LI-COR LI-200R User manual

LI-200R
Pyranometer
Instruction Manual

LI-200R Pyranometer
Instruction Manual
LI-COR Environmental
4647 Superior Street
Lincoln, Nebraska 68504
Phone: [phone]
Toll free: 800-447-3576 (U.S. & Canada)
[email protected]
[email protected]
licor.com/env
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61352 Bad Homburg
Germany
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LI-COR Ltd., United Kingdom
St. John’s Innovation Centre
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Cambridge
CB4 0WS
United Kingdom
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Beijing LI-COR Bioscience Ltd.
Room 502-503, 5th Floor, Jimen No.1 Office Building
Xitucheng Road, Haidian District
Beijing, China
Phone: [phone]
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LI-COR Distributor Network
licor.com/env/distributors

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 con-
nection with the furnishing, performance, or use of this material.
This document contains proprietary information which is protected by copyright. All rights are reserved. No part of this
document may be may be reproduced or translated into another language with prior written consent of LI-COR, Inc.
All other trademarks or registered trademarks are property of their respective owners.
CE Marking:
This product is a CE marked product. For conformity information, (typically EMC, Safety, RoHS, and/or Wireless) contact
LI-COR Support at [email protected] for a Declaration of Conformity. Outside the U.S., contact your local sales office
or distributor.
For ReaCH (Regulation (EC) n.1907/2006) related questions, information is available on the European Chemicals Agency
maintained website for the 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,
Energy Star, EU GPP, or other similar regulations. The typical scope for these regulations is lighting, furniture, copiers,
mobile phones, televisions, computer/servers, home appliances, to name a few. As such, our products do not use any
labeling that indicates adherence thereof.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device
may not cause harmful interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation.
Printing History
© Copyright 2015, LI-COR, Inc.
Publication Number: 984-15210
Build Date: Wednesday, October 25, 2023
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.
Version Date Changes
1 04/2015 First Edition
2 05/2015 Second Edition; Edited Troubleshooting section.
3 07/2015 Added specifications for operating temperature and relative humidity range;
Updated sensitivity specification.
4 11/2015 Removed specification for relative humidity range. Corrected wire positioning
in the photo that shows how to connect a sensor to the 2420-BL Light Sensor
Amplifier.
ii

iii
Lead (Pb) Mercury (Hg) Cadmium (Cd)
Chromium VI
Compounds
(Cr6+)
Polybrominated
Biphenyls
(PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
(Pb) (Hg) (Cd) (Cr6+) (PBB) (PBDE)
X O O O O O
X: this component does contain this hazardous substance above the maximum concentration values in homogeneous materials
specified in the SJ/T 11363-2006 Industry Standard (Company can explain the technical reasons for the "X")
Hazardous Substances or Elements
Component Name
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.
,(6002-36311T/JS:X
)"X"
6002-36311T/JS:O o
Doc. #53-14982 March 23, 2015
LI-200R-BL-x; LI-200R-BNC-x (x = 2, 5, 15, 50)
LI-200R-BL-x; LI-200R-BNC-x (x = 2, 5, 15, 50)
Pyranometer Sensor Head Assembly
Base and Cable Assembly
X O O O O O
X O O O O O
X O O O O O
强
Lead (Pb) Mercury (Hg) Cadmium (Cd)
Chromium VI
Compounds
(Cr6+)
Polybrominated
Biphenyls
(PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
(Pb) (Hg) (Cd) (Cr6+) (PBB) (PBDE)
X O O O O O
X O O O O O
X O O O O O
X: this component does contain this hazardous substance above the maximum concentration values in homogeneous materials
specified in the SJ/T 11363-2006 Industry Standard (Company can explain the technical reasons for the "X")
Hazardous Substances or Elements
Component Name
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.
,(6002-36311T/JS:X
)"X"
6002-36311T/JS:O
Doc. #53-15083 March 23, 2015
LI-200R-SMV-x (x = 2, 5, 15, 50)
LI-200R-SMV-x (x = 2, 5, 15, 50)
Pyranometer Sensor Head Assembly
Millivolt Adapter Assembly
Base and Cable Assembly
X O O O O O
X O O O O O
X O O O O O
Lead (Pb) Mercury (Hg) Cadmium (Cd)
Chromium VI
Compounds
(Cr6+)
Polybrominated
Biphenyls
(PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
(Pb) (Hg) (Cd) (Cr6+) (PBB) (PBDE)
X O O O O O
X: this component does contain this hazardous substance above the maximum concentration values in homogeneous materials
specified in the SJ/T 11363-2006 Industry Standard (Company can explain the technical reasons for the "X")
Hazardous Substances or Elements
Component Name
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.
,(6002-36311T/JS:X
"X" o
6002-36311T/JS:O o
Doc. #53-14832 March 23, 2015
2420-BL
2420-BL
Amplifier Bare Lead Assembly X O O O O O
Lead (Pb) Mercury (Hg) Cadmium (Cd)
Chromium VI
Compounds
(Cr6+)
Polybrominated
Biphenyls
(PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
(Pb) (Hg) (Cd) (Cr6+) (PBB) (PBDE)
X O O O O O
X: this component does contain this hazardous substance above the maximum concentration values in homogeneous materials
specified in the SJ/T 11363-2006 Industry Standard (Company can explain the technical reasons for the "X")
Hazardous Substances or Elements
Component Name
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.
,(6002-36311T/JS:X
"X" o
6002-36311T/JS:O o
Doc. #53-14833 March 23, 2015
2420-BNC
2420-BNC
Amplifier BNC Assembly X O O O O O

