LI-COR LI-190R User manual

Terrestrial
Quantum Sensors
Instruction Manual
LI-190R Quantum Sensor
LI-191R Line Quantum Sensor

Terrestrial Quantum Sensors
Instruction Manual
LI-COR Biosciences
4647 Superior Street
Lincoln, Nebraska 68504
Phone: [phone]
Toll free: 800-447-3576 (U.S. and Canada)
[e-mail]
Regional Offices
LI-COR Biosciences GmbH
Siemensstraße 25A
61352 Bad Homburg
Germany
Phone: [phone]
[e-mail]
LI-COR Biosciences UK Ltd.
St. John’s Innovation Centre
Cowley Road
Cambridge
CB4 0WS
United Kingdom
Phone: [phone]
[e-mail]
LI-COR Distributor Network:
www.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 connection 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.
© Copyright 2015, LI-COR, Inc.
CE Marking:
This product is a CE-marked product. For conformity information, contact LI-COR Support at [e-mail].
Outside of the U.S., contact your local sales office or distributor.
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
Publication Number: 984-15211
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
Number
Publication Date Changes
1 April 2015 First Edition
2 May 2015 Second Edition; Edited Troubleshooting section; Added quantum
response graphs; Corrected LI-191R weight and dimensions in
specifications.
3 July 2015 Added specifications for operating temperature and relative
humidity range.
4 November 2015 Removed specification for relative humidity range; Corrected wire
positioning in photo that shows how to connect a sensor to the
2420-BL Light Sensor Amplifier.
Build Date: Tuesday, April 17, 2018
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 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. #53-15084 March 23, 2015
LI-190R-BL-x; LI-190R-BNC-x (x = 2, 5, 15, 50)
LI-190R-BL-x; LI-190R-BNC-x (x = 2, 5, 15, 50)
Quantum Sensor Head Assembly
Base and Cable Assembly
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 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. #53-15085 March 23, 2015
LI-190R-SMV-x (x = 2, 5, 15, 50)
LI-190R-SMV-x (x = 2, 5, 15, 50)
Quantum 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 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.
X: o( ,
"X" o)
O: o
Doc. #53-15073-B
May 4, 2015
LI-191R-BNC-x (x = 2, 5)
LI-191R-BNC-x (x = 2, 5)
X O O O O O
X O O O O O
Line Quantum Sensor Head Assembly
Cable Assembly
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.
o
X: ( ,
"X" o)
O: o
Doc. #53-15192-A
May 4, 2015
LI-191R-SMV-x (x = 2, 5)
LI-191R-SMV-x (x = 2, 5)
Line Quantum Sensor Head Assembly
Cable Assembly
X O O O O O
X O O O O O
X O O O O O
Millivolt Adapter Assembly
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 for the LI-190R 1-3
Cable Options for the LI-191R 1-4
Accessories 1-4
Configurations 1-5
Section 2. Using LI-COR Quantum Sensors
Mounting the LI-190R Quantum Sensor 2-1
Mounting the LI-191R Line Quantum Sensor 2-2
Calibration Constants and Multipliers 2-2
Using the LI-190R-BNC or LI-191R-BNC 2-4
Using the LI-190R-BL Quantum Sensor 2-5
Voltage Signal Options 2-6
Section 3. Connecting Millivolt Adapters
2290 Millivolt Adapter 3-1
LI-190R-SMV or LI-191R-SMV Quantum Sensor 3-2
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 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
LI-190R Cosine Response 5-1
LI-191R Cosine Response 5-3
Quantum Spectral Response 5-4
Calibration 5-5
LI-190R Quantum Sensor Calibration 5-5
LI-191R Line Quantum Sensor Calibration 5-6
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
LI-190R Replacement Parts 6-4
LI-191R Replacement Parts 6-4
Section 7. Troubleshooting
Sensor readings are negative (-) or zero 7-1
Sensor readings are incorrect 7-1
Appendix A. Specifications
Appendix B. Warranty
Appendix C. Index
vi

Section 1.
General Information
This manual provides basic operating instructions for the
LI-190R Quantum Sensor (right) and the LI-191R Line
Quantum Sensor and their accessories. LI-COR quantum
sensors measure photosynthetically active radiation (PAR)
with an enhanced silicon photodiode mounted under a cosine-
corrected acrylic diffuser. A custom spectral filter helps achieve
the desired spectral response.
The sensor output is a current (μA) signal that is directly proportional to hemi-
spherical PAR. A multiplier is used to convert the current signal into units of radi-
ation (µmol s-1 m-2).
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. The LI-191R spatially averages incident radiation over the 1-meter length
of the diffuser, minimizing errors introduced by shadows and sunflecks. The incid-
ent radiation passes through the diffuser and is directed uniformly to a single sil-
icon photodiode.
1-1LI-190R and LI-191R Quantum Sensors

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-190R and LI-191R Quantum Sensors

Cable Options for the LI-190R
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). For
sensors with a BNC connector, the body of the connector carries a positive signal
and is connected to the shield of the cable, while the center conductor is negative.
This arrangement reduces electronic interference.
Figure 1-3. Sensor Terminal Types.
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 for the LI-190R

Section 1. General Information
Cable Options for the LI-191R
The cable for an LI-191R Line Quantum Sensor terminates with a BNC connector
on each end. One end connects to the sensor and the other end connects to the log-
ger, meter, or millivolt adapter. 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:
l2290 Millivolt Adapter. 604 Ω resistance (2290 Millivolt Adapter on page3-1)
l2420 Light Sensor Amplifier (2420 Light Sensor Amplifier on page4-1)
Additional accessories for use with the LI-190R:
l2003S Mounting and Leveling Fixture. Anodized aluminum with stainless
steel leveling screws and a weatherproof spirit level
l2001S Sensor Base Cover. Anodized aluminum
1-4 LI-190R and LI-191R Quantum Sensors

