensors...

  • Page 35: Li-191R Cosine Response

    Section 5. Performance Characteristics Figure 5-2 on the previous page shows how the design of the sensor creates the proper cosine response. Radiation is received by an acrylic disc called a diffuser, or eye. When radiation strikes with a greater angle of incidence, more is received by the edge of the eye.

  • Page 36: Quantum Spectral Response

    400 nm to 700 nm waveband. This waveband was defined by McCree (1972) producing a photosynthetic response in plants. Figure 5-4 below and Figure 5-5 on the facing page show that the quantum spectral response curve for the LI-190R is close to the ideal quantum response.

  • Page 37: Calibration

    Figure 5-5. Typical LI-190R quantum response and the ideal quantum response displayed in photon units. Calibration Each LI-COR radiation sensor is fully calibrated at the factory, and no user cal- ibration 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.

  • Page 38: Li-191R Line Quantum Sensor Calibration

    National Institute of Standards and Technology (NIST) standard lamps with known photon flux density and irradiance in the 400 nm to 700 nm waveband. LI-190R and LI-191R Quantum Sensors...

  • Page 39: Section 6. Care And Maintenance

    Section 6. Care and Maintenance For best performance and longevity, treat the sensor carefully. The protective cap that came with the LI-190R can be used later when shipping the sensor for factory recalibration. Figure 6-1. LI-190R Quantum Sensor The vertical edge of the acrylic diffuser (see Figure 6-1 above) must be clean to main- tain calibration and correct cosine response.

  • Page 40: 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 41: Sensor Base Cover

    When a sensor base must be left behind while the head is being factory recal- ibrated, protect it by attaching a 2001S Sensor Base Cover, available from LI-COR. Attach using the same screws that held the sensor head to the base.

  • Page 42: Replacement Parts

    (without cables) are available for purchase. Sensor heads can replace damaged heads, or be used as spares. Any cable assembly can be used interchangeably with any LI-190R, LI- 200R, or LI-210R sensor head. Flat head Phillips machine screw, 2-56 threads, 1/2"...

  • Page 43: Section 7. Troubleshooting

    Troubleshooting Sensor readings are negative (-) or zero Check for proper wiring of the LI-190R-BL: (see Using the LI-190R-BL Quantum Sensor on page 2-5), 2290 Millivolt Adapter (see Connecting the 2290 Millivolt Adapter on page 3-2), or LI-190R-SMV (see LI-190R-SMV or LI-191R-SMV Quantum Sensor on page 3-2).
  • Page 44 Section 7. Troubleshooting LI-190R and LI-191R Quantum Sensors...

  • Page 45: Appendix A. Specifications

    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-190R and LI-191R Quantum Sensors...
  • Page 46 Absolute Calibration: ± 10% traceable to the U.S. National Institute of Standards and Technology (NIST). The LI-191R is calibrated via transfer calibration using a reference LI-190R Quantum Sensor. Transfer error is ± 5% (included in the ± 10%) Sensitivity: Typically 7 μA per 1000 µmol s Linearity: Maximum deviation of 1% up to 10,000 µmol s...
  • Page 47 Appendix A. Specifications 2420 BL Dimensions 2420 BNC Dimensions Appendix A. Specifications...
  • Page 48 Appendix A. Specifications LI-190R and LI-191R Quantum Sensors...

  • Page 49: Appendix B. Warranty

    Inc.'s examination discloses to have been defective in material or workmanship without charge and only under the following conditions, which are: The defects are called to the attention of LI-COR, Inc. in Lincoln, Nebraska, in writing within one year after the shipping date of the instrument.
  • Page 50 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 con- sequential damages.
  • Page 51 Appendix C. 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, 2-3, 2-5 2319 Standard Output Millivolt Adapter, 3- Certificate of Calibration, 2-2 Cleaning, 6-1 2420 Light Sensor Amplifier, 4-1 Comparing Sensors, 1-2 performance characteristics, 4-8...
  • Page 52 Voltage Signal Options, 2-6 Meter Compatibility, 1-5 Millivolt Adapters, 3-1 2220 Millivolt Adapter, 3-1 2319 Standard Output Millivolt Adapter, 3-2 Mounting and Levelling Fixture, 2-1 Mounting Sensors, 2-1 Mounting the LI-191R, 2-2 Multipliers, 2-5 for handheld meters, 2-3 LI-190R and LI-191R Quantum Sensors...
  • Page 54 Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/env/distributors...

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