iv

v
Contents
Section 1. General Information
Comparing LI-COR Radiation Sensors 1-2
Cable Options 1-3
Accessories 1-4
Configurations 1-4
Section 2. Using the LI-200R Pyranometer
Mounting 2-1
Calibration Constants and Multipliers 2-2
Using the LI-200R-BNC Pyranometer 2-3
Using the LI-200R-BL Pyranometer 2-3
Voltage Signal Options 2-4
Section 3. Millivolt Adapters
2220 Millivolt Adapter 3-1
LI-200R-SMV Pyranometer 3-3
Section 4. 2420 Light Sensor Amplifier
2420 Amplifier Gain Settings 4-2
Connecting to a Data Logger 4-4
Differential Wiring 4-5
Single-ended Wiring 4-5
Connecting to a Sensor 4-6
Equation Summary 4-7
Output Voltage 4-7
Ideal Gain 4-7
Voltage Multiplier 4-7
2420 Amplifier Performance Characteristics 4-8
Section 5. Performance Characteristics

Cosine Correction 5-1
Spectral Response 5-3
Calibration 5-5
Section 6. Care and Maintenance
Factory Recalibration 6-2
Removing a Cable 6-2
Sensor Base Cover 6-3
Installing a Cable 6-3
Replacement Parts 6-4
Section 7. Troubleshooting
Appendix A. Specifications
Standard Terms and Conditions
Index
vi

Section 1.
General Information
This manual provides basic operating instructions for the
LI-200R Pyranometer and its accessories. The LI-200R
measures global solar radiation (solar irradiance received
on a horizontal surface) with a silicon photodiode moun-
ted under a cosine-corrected acrylic diffuser. The sensor
output is a current (μA) signal that is directly pro-
portional to hemispherical solar radiation. A multiplier is
used to convert the current signal into units of radiation
(W m-2).
Typical applications for the LI-200R include solar energy, meteorology, agriculture,
and environmental research.
Important Note: The LI-200R should only be used to measure unobstructed day-
light. Measurements under vegetation, cloud cover, artificial lights, in a green-
house, 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 on page5-4).
Therefore, it must be used under lighting conditions that are the same as those
under which it was calibrated.
1-1LI-200R Pyranometer

Section 1. General Information
Comparing LI-COR Radiation Sensors
Each LI-COR radiation sensor is optimized for a particular application and meas-
urement type (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.
Sensor Measurement Units Waveband
LI-190R Quantum Sensor Photosynthetically
active radiation
(PAR)
μmol s-1 m-2 400 to 700 nm
LI-191R Line Quantum Sensor
LI-192SA Underwater Quantum
Sensor
LI-193SA Underwater Spherical
Quantum Sensor
LI-200R Pyranometer Global solar
radiation
W m-2 400 to 1100
nm
LI-210R Photometric Sensor Light as perceived
by the human eye
Lux or klux 450 to 650 nm
Table 1-1. LI-COR radiation sensors.
Figure 1-1. LI-COR radiation sensors.
1-2 LI-200R Pyranometer