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.
Sensor Termination Type... ...connects to...
LI-190R-BNC or LI-191R-BNC lLI-1500 Light Sensor Logger
lLI-1400 Datalogger
lLI-250A Light Meter
LI-190R-BL (bare leads) 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-190R-BNC or LI-191R-
BNC
2290 mV Adapter
(0 to 10 mV output)
Devices that read a voltage
signal with good resolution (in
the µV range)
LI-190R-SMV or LI-191R-SMV Include a standard
output mV adapter (part number 2319) with 10 mV
output at full scale
LI-190R-BL Precision resistor
LI-190R-BNC or LI-191R-
BNC
2420-BNC Amplifier
(-2.5 to 5.0 V output)
Devices that read a voltage
signal
LI-190R-BL 2420-BL Amplifier
(-2.5 to 5.0 V output)
Table 1-3. Configurations for a voltage signal. Ultimate termination is bare leads.
Section 1. General Information
1-5Configurations

Section 1. General Information
1-6 LI-190R and LI-191R Quantum Sensors

Section 2.
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. 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-190R Quantum Sensor mounted in the 2003S Mounting and Leveling Fix-
ture.
2-1LI-190R and LI-191R Quantum Sensors

Section 2. Using LI-COR Quantum Sensors
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.
Mounting the LI-191R Line Quantum Sensor
The LI-191R can be hand held or mounted to an instrument platform. The sensor
should be level as much as possible when in use. Error induced by inexact leveling
is usually very small compared to the other sources of error. Therefore, slightly out-
of-level mounting may be preferred to prevent water from pooling on the diffuser.
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.
The sensor is sealed against moisture, except for the BNC connector. Nevertheless,
mount the sensor so that water does not pool on the acrylic diffuser. The LI-191R
should not be submerged in water.
An anodized aluminum cone is provided with the LI-191R. It is used to ease inser-
tion into plant canopies or dense vegetation. It threads into the tip of the sensor.
Caution: Do not drop the LI-191R. It could be damaged in a drop and the point
of the nose cone could cause injury.
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
number 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 LI-COR quantum sensor is related to radiation
intensity with a calibration constant unique to each sensor, expressed in units of µA
per 1000 µmol s-1 m-2. The calibration constant is used to compute calibration mul-
tipliers.
2-2 LI-190R and LI-191R 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-1 m-2) by applying this multiplier, expressed in radiation units
per current (µmol s-1 m-2 µA-1). This multiplier is a negative number.
Multiplier for use with LI-190R-BL (3-wire bare leads)
This multiplier is expressed in radiation units per current (µmol s-1 m-2 µA-1) and
is a positive number.
Multiplier for use with LI-COR 2290 (604Ω) Millivolt
Adapter
This multiplier is expressed in radiation units per voltage (µmol s-1 m-2 mV-1) and
is a negative number.
Multiplier for use with SMV quantum sensors
The final multiplier listed is -200.0 µmol s-1 m-2 mV-1. The multiplier is the same
for any LI-190R-SMV Quantum Sensor or LI-191R-SMV Line Quantum Sensor
because the resistance of the included standard output millivolt adapter (part num-
ber 2319) is adjusted to each sensor's current output.
Section 2. Using LI-COR Quantum Sensors
2-3Calibration Constants and Multipliers

Section 2. Using LI-COR Quantum Sensors
Using the LI-190R-BNC or LI-191R-BNC
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 PAR expressed in
units of µmol s-1 m-2.
Figure 2-2. LI-190R-BNC Quantum Sensor.
Figure 2-3. LI-191R-BNC Line Quantum Sensor.
2-4 LI-190R and LI-191R Quantum Sensors

Using the LI-190R-BL Quantum Sensor
Figure 2-4. LI-190R-BL Quantum Sensor 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.
Blue: Positive Signal (+)
Brown: Negative Signal (-)
Bare: Shield (Ground)
To log radiation units (µmol s-1 m-2), 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.
The LI-190R-BL can be used with recording devices that require a voltage (mV) sig-
nal by adding a precision resistor (see Voltage Signal Options on the next page).
Section 2. Using LI-COR Quantum Sensors
2-5Using the LI-190R-BL Quantum Sensor

Section 2. Using LI-COR Quantum Sensors
Voltage Signal Options
If the meter or logging device requires a voltage signal, options include:
lLI-190R-BNC or LI-191R-BNC coupled with a 2290 Millivolt Adapter. The
2290 Millivolt Adapter includes a precision resistor that converts the current
(µA) signal from the sensor into a millivolt-level voltage (2290 Millivolt Adapter
on page3-1).
lLI-190R-SMV Quantum Sensor or LI-191R-SMV Line Quantum Sensor. An
SMV-type quantum sensor includes a Standardized Millivolt Adapter (part num-
ber 2319) matched to a particular sensor. The serial numbers on the adapter
and the sensor must match! The advantage over the 2290 Millivolt Adapter is
that the multiplier in your device does not need to be changed for different
sensors (LI-190R-SMV or LI-191R-SMV Quantum Sensor on page3-2).
lLI-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).
lLI-190R-BL coupled with a precision resistor. Connect the resistor across the
positive and negative leads of the cable. The recommended resistance is 604 Ω,
with a maximum output of approximately 10 mV per 2000 µmol s-1 m-2. See
2290 Millivolt Adapter on page3-1 for instructions on calculating the mul-
tiplier, 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.
2-6 LI-190R and LI-191R Quantum Sensors