LI-COR LI-250A User manual
Instruction
Manual
LI-250A
LI-250A
Light Meter
Light Meter
®
LI-COR, inc. ●Environmental
4421 Superior Street ●P.O. Box 4425 ●Lincoln, Nebraska 68504
Phone: 402-467-3576 ● FAX: 402-467-2819
Toll-free 1-800-447-3576 (U.S. & Canada)
envsales@licor.com
www.licor.com
®
CE Marking
The LI-250A is a CE-marked product. For conformity
information, contact LI-COR Support at
http://www.licor.com/envsupport. Outside of the U.S.,
contact your local sales office or distributor.
Doc. #53-16006-A
June 30, 2016
LI-1500/LI-1500G Light Sensor Logger/LI-250A Light Meter
Part Name Toxic and Hazardous Substances or Elements
(Pb) (Hg) (Cd) (Cr(VI)) (PBB) (PBDE)
PCBs)
X O O O O O
Cables and Wires)
X O O O O O
(Metal Parts)
X O O O O O
(
Plastic Parts)
O O O O O O
(
Batteries)
O O O O O O
SJ/T 11364
O = GB/T 26572
(indicates that the content of the toxic and hazardous substance in all the Homogeneous
Materials of the part is below the concentration limit requirement as described in
GB/T 26572
).
X = GB/T 26572
(indicates that the content of the toxic and hazardous substance in at least one Homogeneous
Material of the part exceeds the concentration limit requirement as described in
GB/T 26572
).
LI-1500/LI-1500G / LI-250A
LI-250A
Light Meter
Instruction Manual
Publication Number 984-07507
March, 2004
®
LI-COR, Inc.
Environmental
4421 Superior Street
P.O. Box 4425
Lincoln, Nebraska 68504
Phone: (402) 467-3576
FAX: (402) 467-2819
Toll-free 1-800-447-3576 (U.S. & Canada)
www.licor.com
ii
How to Use this Manual
This manual contains operation and maintenance infor-
mation for the LI-250A Light Meter. Read the operating
instructions before using the LI-250A.
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 MER-
CHANTABILITY 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 photocopied, reproduced, or translated to another language
without prior written consent of LI-COR, inc.
Copyright 2004, LI-COR, inc.
1st Printing - March, 2004
iii
Table of Contents
Section 1. Operation Summary
1.1 Configuration vs. Measurement Mode..................... 5
1.2 Making Measurements ............................................. 5
Section 2. Sensors & Accessories
2.1 Compatible Sensors ................................................. 9
2.2 Sensor Calibration.................................................... 10
2.3 Accessories .............................................................. 13
2.4 Power Requirements ................................................ 13
APPENDIX A. Specifications
APPENDIX B. Conversion Table
5
1Operation Summary
Read this section to configure and operate the LI-250A.
Note that abbreviated programming instructions can also be
found on the LI-250A back panel.
1.1 Configuration vs. Measurement
Mode
The LI-250A has two modes of operation; Configuration
and Measurement mode. In configuration mode, you can
enter calibration multipliers for two different light sensors,
or enter two multipliers for the same sensor. For example,
you might enter a multiplier that applies to measurements
under water and one that applies to measurements in air for
an LI-192SA Underwater Quantum Sensor. In measure-
ment mode the LI-250A makes continuous measurements
until either the HOLD key or the CAL key is pressed.
1.2 Making Measurements
The LI-250A utilizes a 5-key keypad; note that many of the
keys have two functions. The active function depends on
whether the LI-250A is in Measurement or Configuration
mode. In measurement mode, the keys perform the
function shown in green; in configuration mode, the keys
perform the function shown in white.
Operation Summary
6
1. Attach the desired sensor.
2. Press and hold the ON key for about 2 seconds, and
then release to turn the instrument on. You will be in
measurement mode.
3Press CAL to enter configuration mode, where you can
display or change the calibration multiplier currently
in use. The display will show CAL.
4. Press UNITS until the units label on the display
matches the sensor type. Readings will be incorrect if
the Units Label does not match the sensor type.
Sensor Type Units Label Readout Units
Quantum
Pyranometer
Photometric
µmol
W m-2
lux or Klux
µmol s-1 m-2
Watts m-2
lux or Kilolux
5. Press the ↑or ↓keys to change the displayed
multiplier value. Press and hold the arrow keys down
to scroll the values rapidly.
Important Note: Measurement units must
match the sensor type; no unit conversions are
performed.
6. Press CAL again to store the displayed multiplier value
and units label and use them to take measurements; or
7. Press MULT SELECT if you wish to display the second
multiplier. NOTE: Pressing MULT SELECT before
Operation Summary
7
pressing CAL (step 6) discards any changes you have
made to the multiplier currently shown on the display.
8. Edit the second multiplier following steps 5-7 above.
9. Press CAL again to store the displayed multiplier value
and units label and use them to take measurements.
Note that pressing CAL when in measurement mode will
display the multiplier in current use. The multiplier dis-
played when CAL is pressed again will be stored as the
active multiplier, whether you have changed it or not.
While in measurement mode, you can press HOLD to retain
the current reading on the display, until the HOLD key is
pressed again.
Press AVG to perform a 15 second average, which will be
displayed in Hold mode. Press the HOLD key to resume
measurements.
Press the OFF key to turn the power off. The LI-250A will
automatically shut off after 25 minutes of inactivity in
measurement mode.
Operation Summary
8
Precaution
The LI-250A is environmentally sealed. However, please
use appropriate precautions to protect the meter from
immersion or prolonged contact with water, especially in
marine environments. Water damage is not covered under
the LI-250A warranty.
9
2 Sensors & Accessories
2.1 Compatible Sensors
The LI-250A is compatible with all LI-COR type 'SA'
radiation sensors. It is important that the LI-250A be
properly configured for the specific sensor used. A
quantum sensor must be used to make measurements of
photosynthetically active radiation (µmol s-1 m-2 of PAR),
a pyranometer for measurements of solar radiation (W m-2),
and a photometric sensor for measurements of illuminance
(lux). For example, it is not possible for a pyranometer to
read out in units of lux. If you want to configure the LI-
250A to read out in lux, you must use the photometric
sensor.
LI-COR type 'SB' radiation sensors are also compatible if
the Calconnector (Calibration connector) is detached from
the BNC connector.
LI-COR type 'SZ' radiation sensors are not compatible with
the LI-250A; they may, however, be fitted with a BNC con-
nector. Contact LI-COR for further information.
Recalibration of all LI-COR radiation sensors is rec-
ommended every two years.
Complete information concerning the sensors that can be
used with the LI-250A is found in the type 'SA' LI-COR
Radiation Sensors instruction manuals. In addition, several
technical reports on LI-COR sensors are available. These
include a report entitled "Radiation Measurements", which
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