Cable Options
The detachable base and cable assembly provides benefits including:
lReduced cost of cable repairs
lThe ability to replace or recalibrate a light sensor without removing the cable
from the mounting structure
lCable 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).
For sensors with a BNC connector, the body of the connector carries a positive sig-
nal and is connected to the shield of the cable, while the center conductor is neg-
ative. This arrangement reduces electronic interference.
Figure 1-3. Sensor terminals are either a BNCconnector or bare leads.
BNC or bare leads (BL) terminal types are available with cable lengths of 2, 5, 15, or
50 meters.
Calibrated LI-190R, LI-200R, or LI-210R sensor heads
(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.
Section 1. General Information
1-3Cable Options

Section 1. General Information
Accessories
These optional accessories are available for use with the LI-200R Pyranometer:
l2220 Millivolt Adapter, 147 Ω resistance (2220 Millivolt Adapter on page3-1)
l2420 Light Sensor Amplifier (2420 Light Sensor Amplifier on page4-1)
l2003S Mounting and Leveling Fixture. Anodized aluminum with stainless
steel leveling screws and a weatherproof spirit level
l2001S 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.
Sensor Termination Type... ...connects to...
LI-200R-BNC lLI-1500 Light Sensor Logger
lLI-1400 Datalogger
lLI-250A Light Meter
LI-200R-BL lTerminal block of the LI-1400 Datalogger
lNon-LI-COR devices that read a current (μA)
signal
Table 1-2. Configurations for a current (µA) signal. Ultimate termination is BNC or
bare leads.
Sensor Termination... ...coupled with... ...connects to...
LI-200R-BNC 2220 mV Adapter
(0 to 10 mV output)
Devices that read a voltage
signal with good resolution
(in the µV range)
LI-200R-SMV Includes a standard output mV adapter
with 10 mV output at full scale (part number 2320)
LI-200R-BL Precision resistor
LI-200R-BNC 2420-BNC Amplifier
(-2.5 to 5.0 V output)
Devices that read a voltage
signal
LI-200R-BL 2420-BL Amplifier
(-2.5 to 5.0 V output)
Table 1-3. Configurations for a voltage signal. Ultimate termination is bare leads.
1-4 LI-200R Pyranometer

Section 2.
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. Level the fixture with the bubble by adjusting the three leveling screws.
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.
Secure cables to the instrument platform using cable ties. Be sure there is no strain
on the junction where the cable enters the sensor housing, and use a cable tie at any
sharp bends in the cable.
2-1LI-200R Pyranometer

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
on the certificate in the following order:
Calibration constant
The current signal produced by a sensor is related to radiation intensity with a cal-
ibration constant unique to each pyranometer, expressed in units of µA per 1000 W
m-2. The calibration constant is used to compute calibration multipliers.
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 (W m-2) by applying this multiplier, expressed in radiation units per cur-
rent (W m-2 µA-1). This multiplier is a negative number.
Multiplier for use with LI-200R-BL (3-wire bare leads)
This multiplier is expressed in radiation units per current (W m-2 µA-1) and is a pos-
itive number.
Multiplier for use with LI-COR 2220 (147Ω) Milllivolt Adapter
This multiplier is expressed in radiation units per voltage (W m-2 mV-1) and is a neg-
ative number.
Multiplier for use with the SMV Pyranometer
The final multiplier listed is -100.0 W m-2 mV-1. The multiplier is the same for any
LI-200R-SMV Pyranometer because the resistance of the included standard output
millivolt adapter (part number 2320) is adjusted to each sensor's current output (LI-
200R-SMV Pyranometer on page3-3). The LI-200R-SMV replaces the LI-200SL and
uses the same millivolt adapter and multiplier.
2-2 LI-200R Pyranometer

Using the LI-200R-BNC Pyranometer
Connect the BNC-type cable directly to a BNC input port
on an LI-250A Light Meter, LI-1400 Datalogger, or LI-
1500 Light 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 global solar radiation expressed in
units of W m-2.
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. Connecting the
bare (shield) wire to ground will reduce noise in the sensor signal.
Section 2. Using the LI-200R Pyranometer
2-3Using the LI-200R-BNC Pyranometer

Section 2. Using the LI-200R Pyranometer
To log radiation units (W m-2), configure the recording device to multiply the μA
signal by the sensor's multiplier (see Multiplier for use with LI-200R-BL (3-wire bare
leads) on page2-2) prior to logging the values. 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).
Voltage Signal Options
If the meter or logging device requires a voltage signal, options include:
lLI-200R-BNC coupled with a 2220 Millivolt Adapter. The 2220 Millivolt
Adapter converts the current (µA) signal from the sensor into a millivolt-level
voltage (Millivolt Adapters on page3-1).
lLI-200R-SMV Pyranometer. The LI-200R-SMV includes a Standardized Mil-
livolt Adapter (part number 2320) matched to a particular sensor. The serial
numbers on the adapter and the sensor must match! The advantage over the
2220 Millivolt Adapter is that the multiplier in your device does not need to be
changed for different sensors (LI-200R-SMV Pyranometer on page3-3).
lLI-200R coupled with a 2420 Light Sensor Amplifier. The 2420 Amplifier con-
verts the current (µA) signal from the sensor into a voltage (2420 Light Sensor
Amplifier on page4-1).
lLI-200R-BL coupled with a precision resistor. Connect the resistor across the
positive and negative leads of the cable. The recommended resistance is 147 Ω,
with a maximum output of approximately 10 mV per 1000 W m-2. See Millivolt
Adapters on page3-1 for instructions on calculating the multiplier, but use the
absolute value of the multiplier.
With a Millivolt Adapter or other resistor, the signal to noise ratio (sensitivity) is
lower than with the 2420 Light Sensor Amplifier, but the cost is less and there is no
need for a power supply to the adapter.
Caution: Do not attach the sensor to a power source. The sensor is self-powered.
2-4 LI-200R Pyranometer

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. Bare leads can be
connected to a data logger or other device that reads a voltage signal.
The maximum output of LI-COR radiation sensors in typical conditions is relatively
small (microamps of current) and converts into a small voltage. To monitor these
sensors with expected accuracy, a data logger needs to have the ability to measure in
the microvolt range. To increase sensitivity, make sure the voltage range of the chan-
nel is set as close as possible to the full-scale range of the sensor. For example, 0 to
25 mV should cover the range of values expected in a natural sunlight environment.
If the data logger does not have the ability to measure microvolt signals or the abil-
ity to set channel voltage ranges down to a 0–25 mV level, another option should be
considered, such as the 2420 Light Sensor Amplifier.
2220 Millivolt Adapter
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-2) by applying the appro-
priate multiplier, given on the
3-1LI-200R Pyranometer

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 Mfor use with a millivolt adapter can also be found by:
3-1
The 2220 Millivolt Adapter includes a precision resistor with a fixed resistance of
147 Ω, tolerance of ± 0.1%, and a fixed gain of G= 0.147 mV μA-1. The sensor's cal-
ibration constant Cis found on the certificate of calibration (see Calibration constant
on page2-2). The calculated multiplier will be a negative number (because the
shield of the coaxial cable of the sensor carries the positive signal) and is expressed in
units of W m-2 mV-1.
Example: Calculate Musing G= 0.147 mV μA-1 and C= 93.75 μA per 1000 W m-2
3-2
Connecting the 2220 Millivolt Adapter
If the data logger or recorder being used with this millivolt adapter has bipolar cap-
ability, connect the positive (green) lead to the common (low) terminal, and connect
the negative (blue) lead to signal (high) input. This will help minimize noise.
If the data logger has high, low, and ground terminals, place a jumper wire between
the common (low) and ground terminals.
If bipolar signal capability is not available, connect the positive (green) lead to the
signal input, and the negative (blue) lead to the common terminal. In this case, use
the absolute value of the multiplier.
3-2 LI-200R Pyranometer

LI-200R-SMV Pyranometer
The LI-200R-SMV Pyranometer includes a Standard Output Millivolt Adapter (part
number 2320) terminating in bare leads. The serial number on the pyranometer
head must match the serial number on the adapter because the resistance is adjusted
to each sensor's current output. This allows a standardized output of 10 mV per
1000 W m-2. The multiplier used to convert the voltage measured by the data logger
into a light intensity is -100.0 W m-2 mV-1 (also listed on the sensor's certificate of
calibration).
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.
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. The 2320 adapter must be matched to the individual sensor. LI-
COR needs the sensor's serial number in order to adjust an adapter to match the
sensor.
Connecting the LI-200R-SMV Pyranometer
If your data logger or recorder has bipolar signal capability, connect the positive
(red) lead to the common (low) terminal, and connect the negative (black) lead to
signal (high) input. This will help minimize noise in the signal.
If the data logger has high, low, and ground terminals, place a jumper wire between
the common (low) and ground terminals.
Section 3. Millivolt Adapters
3-3LI-200R-SMV Pyranometer

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.
3-4 LI-200R Pyranometer